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[examples] Clean up and comment the examples

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This commit is contained in:
Nick Terrell
2019-04-05 18:11:17 -07:00
parent 1dfe37fea9
commit 1d0c1707d1
11 changed files with 143 additions and 141 deletions
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25
examples/multiple_simple_compression.c
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@ -8,13 +8,11 @@
* You may select, at your option, one of the above-listed licenses.
*/
#include <stdlib.h> // malloc, free, exit
#include <stdio.h> // fprintf, perror, fopen, etc.
#include <string.h> // strlen, strcat, memset, strerror
#include <errno.h> // errno
#include <sys/stat.h> // stat
#include <stdio.h> // printf
#include <stdlib.h> // free
#include <string.h> // memcpy, strlen
#include <zstd.h> // presumes zstd library is installed
#include "utils.h"
#include "common.h" // Helper functions, CHECK(), and CHECK_ZSTD()
typedef struct {
void* fBuffer;
@ -52,7 +50,7 @@ static resources createResources_orDie(int argc, const char** argv, char **ofn,
ress.fBuffer = malloc_orDie(ress.fBufferSize);
ress.cBuffer = malloc_orDie(ress.cBufferSize);
ress.cctx = ZSTD_createCCtx();
if (ress.cctx==NULL) { fprintf(stderr, "ZSTD_createCCtx() error \n"); exit(10); }
CHECK(ress.cctx != NULL, "ZSTD_createCCtx() failed!");
return ress;
}
@ -69,16 +67,17 @@ static void compressFile_orDie(resources ress, const char* fname, const char* on
{
size_t fSize = loadFile_orDie(fname, ress.fBuffer, ress.fBufferSize);
/* Compress using the context.
* If you need more control over parameters, use the advanced API:
* ZSTD_CCtx_setParameter(), and ZSTD_compress2().
*/
size_t const cSize = ZSTD_compressCCtx(ress.cctx, ress.cBuffer, ress.cBufferSize, ress.fBuffer, fSize, 1);
if (ZSTD_isError(cSize)) {
fprintf(stderr, "error compressing %s : %s \n", fname, ZSTD_getErrorName(cSize));
exit(8);
}
CHECK_ZSTD(cSize);
saveFile_orDie(oname, ress.cBuffer, cSize);
/* success */
// printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname);
printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname);
}
int main(int argc, const char** argv)
@ -102,7 +101,7 @@ int main(int argc, const char** argv)
for (argNb = 1; argNb < argc; argNb++) {
const char* const inFilename = argv[argNb];
size_t const inFilenameLen = strlen(inFilename);
assert(inFilenameLen + 5 <= outFilenameBufferLen);
CHECK(inFilenameLen + 5 <= outFilenameBufferLen, "File name too long!");
memcpy(outFilename, inFilename, inFilenameLen);
memcpy(outFilename+inFilenameLen, ".zst", 5);
compressFile_orDie(ress, inFilename, outFilename);