| 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 | } |