143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/*
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Simple compression
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Educational program using zstd library
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Copyright (C) Yann Collet 2016
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GPL v2 License
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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You can contact the author at :
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- zstd homepage : http://www.zstd.net/
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*/
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#include <stdlib.h> // malloc, exit
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#include <stdio.h> // fprintf, perror
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#include <string.h> // strerror
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#include <errno.h> // errno
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#include <sys/stat.h> // stat
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#include <zstd.h> // presumes zstd library is installed
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static off_t fsize_X(const char *filename)
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{
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struct stat st;
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if (stat(filename, &st) == 0) return st.st_size;
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/* error */
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perror(filename);
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exit(1);
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}
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static FILE* fopen_X(const char *filename, const char *instruction)
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{
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FILE* const inFile = fopen(filename, instruction);
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if (inFile) return inFile;
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/* error */
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perror(filename);
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exit(2);
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}
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static void* malloc_X(size_t size)
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{
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void* const buff = malloc(size);
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if (buff) return buff;
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/* error */
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perror(NULL);
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exit(3);
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}
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static void* loadFile_X(const char* fileName, size_t* size)
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{
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off_t const buffSize = fsize_X(fileName);
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FILE* const inFile = fopen_X(fileName, "rb");
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void* const buffer = malloc_X(buffSize);
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size_t const readSize = fread(buffer, 1, buffSize, inFile);
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if (readSize != (size_t)buffSize) {
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fprintf(stderr, "fread: %s : %s \n", fileName, strerror(errno));
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exit(4);
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}
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fclose(inFile);
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*size = buffSize;
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return buffer;
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}
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static void saveFile_X(const char* fileName, const void* buff, size_t buffSize)
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{
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FILE* const oFile = fopen_X(fileName, "wb");
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size_t const wSize = fwrite(buff, 1, buffSize, oFile);
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if (wSize != (size_t)buffSize) {
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fprintf(stderr, "fwrite: %s : %s \n", fileName, strerror(errno));
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exit(5);
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}
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if (fclose(oFile)) {
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perror(fileName);
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exit(6);
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}
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}
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static void compress(const char* fname, const char* oname)
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{
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size_t fSize;
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void* const fBuff = loadFile_X(fname, &fSize);
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size_t const cBuffSize = ZSTD_compressBound(fSize);
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void* const cBuff = malloc_X(cBuffSize);
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size_t const cSize = ZSTD_compress(cBuff, cBuffSize, fBuff, fSize, 1);
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if (ZSTD_isError(cSize)) {
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fprintf(stderr, "error compressing %s : %s \n", fname, ZSTD_getErrorName(cSize));
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exit(7);
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}
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saveFile_X(oname, cBuff, 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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free(fBuff);
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free(cBuff);
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}
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static const char* createOutFilename(const char* filename)
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{
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size_t const inL = strlen(filename);
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size_t const outL = inL + 5;
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void* outSpace = malloc_X(outL);
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memset(outSpace, 0, outL);
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strcat(outSpace, filename);
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strcat(outSpace, ".zst");
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return (const char*)outSpace;
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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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const char* const inFilename = argv[1];
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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\n", exeName);
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return 1;
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}
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const char* const outFilename = createOutFilename(inFilename);
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compress(inFilename, outFilename);
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return 0;
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}
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