115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
/**
|
|
* Copyright 2016-present, Yann Collet, Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the license found in the
|
|
* LICENSE-examples file in the root directory of this source tree.
|
|
*/
|
|
|
|
|
|
#include <stdlib.h> // malloc, exit
|
|
#include <stdio.h> // fprintf, perror, feof
|
|
#include <string.h> // strerror
|
|
#include <errno.h> // errno
|
|
#include <zstd.h> // presumes zstd library is installed
|
|
|
|
|
|
static void* malloc_orDie(size_t size)
|
|
{
|
|
void* const buff = malloc(size);
|
|
if (buff) return buff;
|
|
/* error */
|
|
perror("malloc:");
|
|
exit(1);
|
|
}
|
|
|
|
static FILE* fopen_orDie(const char *filename, const char *instruction)
|
|
{
|
|
FILE* const inFile = fopen(filename, instruction);
|
|
if (inFile) return inFile;
|
|
/* error */
|
|
perror(filename);
|
|
exit(3);
|
|
}
|
|
|
|
static size_t fread_orDie(void* buffer, size_t sizeToRead, FILE* file)
|
|
{
|
|
size_t const readSize = fread(buffer, 1, sizeToRead, file);
|
|
if (readSize == sizeToRead) return readSize; /* good */
|
|
if (feof(file)) return readSize; /* good, reached end of file */
|
|
/* error */
|
|
perror("fread");
|
|
exit(4);
|
|
}
|
|
|
|
static size_t fwrite_orDie(const void* buffer, size_t sizeToWrite, FILE* file)
|
|
{
|
|
size_t const writtenSize = fwrite(buffer, 1, sizeToWrite, file);
|
|
if (writtenSize == sizeToWrite) return sizeToWrite; /* good */
|
|
/* error */
|
|
perror("fwrite");
|
|
exit(5);
|
|
}
|
|
|
|
static size_t fclose_orDie(FILE* file)
|
|
{
|
|
if (!fclose(file)) return 0;
|
|
/* error */
|
|
perror("fclose");
|
|
exit(6);
|
|
}
|
|
|
|
|
|
static void decompressFile_orDie(const char* fname)
|
|
{
|
|
FILE* const fin = fopen_orDie(fname, "rb");
|
|
size_t const buffInSize = ZSTD_DStreamInSize();
|
|
void* const buffIn = malloc_orDie(buffInSize);
|
|
FILE* const fout = stdout;
|
|
size_t const buffOutSize = ZSTD_DStreamOutSize(); /* Guarantee to successfully flush at least one complete compressed block in all circumstances. */
|
|
void* const buffOut = malloc_orDie(buffOutSize);
|
|
|
|
ZSTD_DStream* const dstream = ZSTD_createDStream();
|
|
if (dstream==NULL) { fprintf(stderr, "ZSTD_createDStream() error \n"); exit(10); }
|
|
|
|
/* In more complex scenarios, a file may consist of multiple appended frames (ex : pzstd).
|
|
* The following example decompresses only the first frame.
|
|
* It is compatible with other provided streaming examples */
|
|
size_t const initResult = ZSTD_initDStream(dstream);
|
|
if (ZSTD_isError(initResult)) { fprintf(stderr, "ZSTD_initDStream() error : %s \n", ZSTD_getErrorName(initResult)); exit(11); }
|
|
size_t read, toRead = initResult;
|
|
while ( (read = fread_orDie(buffIn, toRead, fin)) ) {
|
|
ZSTD_inBuffer input = { buffIn, read, 0 };
|
|
while (input.pos < input.size) {
|
|
ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
|
|
toRead = ZSTD_decompressStream(dstream, &output , &input); /* toRead : size of next compressed block */
|
|
if (ZSTD_isError(toRead)) { fprintf(stderr, "ZSTD_decompressStream() error : %s \n", ZSTD_getErrorName(toRead)); exit(12); }
|
|
fwrite_orDie(buffOut, output.pos, fout);
|
|
}
|
|
}
|
|
|
|
ZSTD_freeDStream(dstream);
|
|
fclose_orDie(fin);
|
|
fclose_orDie(fout);
|
|
free(buffIn);
|
|
free(buffOut);
|
|
}
|
|
|
|
|
|
int main(int argc, const char** argv)
|
|
{
|
|
const char* const exeName = argv[0];
|
|
|
|
if (argc!=2) {
|
|
fprintf(stderr, "wrong arguments\n");
|
|
fprintf(stderr, "usage:\n");
|
|
fprintf(stderr, "%s FILE\n", exeName);
|
|
return 1;
|
|
}
|
|
|
|
const char* const inFilename = argv[1];
|
|
|
|
decompressFile_orDie(inFilename);
|
|
return 0;
|
|
}
|