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-rw-r--r--core/fxcodec/gif/cfx_gifcontext.cpp31
-rw-r--r--core/fxcodec/gif/cfx_gifcontext_unittest.cpp83
2 files changed, 54 insertions, 60 deletions
diff --git a/core/fxcodec/gif/cfx_gifcontext.cpp b/core/fxcodec/gif/cfx_gifcontext.cpp
index 28bcad9ceb..ca2e7c3c88 100644
--- a/core/fxcodec/gif/cfx_gifcontext.cpp
+++ b/core/fxcodec/gif/cfx_gifcontext.cpp
@@ -390,9 +390,14 @@ CFX_GifDecodeStatus CFX_GifContext::ReadLogicalScreenDescriptor() {
}
if (lsd->global_flags.global_pal) {
- uint32_t global_pal_size = unsigned(2 << lsd->global_flags.pal_bits) * 3u;
- uint8_t* global_pal = nullptr;
- if (!ReadData(&global_pal, global_pal_size)) {
+ uint32_t palette_count = unsigned(2 << lsd->global_flags.pal_bits);
+ if (lsd->bc_index >= palette_count)
+ return CFX_GifDecodeStatus::Error;
+ bc_index_ = lsd->bc_index;
+
+ uint32_t palette_size = palette_count * 3u;
+ uint8_t* palette = nullptr;
+ if (!ReadData(&palette, palette_size)) {
skip_size_ = skip_size_org;
return CFX_GifDecodeStatus::Unfinished;
}
@@ -400,15 +405,15 @@ CFX_GifDecodeStatus CFX_GifContext::ReadLogicalScreenDescriptor() {
global_pal_exp_ = lsd->global_flags.pal_bits;
global_sort_flag_ = lsd->global_flags.sort_flag;
global_color_resolution_ = lsd->global_flags.color_resolution;
- global_palette_.resize(global_pal_size / 3);
- memcpy(global_palette_.data(), global_pal, global_pal_size);
+ global_palette_.resize(palette_count);
+ memcpy(global_palette_.data(), palette, palette_size);
}
width_ = static_cast<int>(
- FXWORD_GET_MSBFIRST(reinterpret_cast<uint8_t*>(&lsd->width)));
+ FXWORD_GET_LSBFIRST(reinterpret_cast<uint8_t*>(&lsd->width)));
height_ = static_cast<int>(
- FXWORD_GET_MSBFIRST(reinterpret_cast<uint8_t*>(&lsd->height)));
- bc_index_ = lsd->bc_index;
+ FXWORD_GET_LSBFIRST(reinterpret_cast<uint8_t*>(&lsd->height)));
+
pixel_aspect_ = lsd->pixel_aspect;
return CFX_GifDecodeStatus::Success;
}
@@ -544,9 +549,19 @@ CFX_GifDecodeStatus CFX_GifContext::DecodeImageInfo() {
gif_image->data_pos += skip_size_;
gif_image->image_GCE = nullptr;
if (graphic_control_extension_.get()) {
+ if (graphic_control_extension_->gce_flags.transparency) {
+ // Need to test that the color that is going to be transparent is actually
+ // in the palette being used.
+ if (graphic_control_extension_->trans_index >=
+ 2 << (gif_image->local_palettes.empty()
+ ? global_pal_exp_
+ : gif_image->local_pallette_exp))
+ return CFX_GifDecodeStatus::Error;
+ }
gif_image->image_GCE = std::move(graphic_control_extension_);
graphic_control_extension_ = nullptr;
}
+
images_.push_back(std::move(gif_image));
SaveDecodingStatus(GIF_D_STATUS_IMG_DATA);
return CFX_GifDecodeStatus::Success;
diff --git a/core/fxcodec/gif/cfx_gifcontext_unittest.cpp b/core/fxcodec/gif/cfx_gifcontext_unittest.cpp
index 98b8ec5cd0..c5d3ac90c7 100644
--- a/core/fxcodec/gif/cfx_gifcontext_unittest.cpp
+++ b/core/fxcodec/gif/cfx_gifcontext_unittest.cpp
@@ -168,10 +168,9 @@ TEST(CFX_GifContext, ReadLocalScreenDescriptor) {
}
// LSD with all the values zero'd
{
- CFX_GifLocalScreenDescriptor lsd;
+ uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
memset(&lsd, 0, sizeof(CFX_GifLocalScreenDescriptor));
- context.SetInputBuffer(reinterpret_cast<uint8_t*>(&lsd),
- sizeof(CFX_GifLocalScreenDescriptor));
+ context.SetInputBuffer(lsd, sizeof(CFX_GifLocalScreenDescriptor));
EXPECT_EQ(CFX_GifDecodeStatus::Success,
context.ReadLogicalScreenDescriptor());
@@ -184,9 +183,9 @@ TEST(CFX_GifContext, ReadLocalScreenDescriptor) {
}
// LSD with no global palette
{
- CFX_GifLocalScreenDescriptor lsd{0x0A00, 0x000F, {0, 0, 0, 0}, 1, 2};
- context.SetInputBuffer(reinterpret_cast<uint8_t*>(&lsd),
- sizeof(CFX_GifLocalScreenDescriptor));
+ uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)] = {0x0A, 0x00, 0x00, 0x0F,
+ 0x00, 0x01, 0x02};
+ context.SetInputBuffer(lsd, sizeof(CFX_GifLocalScreenDescriptor));
EXPECT_EQ(CFX_GifDecodeStatus::Success,
context.ReadLogicalScreenDescriptor());
@@ -194,14 +193,14 @@ TEST(CFX_GifContext, ReadLocalScreenDescriptor) {
EXPECT_EQ(sizeof(CFX_GifLocalScreenDescriptor), context.skip_size_);
EXPECT_EQ(0x000A, context.width_);
EXPECT_EQ(0x0F00, context.height_);
- EXPECT_EQ(1u, context.bc_index_);
+ EXPECT_EQ(0u, context.bc_index_); // bc_index_ is 0 if no global palette
EXPECT_EQ(2u, context.pixel_aspect_);
}
// LSD with global palette bit set, but no global palette
{
- CFX_GifLocalScreenDescriptor lsd{0x0A00, 0x000F, {0, 0, 0, 1}, 1, 2};
- context.SetInputBuffer(reinterpret_cast<uint8_t*>(&lsd),
- sizeof(CFX_GifLocalScreenDescriptor));
+ uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)] = {0x0A, 0x00, 0x00, 0x0F,
+ 0x80, 0x01, 0x02};
+ context.SetInputBuffer(lsd, sizeof(CFX_GifLocalScreenDescriptor));
EXPECT_EQ(CFX_GifDecodeStatus::Unfinished,
context.ReadLogicalScreenDescriptor());
@@ -210,14 +209,11 @@ TEST(CFX_GifContext, ReadLocalScreenDescriptor) {
}
// LSD with global palette
{
- CFX_GifLocalScreenDescriptor lsd = {0x0A00, 0x000F, {1, 1, 2, 1}, 1, 2};
- CFX_GifPalette palette[4] = {{0, 0, 0}, {1, 1, 1}, {1, 0, 0}, {0, 0, 1}};
struct {
- CFX_GifLocalScreenDescriptor lsd;
- CFX_GifPalette palette[4];
- } data;
- memcpy(&data.lsd, &lsd, sizeof(data.lsd));
- memcpy(&data.palette, &palette, sizeof(data.lsd));
+ uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
+ uint8_t palette[4 * sizeof(CFX_GifPalette)];
+ } data = {{0x0A, 0x00, 0x00, 0x0F, 0xA9, 0x01, 0x02},
+ {0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1}};
context.SetInputBuffer(reinterpret_cast<uint8_t*>(&data), sizeof(data));
EXPECT_EQ(CFX_GifDecodeStatus::Success,
@@ -228,6 +224,7 @@ TEST(CFX_GifContext, ReadLocalScreenDescriptor) {
EXPECT_EQ(0x0F00, context.height_);
EXPECT_EQ(1u, context.bc_index_);
EXPECT_EQ(2u, context.pixel_aspect_);
+
EXPECT_EQ(1u, context.global_pal_exp_);
EXPECT_EQ(1, context.global_sort_flag_);
EXPECT_EQ(2, context.global_color_resolution_);
@@ -240,19 +237,16 @@ TEST(CFX_GifContext, ReadHeader) {
CFX_GifContextForTest context(nullptr, nullptr);
// Bad signature
{
- uint8_t signature[] = {'N', 'O', 'T', 'G', 'I', 'F'};
- CFX_GifLocalScreenDescriptor lsd{0x0A00, 0x000F, {0, 0, 0, 0}, 1, 2};
struct {
uint8_t signature[6];
- CFX_GifLocalScreenDescriptor lsd;
- } data;
- memcpy(&data.signature, signature, sizeof(data.signature));
- memcpy(&data.lsd, &lsd, sizeof(data.lsd));
+ uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
+ } data = {{'N', 'O', 'T', 'G', 'I', 'F'},
+ {0x0A, 0x00, 0x00, 0x0F, 0x00, 0x01, 0x02}};
context.SetInputBuffer(reinterpret_cast<uint8_t*>(&data), sizeof(data));
EXPECT_EQ(CFX_GifDecodeStatus::Error, context.ReadHeader());
- EXPECT_EQ(sizeof(signature), context.skip_size_);
+ EXPECT_EQ(sizeof(data.signature), context.skip_size_);
}
// Short after signature
{
@@ -266,15 +260,11 @@ TEST(CFX_GifContext, ReadHeader) {
}
// Success without global palette
{
- uint8_t signature[] = {'G', 'I', 'F', '8', '7', 'a'};
- CFX_GifLocalScreenDescriptor lsd{0x0A00, 0x000F, {0, 0, 0, 0}, 1, 2};
struct {
uint8_t signature[6];
- CFX_GifLocalScreenDescriptor lsd;
- } data;
- memcpy(&data.signature, signature, sizeof(data.signature));
- memcpy(&data.lsd, &lsd, sizeof(data.lsd));
-
+ uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
+ } data = {{'G', 'I', 'F', '8', '7', 'a'},
+ {0x0A, 0x00, 0x00, 0x0F, 0x00, 0x01, 0x02}};
context.SetInputBuffer(reinterpret_cast<uint8_t*>(&data), sizeof(data));
EXPECT_EQ(CFX_GifDecodeStatus::Success, context.ReadHeader());
@@ -282,42 +272,31 @@ TEST(CFX_GifContext, ReadHeader) {
EXPECT_EQ(sizeof(data), context.skip_size_);
EXPECT_EQ(0x000A, context.width_);
EXPECT_EQ(0x0F00, context.height_);
- EXPECT_EQ(1u, context.bc_index_);
+ EXPECT_EQ(0u, context.bc_index_); // bc_index_ is 0 if no global palette
EXPECT_EQ(2u, context.pixel_aspect_);
}
// Missing Global Palette
{
- uint8_t signature[] = {'G', 'I', 'F', '8', '7', 'a'};
- CFX_GifLocalScreenDescriptor lsd{0x0A00, 0x000F, {0, 0, 0, 1}, 1, 2};
-
struct {
uint8_t signature[6];
- CFX_GifLocalScreenDescriptor lsd;
- } data;
- memcpy(&data.signature, signature, sizeof(data.signature));
- memcpy(&data.lsd, &lsd, sizeof(data.lsd));
-
+ uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
+ } data = {{'G', 'I', 'F', '8', '7', 'a'},
+ {0x0A, 0x00, 0x00, 0x0F, 0x80, 0x01, 0x02}};
context.SetInputBuffer(reinterpret_cast<uint8_t*>(&data), sizeof(data));
EXPECT_EQ(CFX_GifDecodeStatus::Unfinished, context.ReadHeader());
- EXPECT_EQ(sizeof(signature), context.skip_size_);
+ EXPECT_EQ(sizeof(data.signature), context.skip_size_);
}
// Success with global palette
{
- uint8_t signature[] = {'G', 'I', 'F', '8', '7', 'a'};
- CFX_GifLocalScreenDescriptor lsd = {0x0A00, 0x000F, {1, 1, 2, 1}, 1, 2};
- CFX_GifPalette palette[4] = {{0, 0, 0}, {1, 1, 1}, {1, 0, 0}, {0, 0, 1}};
-
struct {
uint8_t signature[6];
- CFX_GifLocalScreenDescriptor lsd;
- CFX_GifPalette palette[4];
- } data;
- memcpy(&data.signature, signature, sizeof(data.signature));
- memcpy(&data.lsd, &lsd, sizeof(data.lsd));
- memcpy(&data.palette, &palette, sizeof(data.lsd));
-
+ uint8_t lsd[sizeof(CFX_GifLocalScreenDescriptor)];
+ uint8_t palette[4 * sizeof(CFX_GifPalette)];
+ } data = {{'G', 'I', 'F', '8', '7', 'a'},
+ {0x0A, 0x00, 0x00, 0x0F, 0xA9, 0x01, 0x02},
+ {0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1}};
context.SetInputBuffer(reinterpret_cast<uint8_t*>(&data), sizeof(data));
EXPECT_EQ(CFX_GifDecodeStatus::Success, context.ReadHeader());
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 00:46:15 +0000