edit README.md and remove simple_compressionCCtx.c
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Yi Jin
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ea4859ec71
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examples/.gitignore
vendored
2
examples/.gitignore
vendored
@ -1,7 +1,7 @@
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#build
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simple_compression
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simple_decompression
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simple_compressionCCtx
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multiple_simple_compression
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dictionary_compression
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dictionary_decompression
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streaming_compression
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@ -17,7 +17,7 @@ LIB = ../lib/libzstd.a
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default: all
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all: simple_compression simple_decompression \
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simple_compressionCCtx\
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multiple_simple_compression\
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dictionary_compression dictionary_decompression \
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streaming_compression streaming_decompression \
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multiple_streaming_compression streaming_memory_usage
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@ -31,7 +31,7 @@ simple_compression : simple_compression.c utils.h $(LIB)
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simple_decompression : simple_decompression.c utils.h $(LIB)
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$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
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simple_compressionCCtx : simple_compressionCCtx.c utils.h $(LIB)
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multiple_simple_compression : multiple_simple_compression.c utils.h $(LIB)
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$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
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dictionary_compression : dictionary_compression.c utils.h $(LIB)
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@ -55,7 +55,7 @@ streaming_memory_usage : streaming_memory_usage.c $(LIB)
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clean:
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@rm -f core *.o tmp* result* *.zst \
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simple_compression simple_decompression \
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simple_compressionCCtx \
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multiple_simple_compression \
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dictionary_compression dictionary_decompression \
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streaming_compression streaming_decompression \
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multiple_streaming_compression streaming_memory_usage
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@ -67,7 +67,7 @@ test: all
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@echo -- Simple compression tests
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./simple_compression tmp
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./simple_decompression tmp.zst
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./simple_compressionCCtx *.c
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./multiple_simple_compression *.c
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./streaming_decompression tmp.zst > /dev/null
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@echo -- Streaming memory usage
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./streaming_memory_usage
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@ -11,8 +11,14 @@ Zstandard library : usage examples
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Result remains in memory.
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Introduces usage of : `ZSTD_decompress()`
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- [Multiple simple compression](multiple_simple_compression.c) :
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Compress multiple files (in simple mode) in a single command line.
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Demonstrates memory preservation technique that
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minimizes malloc()/free() calls by re-using existing resources.
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Introduces usage of : `ZSTD_compressCCtx()`
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- [Streaming memory usage](streaming_memory_usage.c) :
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Provides amount of memory used by streaming context
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Provides amount of memory used by streaming context.
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Introduces usage of : `ZSTD_sizeof_CStream()`
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- [Streaming compression](streaming_compression.c) :
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@ -20,7 +26,7 @@ Zstandard library : usage examples
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Introduces usage of : `ZSTD_compressStream()`
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- [Multiple Streaming compression](multiple_streaming_compression.c) :
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Compress multiple files in a single command line.
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Compress multiple files (in streaming mode) in a single command line.
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Introduces memory usage preservation technique,
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reducing impact of malloc()/free() and memset() by re-using existing resources.
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@ -1,115 +0,0 @@
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/*
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#include <stdlib.h> // malloc, free, exit
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#include <stdio.h> // fprintf, perror, fopen, etc.
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#include <string.h> // strlen, strcat, memset, strerror
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#include <errno.h> // errno
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#include <sys/stat.h> // stat
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#include <zstd.h> // presumes zstd library is installed
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#include "utils.h"
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/* compress with pre-allocated context (ZSTD_CCtx) and input/output buffers*/
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static void compressExpress_orDie(const char* fname, const char* oname,
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ZSTD_CCtx* cctx, void* cBuff, size_t cBuffSize, void* fBuff, size_t fBuffSize)
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{
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size_t fSize;
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loadFile_orDie(fname, &fSize, fBuff, fBuffSize);
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size_t const cSize = ZSTD_compressCCtx(cctx, cBuff, cBuffSize, fBuff, fSize, 1);
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if (ZSTD_isError(cSize)) {
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fprintf(stderr, "error compressing %s : %s \n", fname, ZSTD_getErrorName(cSize));
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exit(8);
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}
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saveFile_orDie(oname, cBuff, cSize);
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/* success */
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printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname);
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}
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static void getOutFilename(const char* const filename, char* const outFilename)
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{
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memset(outFilename, 0, 1);
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strcat(outFilename, filename);
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strcat(outFilename, ".zst");
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}
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/* allocate memory for buffers big enough to compress all files
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* as well as memory for output file names (outFileName)
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*/
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void allocMemory_orDie(int argc, const char** argv, char** outFilename,
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void** cBuffer, size_t* cBufferSize, void** fBuffer, size_t* fBufferSize) {
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size_t maxFilenameLength=0;
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size_t maxFileSize = 0;
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int argNb;
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for (argNb = 1; argNb < argc; argNb++) {
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const char* const filename = argv[argNb];
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size_t const filenameLength = strlen(filename);
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size_t const fileSize = fsize_orDie(filename);
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if (filenameLength > maxFilenameLength) maxFilenameLength = filenameLength;
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if (fileSize > maxFileSize) maxFileSize = fileSize;
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}
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*cBufferSize = ZSTD_compressBound(maxFileSize);
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*fBufferSize = maxFileSize;
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/* allocate memory for output file name, input/output buffers for all compression tasks */
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*outFilename = (char*)malloc_orDie(maxFilenameLength + 5);
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*cBuffer = malloc_orDie(*cBufferSize);
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*fBuffer = malloc_orDie(*fBufferSize);
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}
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int main(int argc, const char** argv)
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{
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const char* const exeName = argv[0];
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if (argc<2) {
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printf("wrong arguments\n");
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printf("usage:\n");
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printf("%s FILE(s)\n", exeName);
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return 1;
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}
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/* allocate memory for buffers big enough to compress all files
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* as well as memory for output file name (outFileName)
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* fBuffer - buffer for input file data
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* cBuffer - buffer for compressed data
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*/
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char* outFilename;
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void* fBuffer;
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void* cBuffer;
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size_t fBufferSize;
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size_t cBufferSize;
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allocMemory_orDie(argc, argv, &outFilename, &cBuffer, &cBufferSize, &fBuffer, &fBufferSize);
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/* create a compression context (ZSTD_CCtx) for all compression tasks */
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ZSTD_CCtx* const cctx = ZSTD_createCCtx();
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if (cctx==NULL) { fprintf(stderr, "ZSTD_createCCtx() error \n"); exit(10); }
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/* compress files with shared context, input and output buffers */
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int argNb;
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for (argNb = 1; argNb < argc; argNb++) {
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const char* const inFilename = argv[argNb];
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getOutFilename(inFilename, outFilename);
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compressExpress_orDie(inFilename, outFilename, cctx, cBuffer, cBufferSize, fBuffer, fBufferSize);
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}
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/* free momery resources */
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free(outFilename);
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free(fBuffer);
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free(cBuffer);
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ZSTD_freeCCtx(cctx); /* never fails */
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printf("compressed %i files \n", argc-1);
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return 0;
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}
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