1 /**
2 * \file simple.c
3 * Simple standalone example of using the single-file \c zstddeclib.
4 *
5 * \note In this simple example we include the amalgamated source and compile
6 * just this single file, but we could equally (and more conventionally)
7 * include \c zstd.h and compile both this file and \c zstddeclib.c (the
8 * resulting binaries differ slightly in size but perform the same).
9 *
10 * \author Carl Woffenden, Numfum GmbH (released under a CC0 license)
11 */
12
13 #include <stddef.h>
14 #include <stdint.h>
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <string.h>
18
19 #include "../zstddeclib.c"
20
21 //************************* Test Data (DXT texture) **************************/
22
23 /**
24 * Raw 256x256 DXT1 data (used to compare the result).
25 * \n
26 * See \c testcard.png for the original.
27 */
28 static uint8_t const rawDxt1[] = {
29 #include "testcard-dxt1.inl"
30 };
31
32 /**
33 * Zstd compressed version of \c #rawDxt1.
34 * \n
35 * See \c testcard.png for the original.
36 */
37 static uint8_t const srcZstd[] = {
38 #include "testcard-zstd.inl"
39 };
40
41 /**
42 * Destination for decoding \c #srcZstd.
43 */
44 static uint8_t dstDxt1[sizeof rawDxt1] = {};
45
46 #ifndef ZSTD_VERSION_MAJOR
47 /**
48 * For the case where the decompression library hasn't been included we add a
49 * dummy function to fake the process and stop the buffers being optimised out.
50 */
ZSTD_decompress(void * dst,size_t dstLen,const void * src,size_t srcLen)51 size_t ZSTD_decompress(void* dst, size_t dstLen, const void* src, size_t srcLen) {
52 return (memcmp(dst, src, (srcLen < dstLen) ? srcLen : dstLen)) ? 0 : dstLen;
53 }
54 #endif
55
56 //****************************************************************************/
57
58 /**
59 * Simple single-file test to decompress \c #srcZstd into \c # dstDxt1 then
60 * compare the resulting bytes with \c #rawDxt1.
61 * \n
62 * As a (naive) comparison, removing Zstd and building with "-Os -g0 simple.c"
63 * results in a 44kB binary (macOS 10.14, Clang 10); re-adding Zstd increases
64 * the binary by 56kB (after calling \c strip).
65 */
main()66 int main() {
67 size_t size = ZSTD_decompress(dstDxt1, sizeof dstDxt1, srcZstd, sizeof srcZstd);
68 int compare = memcmp(rawDxt1, dstDxt1, sizeof dstDxt1);
69 printf("Decompressed size: %s\n", (size == sizeof dstDxt1) ? "PASSED" : "FAILED");
70 printf("Byte comparison: %s\n", (compare == 0) ? "PASSED" : "FAILED");
71 if (size == sizeof dstDxt1 && compare == 0) {
72 return EXIT_SUCCESS;
73 }
74 return EXIT_FAILURE;
75 }
76