1 // Copyright 2016 The PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include <cstdint>
6
7 #include "core/fpdfapi/parser/cpdf_stream.h"
8 #include "core/fpdfapi/parser/cpdf_stream_acc.h"
9 #include "core/fxcodec/JBig2_DocumentContext.h"
10 #include "core/fxcodec/codec/ccodec_jbig2module.h"
11 #include "core/fxcodec/jbig2/JBig2_Context.h"
12 #include "core/fxcrt/fx_safe_types.h"
13 #include "core/fxge/dib/cfx_dibitmap.h"
14 #include "core/fxge/fx_dib.h"
15 #include "third_party/base/ptr_util.h"
16
GetInteger(const uint8_t * data)17 static uint32_t GetInteger(const uint8_t* data) {
18 return data[0] | data[1] << 8 | data[2] << 16 | data[3] << 24;
19 }
20
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)21 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
22 const size_t kParameterSize = 8;
23 if (size < kParameterSize)
24 return 0;
25
26 uint32_t width = GetInteger(data);
27 uint32_t height = GetInteger(data + 4);
28 size -= kParameterSize;
29 data += kParameterSize;
30
31 static constexpr uint32_t kMemLimit = 512000000; // 512 MB
32 static constexpr uint32_t k1bppRgbComponents = 4; // From CFX_DIBitmap impl.
33 FX_SAFE_UINT32 mem = width;
34 mem *= height;
35 mem *= k1bppRgbComponents;
36 if (!mem.IsValid() || mem.ValueOrDie() > kMemLimit)
37 return 0;
38
39 auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
40 if (!bitmap->Create(width, height, FXDIB_1bppRgb))
41 return 0;
42
43 auto stream = pdfium::MakeUnique<CPDF_Stream>();
44 stream->AsStream()->SetData(data, size);
45
46 auto src_stream = pdfium::MakeRetain<CPDF_StreamAcc>(stream->AsStream());
47 src_stream->LoadAllDataRaw();
48
49 CCodec_Jbig2Module module;
50 CCodec_Jbig2Context jbig2_context;
51 std::unique_ptr<JBig2_DocumentContext> document_context;
52 FXCODEC_STATUS status = module.StartDecode(
53 &jbig2_context, &document_context, width, height, src_stream, nullptr,
54 bitmap->GetBuffer(), bitmap->GetPitch(), nullptr);
55
56 while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
57 status = module.ContinueDecode(&jbig2_context, nullptr);
58 return 0;
59 }
60