X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=deps%2Flibchdr%2Fdeps%2Fzstd-1.5.5%2Fexamples%2Fstreaming_compression_thread_pool.c;fp=deps%2Flibchdr%2Fdeps%2Fzstd-1.5.5%2Fexamples%2Fstreaming_compression_thread_pool.c;h=a1a024129f2b53b22f8258983eabeb3418892630;hb=648db22b0750712da893c306efcc8e4b2d3a4e3c;hp=0000000000000000000000000000000000000000;hpb=e2fb1389dc12376acb84e4993ed3b08760257252;p=pcsx_rearmed.git diff --git a/deps/libchdr/deps/zstd-1.5.5/examples/streaming_compression_thread_pool.c b/deps/libchdr/deps/zstd-1.5.5/examples/streaming_compression_thread_pool.c new file mode 100644 index 00000000..a1a02412 --- /dev/null +++ b/deps/libchdr/deps/zstd-1.5.5/examples/streaming_compression_thread_pool.c @@ -0,0 +1,180 @@ +/* + * 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 // printf +#include // free +#include // memset, strcat, strlen +#include // presumes zstd library is installed +#include "common.h" // Helper functions, CHECK(), and CHECK_ZSTD() +#include + +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; +}