* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
-
-
-#include <stdlib.h> // malloc, exit
#include <stdio.h> // printf
-#include <string.h> // strerror
-#include <errno.h> // errno
-#include <sys/stat.h> // stat
+#include <stdlib.h> // free
+#include <string.h> // memset, strcat
#include <zstd.h> // presumes zstd library is installed
-
-
-static off_t fsize_orDie(const char *filename)
-{
- struct stat st;
- if (stat(filename, &st) == 0) return st.st_size;
- /* error */
- perror(filename);
- 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(2);
-}
-
-static void* malloc_orDie(size_t size)
-{
- void* const buff = malloc(size);
- if (buff) return buff;
- /* error */
- perror("malloc");
- exit(3);
-}
-
-static void* loadFile_orDie(const char* fileName, size_t* size)
-{
- 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));
- exit(4);
- }
- fclose(inFile);
- *size = buffSize;
- return buffer;
-}
-
-static void saveFile_orDie(const char* fileName, const void* buff, size_t buffSize)
-{
- 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));
- exit(5);
- }
- if (fclose(oFile)) {
- perror(fileName);
- exit(6);
- }
-}
+#include "common.h" // Helper functions, CHECK(), and CHECK_ZSTD()
/* createDict() :
`dictFileName` is supposed to have been created using `zstd --train` */
{
size_t dictSize;
printf("loading dictionary %s \n", dictFileName);
- void* const dictBuffer = loadFile_orDie(dictFileName, &dictSize);
+ void* const dictBuffer = mallocAndLoadFile_orDie(dictFileName, &dictSize);
ZSTD_CDict* const cdict = ZSTD_createCDict(dictBuffer, dictSize, cLevel);
- if (!cdict) {
- fprintf(stderr, "ZSTD_createCDict error \n");
- exit(7);
- }
+ CHECK(cdict != NULL, "ZSTD_createCDict() failed!");
free(dictBuffer);
return cdict;
}
static void compress(const char* fname, const char* oname, const ZSTD_CDict* cdict)
{
size_t fSize;
- void* const fBuff = loadFile_orDie(fname, &fSize);
+ void* const fBuff = mallocAndLoadFile_orDie(fname, &fSize);
size_t const cBuffSize = ZSTD_compressBound(fSize);
void* const cBuff = malloc_orDie(cBuffSize);
+ /* Compress using the dictionary.
+ * This function writes the dictionary id, and content size into the header.
+ * But, it doesn't use a checksum. You can control these options using the
+ * advanced API: ZSTD_CCtx_setParameter(), ZSTD_CCtx_refCDict(),
+ * and ZSTD_compress2().
+ */
ZSTD_CCtx* const cctx = ZSTD_createCCtx();
- if (cctx==NULL) { fprintf(stderr, "ZSTD_createCCtx() error \n"); exit(10); }
+ CHECK(cctx != NULL, "ZSTD_createCCtx() failed!");
size_t const cSize = ZSTD_compress_usingCDict(cctx, cBuff, cBuffSize, fBuff, fSize, cdict);
- if (ZSTD_isError(cSize)) {
- fprintf(stderr, "error compressing %s : %s \n", fname, ZSTD_getErrorName(cSize));
- exit(7);
- }
+ CHECK_ZSTD(cSize);
saveFile_orDie(oname, cBuff, cSize);