142 lines
4.5 KiB
C
142 lines
4.5 KiB
C
/*
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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, feof, fopen, etc.
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#include <string.h> // strlen, memset, strcat
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#include <zstd.h> // presumes zstd library is installed
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static void* malloc_orDie(size_t size)
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{
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void* const buff = malloc(size);
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if (buff) return buff;
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/* error */
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perror("malloc:");
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exit(1);
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}
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static FILE* fopen_orDie(const char *filename, const char *instruction)
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{
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FILE* const inFile = fopen(filename, instruction);
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if (inFile) return inFile;
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/* error */
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perror(filename);
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exit(3);
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}
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static size_t fread_orDie(void* buffer, size_t sizeToRead, FILE* file)
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{
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size_t const readSize = fread(buffer, 1, sizeToRead, file);
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if (readSize == sizeToRead) return readSize; /* good */
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if (feof(file)) return readSize; /* good, reached end of file */
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/* error */
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perror("fread");
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exit(4);
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}
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static size_t fwrite_orDie(const void* buffer, size_t sizeToWrite, FILE* file)
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{
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size_t const writtenSize = fwrite(buffer, 1, sizeToWrite, file);
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if (writtenSize == sizeToWrite) return sizeToWrite; /* good */
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/* error */
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perror("fwrite");
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exit(5);
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}
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static size_t fclose_orDie(FILE* file)
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{
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if (!fclose(file)) return 0;
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/* error */
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perror("fclose");
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exit(6);
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}
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static void compressFile_orDie(const char* fname, const char* outName, int cLevel)
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{
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FILE* const fin = fopen_orDie(fname, "rb");
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FILE* const fout = fopen_orDie(outName, "wb");
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size_t const buffInSize = ZSTD_CStreamInSize(); /* can always read one full block */
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void* const buffIn = malloc_orDie(buffInSize);
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size_t const buffOutSize = ZSTD_CStreamOutSize(); /* can always flush a full block */
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void* const buffOut = malloc_orDie(buffOutSize);
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ZSTD_CStream* const cstream = ZSTD_createCStream();
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if (cstream==NULL) { fprintf(stderr, "ZSTD_createCStream() error \n"); exit(10); }
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size_t const initResult = ZSTD_initCStream(cstream, cLevel);
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if (ZSTD_isError(initResult)) {
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fprintf(stderr, "ZSTD_initCStream() error : %s \n",
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ZSTD_getErrorName(initResult));
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exit(11);
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}
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size_t read, toRead = buffInSize;
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while( (read = fread_orDie(buffIn, toRead, fin)) ) {
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ZSTD_inBuffer input = { buffIn, read, 0 };
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while (input.pos < input.size) {
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ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
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toRead = ZSTD_compressStream(cstream, &output , &input); /* toRead is guaranteed to be <= ZSTD_CStreamInSize() */
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if (ZSTD_isError(toRead)) {
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fprintf(stderr, "ZSTD_compressStream() error : %s \n",
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ZSTD_getErrorName(toRead));
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exit(12);
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}
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if (toRead > buffInSize) toRead = buffInSize; /* Safely handle case when `buffInSize` is manually changed to a value < ZSTD_CStreamInSize()*/
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fwrite_orDie(buffOut, output.pos, fout);
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}
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}
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ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
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size_t const remainingToFlush = ZSTD_endStream(cstream, &output); /* close frame */
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if (remainingToFlush) { fprintf(stderr, "not fully flushed"); exit(13); }
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fwrite_orDie(buffOut, output.pos, fout);
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ZSTD_freeCStream(cstream);
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fclose_orDie(fout);
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fclose_orDie(fin);
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free(buffIn);
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free(buffOut);
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}
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static char* createOutFilename_orDie(const char* filename)
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{
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size_t const inL = strlen(filename);
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size_t const outL = inL + 5;
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void* const outSpace = malloc_orDie(outL);
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memset(outSpace, 0, outL);
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strcat(outSpace, filename);
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strcat(outSpace, ".zst");
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return (char*)outSpace;
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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\n", exeName);
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return 1;
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}
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const char* const inFilename = argv[1];
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char* const outFilename = createOutFilename_orDie(inFilename);
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compressFile_orDie(inFilename, outFilename, 1);
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free(outFilename); /* not strictly required, since program execution stops there,
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* but some static analyzer main complain otherwise */
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return 0;
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}
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