From 8de82b6eb045d66dc8f0c4d54a7bbe7f144a05cc Mon Sep 17 00:00:00 2001 From: Stella Lau Date: Wed, 12 Jul 2017 16:31:31 -0700 Subject: [PATCH] [ldm] Clean up versions --- contrib/long_distance_matching/ldm.c | 5 +- contrib/long_distance_matching/util.c | 1 - .../versions/v0.1/ldm.c | 394 ---------- .../versions/v0.1/ldm.h | 19 - .../versions/v0.1/main-ldm.c | 459 ----------- .../versions/v0.2/Makefile | 32 - .../versions/v0.2/ldm.c | 436 ----------- .../versions/v0.2/ldm.h | 19 - .../versions/v0.2/main-ldm.c | 474 ------------ .../versions/v0.3/Makefile | 10 - .../versions/v0.3/README | 3 + .../versions/v0.4/Makefile | 40 - .../versions/v0.4/ldm.c | 729 ------------------ .../versions/v0.4/ldm.h | 22 - .../versions/v0.4/main-ldm.c | 480 ------------ .../versions/v0.4/util.c | 69 -- .../versions/v0.4/util.h | 25 - .../versions/v0.5/Makefile | 15 +- .../versions/v0.5/README | 5 + .../versions/v0.5/ldm.c | 8 +- 20 files changed, 15 insertions(+), 3230 deletions(-) delete mode 100644 contrib/long_distance_matching/versions/v0.1/ldm.c delete mode 100644 contrib/long_distance_matching/versions/v0.1/ldm.h delete mode 100644 contrib/long_distance_matching/versions/v0.1/main-ldm.c delete mode 100644 contrib/long_distance_matching/versions/v0.2/Makefile delete mode 100644 contrib/long_distance_matching/versions/v0.2/ldm.c delete mode 100644 contrib/long_distance_matching/versions/v0.2/ldm.h delete mode 100644 contrib/long_distance_matching/versions/v0.2/main-ldm.c create mode 100644 contrib/long_distance_matching/versions/v0.3/README delete mode 100644 contrib/long_distance_matching/versions/v0.4/Makefile delete mode 100644 contrib/long_distance_matching/versions/v0.4/ldm.c delete mode 100644 contrib/long_distance_matching/versions/v0.4/ldm.h delete mode 100644 contrib/long_distance_matching/versions/v0.4/main-ldm.c delete mode 100644 contrib/long_distance_matching/versions/v0.4/util.c delete mode 100644 contrib/long_distance_matching/versions/v0.4/util.h create mode 100644 contrib/long_distance_matching/versions/v0.5/README diff --git a/contrib/long_distance_matching/ldm.c b/contrib/long_distance_matching/ldm.c index b17a0f15..87645b76 100644 --- a/contrib/long_distance_matching/ldm.c +++ b/contrib/long_distance_matching/ldm.c @@ -19,8 +19,8 @@ #define WINDOW_SIZE (1 << 20) //These should be multiples of four. -#define LDM_HASH_LENGTH 100 -#define MINMATCH 100 +#define LDM_HASH_LENGTH 4 +#define MINMATCH 4 #define ML_BITS 4 #define ML_MASK ((1U<iend = dctx->ip + dctx->compressSize; dctx->op = dst; dctx->oend = dctx->op + dctx->maxDecompressSize; - } size_t LDM_decompress(const void *src, size_t compressSize, diff --git a/contrib/long_distance_matching/util.c b/contrib/long_distance_matching/util.c index 70fcbc2c..47ac8a12 100644 --- a/contrib/long_distance_matching/util.c +++ b/contrib/long_distance_matching/util.c @@ -66,4 +66,3 @@ BYTE LDM_readByte(const void *memPtr) { memcpy(&val, memPtr, 1); return val; } - diff --git a/contrib/long_distance_matching/versions/v0.1/ldm.c b/contrib/long_distance_matching/versions/v0.1/ldm.c deleted file mode 100644 index 266425f8..00000000 --- a/contrib/long_distance_matching/versions/v0.1/ldm.c +++ /dev/null @@ -1,394 +0,0 @@ -#include -#include -#include -#include - -#include "ldm.h" - -#define LDM_MEMORY_USAGE 14 -#define LDM_HASHLOG (LDM_MEMORY_USAGE-2) -#define LDM_HASHTABLESIZE (1 << (LDM_MEMORY_USAGE)) -#define LDM_HASHTABLESIZE_U32 ((LDM_HASHTABLESIZE) >> 2) -#define LDM_HASH_SIZE_U32 (1 << (LDM_HASHLOG)) - -#define WINDOW_SIZE (1 << 20) -#define MAX_WINDOW_SIZE 31 -#define HASH_SIZE 4 -#define MINMATCH 4 - -#define ML_BITS 4 -#define ML_MASK ((1U<>8); - } -} - -static U32 LDM_read32(const void *ptr) { - return *(const U32 *)ptr; -} - -static U64 LDM_read64(const void *ptr) { - return *(const U64 *)ptr; -} - - -static void LDM_copy8(void *dst, const void *src) { - memcpy(dst, src, 8); -} - -static void LDM_wild_copy(void *dstPtr, const void *srcPtr, void *dstEnd) { - BYTE *d = (BYTE *)dstPtr; - const BYTE *s = (const BYTE *)srcPtr; - BYTE * const e = (BYTE *)dstEnd; - - do { - LDM_copy8(d, s); - d += 8; - s += 8; - } while (d < e); - -} - -struct hash_entry { - U64 offset; - tag t; -}; - -static U32 LDM_hash(U32 sequence) { - return ((sequence * 2654435761U) >> ((32)-LDM_HASHLOG)); -} - -static U32 LDM_hash5(U64 sequence) { - static const U64 prime5bytes = 889523592379ULL; - static const U64 prime8bytes = 11400714785074694791ULL; - const U32 hashLog = LDM_HASHLOG; - if (LDM_isLittleEndian()) - return (U32)(((sequence << 24) * prime5bytes) >> (64 - hashLog)); - else - return (U32)(((sequence >> 24) * prime8bytes) >> (64 - hashLog)); -} - -static U32 LDM_hash_position(const void * const p) { - return LDM_hash(LDM_read32(p)); -} - -static void LDM_put_position_on_hash(const BYTE *p, U32 h, void *tableBase, - const BYTE *srcBase) { - U32 *hashTable = (U32 *) tableBase; - hashTable[h] = (U32)(p - srcBase); -} - -static void LDM_put_position(const BYTE *p, void *tableBase, - const BYTE *srcBase) { - U32 const h = LDM_hash_position(p); - LDM_put_position_on_hash(p, h, tableBase, srcBase); -} - -static const BYTE *LDM_get_position_on_hash( - U32 h, void *tableBase, const BYTE *srcBase) { - const U32 * const hashTable = (U32*)tableBase; - return hashTable[h] + srcBase; -} - -static BYTE LDM_read_byte(const void *memPtr) { - BYTE val; - memcpy(&val, memPtr, 1); - return val; -} - -static unsigned LDM_count(const BYTE *pIn, const BYTE *pMatch, - const BYTE *pInLimit) { - const BYTE * const pStart = pIn; - while (pIn < pInLimit - 1) { - BYTE const diff = LDM_read_byte(pMatch) ^ LDM_read_byte(pIn); - if (!diff) { - pIn++; - pMatch++; - continue; - } - return (unsigned)(pIn - pStart); - } - return (unsigned)(pIn - pStart); -} - -void LDM_read_header(void const *source, size_t *compressed_size, - size_t *decompressed_size) { - const U32 *ip = (const U32 *)source; - *compressed_size = *ip++; - *decompressed_size = *ip; -} - -size_t LDM_compress(void const *source, void *dest, size_t source_size, - size_t max_dest_size) { - const BYTE * const istart = (const BYTE*)source; - const BYTE *ip = istart; - const BYTE * const iend = istart + source_size; - const BYTE *ilimit = iend - HASH_SIZE; - const BYTE * const matchlimit = iend - HASH_SIZE; - const BYTE * const mflimit = iend - MINMATCH; - BYTE *op = (BYTE*) dest; - U32 hashTable[LDM_HASHTABLESIZE_U32]; - memset(hashTable, 0, sizeof(hashTable)); - - const BYTE *anchor = (const BYTE *)source; -// struct LDM_cctx cctx; - size_t output_size = 0; - - U32 forwardH; - - /* Hash first byte: put into hash table */ - - LDM_put_position(ip, hashTable, istart); - ip++; - forwardH = LDM_hash_position(ip); - - //TODO Loop terminates before ip>=ilimit. - while (ip < ilimit) { - const BYTE *match; - BYTE *token; - - /* Find a match */ - { - const BYTE *forwardIp = ip; - unsigned step = 1; - - do { - U32 const h = forwardH; - ip = forwardIp; - forwardIp += step; - - if (forwardIp > mflimit) { - goto _last_literals; - } - - match = LDM_get_position_on_hash(h, hashTable, istart); - - forwardH = LDM_hash_position(forwardIp); - LDM_put_position_on_hash(ip, h, hashTable, istart); - } while (ip - match > WINDOW_SIZE || - LDM_read64(match) != LDM_read64(ip)); - } - - // TODO catchup - while (ip > anchor && match > istart && ip[-1] == match[-1]) { - ip--; - match--; - } - - /* Encode literals */ - { - unsigned const litLength = (unsigned)(ip - anchor); - token = op++; - -#ifdef LDM_DEBUG - printf("Cur position: %zu\n", anchor - istart); - printf("LitLength %zu. (Match offset). %zu\n", litLength, ip - match); -#endif - /* - fwrite(match, 4, 1, stdout); - printf("\n"); - */ - - if (litLength >= RUN_MASK) { - int len = (int)litLength - RUN_MASK; - *token = (RUN_MASK << ML_BITS); - for (; len >= 255; len -= 255) { - *op++ = 255; - } - *op++ = (BYTE)len; - } else { - *token = (BYTE)(litLength << ML_BITS); - } -#ifdef LDM_DEBUG - printf("Literals "); - fwrite(anchor, litLength, 1, stdout); - printf("\n"); -#endif - memcpy(op, anchor, litLength); - //LDM_wild_copy(op, anchor, op + litLength); - op += litLength; - } -_next_match: - /* Encode offset */ - { - LDM_write32(op, ip - match); - op += 4; - } - - /* Encode Match Length */ - { - unsigned matchCode; - matchCode = LDM_count(ip + MINMATCH, match + MINMATCH, - matchlimit); -#ifdef LDM_DEBUG - printf("Match length %zu\n", matchCode + MINMATCH); - fwrite(ip, MINMATCH + matchCode, 1, stdout); - printf("\n"); -#endif - ip += MINMATCH + matchCode; - if (matchCode >= ML_MASK) { - *token += ML_MASK; - matchCode -= ML_MASK; - LDM_write32(op, 0xFFFFFFFF); - while (matchCode >= 4*0xFF) { - op += 4; - LDM_write32(op, 0xffffffff); - matchCode -= 4*0xFF; - } - op += matchCode / 255; - *op++ = (BYTE)(matchCode % 255); - } else { - *token += (BYTE)(matchCode); - } -#ifdef LDM_DEBUG - printf("\n"); -#endif - } - - anchor = ip; - - LDM_put_position(ip, hashTable, istart); - forwardH = LDM_hash_position(++ip); - } -_last_literals: - /* Encode last literals */ - { - size_t const lastRun = (size_t)(iend - anchor); - if (lastRun >= RUN_MASK) { - size_t accumulator = lastRun - RUN_MASK; - *op++ = RUN_MASK << ML_BITS; - for(; accumulator >= 255; accumulator -= 255) { - *op++ = 255; - } - *op++ = (BYTE)accumulator; - } else { - *op++ = (BYTE)(lastRun << ML_BITS); - } - memcpy(op, anchor, lastRun); - op += lastRun; - } - return (op - (BYTE *)dest); -} - -size_t LDM_decompress(void const *source, void *dest, size_t compressed_size, - size_t max_decompressed_size) { - const BYTE *ip = (const BYTE *)source; - const BYTE * const iend = ip + compressed_size; - BYTE *op = (BYTE *)dest; - BYTE * const oend = op + max_decompressed_size; - BYTE *cpy; - - while (ip < iend) { - size_t length; - const BYTE *match; - size_t offset; - - /* get literal length */ - unsigned const token = *ip++; - if ((length=(token >> ML_BITS)) == RUN_MASK) { - unsigned s; - do { - s = *ip++; - length += s; - } while (s == 255); - } -#ifdef LDM_DEBUG - printf("Literal length: %zu\n", length); -#endif - - /* copy literals */ - cpy = op + length; -#ifdef LDM_DEBUG - printf("Literals "); - fwrite(ip, length, 1, stdout); - printf("\n"); -#endif - memcpy(op, ip, length); -// LDM_wild_copy(op, ip, cpy); - ip += length; - op = cpy; - - /* get offset */ - offset = LDM_read32(ip); - -#ifdef LDM_DEBUG - printf("Offset: %zu\n", offset); -#endif - ip += 4; - match = op - offset; - // LDM_write32(op, (U32)offset); - - /* get matchlength */ - length = token & ML_MASK; - if (length == ML_MASK) { - unsigned s; - do { - s = *ip++; - length += s; - } while (s == 255); - } - length += MINMATCH; -#ifdef LDM_DEBUG - printf("Match length: %zu\n", length); -#endif - /* copy match */ - cpy = op + length; - - // Inefficient for now - - while (match < cpy - offset && op < oend) { - *op++ = *match++; - } - } -// memcpy(dest, source, compressed_size); - return op - (BYTE *)dest; -} - - diff --git a/contrib/long_distance_matching/versions/v0.1/ldm.h b/contrib/long_distance_matching/versions/v0.1/ldm.h deleted file mode 100644 index f4ca25a3..00000000 --- a/contrib/long_distance_matching/versions/v0.1/ldm.h +++ /dev/null @@ -1,19 +0,0 @@ -#ifndef LDM_H -#define LDM_H - -#include /* size_t */ - -#define LDM_COMPRESS_SIZE 4 -#define LDM_DECOMPRESS_SIZE 4 -#define LDM_HEADER_SIZE ((LDM_COMPRESS_SIZE)+(LDM_DECOMPRESS_SIZE)) - -size_t LDM_compress(void const *source, void *dest, size_t source_size, - size_t max_dest_size); - -size_t LDM_decompress(void const *source, void *dest, size_t compressed_size, - size_t max_decompressed_size); - -void LDM_read_header(void const *source, size_t *compressed_size, - size_t *decompressed_size); - -#endif /* LDM_H */ diff --git a/contrib/long_distance_matching/versions/v0.1/main-ldm.c b/contrib/long_distance_matching/versions/v0.1/main-ldm.c deleted file mode 100644 index 10869cce..00000000 --- a/contrib/long_distance_matching/versions/v0.1/main-ldm.c +++ /dev/null @@ -1,459 +0,0 @@ -// TODO: file size must fit into a U32 - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include "ldm.h" - -// #define BUF_SIZE 16*1024 // Block size -#define DEBUG - -//#define ZSTD - -#if 0 -static size_t compress_file(FILE *in, FILE *out, size_t *size_in, - size_t *size_out) { - char *src, *buf = NULL; - size_t r = 1; - size_t size, n, k, count_in = 0, count_out = 0, offset, frame_size = 0; - - src = malloc(BUF_SIZE); - if (!src) { - printf("Not enough memory\n"); - goto cleanup; - } - - size = BUF_SIZE + LDM_HEADER_SIZE; - buf = malloc(size); - if (!buf) { - printf("Not enough memory\n"); - goto cleanup; - } - - - for (;;) { - k = fread(src, 1, BUF_SIZE, in); - if (k == 0) - break; - count_in += k; - - n = LDM_compress(src, buf, k, BUF_SIZE); - - // n = k; - // offset += n; - offset = k; - count_out += k; - -// k = fwrite(src, 1, offset, out); - - k = fwrite(buf, 1, offset, out); - if (k < offset) { - if (ferror(out)) - printf("Write failed\n"); - else - printf("Short write\n"); - goto cleanup; - } - - } - *size_in = count_in; - *size_out = count_out; - r = 0; - cleanup: - free(src); - free(buf); - return r; -} - -static size_t decompress_file(FILE *in, FILE *out) { - void *src = malloc(BUF_SIZE); - void *dst = NULL; - size_t dst_capacity = BUF_SIZE; - size_t ret = 1; - size_t bytes_written = 0; - - if (!src) { - perror("decompress_file(src)"); - goto cleanup; - } - - while (ret != 0) { - /* Load more input */ - size_t src_size = fread(src, 1, BUF_SIZE, in); - void *src_ptr = src; - void *src_end = src_ptr + src_size; - if (src_size == 0 || ferror(in)) { - printf("(TODO): Decompress: not enough input or error reading file\n"); - //TODO - ret = 0; - goto cleanup; - } - - /* Allocate destination buffer if it hasn't been allocated already */ - if (!dst) { - dst = malloc(dst_capacity); - if (!dst) { - perror("decompress_file(dst)"); - goto cleanup; - } - } - - // TODO - - /* Decompress: - * Continue while there is more input to read. - */ - while (src_ptr != src_end && ret != 0) { - // size_t dst_size = src_size; - size_t dst_size = LDM_decompress(src, dst, src_size, dst_capacity); - size_t written = fwrite(dst, 1, dst_size, out); -// printf("Writing %zu bytes\n", dst_size); - bytes_written += dst_size; - if (written != dst_size) { - printf("Decompress: Failed to write to file\n"); - goto cleanup; - } - src_ptr += src_size; - src_size = src_end - src_ptr; - } - - /* Update input */ - - } - - printf("Wrote %zu bytes\n", bytes_written); - - cleanup: - free(src); - free(dst); - - return ret; -} -#endif - -static size_t compress(const char *fname, const char *oname) { - int fdin, fdout; - struct stat statbuf; - char *src, *dst; - - /* open the input file */ - if ((fdin = open(fname, O_RDONLY)) < 0) { - perror("Error in file opening"); - return 1; - } - - /* open the output file */ - if ((fdout = open(oname, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600)) < 0) { - perror("Can't create output file"); - return 1; - } - - /* find size of input file */ - if (fstat (fdin, &statbuf) < 0) { - perror("Fstat error"); - return 1; - } - size_t size_in = statbuf.st_size; - - /* go to the location corresponding to the last byte */ - if (lseek(fdout, size_in + LDM_HEADER_SIZE - 1, SEEK_SET) == -1) { - perror("lseek error"); - return 1; - } - - /* write a dummy byte at the last location */ - if (write(fdout, "", 1) != 1) { - perror("write error"); - return 1; - } - - /* mmap the input file */ - if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0)) - == (caddr_t) - 1) { - perror("mmap error for input"); - return 1; - } - size_t out_size = statbuf.st_size + LDM_HEADER_SIZE; - - /* mmap the output file */ - if ((dst = mmap(0, out_size, PROT_READ | PROT_WRITE, - MAP_SHARED, fdout, 0)) == (caddr_t) - 1) { - perror("mmap error for output"); - return 1; - } - - #ifdef ZSTD - size_t size_out = ZSTD_compress(dst, statbuf.st_size, - src, statbuf.st_size, 1); - #else - size_t size_out = LDM_compress(src, dst + LDM_HEADER_SIZE, statbuf.st_size, - statbuf.st_size); - size_out += LDM_HEADER_SIZE; - - // TODO: should depend on LDM_DECOMPRESS_SIZE write32 - memcpy(dst, &size_out, 4); - memcpy(dst + 4, &(statbuf.st_size), 4); - printf("Compressed size: %zu\n", size_out); - printf("Decompressed size: %zu\n", statbuf.st_size); - #endif - ftruncate(fdout, size_out); - - printf("%25s : %6u -> %7u - %s (%.1f%%)\n", fname, - (unsigned)statbuf.st_size, (unsigned)size_out, oname, - (double)size_out / (statbuf.st_size) * 100); - - close(fdin); - close(fdout); - return 0; -} - -static size_t decompress(const char *fname, const char *oname) { - int fdin, fdout; - struct stat statbuf; - char *src, *dst; - - /* open the input file */ - if ((fdin = open(fname, O_RDONLY)) < 0) { - perror("Error in file opening"); - return 1; - } - - /* open the output file */ - if ((fdout = open(oname, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600)) < 0) { - perror("Can't create output file"); - return 1; - } - - /* find size of input file */ - if (fstat (fdin, &statbuf) < 0) { - perror("Fstat error"); - return 1; - } - - /* mmap the input file */ - if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0)) - == (caddr_t) - 1) { - perror("mmap error for input"); - return 1; - } - - /* read header */ - size_t compressed_size, decompressed_size; - LDM_read_header(src, &compressed_size, &decompressed_size); - - printf("Size, compressed_size, decompressed_size: %zu %zu %zu\n", - statbuf.st_size, compressed_size, decompressed_size); - - /* go to the location corresponding to the last byte */ - if (lseek(fdout, decompressed_size - 1, SEEK_SET) == -1) { - perror("lseek error"); - return 1; - } - - /* write a dummy byte at the last location */ - if (write(fdout, "", 1) != 1) { - perror("write error"); - return 1; - } - - /* mmap the output file */ - if ((dst = mmap(0, decompressed_size, PROT_READ | PROT_WRITE, - MAP_SHARED, fdout, 0)) == (caddr_t) - 1) { - perror("mmap error for output"); - return 1; - } - - /* Copy input file to output file */ -// memcpy(dst, src, statbuf.st_size); - - #ifdef ZSTD - size_t size_out = ZSTD_decompress(dst, decomrpessed_size, - src + LDM_HEADER_SIZE, - statbuf.st_size - LDM_HEADER_SIZE); - #else - size_t size_out = LDM_decompress(src + LDM_HEADER_SIZE, dst, - statbuf.st_size - LDM_HEADER_SIZE, - decompressed_size); - printf("Ret size out: %zu\n", size_out); - #endif - ftruncate(fdout, size_out); - - close(fdin); - close(fdout); - return 0; -} - -static int compare(FILE *fp0, FILE *fp1) { - int result = 0; - while (result == 0) { - char b0[1024]; - char b1[1024]; - const size_t r0 = fread(b0, 1, sizeof(b0), fp0); - const size_t r1 = fread(b1, 1, sizeof(b1), fp1); - - result = (int)r0 - (int)r1; - - if (0 == r0 || 0 == r1) { - break; - } - if (0 == result) { - result = memcmp(b0, b1, r0); - } - } - return result; -} - -static void verify(const char *inpFilename, const char *decFilename) { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *decFp = fopen(decFilename, "rb"); - - printf("verify : %s <-> %s\n", inpFilename, decFilename); - const int cmp = compare(inpFp, decFp); - if(0 == cmp) { - printf("verify : OK\n"); - } else { - printf("verify : NG\n"); - } - - fclose(decFp); - fclose(inpFp); -} - -int main(int argc, const char *argv[]) { - const char * const exeName = argv[0]; - char inpFilename[256] = { 0 }; - char ldmFilename[256] = { 0 }; - char decFilename[256] = { 0 }; - - if (argc < 2) { - printf("Wrong arguments\n"); - printf("Usage:\n"); - printf("%s FILE\n", exeName); - return 1; - } - - snprintf(inpFilename, 256, "%s", argv[1]); - snprintf(ldmFilename, 256, "%s.ldm", argv[1]); - snprintf(decFilename, 256, "%s.ldm.dec", argv[1]); - - printf("inp = [%s]\n", inpFilename); - printf("ldm = [%s]\n", ldmFilename); - printf("dec = [%s]\n", decFilename); - - struct timeval tv1, tv2; - /* compress */ - { - gettimeofday(&tv1, NULL); - if (compress(inpFilename, ldmFilename)) { - printf("Compress error"); - return 1; - } - gettimeofday(&tv2, NULL); - printf("Total time = %f seconds\n", - (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 + - (double) (tv2.tv_sec - tv1.tv_sec)); - } - - /* decompress */ - - gettimeofday(&tv1, NULL); - if (decompress(ldmFilename, decFilename)) { - printf("Decompress error"); - return 1; - } - gettimeofday(&tv2, NULL); - printf("Total time = %f seconds\n", - (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 + - (double) (tv2.tv_sec - tv1.tv_sec)); - - /* verify */ - verify(inpFilename, decFilename); - return 0; -} - -#if 0 -int main2(int argc, char *argv[]) { - char inpFilename[256] = { 0 }; - char ldmFilename[256] = { 0 }; - char decFilename[256] = { 0 }; - - if (argc < 2) { - printf("Please specify input filename\n"); - return 0; - } - snprintf(inpFilename, 256, "%s", argv[1]); - snprintf(ldmFilename, 256, "%s.ldm", argv[1]); - snprintf(decFilename, 256, "%s.ldm.dec", argv[1]); - - printf("inp = [%s]\n", inpFilename); - printf("ldm = [%s]\n", ldmFilename); - printf("dec = [%s]\n", decFilename); - - /* compress */ - { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *outFp = fopen(ldmFilename, "wb"); - size_t sizeIn = 0; - size_t sizeOut = 0; - size_t ret; - printf("compress : %s -> %s\n", inpFilename, ldmFilename); - ret = compress_file(inpFp, outFp, &sizeIn, &sizeOut); - if (ret) { - printf("compress : failed with code %zu\n", ret); - return ret; - } - printf("%s: %zu → %zu bytes, %.1f%%\n", - inpFilename, sizeIn, sizeOut, - (double)sizeOut / sizeIn * 100); - printf("compress : done\n"); - - fclose(outFp); - fclose(inpFp); - } - - /* decompress */ - { - FILE *inpFp = fopen(ldmFilename, "rb"); - FILE *outFp = fopen(decFilename, "wb"); - size_t ret; - - printf("decompress : %s -> %s\n", ldmFilename, decFilename); - ret = decompress_file(inpFp, outFp); - if (ret) { - printf("decompress : failed with code %zu\n", ret); - return ret; - } - printf("decompress : done\n"); - - fclose(outFp); - fclose(inpFp); - } - - /* verify */ - { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *decFp = fopen(decFilename, "rb"); - - printf("verify : %s <-> %s\n", inpFilename, decFilename); - const int cmp = compare(inpFp, decFp); - if(0 == cmp) { - printf("verify : OK\n"); - } else { - printf("verify : NG\n"); - } - - fclose(decFp); - fclose(inpFp); - } - return 0; -} -#endif - diff --git a/contrib/long_distance_matching/versions/v0.2/Makefile b/contrib/long_distance_matching/versions/v0.2/Makefile deleted file mode 100644 index 4e04fd6a..00000000 --- a/contrib/long_distance_matching/versions/v0.2/Makefile +++ /dev/null @@ -1,32 +0,0 @@ -# ################################################################ -# Copyright (c) 2016-present, Yann Collet, Facebook, Inc. -# All rights reserved. -# -# This source code is licensed under the BSD-style license found in the -# LICENSE file in the root directory of this source tree. An additional grant -# of patent rights can be found in the PATENTS file in the same directory. -# ################################################################ - -# This Makefile presumes libzstd is installed, using `sudo make install` - - -LDFLAGS += -lzstd - -.PHONY: default all clean - -default: all - -all: main-ldm - - -#main : ldm.c main.c -# $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ - -main-ldm : ldm.c main-ldm.c - $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ - -clean: - @rm -f core *.o tmp* result* *.ldm *.ldm.dec \ - main main-ldm - @echo Cleaning completed - diff --git a/contrib/long_distance_matching/versions/v0.2/ldm.c b/contrib/long_distance_matching/versions/v0.2/ldm.c deleted file mode 100644 index 9081d136..00000000 --- a/contrib/long_distance_matching/versions/v0.2/ldm.c +++ /dev/null @@ -1,436 +0,0 @@ -#include -#include -#include -#include - -#include "ldm.h" - -#define HASH_EVERY 7 - -#define LDM_MEMORY_USAGE 14 -#define LDM_HASHLOG (LDM_MEMORY_USAGE-2) -#define LDM_HASHTABLESIZE (1 << (LDM_MEMORY_USAGE)) -#define LDM_HASHTABLESIZE_U32 ((LDM_HASHTABLESIZE) >> 2) -#define LDM_HASH_SIZE_U32 (1 << (LDM_HASHLOG)) - -#define WINDOW_SIZE (1 << 20) -#define MAX_WINDOW_SIZE 31 -#define HASH_SIZE 8 -#define MINMATCH 8 - -#define ML_BITS 4 -#define ML_MASK ((1U<>8); - } -} - -static U32 LDM_read32(const void *ptr) { - return *(const U32 *)ptr; -} - -static U64 LDM_read64(const void *ptr) { - return *(const U64 *)ptr; -} - -static void LDM_copy8(void *dst, const void *src) { - memcpy(dst, src, 8); -} - -typedef struct compress_stats { - U32 num_matches; - U32 total_match_length; - U32 total_literal_length; - U64 total_offset; -} compress_stats; - -static void LDM_printCompressStats(const compress_stats *stats) { - printf("=====================\n"); - printf("Compression statistics\n"); - printf("Total number of matches: %u\n", stats->num_matches); - printf("Average match length: %.1f\n", ((double)stats->total_match_length) / - (double)stats->num_matches); - printf("Average literal length: %.1f\n", - ((double)stats->total_literal_length) / (double)stats->num_matches); - printf("Average offset length: %.1f\n", - ((double)stats->total_offset) / (double)stats->num_matches); - printf("=====================\n"); -} - -// TODO: unused. -struct hash_entry { - U64 offset; - tag t; -}; - -static U32 LDM_hash(U32 sequence) { - return ((sequence * 2654435761U) >> ((32)-LDM_HASHLOG)); -} - -static U32 LDM_hash5(U64 sequence) { - static const U64 prime5bytes = 889523592379ULL; - static const U64 prime8bytes = 11400714785074694791ULL; - const U32 hashLog = LDM_HASHLOG; - if (LDM_isLittleEndian()) - return (U32)(((sequence << 24) * prime5bytes) >> (64 - hashLog)); - else - return (U32)(((sequence >> 24) * prime8bytes) >> (64 - hashLog)); -} - -static U32 LDM_hash_position(const void * const p) { - return LDM_hash(LDM_read32(p)); -} - -static void LDM_put_position_on_hash(const BYTE *p, U32 h, void *tableBase, - const BYTE *srcBase) { - if (((p - srcBase) & HASH_EVERY) != HASH_EVERY) { - return; - } - - U32 *hashTable = (U32 *) tableBase; - hashTable[h] = (U32)(p - srcBase); -} - -static void LDM_put_position(const BYTE *p, void *tableBase, - const BYTE *srcBase) { - if (((p - srcBase) & HASH_EVERY) != HASH_EVERY) { - return; - } - U32 const h = LDM_hash_position(p); - LDM_put_position_on_hash(p, h, tableBase, srcBase); -} - -static const BYTE *LDM_get_position_on_hash( - U32 h, void *tableBase, const BYTE *srcBase) { - const U32 * const hashTable = (U32*)tableBase; - return hashTable[h] + srcBase; -} - -static BYTE LDM_read_byte(const void *memPtr) { - BYTE val; - memcpy(&val, memPtr, 1); - return val; -} - -static unsigned LDM_count(const BYTE *pIn, const BYTE *pMatch, - const BYTE *pInLimit) { - const BYTE * const pStart = pIn; - while (pIn < pInLimit - 1) { - BYTE const diff = LDM_read_byte(pMatch) ^ LDM_read_byte(pIn); - if (!diff) { - pIn++; - pMatch++; - continue; - } - return (unsigned)(pIn - pStart); - } - return (unsigned)(pIn - pStart); -} - -void LDM_read_header(const void *src, size_t *compressSize, - size_t *decompressSize) { - const U32 *ip = (const U32 *)src; - *compressSize = *ip++; - *decompressSize = *ip; -} - -// TODO: maxDstSize is unused -size_t LDM_compress(const void *src, size_t srcSize, - void *dst, size_t maxDstSize) { - const BYTE * const istart = (const BYTE*)src; - const BYTE *ip = istart; - const BYTE * const iend = istart + srcSize; - const BYTE *ilimit = iend - HASH_SIZE; - const BYTE * const matchlimit = iend - HASH_SIZE; - const BYTE * const mflimit = iend - MINMATCH; - BYTE *op = (BYTE*) dst; - - compress_stats compressStats = { 0 }; - - U32 hashTable[LDM_HASHTABLESIZE_U32]; - memset(hashTable, 0, sizeof(hashTable)); - - const BYTE *anchor = (const BYTE *)src; -// struct LDM_cctx cctx; - size_t output_size = 0; - - U32 forwardH; - - /* Hash first byte: put into hash table */ - - LDM_put_position(ip, hashTable, istart); - const BYTE *lastHash = ip; - ip++; - forwardH = LDM_hash_position(ip); - - //TODO Loop terminates before ip>=ilimit. - while (ip < ilimit) { - const BYTE *match; - BYTE *token; - - /* Find a match */ - { - const BYTE *forwardIp = ip; - unsigned step = 1; - - do { - U32 const h = forwardH; - ip = forwardIp; - forwardIp += step; - - if (forwardIp > mflimit) { - goto _last_literals; - } - - match = LDM_get_position_on_hash(h, hashTable, istart); - - forwardH = LDM_hash_position(forwardIp); - LDM_put_position_on_hash(ip, h, hashTable, istart); - lastHash = ip; - } while (ip - match > WINDOW_SIZE || - LDM_read64(match) != LDM_read64(ip)); - } - compressStats.num_matches++; - - /* Catchup: look back to extend match from found match */ - while (ip > anchor && match > istart && ip[-1] == match[-1]) { - ip--; - match--; - } - - /* Encode literals */ - { - unsigned const litLength = (unsigned)(ip - anchor); - token = op++; - - compressStats.total_literal_length += litLength; - -#ifdef LDM_DEBUG - printf("Cur position: %zu\n", anchor - istart); - printf("LitLength %zu. (Match offset). %zu\n", litLength, ip - match); -#endif - - if (litLength >= RUN_MASK) { - int len = (int)litLength - RUN_MASK; - *token = (RUN_MASK << ML_BITS); - for (; len >= 255; len -= 255) { - *op++ = 255; - } - *op++ = (BYTE)len; - } else { - *token = (BYTE)(litLength << ML_BITS); - } -#ifdef LDM_DEBUG - printf("Literals "); - fwrite(anchor, litLength, 1, stdout); - printf("\n"); -#endif - memcpy(op, anchor, litLength); - op += litLength; - } -_next_match: - /* Encode offset */ - { - /* - LDM_writeLE16(op, ip-match); - op += 2; - */ - LDM_write32(op, ip - match); - op += 4; - compressStats.total_offset += (ip - match); - } - - /* Encode Match Length */ - { - unsigned matchCode; - matchCode = LDM_count(ip + MINMATCH, match + MINMATCH, - matchlimit); -#ifdef LDM_DEBUG - printf("Match length %zu\n", matchCode + MINMATCH); - fwrite(ip, MINMATCH + matchCode, 1, stdout); - printf("\n"); -#endif - compressStats.total_match_length += matchCode + MINMATCH; - unsigned ctr = 1; - ip++; - for (; ctr < MINMATCH + matchCode; ip++, ctr++) { - LDM_put_position(ip, hashTable, istart); - } -// ip += MINMATCH + matchCode; - if (matchCode >= ML_MASK) { - *token += ML_MASK; - matchCode -= ML_MASK; - LDM_write32(op, 0xFFFFFFFF); - while (matchCode >= 4*0xFF) { - op += 4; - LDM_write32(op, 0xffffffff); - matchCode -= 4*0xFF; - } - op += matchCode / 255; - *op++ = (BYTE)(matchCode % 255); - } else { - *token += (BYTE)(matchCode); - } -#ifdef LDM_DEBUG - printf("\n"); - -#endif - } - - anchor = ip; - - LDM_put_position(ip, hashTable, istart); - forwardH = LDM_hash_position(++ip); - lastHash = ip; - } -_last_literals: - /* Encode last literals */ - { - size_t const lastRun = (size_t)(iend - anchor); - if (lastRun >= RUN_MASK) { - size_t accumulator = lastRun - RUN_MASK; - *op++ = RUN_MASK << ML_BITS; - for(; accumulator >= 255; accumulator -= 255) { - *op++ = 255; - } - *op++ = (BYTE)accumulator; - } else { - *op++ = (BYTE)(lastRun << ML_BITS); - } - memcpy(op, anchor, lastRun); - op += lastRun; - } - LDM_printCompressStats(&compressStats); - return (op - (BYTE *)dst); -} - -typedef struct LDM_DCtx { - const BYTE * const ibase; /* Pointer to base of input */ - const BYTE *ip; /* Pointer to current input position */ - const BYTE *iend; /* End of source */ - BYTE *op; /* Pointer to output */ - const BYTE * const oend; /* Pointer to end of output */ - -} LDM_DCtx; - -size_t LDM_decompress(const void *src, size_t compressed_size, - void *dst, size_t max_decompressed_size) { - const BYTE *ip = (const BYTE *)src; - const BYTE * const iend = ip + compressed_size; - BYTE *op = (BYTE *)dst; - BYTE * const oend = op + max_decompressed_size; - BYTE *cpy; - - while (ip < iend) { - size_t length; - const BYTE *match; - size_t offset; - - /* get literal length */ - unsigned const token = *ip++; - if ((length=(token >> ML_BITS)) == RUN_MASK) { - unsigned s; - do { - s = *ip++; - length += s; - } while (s == 255); - } -#ifdef LDM_DEBUG - printf("Literal length: %zu\n", length); -#endif - - /* copy literals */ - cpy = op + length; -#ifdef LDM_DEBUG - printf("Literals "); - fwrite(ip, length, 1, stdout); - printf("\n"); -#endif - memcpy(op, ip, length); - ip += length; - op = cpy; - - /* get offset */ - /* - offset = LDM_readLE16(ip); - ip += 2; - */ - offset = LDM_read32(ip); - ip += 4; -#ifdef LDM_DEBUG - printf("Offset: %zu\n", offset); -#endif - match = op - offset; - // LDM_write32(op, (U32)offset); - - /* get matchlength */ - length = token & ML_MASK; - if (length == ML_MASK) { - unsigned s; - do { - s = *ip++; - length += s; - } while (s == 255); - } - length += MINMATCH; -#ifdef LDM_DEBUG - printf("Match length: %zu\n", length); -#endif - /* copy match */ - cpy = op + length; - - // Inefficient for now - while (match < cpy - offset && op < oend) { - *op++ = *match++; - } - } - return op - (BYTE *)dst; -} - - diff --git a/contrib/long_distance_matching/versions/v0.2/ldm.h b/contrib/long_distance_matching/versions/v0.2/ldm.h deleted file mode 100644 index 0ac7b2ec..00000000 --- a/contrib/long_distance_matching/versions/v0.2/ldm.h +++ /dev/null @@ -1,19 +0,0 @@ -#ifndef LDM_H -#define LDM_H - -#include /* size_t */ - -#define LDM_COMPRESS_SIZE 4 -#define LDM_DECOMPRESS_SIZE 4 -#define LDM_HEADER_SIZE ((LDM_COMPRESS_SIZE)+(LDM_DECOMPRESS_SIZE)) - -size_t LDM_compress(const void *src, size_t srcSize, - void *dst, size_t maxDstSize); - -size_t LDM_decompress(const void *src, size_t srcSize, - void *dst, size_t maxDstSize); - -void LDM_read_header(const void *src, size_t *compressSize, - size_t *decompressSize); - -#endif /* LDM_H */ diff --git a/contrib/long_distance_matching/versions/v0.2/main-ldm.c b/contrib/long_distance_matching/versions/v0.2/main-ldm.c deleted file mode 100644 index 0017335b..00000000 --- a/contrib/long_distance_matching/versions/v0.2/main-ldm.c +++ /dev/null @@ -1,474 +0,0 @@ -// TODO: file size must fit into a U32 - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include "ldm.h" - -// #define BUF_SIZE 16*1024 // Block size -#define DEBUG - -//#define ZSTD - -/* Compress file given by fname and output to oname. - * Returns 0 if successful, error code otherwise. - */ -static int compress(const char *fname, const char *oname) { - int fdin, fdout; - struct stat statbuf; - char *src, *dst; - - /* Open the input file. */ - if ((fdin = open(fname, O_RDONLY)) < 0) { - perror("Error in file opening"); - return 1; - } - - /* Open the output file. */ - if ((fdout = open(oname, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600)) < 0) { - perror("Can't create output file"); - return 1; - } - - /* Find the size of the input file. */ - if (fstat (fdin, &statbuf) < 0) { - perror("Fstat error"); - return 1; - } - - size_t maxCompressSize = statbuf.st_size + LDM_HEADER_SIZE; - - /* Go to the location corresponding to the last byte. */ - /* TODO: fallocate? */ - if (lseek(fdout, maxCompressSize - 1, SEEK_SET) == -1) { - perror("lseek error"); - return 1; - } - - /* Write a dummy byte at the last location. */ - if (write(fdout, "", 1) != 1) { - perror("write error"); - return 1; - } - - /* mmap the input file. */ - if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0)) - == (caddr_t) - 1) { - perror("mmap error for input"); - return 1; - } - - /* mmap the output file */ - if ((dst = mmap(0, maxCompressSize, PROT_READ | PROT_WRITE, - MAP_SHARED, fdout, 0)) == (caddr_t) - 1) { - perror("mmap error for output"); - return 1; - } - -#ifdef ZSTD - size_t compressSize = ZSTD_compress(dst, statbuf.st_size, - src, statbuf.st_size, 1); -#else - size_t compressSize = LDM_HEADER_SIZE + - LDM_compress(src, statbuf.st_size, - dst + LDM_HEADER_SIZE, statbuf.st_size); - - // Write compress and decompress size to header - // TODO: should depend on LDM_DECOMPRESS_SIZE write32 - memcpy(dst, &compressSize, 4); - memcpy(dst + 4, &(statbuf.st_size), 4); - -#ifdef DEBUG - printf("Compressed size: %zu\n", compressSize); - printf("Decompressed size: %zu\n", statbuf.st_size); -#endif -#endif - - // Truncate file to compressSize. - ftruncate(fdout, compressSize); - - printf("%25s : %6u -> %7u - %s (%.1f%%)\n", fname, - (unsigned)statbuf.st_size, (unsigned)compressSize, oname, - (double)compressSize / (statbuf.st_size) * 100); - - // Close files. - close(fdin); - close(fdout); - return 0; -} - -/* Decompress file compressed using LDM_compress. - * The input file should have the LDM_HEADER followed by payload. - * Returns 0 if succesful, and an error code otherwise. - */ -static int decompress(const char *fname, const char *oname) { - int fdin, fdout; - struct stat statbuf; - char *src, *dst; - - /* Open the input file. */ - if ((fdin = open(fname, O_RDONLY)) < 0) { - perror("Error in file opening"); - return 1; - } - - /* Open the output file. */ - if ((fdout = open(oname, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600)) < 0) { - perror("Can't create output file"); - return 1; - } - - /* Find the size of the input file. */ - if (fstat (fdin, &statbuf) < 0) { - perror("Fstat error"); - return 1; - } - - /* mmap the input file. */ - if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0)) - == (caddr_t) - 1) { - perror("mmap error for input"); - return 1; - } - - /* Read the header. */ - size_t compressSize, decompressSize; - LDM_read_header(src, &compressSize, &decompressSize); - -#ifdef DEBUG - printf("Size, compressSize, decompressSize: %zu %zu %zu\n", - statbuf.st_size, compressSize, decompressSize); -#endif - - /* Go to the location corresponding to the last byte. */ - if (lseek(fdout, decompressSize - 1, SEEK_SET) == -1) { - perror("lseek error"); - return 1; - } - - /* write a dummy byte at the last location */ - if (write(fdout, "", 1) != 1) { - perror("write error"); - return 1; - } - - /* mmap the output file */ - if ((dst = mmap(0, decompressSize, PROT_READ | PROT_WRITE, - MAP_SHARED, fdout, 0)) == (caddr_t) - 1) { - perror("mmap error for output"); - return 1; - } - -#ifdef ZSTD - size_t outSize = ZSTD_decompress(dst, decomrpessed_size, - src + LDM_HEADER_SIZE, - statbuf.st_size - LDM_HEADER_SIZE); -#else - size_t outSize = LDM_decompress( - src + LDM_HEADER_SIZE, statbuf.st_size - LDM_HEADER_SIZE, - dst, decompressSize); - - printf("Ret size out: %zu\n", outSize); - #endif - ftruncate(fdout, outSize); - - close(fdin); - close(fdout); - return 0; -} - -/* Compare two files. - * Returns 0 iff they are the same. - */ -static int compare(FILE *fp0, FILE *fp1) { - int result = 0; - while (result == 0) { - char b0[1024]; - char b1[1024]; - const size_t r0 = fread(b0, 1, sizeof(b0), fp0); - const size_t r1 = fread(b1, 1, sizeof(b1), fp1); - - result = (int)r0 - (int)r1; - - if (0 == r0 || 0 == r1) break; - - if (0 == result) result = memcmp(b0, b1, r0); - } - return result; -} - -/* Verify the input file is the same as the decompressed file. */ -static void verify(const char *inpFilename, const char *decFilename) { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *decFp = fopen(decFilename, "rb"); - - printf("verify : %s <-> %s\n", inpFilename, decFilename); - const int cmp = compare(inpFp, decFp); - if(0 == cmp) { - printf("verify : OK\n"); - } else { - printf("verify : NG\n"); - } - - fclose(decFp); - fclose(inpFp); -} - -int main(int argc, const char *argv[]) { - const char * const exeName = argv[0]; - char inpFilename[256] = { 0 }; - char ldmFilename[256] = { 0 }; - char decFilename[256] = { 0 }; - - if (argc < 2) { - printf("Wrong arguments\n"); - printf("Usage:\n"); - printf("%s FILE\n", exeName); - return 1; - } - - snprintf(inpFilename, 256, "%s", argv[1]); - snprintf(ldmFilename, 256, "%s.ldm", argv[1]); - snprintf(decFilename, 256, "%s.ldm.dec", argv[1]); - - printf("inp = [%s]\n", inpFilename); - printf("ldm = [%s]\n", ldmFilename); - printf("dec = [%s]\n", decFilename); - - struct timeval tv1, tv2; - - /* Compress */ - - gettimeofday(&tv1, NULL); - if (compress(inpFilename, ldmFilename)) { - printf("Compress error"); - return 1; - } - gettimeofday(&tv2, NULL); - printf("Total time = %f seconds\n", - (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 + - (double) (tv2.tv_sec - tv1.tv_sec)); - - /* Decompress */ - - gettimeofday(&tv1, NULL); - if (decompress(ldmFilename, decFilename)) { - printf("Decompress error"); - return 1; - } - gettimeofday(&tv2, NULL); - printf("Total time = %f seconds\n", - (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 + - (double) (tv2.tv_sec - tv1.tv_sec)); - - /* verify */ - verify(inpFilename, decFilename); - return 0; -} - - -#if 0 -static size_t compress_file(FILE *in, FILE *out, size_t *size_in, - size_t *size_out) { - char *src, *buf = NULL; - size_t r = 1; - size_t size, n, k, count_in = 0, count_out = 0, offset, frame_size = 0; - - src = malloc(BUF_SIZE); - if (!src) { - printf("Not enough memory\n"); - goto cleanup; - } - - size = BUF_SIZE + LDM_HEADER_SIZE; - buf = malloc(size); - if (!buf) { - printf("Not enough memory\n"); - goto cleanup; - } - - - for (;;) { - k = fread(src, 1, BUF_SIZE, in); - if (k == 0) - break; - count_in += k; - - n = LDM_compress(src, buf, k, BUF_SIZE); - - // n = k; - // offset += n; - offset = k; - count_out += k; - -// k = fwrite(src, 1, offset, out); - - k = fwrite(buf, 1, offset, out); - if (k < offset) { - if (ferror(out)) - printf("Write failed\n"); - else - printf("Short write\n"); - goto cleanup; - } - - } - *size_in = count_in; - *size_out = count_out; - r = 0; - cleanup: - free(src); - free(buf); - return r; -} - -static size_t decompress_file(FILE *in, FILE *out) { - void *src = malloc(BUF_SIZE); - void *dst = NULL; - size_t dst_capacity = BUF_SIZE; - size_t ret = 1; - size_t bytes_written = 0; - - if (!src) { - perror("decompress_file(src)"); - goto cleanup; - } - - while (ret != 0) { - /* Load more input */ - size_t src_size = fread(src, 1, BUF_SIZE, in); - void *src_ptr = src; - void *src_end = src_ptr + src_size; - if (src_size == 0 || ferror(in)) { - printf("(TODO): Decompress: not enough input or error reading file\n"); - //TODO - ret = 0; - goto cleanup; - } - - /* Allocate destination buffer if it hasn't been allocated already */ - if (!dst) { - dst = malloc(dst_capacity); - if (!dst) { - perror("decompress_file(dst)"); - goto cleanup; - } - } - - // TODO - - /* Decompress: - * Continue while there is more input to read. - */ - while (src_ptr != src_end && ret != 0) { - // size_t dst_size = src_size; - size_t dst_size = LDM_decompress(src, dst, src_size, dst_capacity); - size_t written = fwrite(dst, 1, dst_size, out); -// printf("Writing %zu bytes\n", dst_size); - bytes_written += dst_size; - if (written != dst_size) { - printf("Decompress: Failed to write to file\n"); - goto cleanup; - } - src_ptr += src_size; - src_size = src_end - src_ptr; - } - - /* Update input */ - - } - - printf("Wrote %zu bytes\n", bytes_written); - - cleanup: - free(src); - free(dst); - - return ret; -} - -int main2(int argc, char *argv[]) { - char inpFilename[256] = { 0 }; - char ldmFilename[256] = { 0 }; - char decFilename[256] = { 0 }; - - if (argc < 2) { - printf("Please specify input filename\n"); - return 0; - } - snprintf(inpFilename, 256, "%s", argv[1]); - snprintf(ldmFilename, 256, "%s.ldm", argv[1]); - snprintf(decFilename, 256, "%s.ldm.dec", argv[1]); - - printf("inp = [%s]\n", inpFilename); - printf("ldm = [%s]\n", ldmFilename); - printf("dec = [%s]\n", decFilename); - - /* compress */ - { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *outFp = fopen(ldmFilename, "wb"); - size_t sizeIn = 0; - size_t sizeOut = 0; - size_t ret; - printf("compress : %s -> %s\n", inpFilename, ldmFilename); - ret = compress_file(inpFp, outFp, &sizeIn, &sizeOut); - if (ret) { - printf("compress : failed with code %zu\n", ret); - return ret; - } - printf("%s: %zu → %zu bytes, %.1f%%\n", - inpFilename, sizeIn, sizeOut, - (double)sizeOut / sizeIn * 100); - printf("compress : done\n"); - - fclose(outFp); - fclose(inpFp); - } - - /* decompress */ - { - FILE *inpFp = fopen(ldmFilename, "rb"); - FILE *outFp = fopen(decFilename, "wb"); - size_t ret; - - printf("decompress : %s -> %s\n", ldmFilename, decFilename); - ret = decompress_file(inpFp, outFp); - if (ret) { - printf("decompress : failed with code %zu\n", ret); - return ret; - } - printf("decompress : done\n"); - - fclose(outFp); - fclose(inpFp); - } - - /* verify */ - { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *decFp = fopen(decFilename, "rb"); - - printf("verify : %s <-> %s\n", inpFilename, decFilename); - const int cmp = compare(inpFp, decFp); - if(0 == cmp) { - printf("verify : OK\n"); - } else { - printf("verify : NG\n"); - } - - fclose(decFp); - fclose(inpFp); - } - return 0; -} -#endif - diff --git a/contrib/long_distance_matching/versions/v0.3/Makefile b/contrib/long_distance_matching/versions/v0.3/Makefile index 5ffd4eaf..e5153970 100644 --- a/contrib/long_distance_matching/versions/v0.3/Makefile +++ b/contrib/long_distance_matching/versions/v0.3/Makefile @@ -1,12 +1,3 @@ -# ################################################################ -# Copyright (c) 2016-present, Yann Collet, Facebook, Inc. -# All rights reserved. -# -# This source code is licensed under the BSD-style license found in the -# LICENSE file in the root directory of this source tree. An additional grant -# of patent rights can be found in the PATENTS file in the same directory. -# ################################################################ - # This Makefile presumes libzstd is installed, using `sudo make install` CFLAGS ?= -O3 @@ -26,7 +17,6 @@ default: all all: main-ldm - #main : ldm.c main.c # $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ diff --git a/contrib/long_distance_matching/versions/v0.3/README b/contrib/long_distance_matching/versions/v0.3/README new file mode 100644 index 00000000..8699562e --- /dev/null +++ b/contrib/long_distance_matching/versions/v0.3/README @@ -0,0 +1,3 @@ +This version uses simple lz4-style compression: +- A 4-byte hash is inserted into the hash table for every position. +- Hash table replacement policy: direct overwrite. diff --git a/contrib/long_distance_matching/versions/v0.4/Makefile b/contrib/long_distance_matching/versions/v0.4/Makefile deleted file mode 100644 index 5ffd4eaf..00000000 --- a/contrib/long_distance_matching/versions/v0.4/Makefile +++ /dev/null @@ -1,40 +0,0 @@ -# ################################################################ -# Copyright (c) 2016-present, Yann Collet, Facebook, Inc. -# All rights reserved. -# -# This source code is licensed under the BSD-style license found in the -# LICENSE file in the root directory of this source tree. An additional grant -# of patent rights can be found in the PATENTS file in the same directory. -# ################################################################ - -# This Makefile presumes libzstd is installed, using `sudo make install` - -CFLAGS ?= -O3 -DEBUGFLAGS = -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \ - -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement \ - -Wstrict-prototypes -Wundef -Wpointer-arith -Wformat-security \ - -Wvla -Wformat=2 -Winit-self -Wfloat-equal -Wwrite-strings \ - -Wredundant-decls -CFLAGS += $(DEBUGFLAGS) $(MOREFLAGS) -FLAGS = $(CPPFLAGS) $(CFLAGS) - -LDFLAGS += -lzstd - -.PHONY: default all clean - -default: all - -all: main-ldm - - -#main : ldm.c main.c -# $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ - -main-ldm : util.c ldm.c main-ldm.c - $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ - -clean: - @rm -f core *.o tmp* result* *.ldm *.ldm.dec \ - main main-ldm - @echo Cleaning completed - diff --git a/contrib/long_distance_matching/versions/v0.4/ldm.c b/contrib/long_distance_matching/versions/v0.4/ldm.c deleted file mode 100644 index 79648097..00000000 --- a/contrib/long_distance_matching/versions/v0.4/ldm.c +++ /dev/null @@ -1,729 +0,0 @@ -#include -#include -#include -#include - - -#include "ldm.h" -#include "util.h" - -#define HASH_EVERY 1 - -#define LDM_MEMORY_USAGE 22 -#define LDM_HASHLOG (LDM_MEMORY_USAGE-2) -#define LDM_HASHTABLESIZE (1 << (LDM_MEMORY_USAGE)) -#define LDM_HASHTABLESIZE_U32 ((LDM_HASHTABLESIZE) >> 2) -#define LDM_HASH_SIZE_U32 (1 << (LDM_HASHLOG)) - -#define LDM_OFFSET_SIZE 4 - -#define WINDOW_SIZE (1 << 23) -#define MAX_WINDOW_SIZE 31 -#define HASH_SIZE 4 -#define LDM_HASH_LENGTH 4 - -// Should be multiple of four -#define MINMATCH 4 - -#define ML_BITS 4 -#define ML_MASK ((1U<numMatches); - printf("Average match length: %.1f\n", ((double)stats->totalMatchLength) / - (double)stats->numMatches); - printf("Average literal length: %.1f\n", - ((double)stats->totalLiteralLength) / (double)stats->numMatches); - printf("Average offset length: %.1f\n", - ((double)stats->totalOffset) / (double)stats->numMatches); - printf("Num collisions, num hash inserts, %% collisions: %u, %u, %.3f\n", - stats->numCollisions, stats->numHashInserts, - stats->numHashInserts == 0 ? - 1.0 : (100.0 * (double)stats->numCollisions) / - (double)stats->numHashInserts); - printf("=====================\n"); -} - -typedef struct LDM_CCtx { - size_t isize; /* Input size */ - size_t maxOSize; /* Maximum output size */ - - const BYTE *ibase; /* Base of input */ - const BYTE *ip; /* Current input position */ - const BYTE *iend; /* End of input */ - - // Maximum input position such that hashing at the position does not exceed - // end of input. - const BYTE *ihashLimit; - - // Maximum input position such that finding a match of at least the minimum - // match length does not exceed end of input. - const BYTE *imatchLimit; - - const BYTE *obase; /* Base of output */ - BYTE *op; /* Output */ - - const BYTE *anchor; /* Anchor to start of current (match) block */ - - LDM_compressStats stats; /* Compression statistics */ - - LDM_hashEntry hashTable[LDM_HASHTABLESIZE_U32]; - - const BYTE *lastPosHashed; /* Last position hashed */ - hash_t lastHash; /* Hash corresponding to lastPosHashed */ - const BYTE *nextIp; - const BYTE *nextPosHashed; - hash_t nextHash; /* Hash corresponding to nextPosHashed */ - - // Members for rolling hash. - U32 lastSum; - U32 nextSum; - - unsigned step; - - // DEBUG - const BYTE *DEBUG_setNextHash; -} LDM_CCtx; - -static int LDM_isValidMatch(const BYTE *p, const BYTE *match) { - U16 lengthLeft = MINMATCH; - const BYTE *curP = p; - const BYTE *curMatch = match; - - for (; lengthLeft >= 8; lengthLeft -= 8) { - if (LDM_read64(curP) != LDM_read64(curMatch)) { - return 0; - } - curP += 8; - curMatch += 8; - } - if (lengthLeft > 0) { - return LDM_read32(curP) == LDM_read32(curMatch); - } - return 1; -} - - - -#ifdef LDM_ROLLING_HASH -/** - * Convert a sum computed from LDM_getRollingHash to a hash value in the range - * of the hash table. - */ -static hash_t LDM_sumToHash(U32 sum) { - return sum & (LDM_HASH_SIZE_U32 - 1); -} - -static U32 LDM_getRollingHash(const char *data, U32 len) { - U32 i; - U32 s1, s2; - const schar *buf = (const schar *)data; - - s1 = s2 = 0; - for (i = 0; i < (len - 4); i += 4) { - s2 += (4 * (s1 + buf[i])) + (3 * buf[i + 1]) + - (2 * buf[i + 2]) + (buf[i + 3]); - s1 += buf[i] + buf[i + 1] + buf[i + 2] + buf[i + 3]; - } - for(; i < len; i++) { - s1 += buf[i]; - s2 += s1; - } - return (s1 & 0xffff) + (s2 << 16); -} - -typedef struct LDM_sumStruct { - U16 s1, s2; -} LDM_sumStruct; - -static U32 LDM_updateRollingHash(U32 sum, U32 len, - schar toRemove, schar toAdd) { - U32 s1 = (sum & 0xffff) - toRemove + toAdd; - U32 s2 = (sum >> 16) - (toRemove * len) + s1; - - return (s1 & 0xffff) + (s2 << 16); -} - - -/* -static hash_t LDM_hashPosition(const void * const p) { - return LDM_sumToHash(LDM_getRollingHash((const char *)p, LDM_HASH_LENGTH)); -} -*/ - -/* -static void LDM_getRollingHashParts(U32 sum, LDM_sumStruct *sumStruct) { - sumStruct->s1 = sum & 0xffff; - sumStruct->s2 = sum >> 16; -} -*/ - -static void LDM_setNextHash(LDM_CCtx *cctx) { - -#ifdef RUN_CHECKS - U32 check; - if ((cctx->nextIp - cctx->ibase != 1) && - (cctx->nextIp - cctx->DEBUG_setNextHash != 1)) { - printf("CHECK debug fail: %zu %zu\n", cctx->nextIp - cctx->ibase, - cctx->DEBUG_setNextHash - cctx->ibase); - } - - cctx->DEBUG_setNextHash = cctx->nextIp; -#endif - -// cctx->nextSum = LDM_getRollingHash((const char *)cctx->nextIp, LDM_HASH_LENGTH); - cctx->nextSum = LDM_updateRollingHash( - cctx->lastSum, LDM_HASH_LENGTH, - (schar)((cctx->lastPosHashed)[0]), - (schar)((cctx->lastPosHashed)[LDM_HASH_LENGTH])); - -#ifdef RUN_CHECKS - check = LDM_getRollingHash((const char *)cctx->nextIp, LDM_HASH_LENGTH); - - if (check != cctx->nextSum) { - printf("CHECK: setNextHash failed %u %u\n", check, cctx->nextSum); -// printf("INFO: %u %u %u\n", LDM_read32(cctx->nextIp), - } -#endif - cctx->nextPosHashed = cctx->nextIp; - cctx->nextHash = LDM_sumToHash(cctx->nextSum); - -#ifdef RUN_CHECKS - if ((cctx->nextIp - cctx->lastPosHashed) != 1) { - printf("setNextHash: nextIp != lastPosHashed + 1. %zu %zu %zu\n", - cctx->nextIp - cctx->ibase, cctx->lastPosHashed - cctx->ibase, - cctx->ip - cctx->ibase); - } -#endif - -} - -static void LDM_putHashOfCurrentPositionFromHash( - LDM_CCtx *cctx, hash_t hash, U32 sum) { - /* - if (((cctx->ip - cctx->ibase) & HASH_EVERY) != HASH_EVERY) { - return; - } - */ -#ifdef COMPUTE_STATS - if (cctx->stats.numHashInserts < LDM_HASHTABLESIZE_U32) { - offset_t offset = (cctx->hashTable)[hash].offset; - cctx->stats.numHashInserts++; - if (offset == 0 && !LDM_isValidMatch(cctx->ip, offset + cctx->ibase)) { - cctx->stats.numCollisions++; - } - } -#endif - (cctx->hashTable)[hash] = (LDM_hashEntry){ (hash_t)(cctx->ip - cctx->ibase) }; - cctx->lastPosHashed = cctx->ip; - cctx->lastHash = hash; - cctx->lastSum = sum; -} - -static void LDM_updateLastHashFromNextHash(LDM_CCtx *cctx) { -#ifdef RUN_CHECKS - if (cctx->ip != cctx->nextPosHashed) { - printf("CHECK failed: updateLastHashFromNextHash %zu\n", cctx->ip - cctx->ibase); - } -#endif - LDM_putHashOfCurrentPositionFromHash(cctx, cctx->nextHash, cctx->nextSum); -} - -static void LDM_putHashOfCurrentPosition(LDM_CCtx *cctx) { - U32 sum = LDM_getRollingHash((const char *)cctx->ip, LDM_HASH_LENGTH); - hash_t hash = LDM_sumToHash(sum); -#ifdef RUN_CHECKS - if (cctx->nextPosHashed != cctx->ip && (cctx->ip != cctx->ibase)) { - printf("CHECK failed: putHashOfCurrentPosition %zu\n", cctx->ip - cctx->ibase); - } -#endif -// hash_t hash = LDM_hashPosition(cctx->ip); - LDM_putHashOfCurrentPositionFromHash(cctx, hash, sum); -// printf("Offset %zu\n", cctx->ip - cctx->ibase); -} - -#else -static hash_t LDM_hash(U32 sequence) { - return ((sequence * 2654435761U) >> ((32)-LDM_HASHLOG)); -} - -static hash_t LDM_hashPosition(const void * const p) { - return LDM_hash(LDM_read32(p)); -} - -static void LDM_putHashOfCurrentPositionFromHash( - LDM_CCtx *cctx, hash_t hash) { - /* - if (((cctx->ip - cctx->ibase) & HASH_EVERY) != HASH_EVERY) { - return; - } - */ -#ifdef COMPUTE_STATS - if (cctx->stats.numHashInserts < LDM_HASHTABLESIZE_U32) { - offset_t offset = (cctx->hashTable)[hash].offset; - cctx->stats.numHashInserts++; - if (offset == 0 && !LDM_isValidMatch(cctx->ip, offset + cctx->ibase)) { - cctx->stats.numCollisions++; - } - } -#endif - - (cctx->hashTable)[hash] = (LDM_hashEntry){ (hash_t)(cctx->ip - cctx->ibase) }; -#ifdef RUN_CHECKS - if (cctx->ip - cctx->lastPosHashed != 1) { - printf("putHashError\n"); - } -#endif - cctx->lastPosHashed = cctx->ip; - cctx->lastHash = hash; -} - -static void LDM_putHashOfCurrentPosition(LDM_CCtx *cctx) { - hash_t hash = LDM_hashPosition(cctx->ip); - LDM_putHashOfCurrentPositionFromHash(cctx, hash); -} - -#endif - -/* -static hash_t LDM_hash5(U64 sequence) { - static const U64 prime5bytes = 889523592379ULL; - static const U64 prime8bytes = 11400714785074694791ULL; - const U32 hashLog = LDM_HASHLOG; - if (LDM_isLittleEndian()) - return (((sequence << 24) * prime5bytes) >> (64 - hashLog)); - else - return (((sequence >> 24) * prime8bytes) >> (64 - hashLog)); -} -*/ - - -static const BYTE *LDM_getPositionOnHash( - hash_t h, void *tableBase, const BYTE *srcBase) { - const LDM_hashEntry * const hashTable = (LDM_hashEntry *)tableBase; - return hashTable[h].offset + srcBase; -} - - -static unsigned LDM_count(const BYTE *pIn, const BYTE *pMatch, - const BYTE *pInLimit) { - const BYTE * const pStart = pIn; - while (pIn < pInLimit - 1) { - BYTE const diff = LDM_readByte(pMatch) ^ LDM_readByte(pIn); - if (!diff) { - pIn++; - pMatch++; - continue; - } - return (unsigned)(pIn - pStart); - } - return (unsigned)(pIn - pStart); -} - -void LDM_readHeader(const void *src, size_t *compressSize, - size_t *decompressSize) { - const U32 *ip = (const U32 *)src; - *compressSize = *ip++; - *decompressSize = *ip; -} - -static void LDM_initializeCCtx(LDM_CCtx *cctx, - const void *src, size_t srcSize, - void *dst, size_t maxDstSize) { - cctx->isize = srcSize; - cctx->maxOSize = maxDstSize; - - cctx->ibase = (const BYTE *)src; - cctx->ip = cctx->ibase; - cctx->iend = cctx->ibase + srcSize; - -#ifdef LDM_ROLLING_HASH - cctx->ihashLimit = cctx->iend - LDM_HASH_LENGTH; -#else - cctx->ihashLimit = cctx->iend - HASH_SIZE; -#endif - cctx->imatchLimit = cctx->iend - MINMATCH; - - cctx->obase = (BYTE *)dst; - cctx->op = (BYTE *)dst; - - cctx->anchor = cctx->ibase; - - memset(&(cctx->stats), 0, sizeof(cctx->stats)); - memset(cctx->hashTable, 0, sizeof(cctx->hashTable)); - - cctx->lastPosHashed = NULL; - - cctx->step = 1; - cctx->nextIp = cctx->ip + cctx->step; - cctx->nextPosHashed = 0; - - cctx->DEBUG_setNextHash = 0; -} - -#ifdef LDM_ROLLING_HASH -static int LDM_findBestMatch(LDM_CCtx *cctx, const BYTE **match) { - cctx->nextIp = cctx->ip + cctx->step; - - do { - hash_t h; - U32 sum; -// printf("Call A\n"); - LDM_setNextHash(cctx); -// printf("End call a\n"); - h = cctx->nextHash; - sum = cctx->nextSum; - cctx->ip = cctx->nextIp; - cctx->nextIp += cctx->step; - - if (cctx->ip > cctx->imatchLimit) { - return 1; - } - - *match = LDM_getPositionOnHash(h, cctx->hashTable, cctx->ibase); - -// // Compute cctx->nextSum and cctx->nextHash from cctx->nextIp. -// LDM_setNextHash(cctx); - LDM_putHashOfCurrentPositionFromHash(cctx, h, sum); - -// printf("%u %u\n", cctx->lastHash, cctx->nextHash); - } while (cctx->ip - *match > WINDOW_SIZE || - !LDM_isValidMatch(cctx->ip, *match)); -// LDM_read64(*match) != LDM_read64(cctx->ip)); - LDM_setNextHash(cctx); - return 0; -} -#else -static int LDM_findBestMatch(LDM_CCtx *cctx, const BYTE **match) { - cctx->nextIp = cctx->ip; - - do { - hash_t const h = cctx->nextHash; - cctx->ip = cctx->nextIp; - cctx->nextIp += cctx->step; - - if (cctx->ip > cctx->imatchLimit) { - return 1; - } - - *match = LDM_getPositionOnHash(h, cctx->hashTable, cctx->ibase); - - cctx->nextHash = LDM_hashPosition(cctx->nextIp); - LDM_putHashOfCurrentPositionFromHash(cctx, h); - - } while (cctx->ip - *match > WINDOW_SIZE || - !LDM_isValidMatch(cctx->ip, *match)); - return 0; -} - -#endif - -/** - * Write current block (literals, literal length, match offset, - * match length). - * - * Update input pointer, inserting hashes into hash table along the - * way. - */ -static void LDM_outputBlock(LDM_CCtx *cctx, const BYTE *match) { - unsigned const literalLength = (unsigned)(cctx->ip - cctx->anchor); - unsigned const offset = cctx->ip - match; - unsigned const matchLength = LDM_count( - cctx->ip + MINMATCH, match + MINMATCH, cctx->ihashLimit); - BYTE *token = cctx->op++; - - cctx->stats.totalLiteralLength += literalLength; - cctx->stats.totalOffset += offset; - cctx->stats.totalMatchLength += matchLength + MINMATCH; - - /* Encode the literal length. */ - if (literalLength >= RUN_MASK) { - int len = (int)literalLength - RUN_MASK; - *token = (RUN_MASK << ML_BITS); - for (; len >= 255; len -= 255) { - *(cctx->op)++ = 255; - } - *(cctx->op)++ = (BYTE)len; - } else { - *token = (BYTE)(literalLength << ML_BITS); - } - - /* Encode the literals. */ - memcpy(cctx->op, cctx->anchor, literalLength); - cctx->op += literalLength; - - /* Encode the offset. */ - LDM_write32(cctx->op, offset); - cctx->op += LDM_OFFSET_SIZE; - - /* Encode match length */ - if (matchLength >= ML_MASK) { - unsigned matchLengthRemaining = matchLength; - *token += ML_MASK; - matchLengthRemaining -= ML_MASK; - LDM_write32(cctx->op, 0xFFFFFFFF); - while (matchLengthRemaining >= 4*0xFF) { - cctx->op += 4; - LDM_write32(cctx->op, 0xffffffff); - matchLengthRemaining -= 4*0xFF; - } - cctx->op += matchLengthRemaining / 255; - *(cctx->op)++ = (BYTE)(matchLengthRemaining % 255); - } else { - *token += (BYTE)(matchLength); - } - -// LDM_setNextHash(cctx); -// cctx->ip = cctx->lastPosHashed + 1; -// cctx->nextIp = cctx->ip + cctx->step; -// printf("HERE: %zu %zu %zu\n", cctx->ip - cctx->ibase, -// cctx->lastPosHashed - cctx->ibase, cctx->nextIp - cctx->ibase); - - cctx->nextIp = cctx->ip + cctx->step; - - while (cctx->ip < cctx->anchor + MINMATCH + matchLength + literalLength) { -// printf("Loop\n"); - if (cctx->ip > cctx->lastPosHashed) { - LDM_updateLastHashFromNextHash(cctx); -// LDM_putHashOfCurrentPosition(cctx); -#ifdef LDM_ROLLING_HASH - LDM_setNextHash(cctx); -#endif - } - /* - printf("Call b %zu %zu %zu\n", - cctx->lastPosHashed - cctx->ibase, - cctx->nextIp - cctx->ibase, - cctx->ip - cctx->ibase); - */ -// printf("end call b\n"); - cctx->ip++; - cctx->nextIp++; - } - -// printf("There: %zu %zu\n", cctx->ip - cctx->ibase, cctx->lastPosHashed - cctx->ibase); -} - -// TODO: srcSize and maxDstSize is unused -size_t LDM_compress(const void *src, size_t srcSize, - void *dst, size_t maxDstSize) { - LDM_CCtx cctx; - LDM_initializeCCtx(&cctx, src, srcSize, dst, maxDstSize); - - /* Hash the first position and put it into the hash table. */ - LDM_putHashOfCurrentPosition(&cctx); -#ifdef LDM_ROLLING_HASH -// LDM_setNextHash(&cctx); -// tmp_hash = LDM_updateRollingHash(cctx.lastSum, LDM_HASH_LENGTH, -// cctx.ip[0], cctx.ip[LDM_HASH_LENGTH]); -// printf("Update test: %u %u\n", tmp_hash, cctx.nextSum); -// cctx.ip++; -#else - cctx.ip++; - cctx.nextHash = LDM_hashPosition(cctx.ip); -#endif - - // TODO: loop condition is not accurate. - while (1) { - const BYTE *match; -// printf("Start of loop\n"); - - /** - * Find a match. - * If no more matches can be found (i.e. the length of the remaining input - * is less than the minimum match length), then stop searching for matches - * and encode the final literals. - */ - if (LDM_findBestMatch(&cctx, &match) != 0) { - goto _last_literals; - } -// printf("End of match finding\n"); - - cctx.stats.numMatches++; - - /** - * Catch up: look back to extend the match backwards from the found match. - */ - while (cctx.ip > cctx.anchor && match > cctx.ibase && - cctx.ip[-1] == match[-1]) { -// printf("Catch up\n"); - cctx.ip--; - match--; - } - - /** - * Write current block (literals, literal length, match offset, match - * length) and update pointers and hashes. - */ - LDM_outputBlock(&cctx, match); -// printf("End of loop\n"); - - // Set start of next block to current input pointer. - cctx.anchor = cctx.ip; - LDM_updateLastHashFromNextHash(&cctx); -// LDM_putHashOfCurrentPosition(&cctx); -#ifndef LDM_ROLLING_HASH - cctx.ip++; -#endif - - /* - LDM_putHashOfCurrentPosition(&cctx); - printf("Call c\n"); - LDM_setNextHash(&cctx); - printf("End call c\n"); - cctx.ip++; - cctx.nextIp++; - */ - } -_last_literals: - /* Encode the last literals (no more matches). */ - { - size_t const lastRun = (size_t)(cctx.iend - cctx.anchor); - if (lastRun >= RUN_MASK) { - size_t accumulator = lastRun - RUN_MASK; - *(cctx.op)++ = RUN_MASK << ML_BITS; - for(; accumulator >= 255; accumulator -= 255) { - *(cctx.op)++ = 255; - } - *(cctx.op)++ = (BYTE)accumulator; - } else { - *(cctx.op)++ = (BYTE)(lastRun << ML_BITS); - } - memcpy(cctx.op, cctx.anchor, lastRun); - cctx.op += lastRun; - } - LDM_printCompressStats(&cctx.stats); - return (cctx.op - (const BYTE *)cctx.obase); -} - -typedef struct LDM_DCtx { - size_t compressSize; - size_t maxDecompressSize; - - const BYTE *ibase; /* Base of input */ - const BYTE *ip; /* Current input position */ - const BYTE *iend; /* End of source */ - - const BYTE *obase; /* Base of output */ - BYTE *op; /* Current output position */ - const BYTE *oend; /* End of output */ -} LDM_DCtx; - -static void LDM_initializeDCtx(LDM_DCtx *dctx, - const void *src, size_t compressSize, - void *dst, size_t maxDecompressSize) { - dctx->compressSize = compressSize; - dctx->maxDecompressSize = maxDecompressSize; - - dctx->ibase = src; - dctx->ip = (const BYTE *)src; - dctx->iend = dctx->ip + dctx->compressSize; - dctx->op = dst; - dctx->oend = dctx->op + dctx->maxDecompressSize; - -} - -size_t LDM_decompress(const void *src, size_t compressSize, - void *dst, size_t maxDecompressSize) { - LDM_DCtx dctx; - LDM_initializeDCtx(&dctx, src, compressSize, dst, maxDecompressSize); - - while (dctx.ip < dctx.iend) { - BYTE *cpy; - const BYTE *match; - size_t length, offset; - - /* Get the literal length. */ - unsigned const token = *(dctx.ip)++; - if ((length = (token >> ML_BITS)) == RUN_MASK) { - unsigned s; - do { - s = *(dctx.ip)++; - length += s; - } while (s == 255); - } - - /* Copy literals. */ - cpy = dctx.op + length; - memcpy(dctx.op, dctx.ip, length); - dctx.ip += length; - dctx.op = cpy; - - //TODO : dynamic offset size - offset = LDM_read32(dctx.ip); - dctx.ip += LDM_OFFSET_SIZE; - match = dctx.op - offset; - - /* Get the match length. */ - length = token & ML_MASK; - if (length == ML_MASK) { - unsigned s; - do { - s = *(dctx.ip)++; - length += s; - } while (s == 255); - } - length += MINMATCH; - - /* Copy match. */ - cpy = dctx.op + length; - - // Inefficient for now. - while (match < cpy - offset && dctx.op < dctx.oend) { - *(dctx.op)++ = *match++; - } - } - return dctx.op - (BYTE *)dst; -} - -void LDM_test(const void *src, size_t srcSize, - void *dst, size_t maxDstSize) { -#ifdef LDM_ROLLING_HASH - const BYTE *ip = (const BYTE *)src + 1125; - U32 sum = LDM_getRollingHash((const char *)ip, LDM_HASH_LENGTH); - U32 sum2; - ++ip; - for (; ip < (const BYTE *)src + 1125 + 100; ip++) { - sum2 = LDM_updateRollingHash(sum, LDM_HASH_LENGTH, - ip[-1], ip[LDM_HASH_LENGTH - 1]); - sum = LDM_getRollingHash((const char *)ip, LDM_HASH_LENGTH); - printf("TEST HASH: %zu %u %u\n", ip - (const BYTE *)src, sum, sum2); - } -#endif -} - - diff --git a/contrib/long_distance_matching/versions/v0.4/ldm.h b/contrib/long_distance_matching/versions/v0.4/ldm.h deleted file mode 100644 index a34faac4..00000000 --- a/contrib/long_distance_matching/versions/v0.4/ldm.h +++ /dev/null @@ -1,22 +0,0 @@ -#ifndef LDM_H -#define LDM_H - -#include /* size_t */ - -#define LDM_COMPRESS_SIZE 4 -#define LDM_DECOMPRESS_SIZE 4 -#define LDM_HEADER_SIZE ((LDM_COMPRESS_SIZE)+(LDM_DECOMPRESS_SIZE)) - -size_t LDM_compress(const void *src, size_t srcSize, - void *dst, size_t maxDstSize); - -size_t LDM_decompress(const void *src, size_t srcSize, - void *dst, size_t maxDstSize); - -void LDM_readHeader(const void *src, size_t *compressSize, - size_t *decompressSize); - -void LDM_test(const void *src, size_t srcSize, - void *dst, size_t maxDstSize); - -#endif /* LDM_H */ diff --git a/contrib/long_distance_matching/versions/v0.4/main-ldm.c b/contrib/long_distance_matching/versions/v0.4/main-ldm.c deleted file mode 100644 index f8ae5469..00000000 --- a/contrib/long_distance_matching/versions/v0.4/main-ldm.c +++ /dev/null @@ -1,480 +0,0 @@ -// TODO: file size must fit into a U32 - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include "ldm.h" - -// #define BUF_SIZE 16*1024 // Block size -#define DEBUG -//#define TEST - -//#define ZSTD - -/* Compress file given by fname and output to oname. - * Returns 0 if successful, error code otherwise. - */ -static int compress(const char *fname, const char *oname) { - int fdin, fdout; - struct stat statbuf; - char *src, *dst; - size_t maxCompressSize, compressSize; - - /* Open the input file. */ - if ((fdin = open(fname, O_RDONLY)) < 0) { - perror("Error in file opening"); - return 1; - } - - /* Open the output file. */ - if ((fdout = open(oname, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600)) < 0) { - perror("Can't create output file"); - return 1; - } - - /* Find the size of the input file. */ - if (fstat (fdin, &statbuf) < 0) { - perror("Fstat error"); - return 1; - } - - maxCompressSize = statbuf.st_size + LDM_HEADER_SIZE; - - /* Go to the location corresponding to the last byte. */ - /* TODO: fallocate? */ - if (lseek(fdout, maxCompressSize - 1, SEEK_SET) == -1) { - perror("lseek error"); - return 1; - } - - /* Write a dummy byte at the last location. */ - if (write(fdout, "", 1) != 1) { - perror("write error"); - return 1; - } - - /* mmap the input file. */ - if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0)) - == (caddr_t) - 1) { - perror("mmap error for input"); - return 1; - } - - /* mmap the output file */ - if ((dst = mmap(0, maxCompressSize, PROT_READ | PROT_WRITE, - MAP_SHARED, fdout, 0)) == (caddr_t) - 1) { - perror("mmap error for output"); - return 1; - } - -#ifdef TEST - LDM_test(src, statbuf.st_size, - dst + LDM_HEADER_SIZE, statbuf.st_size); -#endif - -#ifdef ZSTD - compressSize = ZSTD_compress(dst, statbuf.st_size, - src, statbuf.st_size, 1); -#else - compressSize = LDM_HEADER_SIZE + - LDM_compress(src, statbuf.st_size, - dst + LDM_HEADER_SIZE, statbuf.st_size); - - // Write compress and decompress size to header - // TODO: should depend on LDM_DECOMPRESS_SIZE write32 - memcpy(dst, &compressSize, 4); - memcpy(dst + 4, &(statbuf.st_size), 4); - -#ifdef DEBUG - printf("Compressed size: %zu\n", compressSize); - printf("Decompressed size: %zu\n", (size_t)statbuf.st_size); -#endif -#endif - - // Truncate file to compressSize. - ftruncate(fdout, compressSize); - - printf("%25s : %6u -> %7u - %s (%.1f%%)\n", fname, - (unsigned)statbuf.st_size, (unsigned)compressSize, oname, - (double)compressSize / (statbuf.st_size) * 100); - - // Close files. - close(fdin); - close(fdout); - return 0; -} - -/* Decompress file compressed using LDM_compress. - * The input file should have the LDM_HEADER followed by payload. - * Returns 0 if succesful, and an error code otherwise. - */ -static int decompress(const char *fname, const char *oname) { - int fdin, fdout; - struct stat statbuf; - char *src, *dst; - size_t compressSize, decompressSize, outSize; - - /* Open the input file. */ - if ((fdin = open(fname, O_RDONLY)) < 0) { - perror("Error in file opening"); - return 1; - } - - /* Open the output file. */ - if ((fdout = open(oname, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600)) < 0) { - perror("Can't create output file"); - return 1; - } - - /* Find the size of the input file. */ - if (fstat (fdin, &statbuf) < 0) { - perror("Fstat error"); - return 1; - } - - /* mmap the input file. */ - if ((src = mmap(0, statbuf.st_size, PROT_READ, MAP_SHARED, fdin, 0)) - == (caddr_t) - 1) { - perror("mmap error for input"); - return 1; - } - - /* Read the header. */ - LDM_readHeader(src, &compressSize, &decompressSize); - - /* Go to the location corresponding to the last byte. */ - if (lseek(fdout, decompressSize - 1, SEEK_SET) == -1) { - perror("lseek error"); - return 1; - } - - /* write a dummy byte at the last location */ - if (write(fdout, "", 1) != 1) { - perror("write error"); - return 1; - } - - /* mmap the output file */ - if ((dst = mmap(0, decompressSize, PROT_READ | PROT_WRITE, - MAP_SHARED, fdout, 0)) == (caddr_t) - 1) { - perror("mmap error for output"); - return 1; - } - -#ifdef ZSTD - outSize = ZSTD_decompress(dst, decomrpessed_size, - src + LDM_HEADER_SIZE, - statbuf.st_size - LDM_HEADER_SIZE); -#else - outSize = LDM_decompress( - src + LDM_HEADER_SIZE, statbuf.st_size - LDM_HEADER_SIZE, - dst, decompressSize); - - printf("Ret size out: %zu\n", outSize); - #endif - ftruncate(fdout, outSize); - - close(fdin); - close(fdout); - return 0; -} - -/* Compare two files. - * Returns 0 iff they are the same. - */ -static int compare(FILE *fp0, FILE *fp1) { - int result = 0; - while (result == 0) { - char b0[1024]; - char b1[1024]; - const size_t r0 = fread(b0, 1, sizeof(b0), fp0); - const size_t r1 = fread(b1, 1, sizeof(b1), fp1); - - result = (int)r0 - (int)r1; - - if (0 == r0 || 0 == r1) break; - - if (0 == result) result = memcmp(b0, b1, r0); - } - return result; -} - -/* Verify the input file is the same as the decompressed file. */ -static void verify(const char *inpFilename, const char *decFilename) { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *decFp = fopen(decFilename, "rb"); - - printf("verify : %s <-> %s\n", inpFilename, decFilename); - { - const int cmp = compare(inpFp, decFp); - if(0 == cmp) { - printf("verify : OK\n"); - } else { - printf("verify : NG\n"); - } - } - - fclose(decFp); - fclose(inpFp); -} - -int main(int argc, const char *argv[]) { - const char * const exeName = argv[0]; - char inpFilename[256] = { 0 }; - char ldmFilename[256] = { 0 }; - char decFilename[256] = { 0 }; - - if (argc < 2) { - printf("Wrong arguments\n"); - printf("Usage:\n"); - printf("%s FILE\n", exeName); - return 1; - } - - snprintf(inpFilename, 256, "%s", argv[1]); - snprintf(ldmFilename, 256, "%s.ldm", argv[1]); - snprintf(decFilename, 256, "%s.ldm.dec", argv[1]); - - printf("inp = [%s]\n", inpFilename); - printf("ldm = [%s]\n", ldmFilename); - printf("dec = [%s]\n", decFilename); - - - /* Compress */ - { - struct timeval tv1, tv2; - gettimeofday(&tv1, NULL); - if (compress(inpFilename, ldmFilename)) { - printf("Compress error"); - return 1; - } - gettimeofday(&tv2, NULL); - printf("Total compress time = %f seconds\n", - (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 + - (double) (tv2.tv_sec - tv1.tv_sec)); - } - - /* Decompress */ - { - struct timeval tv1, tv2; - gettimeofday(&tv1, NULL); - if (decompress(ldmFilename, decFilename)) { - printf("Decompress error"); - return 1; - } - gettimeofday(&tv2, NULL); - printf("Total decompress time = %f seconds\n", - (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 + - (double) (tv2.tv_sec - tv1.tv_sec)); - } - /* verify */ - verify(inpFilename, decFilename); - return 0; -} - - -#if 0 -static size_t compress_file(FILE *in, FILE *out, size_t *size_in, - size_t *size_out) { - char *src, *buf = NULL; - size_t r = 1; - size_t size, n, k, count_in = 0, count_out = 0, offset, frame_size = 0; - - src = malloc(BUF_SIZE); - if (!src) { - printf("Not enough memory\n"); - goto cleanup; - } - - size = BUF_SIZE + LDM_HEADER_SIZE; - buf = malloc(size); - if (!buf) { - printf("Not enough memory\n"); - goto cleanup; - } - - - for (;;) { - k = fread(src, 1, BUF_SIZE, in); - if (k == 0) - break; - count_in += k; - - n = LDM_compress(src, buf, k, BUF_SIZE); - - // n = k; - // offset += n; - offset = k; - count_out += k; - -// k = fwrite(src, 1, offset, out); - - k = fwrite(buf, 1, offset, out); - if (k < offset) { - if (ferror(out)) - printf("Write failed\n"); - else - printf("Short write\n"); - goto cleanup; - } - - } - *size_in = count_in; - *size_out = count_out; - r = 0; - cleanup: - free(src); - free(buf); - return r; -} - -static size_t decompress_file(FILE *in, FILE *out) { - void *src = malloc(BUF_SIZE); - void *dst = NULL; - size_t dst_capacity = BUF_SIZE; - size_t ret = 1; - size_t bytes_written = 0; - - if (!src) { - perror("decompress_file(src)"); - goto cleanup; - } - - while (ret != 0) { - /* Load more input */ - size_t src_size = fread(src, 1, BUF_SIZE, in); - void *src_ptr = src; - void *src_end = src_ptr + src_size; - if (src_size == 0 || ferror(in)) { - printf("(TODO): Decompress: not enough input or error reading file\n"); - //TODO - ret = 0; - goto cleanup; - } - - /* Allocate destination buffer if it hasn't been allocated already */ - if (!dst) { - dst = malloc(dst_capacity); - if (!dst) { - perror("decompress_file(dst)"); - goto cleanup; - } - } - - // TODO - - /* Decompress: - * Continue while there is more input to read. - */ - while (src_ptr != src_end && ret != 0) { - // size_t dst_size = src_size; - size_t dst_size = LDM_decompress(src, dst, src_size, dst_capacity); - size_t written = fwrite(dst, 1, dst_size, out); -// printf("Writing %zu bytes\n", dst_size); - bytes_written += dst_size; - if (written != dst_size) { - printf("Decompress: Failed to write to file\n"); - goto cleanup; - } - src_ptr += src_size; - src_size = src_end - src_ptr; - } - - /* Update input */ - - } - - printf("Wrote %zu bytes\n", bytes_written); - - cleanup: - free(src); - free(dst); - - return ret; -} - -int main2(int argc, char *argv[]) { - char inpFilename[256] = { 0 }; - char ldmFilename[256] = { 0 }; - char decFilename[256] = { 0 }; - - if (argc < 2) { - printf("Please specify input filename\n"); - return 0; - } - snprintf(inpFilename, 256, "%s", argv[1]); - snprintf(ldmFilename, 256, "%s.ldm", argv[1]); - snprintf(decFilename, 256, "%s.ldm.dec", argv[1]); - - printf("inp = [%s]\n", inpFilename); - printf("ldm = [%s]\n", ldmFilename); - printf("dec = [%s]\n", decFilename); - - /* compress */ - { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *outFp = fopen(ldmFilename, "wb"); - size_t sizeIn = 0; - size_t sizeOut = 0; - size_t ret; - printf("compress : %s -> %s\n", inpFilename, ldmFilename); - ret = compress_file(inpFp, outFp, &sizeIn, &sizeOut); - if (ret) { - printf("compress : failed with code %zu\n", ret); - return ret; - } - printf("%s: %zu → %zu bytes, %.1f%%\n", - inpFilename, sizeIn, sizeOut, - (double)sizeOut / sizeIn * 100); - printf("compress : done\n"); - - fclose(outFp); - fclose(inpFp); - } - - /* decompress */ - { - FILE *inpFp = fopen(ldmFilename, "rb"); - FILE *outFp = fopen(decFilename, "wb"); - size_t ret; - - printf("decompress : %s -> %s\n", ldmFilename, decFilename); - ret = decompress_file(inpFp, outFp); - if (ret) { - printf("decompress : failed with code %zu\n", ret); - return ret; - } - printf("decompress : done\n"); - - fclose(outFp); - fclose(inpFp); - } - - /* verify */ - { - FILE *inpFp = fopen(inpFilename, "rb"); - FILE *decFp = fopen(decFilename, "rb"); - - printf("verify : %s <-> %s\n", inpFilename, decFilename); - const int cmp = compare(inpFp, decFp); - if(0 == cmp) { - printf("verify : OK\n"); - } else { - printf("verify : NG\n"); - } - - fclose(decFp); - fclose(inpFp); - } - return 0; -} -#endif - diff --git a/contrib/long_distance_matching/versions/v0.4/util.c b/contrib/long_distance_matching/versions/v0.4/util.c deleted file mode 100644 index 70fcbc2c..00000000 --- a/contrib/long_distance_matching/versions/v0.4/util.c +++ /dev/null @@ -1,69 +0,0 @@ -#include -#include -#include -#include - -#include "util.h" - -typedef uint8_t BYTE; -typedef uint16_t U16; -typedef uint32_t U32; -typedef int32_t S32; -typedef uint64_t U64; - -unsigned LDM_isLittleEndian(void) { - const union { U32 u; BYTE c[4]; } one = { 1 }; - return one.c[0]; -} - -U16 LDM_read16(const void *memPtr) { - U16 val; - memcpy(&val, memPtr, sizeof(val)); - return val; -} - -U16 LDM_readLE16(const void *memPtr) { - if (LDM_isLittleEndian()) { - return LDM_read16(memPtr); - } else { - const BYTE *p = (const BYTE *)memPtr; - return (U16)((U16)p[0] + (p[1] << 8)); - } -} - -void LDM_write16(void *memPtr, U16 value){ - memcpy(memPtr, &value, sizeof(value)); -} - -void LDM_write32(void *memPtr, U32 value) { - memcpy(memPtr, &value, sizeof(value)); -} - -void LDM_writeLE16(void *memPtr, U16 value) { - if (LDM_isLittleEndian()) { - LDM_write16(memPtr, value); - } else { - BYTE* p = (BYTE *)memPtr; - p[0] = (BYTE) value; - p[1] = (BYTE)(value>>8); - } -} - -U32 LDM_read32(const void *ptr) { - return *(const U32 *)ptr; -} - -U64 LDM_read64(const void *ptr) { - return *(const U64 *)ptr; -} - -void LDM_copy8(void *dst, const void *src) { - memcpy(dst, src, 8); -} - -BYTE LDM_readByte(const void *memPtr) { - BYTE val; - memcpy(&val, memPtr, 1); - return val; -} - diff --git a/contrib/long_distance_matching/versions/v0.4/util.h b/contrib/long_distance_matching/versions/v0.4/util.h deleted file mode 100644 index d1c3c999..00000000 --- a/contrib/long_distance_matching/versions/v0.4/util.h +++ /dev/null @@ -1,25 +0,0 @@ -#ifndef LDM_UTIL_H -#define LDM_UTIL_H - -unsigned LDM_isLittleEndian(void); - -uint16_t LDM_read16(const void *memPtr); - -uint16_t LDM_readLE16(const void *memPtr); - -void LDM_write16(void *memPtr, uint16_t value); - -void LDM_write32(void *memPtr, uint32_t value); - -void LDM_writeLE16(void *memPtr, uint16_t value); - -uint32_t LDM_read32(const void *ptr); - -uint64_t LDM_read64(const void *ptr); - -void LDM_copy8(void *dst, const void *src); - -uint8_t LDM_readByte(const void *ptr); - - -#endif /* LDM_UTIL_H */ diff --git a/contrib/long_distance_matching/versions/v0.5/Makefile b/contrib/long_distance_matching/versions/v0.5/Makefile index 5ffd4eaf..fa4abce6 100644 --- a/contrib/long_distance_matching/versions/v0.5/Makefile +++ b/contrib/long_distance_matching/versions/v0.5/Makefile @@ -1,12 +1,3 @@ -# ################################################################ -# Copyright (c) 2016-present, Yann Collet, Facebook, Inc. -# All rights reserved. -# -# This source code is licensed under the BSD-style license found in the -# LICENSE file in the root directory of this source tree. An additional grant -# of patent rights can be found in the PATENTS file in the same directory. -# ################################################################ - # This Makefile presumes libzstd is installed, using `sudo make install` CFLAGS ?= -O3 @@ -26,15 +17,11 @@ default: all all: main-ldm - -#main : ldm.c main.c -# $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ - main-ldm : util.c ldm.c main-ldm.c $(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@ clean: @rm -f core *.o tmp* result* *.ldm *.ldm.dec \ - main main-ldm + main-ldm @echo Cleaning completed diff --git a/contrib/long_distance_matching/versions/v0.5/README b/contrib/long_distance_matching/versions/v0.5/README new file mode 100644 index 00000000..7901ae76 --- /dev/null +++ b/contrib/long_distance_matching/versions/v0.5/README @@ -0,0 +1,5 @@ +This version uses simple lz4-style compression with a rolling hash. +- A rolling checksum based on rsync's Adler-32 style checksum is used. +- The checksum is hashed using lz4's hash function. +- Hash table replacement policy: direct overwrite. +- The length of input to the hash function can be set with LDM_HASH_LENGTH. diff --git a/contrib/long_distance_matching/versions/v0.5/ldm.c b/contrib/long_distance_matching/versions/v0.5/ldm.c index 325c5040..5fa20c06 100644 --- a/contrib/long_distance_matching/versions/v0.5/ldm.c +++ b/contrib/long_distance_matching/versions/v0.5/ldm.c @@ -19,8 +19,8 @@ #define WINDOW_SIZE (1 << 20) //These should be multiples of four. -#define LDM_HASH_LENGTH 100 -#define MINMATCH 100 +#define LDM_HASH_LENGTH 4 +#define MINMATCH 4 #define ML_BITS 4 #define ML_MASK ((1U<stats); -#ifdef COMPUTE_STATS printf("=====================\n"); printf("Compression statistics\n"); printf("Total number of matches: %u\n", stats->numMatches); @@ -131,8 +131,8 @@ static void printCompressStats(const LDM_CCtx *cctx) { } printf("=====================\n"); -#endif } +#endif /** * Checks whether the MINMATCH bytes from p are the same as the MINMATCH