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https://github.com/facebook/zstd.git
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115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
/**
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* Copyright 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 the license found in the
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* LICENSE-examples file in the root directory of this source tree.
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*/
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#include <stdlib.h> // malloc, exit
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#include <stdio.h> // fprintf, perror, feof
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#include <string.h> // strerror
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#include <errno.h> // errno
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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 decompressFile_orDie(const char* fname)
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{
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FILE* const fin = fopen_orDie(fname, "rb");
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size_t const buffInSize = ZSTD_DStreamInSize();
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void* const buffIn = malloc_orDie(buffInSize);
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FILE* const fout = stdout;
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size_t const buffOutSize = ZSTD_DStreamOutSize(); /* Guarantee to successfully flush at least one complete compressed block in all circumstances. */
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void* const buffOut = malloc_orDie(buffOutSize);
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ZSTD_DStream* const dstream = ZSTD_createDStream();
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if (dstream==NULL) { fprintf(stderr, "ZSTD_createDStream() error \n"); exit(10); }
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/* In more complex scenarios, a file may consist of multiple appended frames (ex : pzstd).
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* The following example decompresses only the first frame.
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* It is compatible with other provided streaming examples */
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size_t const initResult = ZSTD_initDStream(dstream);
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if (ZSTD_isError(initResult)) { fprintf(stderr, "ZSTD_initDStream() error : %s \n", ZSTD_getErrorName(initResult)); exit(11); }
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size_t read, toRead = initResult;
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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_decompressStream(dstream, &output , &input); /* toRead : size of next compressed block */
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if (ZSTD_isError(toRead)) { fprintf(stderr, "ZSTD_decompressStream() error : %s \n", ZSTD_getErrorName(toRead)); exit(12); }
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fwrite_orDie(buffOut, output.pos, fout);
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}
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}
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ZSTD_freeDStream(dstream);
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fclose_orDie(fin);
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fclose_orDie(fout);
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free(buffIn);
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free(buffOut);
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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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fprintf(stderr, "wrong arguments\n");
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fprintf(stderr, "usage:\n");
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fprintf(stderr, "%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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decompressFile_orDie(inFilename);
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return 0;
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}
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