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-rw-r--r--core/fxcodec/codec/fx_codec_tiff.cpp58
1 files changed, 40 insertions, 18 deletions
diff --git a/core/fxcodec/codec/fx_codec_tiff.cpp b/core/fxcodec/codec/fx_codec_tiff.cpp
index c76a604e4d..c4c745587f 100644
--- a/core/fxcodec/codec/fx_codec_tiff.cpp
+++ b/core/fxcodec/codec/fx_codec_tiff.cpp
@@ -4,8 +4,11 @@
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+#include <limits>
+
#include "core/fxcodec/codec/codec_int.h"
#include "core/fxcodec/fx_codec.h"
+#include "core/fxcrt/fx_safe_types.h"
#include "core/fxge/fx_dib.h"
extern "C" {
@@ -29,7 +32,6 @@ class CCodec_TiffContext {
IFX_SeekableReadStream* io_in() const { return m_io_in; }
uint32_t offset() const { return m_offset; }
void set_offset(uint32_t offset) { m_offset = offset; }
- void increment_offset(uint32_t offset) { m_offset += offset; }
private:
bool IsSupport(const CFX_DIBitmap* pDIBitmap) const;
@@ -89,11 +91,17 @@ TIFFErrorHandler _TIFFerrorHandler = nullptr;
namespace {
tsize_t tiff_read(thandle_t context, tdata_t buf, tsize_t length) {
- CCodec_TiffContext* pTiffContext = (CCodec_TiffContext*)context;
+ CCodec_TiffContext* pTiffContext =
+ reinterpret_cast<CCodec_TiffContext*>(context);
+ FX_SAFE_UINT32 increment = pTiffContext->offset();
+ increment += length;
+ if (!increment.IsValid())
+ return 0;
+
if (!pTiffContext->io_in()->ReadBlock(buf, pTiffContext->offset(), length))
return 0;
- pTiffContext->increment_offset(length);
+ pTiffContext->set_offset(increment.ValueOrDie());
return length;
}
@@ -103,24 +111,37 @@ tsize_t tiff_write(thandle_t context, tdata_t buf, tsize_t length) {
}
toff_t tiff_seek(thandle_t context, toff_t offset, int whence) {
- CCodec_TiffContext* pTiffContext = (CCodec_TiffContext*)context;
+ CCodec_TiffContext* pTiffContext =
+ reinterpret_cast<CCodec_TiffContext*>(context);
+ FX_SAFE_FILESIZE safe_offset = offset;
+ if (!safe_offset.IsValid())
+ return static_cast<toff_t>(-1);
+ FX_FILESIZE file_offset = safe_offset.ValueOrDie();
+
switch (whence) {
- case 0:
- pTiffContext->set_offset(offset);
- break;
- case 1:
- pTiffContext->increment_offset(offset);
- break;
- case 2:
- if (pTiffContext->io_in()->GetSize() < (FX_FILESIZE)offset)
+ case 0: {
+ if (file_offset > pTiffContext->io_in()->GetSize())
return static_cast<toff_t>(-1);
- pTiffContext->set_offset(pTiffContext->io_in()->GetSize() - offset);
- break;
+ pTiffContext->set_offset(file_offset);
+ return pTiffContext->offset();
+ }
+ case 1: {
+ FX_SAFE_UINT32 new_increment = pTiffContext->offset();
+ new_increment += file_offset;
+ if (!new_increment.IsValid())
+ return static_cast<toff_t>(-1);
+ pTiffContext->set_offset(new_increment.ValueOrDie());
+ return pTiffContext->offset();
+ }
+ case 2: {
+ if (pTiffContext->io_in()->GetSize() < file_offset)
+ return static_cast<toff_t>(-1);
+ pTiffContext->set_offset(pTiffContext->io_in()->GetSize() - file_offset);
+ return pTiffContext->offset();
+ }
default:
return static_cast<toff_t>(-1);
}
- ASSERT(pTiffContext->offset() <= (uint32_t)pTiffContext->io_in()->GetSize());
- return pTiffContext->offset();
}
int tiff_close(thandle_t context) {
@@ -128,8 +149,9 @@ int tiff_close(thandle_t context) {
}
toff_t tiff_get_size(thandle_t context) {
- CCodec_TiffContext* pTiffContext = (CCodec_TiffContext*)context;
- return (toff_t)pTiffContext->io_in()->GetSize();
+ CCodec_TiffContext* pTiffContext =
+ reinterpret_cast<CCodec_TiffContext*>(context);
+ return static_cast<toff_t>(pTiffContext->io_in()->GetSize());
}
int tiff_map(thandle_t context, tdata_t*, toff_t*) {