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Code Issues Releases 1 Activity

updated examples (#273)

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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
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47
examples/dictionary_compression.c
View File

@ -31,7 +31,7 @@
#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;
@ -40,7 +40,7 @@ static off_t fsize_X(const char *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;
@ -49,20 +49,20 @@ static FILE* fopen_X(const char *filename, const char *instruction)
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 */
perror(NULL);
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) {
fprintf(stderr, "fread: %s : %s \n", fileName, strerror(errno));
@ -73,9 +73,9 @@ static void* loadFile_X(const char* fileName, size_t* size)
return buffer;
}
static void saveFile_X(const char* fileName, const void* buff, size_t buffSize)
static void saveFile_orDie(const char* fileName, const void* buff, size_t buffSize)
{
FILE* const oFile = fopen_X(fileName, "wb");
FILE* const oFile = fopen_orDie(fileName, "wb");
size_t const wSize = fwrite(buff, 1, buffSize, oFile);
if (wSize != (size_t)buffSize) {
fprintf(stderr, "fwrite: %s : %s \n", fileName, strerror(errno));
@ -89,23 +89,27 @@ static void saveFile_X(const char* fileName, const void* buff, size_t buffSize)
/* createDict() :
`dictFileName` is supposed to have been created using `zstd --train` */
static const ZSTD_CDict* createDict(const char* dictFileName)
static ZSTD_CDict* createCDict_orDie(const char* dictFileName)
{
size_t dictSize;
printf("loading dictionary %s \n", dictFileName);
void* const dictBuffer = loadFile_X(dictFileName, &dictSize);
const ZSTD_CDict* const ddict = ZSTD_createCDict(dictBuffer, dictSize, 3);
void* const dictBuffer = loadFile_orDie(dictFileName, &dictSize);
ZSTD_CDict* const cdict = ZSTD_createCDict(dictBuffer, dictSize, 3);
if (!cdict) {
fprintf(stderr, "ZSTD_createCDict error \n");
exit(7);
}
free(dictBuffer);
return ddict;
return cdict;
}
static void compress(const char* fname, const char* oname, const ZSTD_CDict* cdict)
{
size_t fSize;
void* const fBuff = loadFile_X(fname, &fSize);
void* const fBuff = loadFile_orDie(fname, &fSize);
size_t const cBuffSize = ZSTD_compressBound(fSize);
void* const cBuff = malloc_X(cBuffSize);
void* const cBuff = malloc_orDie(cBuffSize);
ZSTD_CCtx* const cctx = ZSTD_createCCtx();
size_t const cSize = ZSTD_compress_usingCDict(cctx, cBuff, cBuffSize, fBuff, fSize, cdict);
@ -114,7 +118,7 @@ static void compress(const char* fname, const char* oname, const ZSTD_CDict* cdi
exit(7);
}
saveFile_X(oname, cBuff, cSize);
saveFile_orDie(oname, cBuff, cSize);
/* success */
printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname);
@ -125,11 +129,11 @@ static void compress(const char* fname, const char* oname, const ZSTD_CDict* cdi
}
static char* createOutFilename(const char* filename)
static char* createOutFilename_orDie(const char* filename)
{
size_t const inL = strlen(filename);
size_t const outL = inL + 5;
void* outSpace = malloc_X(outL);
void* outSpace = malloc_orDie(outL);
memset(outSpace, 0, outL);
strcat(outSpace, filename);
strcat(outSpace, ".zst");
@ -149,15 +153,16 @@ int main(int argc, const char** argv)
/* load dictionary only once */
const char* const dictName = argv[argc-1];
const ZSTD_CDict* const dictPtr = createDict(dictName);
ZSTD_CDict* const dictPtr = createCDict_orDie(dictName);
int u;
for (u=1; u<argc-1; u++) {
const char* inFilename = argv[u];
char* const outFilename = createOutFilename(inFilename);
char* const outFilename = createOutFilename_orDie(inFilename);
compress(inFilename, outFilename, dictPtr);
free(outFilename);
}
free(dictPtr);
printf("All %u files compressed. \n", argc-2);
}

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);
}