648db22b |
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 | */ |
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 | */ |
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 | } |