134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/**
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* Copyright 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the license found in the
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* LICENSE-examples file in the root directory of this source tree.
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*/
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#include <stdlib.h> // malloc, free, exit
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#include <stdio.h> // fprintf, perror, fopen, etc.
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#include <string.h> // strlen, strcat, memset, 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_orDie(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_orDie(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_orDie(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_orDie(const char* fileName, size_t* size)
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{
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off_t const fileSize = fsize_orDie(fileName);
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size_t const buffSize = (size_t)fileSize;
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if ((off_t)buffSize < fileSize) { /* narrowcast overflow */
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fprintf(stderr, "%s : filesize too large \n", fileName);
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exit(4);
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}
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FILE* const inFile = fopen_orDie(fileName, "rb");
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void* const buffer = malloc_orDie(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(5);
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}
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fclose(inFile); /* can't fail, read only */
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*size = buffSize;
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return buffer;
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}
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static void saveFile_orDie(const char* fileName, const void* buff, size_t buffSize)
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{
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FILE* const oFile = fopen_orDie(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(6);
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}
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if (fclose(oFile)) {
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perror(fileName);
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exit(7);
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}
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}
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static void compress_orDie(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_orDie(fname, &fSize);
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size_t const cBuffSize = ZSTD_compressBound(fSize);
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void* const cBuff = malloc_orDie(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(8);
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}
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saveFile_orDie(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 char* createOutFilename_orDie(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* const outSpace = malloc_orDie(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 (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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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 inFilename = argv[1];
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char* const outFilename = createOutFilename_orDie(inFilename);
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compress_orDie(inFilename, outFilename);
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free(outFilename);
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return 0;
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}
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