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Code Issues Releases 1 Activity

Factor out allocMemory_orDIe(...) in simple_compressionCCtx.c, and amend Makefile to account for dependency on utils.h

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This commit is contained in:
Yi Jin 2018-12-16 15:36:28 -08:00
parent 0d14153cfb
commit cce0842c60
3 changed files with 59 additions and 41 deletions
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34
examples/Makefile
View File

@ -25,32 +25,32 @@ all: simple_compression simple_decompression \
$(LIB) :
$(MAKE) -C ../lib libzstd.a
simple_compression : simple_compression.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
simple_compression : simple_compression.c utils.h $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
simple_decompression : simple_decompression.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
simple_decompression : simple_decompression.c utils.h $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
simple_compressionCCtx : simple_compressionCCtx.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
simple_compressionCCtx : simple_compressionCCtx.c utils.h $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
dictionary_compression : dictionary_compression.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
dictionary_compression : dictionary_compression.c utils.h $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
dictionary_decompression : dictionary_decompression.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
dictionary_decompression : dictionary_decompression.c utils.h $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
streaming_compression : streaming_compression.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
streaming_compression : streaming_compression.c utils.h $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
multiple_streaming_compression : multiple_streaming_compression.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
multiple_streaming_compression : multiple_streaming_compression.c utils.h $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
streaming_decompression : streaming_decompression.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
streaming_decompression : streaming_decompression.c utils.h $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
streaming_memory_usage : streaming_memory_usage.c $(LIB)
$(CC) $(CPPFLAGS) $(CFLAGS) $^ $(LDFLAGS) -o $@
$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
clean:
@rm -f core *.o tmp* result* *.zst \

62
examples/simple_compressionCCtx.c
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@ -23,7 +23,7 @@ static void compressExpress_orDie(const char* fname, const char* oname,
size_t fSize;
loadFile_orDie(fname, &fSize, fBuff, fBuffSize);
size_t const cSize = ZSTD_compressCCtx(cctx, cBuff, cBuffSize, fBuff, fBuffSize, 1);
size_t const cSize = ZSTD_compressCCtx(cctx, cBuff, cBuffSize, fBuff, fSize, 1);
if (ZSTD_isError(cSize)) {
fprintf(stderr, "error compressing %s : %s \n", fname, ZSTD_getErrorName(cSize));
exit(8);
@ -42,6 +42,32 @@ static void getOutFilename(const char* const filename, char* const outFilename)
strcat(outFilename, ".zst");
}
/* allocate memory for buffers big enough to compress all files
* as well as memory for output file names (outFileName)
*/
void allocMemory_orDie(int argc, const char** argv, char** outFilename,
void** cBuffer, size_t* cBufferSize, void** fBuffer, size_t* fBufferSize) {
size_t maxFilenameLength=0;
size_t maxFileSize = 0;
int argNb;
for (argNb = 1; argNb < argc; argNb++) {
const char* const filename = argv[argNb];
size_t const filenameLength = strlen(filename);
size_t const fileSize = fsize_orDie(filename);
if (filenameLength > maxFilenameLength) maxFilenameLength = filenameLength;
if (fileSize > maxFileSize) maxFileSize = fileSize;
}
*cBufferSize = ZSTD_compressBound(maxFileSize);
*fBufferSize = maxFileSize;
/* allocate memory for output file name, input/output buffers for all compression tasks */
*outFilename = (char*)malloc_orDie(maxFilenameLength + 5);
*cBuffer = malloc_orDie(*cBufferSize);
*fBuffer = malloc_orDie(*fBufferSize);
}
int main(int argc, const char** argv)
{
const char* const exeName = argv[0];
@ -53,36 +79,28 @@ int main(int argc, const char** argv)
return 1;
}
/* pre-calculate buffer sizes needed to handle all files */
size_t maxFileNameLength=0;
size_t maxFileSize = 0;
size_t maxCBufferSize = 0;
int argNb;
for (argNb = 1; argNb < argc; argNb++) {
const char* const fileName = argv[argNb];
size_t const fileNameLength = strlen(fileName);
size_t const fileSize = fsize_orDie(fileName);
if (fileNameLength > maxFileNameLength) maxFileNameLength = fileNameLength;
if (fileSize > maxFileSize) maxFileSize = fileSize;
}
maxCBufferSize = ZSTD_compressBound(maxFileSize);
/* allocate memory for output file name, input/output buffers for all compression tasks */
char* const outFilename = (char*)malloc_orDie(maxFileNameLength + 5);
void* const fBuffer = malloc_orDie(maxFileSize);
void* const cBuffer = malloc_orDie(maxCBufferSize);
/* allocate memory for buffers big enough to compress all files
* as well as memory for output file name (outFileName)
* fBuffer - buffer for input file data
* cBuffer - buffer for compressed data
*/
char* outFilename;
void* fBuffer;
void* cBuffer;
size_t fBufferSize;
size_t cBufferSize;
allocMemory_orDie(argc, argv, &outFilename, &cBuffer, &cBufferSize, &fBuffer, &fBufferSize);
/* create a compression context (ZSTD_CCtx) for all compression tasks */
ZSTD_CCtx* const cctx = ZSTD_createCCtx();
if (cctx==NULL) { fprintf(stderr, "ZSTD_createCCtx() error \n"); exit(10); }
/* compress files with shared context, input and output buffers */
int argNb;
for (argNb = 1; argNb < argc; argNb++) {
const char* const inFilename = argv[argNb];
getOutFilename(inFilename, outFilename);
compressExpress_orDie(inFilename, outFilename, cctx, cBuffer, maxCBufferSize, fBuffer, maxFileSize);
compressExpress_orDie(inFilename, outFilename, cctx, cBuffer, cBufferSize, fBuffer, fBufferSize);
}
/* free momery resources */

4
examples/utils.h
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@ -51,8 +51,8 @@ static size_t fsize_orDie(const char *filename)
off_t const fileSize = st.st_size;
size_t const size = (size_t)fileSize;
/* if off_t -> size_t conversion causes discrepancy, the file size is
* too big for at least 1 type to handle
/* if off_t -> size_t type conversion results in discrepancy,
* the file size is too big for at least one type to handle.
*/
if (size != fileSize) { /* narrowcast overflow */
fprintf(stderr, "%s : filesize too large \n", filename);