kc3-lang/brotli/research/brotli_decoder.c

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  Commit

• Hash : a8f5813b
  Author :
  Date : 2022-11-17T13:03:09
  

  Update
  
  Documentation:
    - add note that brotli is a "stream" format, not an archive-like
    - regenerate .1 with Pandoc
  Build:
    - drop legacy "BROTLI_BUILD_PORTABLE" option
    - drop "BROTLI_SANITIZED" definition
  Code:
    - c: comb includes
    - c/enc: extract encoder state into separate header
    - c/enc: drop designated q10 codepath
    - c/enc: dealing better with flushing of empty stream
    - fix MSVC compilation
  API:
    - py: use library version instead of one in version.h
    - c: add plugable API to report consumed input / produced output
    - c/java: support "lean" prepared dictionaries (without copy of source)
  

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• research/brotli_decoder.c

• /* Copyright 2018 Google Inc. All Rights Reserved.
  
     Distributed under MIT license.
     See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
  */
  
  #include <stdio.h>
  #include <stdlib.h>
  
  #include <brotli/decode.h>
  
  #if !defined(_WIN32)
  #include <unistd.h>
  #else
  #include <io.h>
  #define fdopen _fdopen
  #if !defined(__MINGW32__)
  #define STDIN_FILENO _fileno(stdin)
  #define STDOUT_FILENO _fileno(stdout)
  #endif
  #endif
  
  #define BUFFER_SIZE (1u << 20)
  
  typedef struct Context {
    FILE* fin;
    FILE* fout;
    uint8_t* input_buffer;
    uint8_t* output_buffer;
    BrotliDecoderState* decoder;
  } Context;
  
  void init(Context* ctx) {
    ctx->fin = 0;
    ctx->fout = 0;
    ctx->input_buffer = 0;
    ctx->output_buffer = 0;
    ctx->decoder = 0;
  }
  
  void cleanup(Context* ctx) {
    if (ctx->decoder) BrotliDecoderDestroyInstance(ctx->decoder);
    if (ctx->output_buffer) free(ctx->output_buffer);
    if (ctx->input_buffer) free(ctx->input_buffer);
    if (ctx->fout) fclose(ctx->fout);
    if (ctx->fin) fclose(ctx->fin);
  }
  
  void fail(Context* ctx, const char* message) {
    fprintf(stderr, "%s\n", message);
    cleanup(ctx);
    exit(1);
  }
  
  int main(int argc, char** argv) {
    Context ctx;
    BrotliDecoderResult result = BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT;
    size_t available_in;
    const uint8_t* next_in;
    size_t available_out = BUFFER_SIZE;
    uint8_t* next_out;
    init(&ctx);
  
    ctx.fin = fdopen(STDIN_FILENO, "rb");
    if (!ctx.fin) fail(&ctx, "can't open input file");
    ctx.fout = fdopen(STDOUT_FILENO, "wb");
    if (!ctx.fout) fail(&ctx, "can't open output file");
    ctx.input_buffer = (uint8_t*)malloc(BUFFER_SIZE);
    if (!ctx.input_buffer) fail(&ctx, "out of memory / input buffer");
    ctx.output_buffer = (uint8_t*)malloc(BUFFER_SIZE);
    if (!ctx.output_buffer) fail(&ctx, "out of memory / output buffer");
    ctx.decoder = BrotliDecoderCreateInstance(0, 0, 0);
    if (!ctx.decoder) fail(&ctx, "out of memory / decoder");
    BrotliDecoderSetParameter(ctx.decoder, BROTLI_DECODER_PARAM_LARGE_WINDOW, 1);
  
    next_out = ctx.output_buffer;
    while (1) {
      if (result == BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT) {
        if (feof(ctx.fin)) break;
        available_in = fread(ctx.input_buffer, 1, BUFFER_SIZE, ctx.fin);
        next_in = ctx.input_buffer;
        if (ferror(ctx.fin)) break;
      } else if (result == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT) {
        fwrite(ctx.output_buffer, 1, BUFFER_SIZE, ctx.fout);
        if (ferror(ctx.fout)) break;
        available_out = BUFFER_SIZE;
        next_out = ctx.output_buffer;
      } else {
        break;
      }
      result = BrotliDecoderDecompressStream(
          ctx.decoder, &available_in, &next_in, &available_out, &next_out, 0);
    }
    if (next_out != ctx.output_buffer) {
      fwrite(ctx.output_buffer, 1, next_out - ctx.output_buffer, ctx.fout);
    }
    if ((result == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT) || ferror(ctx.fout)) {
      fail(&ctx, "failed to write output");
    } else if (result != BROTLI_DECODER_RESULT_SUCCESS) {
      fail(&ctx, "corrupt input");
    }
    cleanup(&ctx);
    return 0;
  }
  

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