summaryrefslogtreecommitdiff
path: root/core/fxcodec/lgif/fx_gif.cpp
diff options
context:
space:
mode:
authorRyan Harrison <rharrison@chromium.org>2017-09-22 11:05:13 -0400
committerChromium commit bot <commit-bot@chromium.org>2017-09-22 15:13:06 +0000
commit92827b695a69c7a3fd5940dc0aa1713fe3f3ee96 (patch)
tree1698c9f11f3709683cd4eea615b9a4d970409e3e /core/fxcodec/lgif/fx_gif.cpp
parent73bed4ef57444a2ea066d532a8a82b230fd206d9 (diff)
downloadpdfium-92827b695a69c7a3fd5940dc0aa1713fe3f3ee96.tar.xz
Move C-style functions into CGifContext
There are a number of functions in fx_gix.h/.cpp that take in a pointer to a CGifContext as their first parameter. Moving these to be methods in that class. BUG=pdfium:902 Change-Id: I8c583ab9e42dda4241aa8a6f865408a94fa6d273 Reviewed-on: https://pdfium-review.googlesource.com/14670 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
Diffstat (limited to 'core/fxcodec/lgif/fx_gif.cpp')
-rw-r--r--core/fxcodec/lgif/fx_gif.cpp484
1 files changed, 0 insertions, 484 deletions
diff --git a/core/fxcodec/lgif/fx_gif.cpp b/core/fxcodec/lgif/fx_gif.cpp
index ea78259420..6e1c26ed12 100644
--- a/core/fxcodec/lgif/fx_gif.cpp
+++ b/core/fxcodec/lgif/fx_gif.cpp
@@ -23,168 +23,6 @@ static_assert(sizeof(GifGCE) == 5, "GifGCE should have a size of 5");
static_assert(sizeof(GifHeader) == 6, "GifHeader should have a size of 6");
static_assert(sizeof(GifLSD) == 7, "GifLSD should have a size of 7");
-namespace {
-
-uint8_t* gif_read_data(CGifContext* context,
- uint8_t** des_buf_pp,
- uint32_t data_size) {
- if (!context || context->avail_in < context->skip_size + data_size)
- return nullptr;
-
- *des_buf_pp = context->next_in + context->skip_size;
- context->skip_size += data_size;
- return *des_buf_pp;
-}
-
-void gif_save_decoding_status(CGifContext* context, int32_t status) {
- context->decode_status = status;
- context->next_in += context->skip_size;
- context->avail_in -= context->skip_size;
- context->skip_size = 0;
-}
-
-GifDecodeStatus gif_decode_extension(CGifContext* context) {
- uint8_t* data_size_ptr = nullptr;
- uint8_t* data_ptr = nullptr;
- uint32_t skip_size_org = context->skip_size;
- switch (context->decode_status) {
- case GIF_D_STATUS_EXT_CE: {
- if (!gif_read_data(context, &data_size_ptr, 1)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- context->cmt_data.clear();
- while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
- uint8_t data_size = *data_size_ptr;
- if (!gif_read_data(context, &data_ptr, *data_size_ptr) ||
- !gif_read_data(context, &data_size_ptr, 1)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- context->cmt_data += ByteString(data_ptr, data_size);
- }
- break;
- }
- case GIF_D_STATUS_EXT_PTE: {
- GifPTE* gif_pte = nullptr;
- if (!gif_read_data(context, reinterpret_cast<uint8_t**>(&gif_pte), 13))
- return GifDecodeStatus::Unfinished;
-
- context->m_GifGCE = nullptr;
- if (!gif_read_data(context, &data_size_ptr, 1)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
- if (!gif_read_data(context, &data_ptr, *data_size_ptr) ||
- !gif_read_data(context, &data_size_ptr, 1)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- }
- break;
- }
- case GIF_D_STATUS_EXT_GCE: {
- GifGCE* gif_gce_ptr = nullptr;
- if (!gif_read_data(context, reinterpret_cast<uint8_t**>(&gif_gce_ptr), 6))
- return GifDecodeStatus::Unfinished;
-
- if (!context->m_GifGCE.get())
- context->m_GifGCE = pdfium::MakeUnique<GifGCE>();
- context->m_GifGCE->block_size = gif_gce_ptr->block_size;
- context->m_GifGCE->gce_flag = gif_gce_ptr->gce_flag;
- context->m_GifGCE->delay_time = GetWord_LSBFirst(
- reinterpret_cast<uint8_t*>(&gif_gce_ptr->delay_time));
- context->m_GifGCE->trans_index = gif_gce_ptr->trans_index;
- break;
- }
- default: {
- if (context->decode_status == GIF_D_STATUS_EXT_PTE)
- context->m_GifGCE = nullptr;
- if (!gif_read_data(context, &data_size_ptr, 1))
- return GifDecodeStatus::Unfinished;
-
- while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
- if (!gif_read_data(context, &data_ptr, *data_size_ptr) ||
- !gif_read_data(context, &data_size_ptr, 1)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- }
- }
- }
- gif_save_decoding_status(context, GIF_D_STATUS_SIG);
- return GifDecodeStatus::Success;
-}
-
-GifDecodeStatus gif_decode_image_info(CGifContext* context) {
- if (context->width == 0 || context->height == 0) {
- context->AddError("No Image Header Info");
- return GifDecodeStatus::Error;
- }
- uint32_t skip_size_org = context->skip_size;
- GifImageInfo* gif_img_info_ptr = nullptr;
- if (!gif_read_data(context, reinterpret_cast<uint8_t**>(&gif_img_info_ptr),
- 9))
- return GifDecodeStatus::Unfinished;
-
- auto gif_image = pdfium::MakeUnique<GifImage>();
- gif_image->m_ImageInfo.left =
- GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->left));
- gif_image->m_ImageInfo.top =
- GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->top));
- gif_image->m_ImageInfo.width =
- GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->width));
- gif_image->m_ImageInfo.height =
- GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->height));
- gif_image->m_ImageInfo.local_flag = gif_img_info_ptr->local_flag;
- if (gif_image->m_ImageInfo.left + gif_image->m_ImageInfo.width >
- context->width ||
- gif_image->m_ImageInfo.top + gif_image->m_ImageInfo.height >
- context->height) {
- context->AddError("Image Data Out Of LSD, The File May Be Corrupt");
- return GifDecodeStatus::Error;
- }
- GifLF* gif_img_info_lf_ptr = (GifLF*)&gif_img_info_ptr->local_flag;
- if (gif_img_info_lf_ptr->local_pal) {
- gif_image->local_pallette_exp = gif_img_info_lf_ptr->pal_bits;
- int32_t loc_pal_size = (2 << gif_img_info_lf_ptr->pal_bits) * 3;
- uint8_t* loc_pal_ptr = nullptr;
- if (!gif_read_data(context, &loc_pal_ptr, loc_pal_size)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- gif_image->m_LocalPalettes = std::vector<GifPalette>(loc_pal_size / 3);
- std::copy(loc_pal_ptr, loc_pal_ptr + loc_pal_size,
- reinterpret_cast<uint8_t*>(gif_image->m_LocalPalettes.data()));
- }
- uint8_t* code_size_ptr = nullptr;
- if (!gif_read_data(context, &code_size_ptr, 1)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- gif_image->image_code_exp = *code_size_ptr;
- context->RecordCurrentPosition(&gif_image->image_data_pos);
- gif_image->image_data_pos += context->skip_size;
- gif_image->m_ImageGCE = nullptr;
- if (context->m_GifGCE.get()) {
- gif_image->m_ImageGCE = std::move(context->m_GifGCE);
- context->m_GifGCE = nullptr;
- }
- context->m_Images.push_back(std::move(gif_image));
- gif_save_decoding_status(context, GIF_D_STATUS_IMG_DATA);
- return GifDecodeStatus::Success;
-}
-
-void gif_decoding_failure_at_tail_cleanup(CGifContext* context,
- GifImage* gif_image_ptr) {
- gif_image_ptr->m_ImageRowBuf.clear();
- gif_save_decoding_status(context, GIF_D_STATUS_TAIL);
- context->AddError("Decode Image Data Error");
-}
-
-} // namespace
-
GifImage::GifImage() {}
GifImage::~GifImage() {}
@@ -369,325 +207,3 @@ GifDecodeStatus CGifLZWDecoder::Decode(uint8_t* des_buf, uint32_t* des_size) {
}
return GifDecodeStatus::Error;
}
-
-GifDecodeStatus gif_read_header(CGifContext* context) {
- if (!context)
- return GifDecodeStatus::Error;
-
- uint32_t skip_size_org = context->skip_size;
- GifHeader* gif_header_ptr = nullptr;
- if (!gif_read_data(context, reinterpret_cast<uint8_t**>(&gif_header_ptr), 6))
- return GifDecodeStatus::Unfinished;
-
- if (strncmp(gif_header_ptr->signature, GIF_SIGNATURE, 3) != 0 ||
- gif_header_ptr->version[0] != '8' || gif_header_ptr->version[2] != 'a') {
- context->AddError("Not A Gif Image");
- return GifDecodeStatus::Error;
- }
- GifLSD* gif_lsd_ptr = nullptr;
- if (!gif_read_data(context, reinterpret_cast<uint8_t**>(&gif_lsd_ptr), 7)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- if (reinterpret_cast<GifGF*>(&gif_lsd_ptr->global_flag)->global_pal) {
- context->global_pal_exp =
- reinterpret_cast<GifGF*>(&gif_lsd_ptr->global_flag)->pal_bits;
- int32_t global_pal_size = (2 << context->global_pal_exp) * 3;
- uint8_t* global_pal_ptr = nullptr;
- if (!gif_read_data(context, &global_pal_ptr, global_pal_size)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- context->global_sort_flag = ((GifGF*)&gif_lsd_ptr->global_flag)->sort_flag;
- context->global_color_resolution =
- ((GifGF*)&gif_lsd_ptr->global_flag)->color_resolution;
- context->m_GlobalPalette.resize(global_pal_size / 3);
- memcpy(context->m_GlobalPalette.data(), global_pal_ptr, global_pal_size);
- }
- context->width =
- (int)GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_lsd_ptr->width));
- context->height =
- (int)GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_lsd_ptr->height));
- context->bc_index = gif_lsd_ptr->bc_index;
- context->pixel_aspect = gif_lsd_ptr->pixel_aspect;
- return GifDecodeStatus::Success;
-}
-
-GifDecodeStatus gif_get_frame(CGifContext* context) {
- if (!context)
- return GifDecodeStatus::Error;
-
- GifDecodeStatus ret = GifDecodeStatus::Success;
- while (true) {
- switch (context->decode_status) {
- case GIF_D_STATUS_TAIL:
- return GifDecodeStatus::Success;
- case GIF_D_STATUS_SIG: {
- uint8_t* sig_ptr = nullptr;
- if (!gif_read_data(context, &sig_ptr, 1))
- return GifDecodeStatus::Unfinished;
-
- switch (*sig_ptr) {
- case GIF_SIG_EXTENSION:
- gif_save_decoding_status(context, GIF_D_STATUS_EXT);
- continue;
- case GIF_SIG_IMAGE:
- gif_save_decoding_status(context, GIF_D_STATUS_IMG_INFO);
- continue;
- case GIF_SIG_TRAILER:
- gif_save_decoding_status(context, GIF_D_STATUS_TAIL);
- return GifDecodeStatus::Success;
- default:
- if (context->avail_in) {
- // The Gif File has non_standard Tag!
- gif_save_decoding_status(context, GIF_D_STATUS_SIG);
- continue;
- }
- // The Gif File Doesn't have Trailer Tag!
- return GifDecodeStatus::Success;
- }
- }
- case GIF_D_STATUS_EXT: {
- uint8_t* ext_ptr = nullptr;
- if (!gif_read_data(context, &ext_ptr, 1))
- return GifDecodeStatus::Unfinished;
-
- switch (*ext_ptr) {
- case GIF_BLOCK_CE:
- gif_save_decoding_status(context, GIF_D_STATUS_EXT_CE);
- continue;
- case GIF_BLOCK_GCE:
- gif_save_decoding_status(context, GIF_D_STATUS_EXT_GCE);
- continue;
- case GIF_BLOCK_PTE:
- gif_save_decoding_status(context, GIF_D_STATUS_EXT_PTE);
- continue;
- default: {
- int32_t status = GIF_D_STATUS_EXT_UNE;
- if (*ext_ptr == GIF_BLOCK_PTE) {
- status = GIF_D_STATUS_EXT_PTE;
- }
- gif_save_decoding_status(context, status);
- continue;
- }
- }
- }
- case GIF_D_STATUS_IMG_INFO: {
- ret = gif_decode_image_info(context);
- if (ret != GifDecodeStatus::Success)
- return ret;
-
- continue;
- }
- case GIF_D_STATUS_IMG_DATA: {
- uint8_t* data_size_ptr = nullptr;
- uint8_t* data_ptr = nullptr;
- uint32_t skip_size_org = context->skip_size;
- if (!gif_read_data(context, &data_size_ptr, 1))
- return GifDecodeStatus::Unfinished;
-
- while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
- if (!gif_read_data(context, &data_ptr, *data_size_ptr)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- gif_save_decoding_status(context, GIF_D_STATUS_IMG_DATA);
- skip_size_org = context->skip_size;
- if (!gif_read_data(context, &data_size_ptr, 1))
- return GifDecodeStatus::Unfinished;
- }
- gif_save_decoding_status(context, GIF_D_STATUS_SIG);
- continue;
- }
- default: {
- ret = gif_decode_extension(context);
- if (ret != GifDecodeStatus::Success)
- return ret;
- break;
- }
- }
- }
- return GifDecodeStatus::Success;
-}
-
-GifDecodeStatus gif_load_frame(CGifContext* context, int32_t frame_num) {
- if (!context || !pdfium::IndexInBounds(context->m_Images, frame_num))
- return GifDecodeStatus::Error;
-
- uint8_t* data_size_ptr = nullptr;
- uint8_t* data_ptr = nullptr;
- uint32_t skip_size_org = context->skip_size;
- GifImage* gif_image_ptr = context->m_Images[frame_num].get();
- uint32_t gif_img_row_bytes = gif_image_ptr->m_ImageInfo.width;
- if (gif_img_row_bytes == 0) {
- context->AddError("Error Invalid Number of Row Bytes");
- return GifDecodeStatus::Error;
- }
- if (context->decode_status == GIF_D_STATUS_TAIL) {
- gif_image_ptr->m_ImageRowBuf.resize(gif_img_row_bytes);
- GifGCE* gif_img_gce_ptr = gif_image_ptr->m_ImageGCE.get();
- int32_t loc_pal_num =
- ((GifLF*)&gif_image_ptr->m_ImageInfo.local_flag)->local_pal
- ? (2 << ((GifLF*)&gif_image_ptr->m_ImageInfo.local_flag)->pal_bits)
- : 0;
- context->avail_in = 0;
- GifPalette* pLocalPalette = gif_image_ptr->m_LocalPalettes.empty()
- ? nullptr
- : gif_image_ptr->m_LocalPalettes.data();
- if (!gif_img_gce_ptr) {
- bool bRes = context->GetRecordPosition(
- gif_image_ptr->image_data_pos, gif_image_ptr->m_ImageInfo.left,
- gif_image_ptr->m_ImageInfo.top, gif_image_ptr->m_ImageInfo.width,
- gif_image_ptr->m_ImageInfo.height, loc_pal_num, pLocalPalette, 0, 0,
- -1, 0,
- (bool)((GifLF*)&gif_image_ptr->m_ImageInfo.local_flag)->interlace);
- if (!bRes) {
- gif_image_ptr->m_ImageRowBuf.clear();
- context->AddError("Error Read Record Position Data");
- return GifDecodeStatus::Error;
- }
- } else {
- bool bRes = context->GetRecordPosition(
- gif_image_ptr->image_data_pos, gif_image_ptr->m_ImageInfo.left,
- gif_image_ptr->m_ImageInfo.top, gif_image_ptr->m_ImageInfo.width,
- gif_image_ptr->m_ImageInfo.height, loc_pal_num, pLocalPalette,
- (int32_t)gif_image_ptr->m_ImageGCE->delay_time,
- (bool)((GifCEF*)&gif_image_ptr->m_ImageGCE->gce_flag)->user_input,
- ((GifCEF*)&gif_image_ptr->m_ImageGCE->gce_flag)->transparency
- ? (int32_t)gif_image_ptr->m_ImageGCE->trans_index
- : -1,
- (int32_t)((GifCEF*)&gif_image_ptr->m_ImageGCE->gce_flag)
- ->disposal_method,
- (bool)((GifLF*)&gif_image_ptr->m_ImageInfo.local_flag)->interlace);
- if (!bRes) {
- gif_image_ptr->m_ImageRowBuf.clear();
- context->AddError("Error Read Record Position Data");
- return GifDecodeStatus::Error;
- }
- }
- if (gif_image_ptr->image_code_exp > GIF_MAX_LZW_EXP) {
- gif_image_ptr->m_ImageRowBuf.clear();
- context->AddError("Error Invalid Code Size");
- return GifDecodeStatus::Error;
- }
- if (!context->m_ImgDecoder.get())
- context->m_ImgDecoder =
- pdfium::MakeUnique<CGifLZWDecoder>(context->m_szLastError);
- context->m_ImgDecoder->InitTable(!gif_image_ptr->m_LocalPalettes.empty()
- ? gif_image_ptr->local_pallette_exp
- : context->global_pal_exp,
- gif_image_ptr->image_code_exp);
- context->img_row_offset = 0;
- context->img_row_avail_size = 0;
- context->img_pass_num = 0;
- gif_image_ptr->image_row_num = 0;
- gif_save_decoding_status(context, GIF_D_STATUS_IMG_DATA);
- }
- CGifLZWDecoder* img_decoder_ptr = context->m_ImgDecoder.get();
- if (context->decode_status == GIF_D_STATUS_IMG_DATA) {
- if (!gif_read_data(context, &data_size_ptr, 1))
- return GifDecodeStatus::Unfinished;
-
- if (*data_size_ptr != GIF_BLOCK_TERMINAL) {
- if (!gif_read_data(context, &data_ptr, *data_size_ptr)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- img_decoder_ptr->Input(data_ptr, *data_size_ptr);
- gif_save_decoding_status(context, GIF_D_STATUS_IMG_DATA);
- context->img_row_offset += context->img_row_avail_size;
- context->img_row_avail_size = gif_img_row_bytes - context->img_row_offset;
- GifDecodeStatus ret = img_decoder_ptr->Decode(
- gif_image_ptr->m_ImageRowBuf.data() + context->img_row_offset,
- &context->img_row_avail_size);
- if (ret == GifDecodeStatus::Error) {
- gif_decoding_failure_at_tail_cleanup(context, gif_image_ptr);
- return GifDecodeStatus::Error;
- }
- while (ret != GifDecodeStatus::Error) {
- if (ret == GifDecodeStatus::Success) {
- context->ReadScanline(gif_image_ptr->image_row_num,
- gif_image_ptr->m_ImageRowBuf.data());
- gif_image_ptr->m_ImageRowBuf.clear();
- gif_save_decoding_status(context, GIF_D_STATUS_TAIL);
- return GifDecodeStatus::Success;
- }
- if (ret == GifDecodeStatus::Unfinished) {
- ASSERT(img_decoder_ptr->GetAvailInput() == 0);
- skip_size_org = context->skip_size;
- if (!gif_read_data(context, &data_size_ptr, 1))
- return GifDecodeStatus::Unfinished;
-
- if (*data_size_ptr != GIF_BLOCK_TERMINAL) {
- if (!gif_read_data(context, &data_ptr, *data_size_ptr)) {
- context->skip_size = skip_size_org;
- return GifDecodeStatus::Unfinished;
- }
- img_decoder_ptr->Input(data_ptr, *data_size_ptr);
- gif_save_decoding_status(context, GIF_D_STATUS_IMG_DATA);
- context->img_row_offset += context->img_row_avail_size;
- context->img_row_avail_size =
- gif_img_row_bytes - context->img_row_offset;
- ret = img_decoder_ptr->Decode(
- gif_image_ptr->m_ImageRowBuf.data() + context->img_row_offset,
- &context->img_row_avail_size);
- }
- }
- if (ret == GifDecodeStatus::InsufficientDestSize) {
- if (((GifLF*)&gif_image_ptr->m_ImageInfo.local_flag)->interlace) {
- context->ReadScanline(gif_image_ptr->image_row_num,
- gif_image_ptr->m_ImageRowBuf.data());
- gif_image_ptr->image_row_num +=
- s_gif_interlace_step[context->img_pass_num];
- if (gif_image_ptr->image_row_num >=
- (int32_t)gif_image_ptr->m_ImageInfo.height) {
- context->img_pass_num++;
- if (context->img_pass_num == FX_ArraySize(s_gif_interlace_step)) {
- gif_decoding_failure_at_tail_cleanup(context, gif_image_ptr);
- return GifDecodeStatus::Error;
- }
- gif_image_ptr->image_row_num =
- s_gif_interlace_step[context->img_pass_num] / 2;
- }
- } else {
- context->ReadScanline(gif_image_ptr->image_row_num++,
- gif_image_ptr->m_ImageRowBuf.data());
- }
- context->img_row_offset = 0;
- context->img_row_avail_size = gif_img_row_bytes;
- ret = img_decoder_ptr->Decode(
- gif_image_ptr->m_ImageRowBuf.data() + context->img_row_offset,
- &context->img_row_avail_size);
- }
- if (ret == GifDecodeStatus::Error) {
- gif_decoding_failure_at_tail_cleanup(context, gif_image_ptr);
- return GifDecodeStatus::Error;
- }
- }
- }
- gif_save_decoding_status(context, GIF_D_STATUS_TAIL);
- }
- context->AddError("Decode Image Data Error");
- return GifDecodeStatus::Error;
-}
-
-void gif_input_buffer(CGifContext* context,
- uint8_t* src_buf,
- uint32_t src_size) {
- context->next_in = src_buf;
- context->avail_in = src_size;
- context->skip_size = 0;
-}
-
-uint32_t gif_get_avail_input(CGifContext* context, uint8_t** avail_buf_ptr) {
- if (avail_buf_ptr) {
- *avail_buf_ptr = nullptr;
- if (context->avail_in > 0)
- *avail_buf_ptr = context->next_in;
- }
- return context->avail_in;
-}
-
-int32_t gif_get_frame_num(CGifContext* context) {
- return pdfium::CollectionSize<int32_t>(context->m_Images);
-}