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/*
* Copyright (c) Martin Liska, SUSE, Meta Platforms, Inc. and affiliates.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* 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 <stdio.h> // printf
#include <stdlib.h> // free
#include <string.h> // memset, strcat, strlen
#include <zstd.h> // presumes zstd library is installed
#include "common.h" // Helper functions, CHECK(), and CHECK_ZSTD()
#include <pthread.h>
typedef struct compress_args
{
const char *fname;
char *outName;
int cLevel;
#if defined(ZSTD_STATIC_LINKING_ONLY)
ZSTD_threadPool *pool;
#endif
} compress_args_t;
static void *compressFile_orDie(void *data)
{
const int nbThreads = 16;
compress_args_t *args = (compress_args_t *)data;
fprintf (stderr, "Starting compression of %s with level %d, using %d threads\n", args->fname, args->cLevel, nbThreads);
/* Open the input and output files. */
FILE* const fin = fopen_orDie(args->fname, "rb");
FILE* const fout = fopen_orDie(args->outName, "wb");
/* Create the input and output buffers.
* They may be any size, but we recommend using these functions to size them.
* Performance will only suffer significantly for very tiny buffers.
*/
size_t const buffInSize = ZSTD_CStreamInSize();
void* const buffIn = malloc_orDie(buffInSize);
size_t const buffOutSize = ZSTD_CStreamOutSize();
void* const buffOut = malloc_orDie(buffOutSize);
/* Create the context. */
ZSTD_CCtx* const cctx = ZSTD_createCCtx();
CHECK(cctx != NULL, "ZSTD_createCCtx() failed!");
#if defined(ZSTD_STATIC_LINKING_ONLY)
size_t r = ZSTD_CCtx_refThreadPool(cctx, args->pool);
CHECK(r == 0, "ZSTD_CCtx_refThreadPool failed!");
#endif
/* Set any parameters you want.
* Here we set the compression level, and enable the checksum.
*/
CHECK_ZSTD( ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, args->cLevel) );
CHECK_ZSTD( ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1) );
ZSTD_CCtx_setParameter(cctx, ZSTD_c_nbWorkers, nbThreads);
/* This loop reads from the input file, compresses that entire chunk,
* and writes all output produced to the output file.
*/
size_t const toRead = buffInSize;
for (;;) {
size_t read = fread_orDie(buffIn, toRead, fin);
/* Select the flush mode.
* If the read may not be finished (read == toRead) we use
* ZSTD_e_continue. If this is the last chunk, we use ZSTD_e_end.
* Zstd optimizes the case where the first flush mode is ZSTD_e_end,
* since it knows it is compressing the entire source in one pass.
*/
int const lastChunk = (read < toRead);
ZSTD_EndDirective const mode = lastChunk ? ZSTD_e_end : ZSTD_e_continue;
/* Set the input buffer to what we just read.
* We compress until the input buffer is empty, each time flushing the
* output.
*/
ZSTD_inBuffer input = { buffIn, read, 0 };
int finished;
do {
/* Compress into the output buffer and write all of the output to
* the file so we can reuse the buffer next iteration.
*/
ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
size_t const remaining = ZSTD_compressStream2(cctx, &output , &input, mode);
CHECK_ZSTD(remaining);
fwrite_orDie(buffOut, output.pos, fout);
/* If we're on the last chunk we're finished when zstd returns 0,
* which means its consumed all the input AND finished the frame.
* Otherwise, we're finished when we've consumed all the input.
*/
finished = lastChunk ? (remaining == 0) : (input.pos == input.size);
} while (!finished);
CHECK(input.pos == input.size,
"Impossible: zstd only returns 0 when the input is completely consumed!");
if (lastChunk) {
break;
}
}
fprintf (stderr, "Finishing compression of %s\n", args->outName);
ZSTD_freeCCtx(cctx);
fclose_orDie(fout);
fclose_orDie(fin);
free(buffIn);
free(buffOut);
free(args->outName);
return NULL;
}
static char* createOutFilename_orDie(const char* filename)
{
size_t const inL = strlen(filename);
size_t const outL = inL + 5;
void* const outSpace = malloc_orDie(outL);
memset(outSpace, 0, outL);
strcat(outSpace, filename);
strcat(outSpace, ".zst");
return (char*)outSpace;
}
int main(int argc, const char** argv)
{
const char* const exeName = argv[0];
if (argc<=3) {
printf("wrong arguments\n");
printf("usage:\n");
printf("%s POOL_SIZE LEVEL FILES\n", exeName);
return 1;
}
int pool_size = atoi (argv[1]);
CHECK(pool_size != 0, "can't parse POOL_SIZE!");
int level = atoi (argv[2]);
CHECK(level != 0, "can't parse LEVEL!");
argc -= 3;
argv += 3;
#if defined(ZSTD_STATIC_LINKING_ONLY)
ZSTD_threadPool *pool = ZSTD_createThreadPool (pool_size);
CHECK(pool != NULL, "ZSTD_createThreadPool() failed!");
fprintf (stderr, "Using shared thread pool of size %d\n", pool_size);
#else
fprintf (stderr, "All threads use its own thread pool\n");
#endif
pthread_t *threads = malloc_orDie(argc * sizeof(pthread_t));
compress_args_t *args = malloc_orDie(argc * sizeof(compress_args_t));
for (unsigned i = 0; i < argc; i++)
{
args[i].fname = argv[i];
args[i].outName = createOutFilename_orDie(args[i].fname);
args[i].cLevel = level;
#if defined(ZSTD_STATIC_LINKING_ONLY)
args[i].pool = pool;
#endif
pthread_create (&threads[i], NULL, compressFile_orDie, &args[i]);
}
for (unsigned i = 0; i < argc; i++)
pthread_join (threads[i], NULL);
#if defined(ZSTD_STATIC_LINKING_ONLY)
ZSTD_freeThreadPool (pool);
#endif
return 0;
}
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