1/*
2 * Copyright (c) Yann Collet, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
8 * You may select, at your option, one of the above-listed licenses.
9 */
10
11#include <stdio.h>     // printf
12#include <stdlib.h>    // free
13#include <string.h>    // memcpy, strlen
14#include <zstd.h>      // presumes zstd library is installed
15#include "common.h"    // Helper functions, CHECK(), and CHECK_ZSTD()
16
17typedef struct {
18    void* fBuffer;
19    void* cBuffer;
20    size_t fBufferSize;
21    size_t cBufferSize;
22    ZSTD_CCtx* cctx;
23} resources;
24
25/*
26 * allocate memory for buffers big enough to compress all files
27 * as well as memory for output file name (ofn)
28 */
29static resources createResources_orDie(int argc, const char** argv, char **ofn, size_t* ofnBufferLen)
30{
31    size_t maxFilenameLength=0;
32    size_t maxFileSize = 0;
33
34    int argNb;
35    for (argNb = 1; argNb < argc; argNb++) {
36      const char* const filename = argv[argNb];
37      size_t const filenameLength = strlen(filename);
38      size_t const fileSize = fsize_orDie(filename);
39
40      if (filenameLength > maxFilenameLength) maxFilenameLength = filenameLength;
41      if (fileSize > maxFileSize) maxFileSize = fileSize;
42    }
43
44    resources ress;
45    ress.fBufferSize = maxFileSize;
46    ress.cBufferSize = ZSTD_compressBound(maxFileSize);
47
48    *ofnBufferLen = maxFilenameLength + 5;
49    *ofn = (char*)malloc_orDie(*ofnBufferLen);
50    ress.fBuffer = malloc_orDie(ress.fBufferSize);
51    ress.cBuffer = malloc_orDie(ress.cBufferSize);
52    ress.cctx = ZSTD_createCCtx();
53    CHECK(ress.cctx != NULL, "ZSTD_createCCtx() failed!");
54    return ress;
55}
56
57static void freeResources(resources ress, char *outFilename)
58{
59    free(ress.fBuffer);
60    free(ress.cBuffer);
61    ZSTD_freeCCtx(ress.cctx);   /* never fails */
62    free(outFilename);
63}
64
65/* compress with pre-allocated context (ZSTD_CCtx) and input/output buffers*/
66static void compressFile_orDie(resources ress, const char* fname, const char* oname)
67{
68    size_t fSize = loadFile_orDie(fname, ress.fBuffer, ress.fBufferSize);
69
70    /* Compress using the context.
71     * If you need more control over parameters, use the advanced API:
72     * ZSTD_CCtx_setParameter(), and ZSTD_compress2().
73     */
74    size_t const cSize = ZSTD_compressCCtx(ress.cctx, ress.cBuffer, ress.cBufferSize, ress.fBuffer, fSize, 1);
75    CHECK_ZSTD(cSize);
76
77    saveFile_orDie(oname, ress.cBuffer, cSize);
78
79    /* success */
80    printf("%25s : %6u -> %7u - %s \n", fname, (unsigned)fSize, (unsigned)cSize, oname);
81}
82
83int main(int argc, const char** argv)
84{
85    const char* const exeName = argv[0];
86
87    if (argc<2) {
88        printf("wrong arguments\n");
89        printf("usage:\n");
90        printf("%s FILE(s)\n", exeName);
91        return 1;
92    }
93
94    /* memory allocation for outFilename and resources */
95    char* outFilename;
96    size_t outFilenameBufferLen;
97    resources const ress = createResources_orDie(argc, argv, &outFilename, &outFilenameBufferLen);
98
99    /* compress files with shared context, input and output buffers */
100    int argNb;
101    for (argNb = 1; argNb < argc; argNb++) {
102        const char* const inFilename = argv[argNb];
103        size_t const inFilenameLen = strlen(inFilename);
104        CHECK(inFilenameLen + 5 <= outFilenameBufferLen, "File name too long!");
105        memcpy(outFilename, inFilename, inFilenameLen);
106        memcpy(outFilename+inFilenameLen, ".zst", 5);
107        compressFile_orDie(ress, inFilename, outFilename);
108    }
109
110    /* free memory */
111    freeResources(ress,outFilename);
112
113    printf("compressed %i files \n", argc-1);
114
115    return 0;
116}
117