mirror of
https://github.com/thead-yocto-mirror/skia
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128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
// Copyright 2017 The Wuffs Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ----------------
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/*
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library exercises the software libraries built by `wuffs genlib`.
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To exercise the static library:
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$CC -static -I../../.. library.c ../../gen/lib/c/$CC-static/libwuffs.a
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./a.out
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rm -f a.out
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To exercise the dynamic library:
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$CC -I../../.. library.c -L../../gen/lib/c/$CC-dynamic -lwuffs
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LD_LIBRARY_PATH=../../gen/lib/c/$CC-dynamic ./a.out
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rm -f a.out
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for a C compiler $CC, such as clang or gcc.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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// Wuffs ships as a "single file C library" or "header file library" as per
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// https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
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//
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// By #include'ing it "as is" without #define'ing WUFFS_IMPLEMENTATION, we use
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// it as a "foo.h"-like header, instead of a "foo.c"-like implementation.
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#if defined(WUFFS_IMPLEMENTATION)
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#error "example/library should not #define WUFFS_IMPLEMENTATION"
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#endif
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#include "wuffs/release/c/wuffs-unsupported-snapshot.c"
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#ifndef DST_BUFFER_SIZE
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#define DST_BUFFER_SIZE 1024
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#endif
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uint8_t dst_buffer[DST_BUFFER_SIZE];
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// src_ptr and src_len hold a gzip-encoded "Hello Wuffs."
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//
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// $ echo "Hello Wuffs." | gzip --no-name | xxd
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// 00000000: 1f8b 0800 0000 0000 0003 f348 cdc9 c957 ...........H...W
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// 00000010: 082f 4d4b 2bd6 e302 003c 8475 bb0d 0000 ./MK+....<.u....
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// 00000020: 00 .
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//
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// Passing --no-name to the gzip command line also means to skip the timestamp,
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// which means that its output is deterministic.
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uint8_t src_ptr[] = {
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0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, // 00..07
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0x00, 0x03, 0xf3, 0x48, 0xcd, 0xc9, 0xc9, 0x57, // 08..0F
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0x08, 0x2f, 0x4d, 0x4b, 0x2b, 0xd6, 0xe3, 0x02, // 10..17
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0x00, 0x3c, 0x84, 0x75, 0xbb, 0x0d, 0x00, 0x00, // 18..1F
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0x00, // 20..20
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};
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size_t src_len = 0x21;
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#define WORK_BUFFER_SIZE WUFFS_GZIP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE
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#if WORK_BUFFER_SIZE > 0
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uint8_t work_buffer[WORK_BUFFER_SIZE];
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#else
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// Not all C/C++ compilers support 0-length arrays.
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uint8_t work_buffer[1];
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#endif
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static const char* decode() {
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wuffs_base__io_buffer dst;
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dst.data.ptr = dst_buffer;
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dst.data.len = DST_BUFFER_SIZE;
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dst.meta.wi = 0;
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dst.meta.ri = 0;
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dst.meta.pos = 0;
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dst.meta.closed = false;
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wuffs_base__io_buffer src;
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src.data.ptr = src_ptr;
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src.data.len = src_len;
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src.meta.wi = src_len;
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src.meta.ri = 0;
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src.meta.pos = 0;
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src.meta.closed = true;
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wuffs_gzip__decoder* dec =
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(wuffs_gzip__decoder*)(calloc(sizeof__wuffs_gzip__decoder(), 1));
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if (!dec) {
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return "out of memory";
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}
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const char* status = wuffs_gzip__decoder__initialize(
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dec, sizeof__wuffs_gzip__decoder(), WUFFS_VERSION,
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WUFFS_INITIALIZE__ALREADY_ZEROED);
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if (status) {
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free(dec);
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return status;
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}
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status = wuffs_gzip__decoder__decode_io_writer(
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dec, &dst, &src,
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wuffs_base__make_slice_u8(work_buffer, WORK_BUFFER_SIZE));
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if (status) {
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free(dec);
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return status;
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}
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fwrite(dst.data.ptr, sizeof(uint8_t), dst.meta.wi, stdout);
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free(dec);
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return NULL;
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}
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int main(int argc, char** argv) {
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const char* status = decode();
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if (status) {
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fprintf(stderr, "%s\n", status);
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return 1;
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}
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return 0;
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}
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