117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#include <stdio.h> // printf
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#include <stdlib.h> // free
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#include <string.h> // memcpy, strlen
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#include <zstd.h> // presumes zstd library is installed
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#include "common.h" // Helper functions, CHECK(), and CHECK_ZSTD()
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typedef struct {
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void* fBuffer;
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void* cBuffer;
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size_t fBufferSize;
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size_t cBufferSize;
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ZSTD_CCtx* cctx;
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} resources;
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/*
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* allocate memory for buffers big enough to compress all files
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* as well as memory for output file name (ofn)
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*/
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static resources createResources_orDie(int argc, const char** argv, char **ofn, size_t* ofnBufferLen)
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{
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size_t maxFilenameLength=0;
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size_t maxFileSize = 0;
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int argNb;
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for (argNb = 1; argNb < argc; argNb++) {
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const char* const filename = argv[argNb];
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size_t const filenameLength = strlen(filename);
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size_t const fileSize = fsize_orDie(filename);
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if (filenameLength > maxFilenameLength) maxFilenameLength = filenameLength;
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if (fileSize > maxFileSize) maxFileSize = fileSize;
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}
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resources ress;
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ress.fBufferSize = maxFileSize;
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ress.cBufferSize = ZSTD_compressBound(maxFileSize);
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*ofnBufferLen = maxFilenameLength + 5;
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*ofn = (char*)malloc_orDie(*ofnBufferLen);
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ress.fBuffer = malloc_orDie(ress.fBufferSize);
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ress.cBuffer = malloc_orDie(ress.cBufferSize);
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ress.cctx = ZSTD_createCCtx();
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CHECK(ress.cctx != NULL, "ZSTD_createCCtx() failed!");
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return ress;
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}
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static void freeResources(resources ress, char *outFilename)
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{
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free(ress.fBuffer);
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free(ress.cBuffer);
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ZSTD_freeCCtx(ress.cctx); /* never fails */
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free(outFilename);
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}
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/* compress with pre-allocated context (ZSTD_CCtx) and input/output buffers*/
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static void compressFile_orDie(resources ress, const char* fname, const char* oname)
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{
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size_t fSize = loadFile_orDie(fname, ress.fBuffer, ress.fBufferSize);
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/* Compress using the context.
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* If you need more control over parameters, use the advanced API:
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* ZSTD_CCtx_setParameter(), and ZSTD_compress2().
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*/
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size_t const cSize = ZSTD_compressCCtx(ress.cctx, ress.cBuffer, ress.cBufferSize, ress.fBuffer, fSize, 1);
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CHECK_ZSTD(cSize);
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saveFile_orDie(oname, ress.cBuffer, cSize);
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/* success */
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printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname);
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}
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int main(int argc, const char** argv)
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{
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const char* const exeName = argv[0];
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if (argc<2) {
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printf("wrong arguments\n");
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printf("usage:\n");
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printf("%s FILE(s)\n", exeName);
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return 1;
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}
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/* memory allocation for outFilename and resources */
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char* outFilename;
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size_t outFilenameBufferLen;
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resources const ress = createResources_orDie(argc, argv, &outFilename, &outFilenameBufferLen);
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/* compress files with shared context, input and output buffers */
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int argNb;
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for (argNb = 1; argNb < argc; argNb++) {
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const char* const inFilename = argv[argNb];
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size_t const inFilenameLen = strlen(inFilename);
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CHECK(inFilenameLen + 5 <= outFilenameBufferLen, "File name too long!");
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memcpy(outFilename, inFilename, inFilenameLen);
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memcpy(outFilename+inFilenameLen, ".zst", 5);
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compressFile_orDie(ress, inFilename, outFilename);
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}
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/* free memory */
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freeResources(ress,outFilename);
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printf("compressed %i files \n", argc-1);
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return 0;
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}
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