lib/zstd
1
0
Fork 0
mirror of https://github.com/facebook/zstd.git synced 2025-07-29 11:21:22 +03:00
Code Activity

updated examples (#273)

Browse Source
This commit is contained in:
Yann Collet
2016-08-01 17:36:11 +02:00
parent 9a69ec4f3b
commit 373d4f9070
2 changed files with 48 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
examples/dictionary_decompression.c
View File

@ -31,41 +31,41 @@
#include <zstd.h> // presumes zstd library is installed
static off_t fsize_X(const char *filename)
static off_t fsize_orDie(const char *filename)
{
struct stat st;
if (stat(filename, &st) == 0) return st.st_size;
/* error */
printf("stat: %s : %s \n", filename, strerror(errno));
perror(filename);
exit(1);
}
static FILE* fopen_X(const char *filename, const char *instruction)
static FILE* fopen_orDie(const char *filename, const char *instruction)
{
FILE* const inFile = fopen(filename, instruction);
if (inFile) return inFile;
/* error */
printf("fopen: %s : %s \n", filename, strerror(errno));
perror(filename);
exit(2);
}
static void* malloc_X(size_t size)
static void* malloc_orDie(size_t size)
{
void* const buff = malloc(size);
if (buff) return buff;
/* error */
printf("malloc: %s \n", strerror(errno));
perror("malloc");
exit(3);
}
static void* loadFile_X(const char* fileName, size_t* size)
static void* loadFile_orDie(const char* fileName, size_t* size)
{
off_t const buffSize = fsize_X(fileName);
FILE* const inFile = fopen_X(fileName, "rb");
void* const buffer = malloc_X(buffSize);
off_t const buffSize = fsize_orDie(fileName);
FILE* const inFile = fopen_orDie(fileName, "rb");
void* const buffer = malloc_orDie(buffSize);
size_t const readSize = fread(buffer, 1, buffSize, inFile);
if (readSize != (size_t)buffSize) {
printf("fread: %s : %s \n", fileName, strerror(errno));
fprintf(stderr, "fread: %s : %s \n", fileName, strerror(errno));
exit(4);
}
fclose(inFile);
@ -75,12 +75,13 @@ static void* loadFile_X(const char* fileName, size_t* size)
/* createDict() :
`dictFileName` is supposed to have been created using `zstd --train` */
static const ZSTD_DDict* createDict(const char* dictFileName)
static ZSTD_DDict* createDict_orDie(const char* dictFileName)
{
size_t dictSize;
printf("loading dictionary %s \n", dictFileName);
void* const dictBuffer = loadFile_X(dictFileName, &dictSize);
const ZSTD_DDict* const ddict = ZSTD_createDDict(dictBuffer, dictSize);
void* const dictBuffer = loadFile_orDie(dictFileName, &dictSize);
ZSTD_DDict* const ddict = ZSTD_createDDict(dictBuffer, dictSize);
if (ddict==NULL) { fprintf(stderr, "ZSTD_createDDict error \n"); exit(5); }
free(dictBuffer);
return ddict;
}
@ -89,19 +90,19 @@ static const ZSTD_DDict* createDict(const char* dictFileName)
static void decompress(const char* fname, const ZSTD_DDict* ddict)
{
size_t cSize;
void* const cBuff = loadFile_X(fname, &cSize);
void* const cBuff = loadFile_orDie(fname, &cSize);
unsigned long long const rSize = ZSTD_getDecompressedSize(cBuff, cSize);
if (rSize==0) {
printf("%s : original size unknown \n", fname);
exit(5);
fprintf(stderr, "%s : original size unknown \n", fname);
exit(6);
}
void* const rBuff = malloc_X(rSize);
void* const rBuff = malloc_orDie(rSize);
ZSTD_DCtx* const dctx = ZSTD_createDCtx();
size_t const dSize = ZSTD_decompress_usingDDict(dctx, rBuff, rSize, cBuff, cSize, ddict);
if (dSize != rSize) {
printf("error decoding %s : %s \n", fname, ZSTD_getErrorName(dSize));
fprintf(stderr, "error decoding %s : %s \n", fname, ZSTD_getErrorName(dSize));
exit(7);
}
@ -127,10 +128,11 @@ int main(int argc, const char** argv)
/* load dictionary only once */
const char* const dictName = argv[argc-1];
const ZSTD_DDict* const dictPtr = createDict(dictName);
ZSTD_DDict* const dictPtr = createDict_orDie(dictName);
int u;
for (u=1; u<argc-1; u++) decompress(argv[u], dictPtr);
ZSTD_freeDDict(dictPtr);
printf("All %u files correctly decoded (in memory) \n", argc-2);
}