text: // Copyright 2016 The PDFium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include <cstdint>
  
  #include "core/fpdfapi/parser/cpdf_stream.h"
  #include "core/fpdfapi/parser/cpdf_stream_acc.h"
  #include "core/fxcodec/JBig2_DocumentContext.h"
  #include "core/fxcodec/codec/ccodec_jbig2module.h"
  #include "core/fxcodec/jbig2/JBig2_Context.h"
  #include "core/fxge/dib/cfx_dibitmap.h"
  #include "core/fxge/fx_dib.h"
  #include "third_party/base/ptr_util.h"
  
  static uint32_t GetInteger(const uint8_t* data) {
    return data[0] | data[1] << 8 | data[2] << 16 | data[3] << 24;
  }
  
  extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
    const size_t kParameterSize = 8;
    if (size < kParameterSize)
      return 0;
  
    uint32_t width = GetInteger(data);
    uint32_t height = GetInteger(data + 4);
    size -= kParameterSize;
    data += kParameterSize;
  
    auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
    if (!bitmap->Create(width, height, FXDIB_1bppRgb))
      return 0;
  
    auto stream = pdfium::MakeUnique<CPDF_Stream>();
    stream->AsStream()->SetData(data, size);
  
    auto src_stream = pdfium::MakeRetain<CPDF_StreamAcc>(stream->AsStream());
    src_stream->LoadAllData(true);
  
    CCodec_Jbig2Module module;
    CCodec_Jbig2Context jbig2_context;
    std::unique_ptr<JBig2_DocumentContext> document_context;
    FXCODEC_STATUS status = module.StartDecode(
        &jbig2_context, &document_context, width, height, src_stream, nullptr,
        bitmap->GetBuffer(), bitmap->GetPitch(), nullptr);
  
    while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
      status = module.ContinueDecode(&jbig2_context, nullptr);
    return 0;
  }
  