Move core/src/ up to core/.

This CL moves the core/src/ files up to core/ and fixes up the include guards,
includes and build files.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1800523005 .

2 files changed, 1525 insertions, 0 deletions

diff --git a/core/fxcodec/lgif/fx_gif.cpp b/core/fxcodec/lgif/fx_gif.cpp
new file mode 100644
index 0000000000..af447dc84b
--- /dev/null
+++ b/core/fxcodec/lgif/fx_gif.cpp
@@ -0,0 +1,1229 @@
+// Copyright 2014 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.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fxcodec/lgif/fx_gif.h"
+
+#include "core/fxcodec/lbmp/fx_bmp.h"
+
+void CGifLZWDecoder::Input(uint8_t* src_buf, FX_DWORD src_size) {
+  next_in = src_buf;
+  avail_in = src_size;
+}
+FX_DWORD CGifLZWDecoder::GetAvailInput() {
+  return avail_in;
+}
+void CGifLZWDecoder::InitTable(uint8_t code_len) {
+  code_size = code_len;
+  code_clear = 1 << code_size;
+  code_end = code_clear + 1;
+  bits_left = 0;
+  code_store = 0;
+  next_in = NULL;
+  avail_in = 0;
+  stack_size = 0;
+  code_first = 0;
+  ClearTable();
+}
+void CGifLZWDecoder::ClearTable() {
+  code_size_cur = code_size + 1;
+  code_next = code_end + 1;
+  code_old = (FX_WORD)-1;
+  FXSYS_memset(code_table, 0, sizeof(tag_Table) * GIF_MAX_LZW_CODE);
+  FXSYS_memset(stack, 0, GIF_MAX_LZW_CODE);
+  for (FX_WORD i = 0; i < code_clear; i++) {
+    code_table[i].suffix = (uint8_t)i;
+  }
+}
+void CGifLZWDecoder::DecodeString(FX_WORD code) {
+  stack_size = 0;
+  while (TRUE) {
+    ASSERT(code <= code_next);
+    if (code < code_clear || code > code_next) {
+      break;
+    }
+    stack[GIF_MAX_LZW_CODE - 1 - stack_size++] = code_table[code].suffix;
+    code = code_table[code].prefix;
+  }
+  stack[GIF_MAX_LZW_CODE - 1 - stack_size++] = (uint8_t)code;
+  code_first = (uint8_t)code;
+}
+void CGifLZWDecoder::AddCode(FX_WORD prefix_code, uint8_t append_char) {
+  if (code_next == GIF_MAX_LZW_CODE) {
+    return;
+  }
+  code_table[code_next].prefix = prefix_code;
+  code_table[code_next].suffix = append_char;
+  if (++code_next < GIF_MAX_LZW_CODE) {
+    if (code_next >> code_size_cur) {
+      code_size_cur++;
+    }
+  }
+}
+int32_t CGifLZWDecoder::Decode(uint8_t* des_buf, FX_DWORD& des_size) {
+  if (des_size == 0) {
+    return 3;
+  }
+  FX_DWORD i = 0;
+  if (stack_size != 0) {
+    if (des_size < stack_size) {
+      FXSYS_memcpy(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size], des_size);
+      stack_size -= (FX_WORD)des_size;
+      return 3;
+    }
+    FXSYS_memcpy(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size], stack_size);
+    des_buf += stack_size;
+    i += stack_size;
+    stack_size = 0;
+  }
+  FX_WORD code = 0;
+  while (i <= des_size && (avail_in > 0 || bits_left >= code_size_cur)) {
+    if (code_size_cur > 12) {
+      if (err_msg_ptr) {
+        FXSYS_strncpy(err_msg_ptr, "Code Length Out Of Range",
+                      GIF_MAX_ERROR_SIZE - 1);
+      }
+      return 0;
+    }
+    if (avail_in > 0) {
+      code_store |= (*next_in++) << bits_left;
+      avail_in--;
+      bits_left += 8;
+    }
+    while (bits_left >= code_size_cur) {
+      code = (FX_WORD)code_store & ((1 << code_size_cur) - 1);
+      code_store >>= code_size_cur;
+      bits_left -= code_size_cur;
+      if (code == code_clear) {
+        ClearTable();
+        continue;
+      } else if (code == code_end) {
+        des_size = i;
+        return 1;
+      } else {
+        if (code_old != (FX_WORD)-1) {
+          if (code_next < GIF_MAX_LZW_CODE) {
+            if (code == code_next) {
+              AddCode(code_old, code_first);
+              DecodeString(code);
+            } else if (code > code_next) {
+              if (err_msg_ptr) {
+                FXSYS_strncpy(err_msg_ptr, "Decode Error, Out Of Range",
+                              GIF_MAX_ERROR_SIZE - 1);
+              }
+              return 0;
+            } else {
+              DecodeString(code);
+              uint8_t append_char = stack[GIF_MAX_LZW_CODE - stack_size];
+              AddCode(code_old, append_char);
+            }
+          }
+        } else {
+          DecodeString(code);
+        }
+        code_old = code;
+        if (i + stack_size > des_size) {
+          FXSYS_memcpy(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size],
+                       des_size - i);
+          stack_size -= (FX_WORD)(des_size - i);
+          return 3;
+        }
+        FXSYS_memcpy(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size],
+                     stack_size);
+        des_buf += stack_size;
+        i += stack_size;
+        stack_size = 0;
+      }
+    }
+  }
+  if (avail_in == 0) {
+    des_size = i;
+    return 2;
+  }
+  return 0;
+}
+static FX_BOOL gif_grow_buf(uint8_t*& dst_buf,
+                            FX_DWORD& dst_len,
+                            FX_DWORD size) {
+  if (dst_len < size) {
+    FX_DWORD len_org = dst_len;
+    while (dst_buf && dst_len < size) {
+      dst_len <<= 1;
+      dst_buf = FX_Realloc(uint8_t, dst_buf, dst_len);
+    }
+    if (dst_buf == NULL) {
+      dst_len = size;
+      dst_buf = FX_Realloc(uint8_t, dst_buf, dst_len);
+      if (dst_buf == NULL) {
+        return FALSE;
+      }
+    }
+    FXSYS_memset(dst_buf + len_org, 0, dst_len - len_org);
+    return dst_buf != NULL;
+  }
+  return TRUE;
+}
+static inline void gif_cut_index(uint8_t& val,
+                                 FX_DWORD index,
+                                 uint8_t index_bit,
+                                 uint8_t index_bit_use,
+                                 uint8_t bit_use) {
+  FX_DWORD cut = ((1 << (index_bit - index_bit_use)) - 1) << index_bit_use;
+  val |= ((index & cut) >> index_bit_use) << bit_use;
+}
+static inline uint8_t gif_cut_buf(const uint8_t* buf,
+                                  FX_DWORD& offset,
+                                  uint8_t bit_cut,
+                                  uint8_t& bit_offset,
+                                  FX_DWORD& bit_num) {
+  if (bit_cut != 8) {
+    FX_WORD index = 0;
+    index |= ((1 << bit_cut) - 1) << (7 - bit_offset);
+    uint8_t ret = ((index & buf[offset]) >> (7 - bit_offset));
+    bit_offset += bit_cut;
+    if (bit_offset >= 8) {
+      if (bit_offset > 8) {
+        ret |= ((index & (buf[offset + 1] << 8)) >> 8);
+      }
+      bit_offset -= 8;
+      offset++;
+    }
+    bit_num += bit_cut;
+    return ret;
+  }
+  bit_num += bit_cut;
+  return buf[offset++];
+}
+CGifLZWEncoder::CGifLZWEncoder() {
+  FXSYS_memset(this, 0, sizeof(CGifLZWEncoder));
+}
+CGifLZWEncoder::~CGifLZWEncoder() {}
+void CGifLZWEncoder::ClearTable() {
+  index_bit_cur = code_size + 1;
+  index_num = code_end + 1;
+  table_cur = code_end + 1;
+  for (FX_WORD i = 0; i < GIF_MAX_LZW_CODE; i++) {
+    code_table[i].prefix = 0;
+    code_table[i].suffix = 0;
+  }
+}
+void CGifLZWEncoder::Start(uint8_t code_len,
+                           const uint8_t* src_buf,
+                           uint8_t*& dst_buf,
+                           FX_DWORD& offset) {
+  code_size = code_len + 1;
+  src_bit_cut = code_size;
+  if (code_len == 0) {
+    src_bit_cut = 1;
+    code_size = 2;
+  }
+  code_clear = 1 << code_size;
+  code_end = code_clear + 1;
+  dst_buf[offset++] = code_size;
+  bit_offset = 0;
+  ClearTable();
+  src_offset = 0;
+  src_bit_offset = 0;
+  src_bit_num = 0;
+  code_table[index_num].prefix = gif_cut_buf(src_buf, src_offset, src_bit_cut,
+                                             src_bit_offset, src_bit_num);
+  code_table[index_num].suffix = gif_cut_buf(src_buf, src_offset, src_bit_cut,
+                                             src_bit_offset, src_bit_num);
+}
+void CGifLZWEncoder::WriteBlock(uint8_t*& dst_buf,
+                                FX_DWORD& dst_len,
+                                FX_DWORD& offset) {
+  if (!gif_grow_buf(dst_buf, dst_len, offset + GIF_DATA_BLOCK + 1)) {
+    longjmp(jmp, 1);
+  }
+  dst_buf[offset++] = index_buf_len;
+  FXSYS_memcpy(&dst_buf[offset], index_buf, index_buf_len);
+  offset += index_buf_len;
+  FXSYS_memset(index_buf, 0, GIF_DATA_BLOCK);
+  index_buf_len = 0;
+}
+void CGifLZWEncoder::EncodeString(FX_DWORD index,
+                                  uint8_t*& dst_buf,
+                                  FX_DWORD& dst_len,
+                                  FX_DWORD& offset) {
+  uint8_t index_bit_use;
+  index_bit_use = 0;
+  if (index_buf_len == GIF_DATA_BLOCK) {
+    WriteBlock(dst_buf, dst_len, offset);
+  }
+  gif_cut_index(index_buf[index_buf_len], index, index_bit_cur, index_bit_use,
+                bit_offset);
+  if (index_bit_cur <= (8 - bit_offset)) {
+    bit_offset += index_bit_cur;
+  } else if (index_bit_cur <= (16 - bit_offset)) {
+    index_bit_use += (8 - bit_offset);
+    bit_offset = 0;
+    index_buf_len++;
+    if (index_buf_len == GIF_DATA_BLOCK) {
+      WriteBlock(dst_buf, dst_len, offset);
+    }
+    gif_cut_index(index_buf[index_buf_len], index, index_bit_cur, index_bit_use,
+                  bit_offset);
+    bit_offset = index_bit_cur - index_bit_use;
+  } else {
+    index_bit_use += (8 - bit_offset);
+    bit_offset = 0;
+    index_buf_len++;
+    if (index_buf_len == GIF_DATA_BLOCK) {
+      WriteBlock(dst_buf, dst_len, offset);
+    }
+    gif_cut_index(index_buf[index_buf_len], index, index_bit_cur, index_bit_use,
+                  bit_offset);
+    index_bit_use += 8;
+    bit_offset = 0;
+    index_buf_len++;
+    if (index_buf_len == GIF_DATA_BLOCK) {
+      WriteBlock(dst_buf, dst_len, offset);
+    }
+    gif_cut_index(index_buf[index_buf_len], index, index_bit_cur, index_bit_use,
+                  bit_offset);
+    bit_offset = index_bit_cur - index_bit_use;
+  }
+  if (bit_offset == 8) {
+    bit_offset = 0;
+    index_buf_len++;
+    if (index_buf_len == GIF_DATA_BLOCK) {
+      WriteBlock(dst_buf, dst_len, offset);
+    }
+  }
+  if (index == code_end) {
+    index_buf_len++;
+    WriteBlock(dst_buf, dst_len, offset);
+  }
+  if (index_num++ >> index_bit_cur) {
+    index_bit_cur++;
+  }
+}
+FX_BOOL CGifLZWEncoder::Encode(const uint8_t* src_buf,
+                               FX_DWORD src_len,
+                               uint8_t*& dst_buf,
+                               FX_DWORD& dst_len,
+                               FX_DWORD& offset) {
+  uint8_t suffix;
+  if (setjmp(jmp)) {
+    return FALSE;
+  }
+  while (src_bit_num < src_len) {
+    if (!LookUpInTable(src_buf, src_offset, src_bit_offset)) {
+      EncodeString(code_table[index_num].prefix, dst_buf, dst_len, offset);
+      if (index_num == GIF_MAX_LZW_CODE) {
+        suffix = code_table[index_num - 1].suffix;
+        EncodeString(code_clear, dst_buf, dst_len, offset);
+        ClearTable();
+        code_table[index_num].prefix = suffix;
+        code_table[index_num].suffix = gif_cut_buf(
+            src_buf, src_offset, src_bit_cut, src_bit_offset, src_bit_num);
+      } else {
+        code_table[index_num].prefix = code_table[index_num - 1].suffix;
+        code_table[index_num].suffix = gif_cut_buf(
+            src_buf, src_offset, src_bit_cut, src_bit_offset, src_bit_num);
+      }
+    }
+  }
+  src_offset = 0;
+  src_bit_offset = 0;
+  src_bit_num = 0;
+  return TRUE;
+}
+FX_BOOL CGifLZWEncoder::LookUpInTable(const uint8_t* buf,
+                                      FX_DWORD& offset,
+                                      uint8_t& bit_offset) {
+  for (FX_WORD i = table_cur; i < index_num; i++) {
+    if (code_table[i].prefix == code_table[index_num].prefix &&
+        code_table[i].suffix == code_table[index_num].suffix) {
+      code_table[index_num].prefix = i;
+      code_table[index_num].suffix =
+          gif_cut_buf(buf, offset, src_bit_cut, bit_offset, src_bit_num);
+      table_cur = i;
+      return TRUE;
+    }
+  }
+  table_cur = code_end + 1;
+  return FALSE;
+}
+void CGifLZWEncoder::Finish(uint8_t*& dst_buf,
+                            FX_DWORD& dst_len,
+                            FX_DWORD& offset) {
+  EncodeString(code_table[index_num].prefix, dst_buf, dst_len, offset);
+  EncodeString(code_end, dst_buf, dst_len, offset);
+  bit_offset = 0;
+  ClearTable();
+}
+gif_decompress_struct_p gif_create_decompress() {
+  gif_decompress_struct_p gif_ptr =
+      (gif_decompress_struct*)FX_Alloc(uint8_t, sizeof(gif_decompress_struct));
+  if (gif_ptr == NULL) {
+    return NULL;
+  }
+  FXSYS_memset(gif_ptr, 0, sizeof(gif_decompress_struct));
+  gif_ptr->decode_status = GIF_D_STATUS_SIG;
+  gif_ptr->img_ptr_arr_ptr = new CFX_ArrayTemplate<GifImage*>;
+  gif_ptr->cmt_data_ptr = new CFX_ByteString;
+  gif_ptr->pt_ptr_arr_ptr = new CFX_ArrayTemplate<GifPlainText*>;
+  return gif_ptr;
+}
+void gif_destroy_decompress(gif_decompress_struct_pp gif_ptr_ptr) {
+  if (gif_ptr_ptr == NULL || *gif_ptr_ptr == NULL) {
+    return;
+  }
+  gif_decompress_struct_p gif_ptr = *gif_ptr_ptr;
+  *gif_ptr_ptr = NULL;
+  FX_Free(gif_ptr->global_pal_ptr);
+  delete gif_ptr->img_decoder_ptr;
+  if (gif_ptr->img_ptr_arr_ptr) {
+    int32_t size_img_arr = gif_ptr->img_ptr_arr_ptr->GetSize();
+    for (int32_t i = 0; i < size_img_arr; i++) {
+      GifImage* p = gif_ptr->img_ptr_arr_ptr->GetAt(i);
+      FX_Free(p->image_info_ptr);
+      FX_Free(p->image_gce_ptr);
+      FX_Free(p->image_row_buf);
+      if (p->local_pal_ptr && p->local_pal_ptr != gif_ptr->global_pal_ptr) {
+        FX_Free(p->local_pal_ptr);
+      }
+      FX_Free(p);
+    }
+    gif_ptr->img_ptr_arr_ptr->RemoveAll();
+    delete gif_ptr->img_ptr_arr_ptr;
+  }
+  delete gif_ptr->cmt_data_ptr;
+  FX_Free(gif_ptr->gce_ptr);
+  if (gif_ptr->pt_ptr_arr_ptr) {
+    int32_t size_pt_arr = gif_ptr->pt_ptr_arr_ptr->GetSize();
+    for (int32_t i = 0; i < size_pt_arr; i++) {
+      GifPlainText* p = gif_ptr->pt_ptr_arr_ptr->GetAt(i);
+      FX_Free(p->gce_ptr);
+      FX_Free(p->pte_ptr);
+      delete p->string_ptr;
+    }
+    gif_ptr->pt_ptr_arr_ptr->RemoveAll();
+    delete gif_ptr->pt_ptr_arr_ptr;
+  }
+  FX_Free(gif_ptr);
+}
+gif_compress_struct_p gif_create_compress() {
+  gif_compress_struct_p gif_ptr =
+      (gif_compress_struct*)FX_Alloc(uint8_t, sizeof(gif_compress_struct));
+  if (gif_ptr == NULL) {
+    return NULL;
+  }
+  FXSYS_memset(gif_ptr, 0, sizeof(gif_compress_struct));
+  gif_ptr->img_encoder_ptr = new CGifLZWEncoder;
+  gif_ptr->header_ptr = (GifHeader*)FX_Alloc(uint8_t, sizeof(GifHeader));
+  if (gif_ptr->header_ptr == NULL) {
+    delete (gif_ptr->img_encoder_ptr);
+    FX_Free(gif_ptr);
+    return NULL;
+  }
+  FXSYS_memcpy(gif_ptr->header_ptr->signature, GIF_SIGNATURE, 3);
+  FXSYS_memcpy(gif_ptr->header_ptr->version, "89a", 3);
+  gif_ptr->lsd_ptr = (GifLSD*)FX_Alloc(uint8_t, sizeof(GifLSD));
+  if (gif_ptr->lsd_ptr == NULL) {
+    FX_Free(gif_ptr->header_ptr);
+    delete (gif_ptr->img_encoder_ptr);
+    FX_Free(gif_ptr);
+    return NULL;
+  }
+  FXSYS_memset(gif_ptr->lsd_ptr, 0, sizeof(GifLSD));
+  gif_ptr->image_info_ptr =
+      (GifImageInfo*)FX_Alloc(uint8_t, sizeof(GifImageInfo));
+  if (gif_ptr->image_info_ptr == NULL) {
+    FX_Free(gif_ptr->lsd_ptr);
+    FX_Free(gif_ptr->header_ptr);
+    delete (gif_ptr->img_encoder_ptr);
+    FX_Free(gif_ptr);
+    return NULL;
+  }
+  FXSYS_memset(gif_ptr->image_info_ptr, 0, sizeof(GifImageInfo));
+  gif_ptr->gce_ptr = (GifGCE*)FX_Alloc(uint8_t, sizeof(GifGCE));
+  if (gif_ptr->gce_ptr == NULL) {
+    FX_Free(gif_ptr->image_info_ptr);
+    FX_Free(gif_ptr->lsd_ptr);
+    FX_Free(gif_ptr->header_ptr);
+    delete (gif_ptr->img_encoder_ptr);
+    FX_Free(gif_ptr);
+    return NULL;
+  }
+  gif_ptr->pte_ptr = (GifPTE*)FX_Alloc(uint8_t, sizeof(GifPTE));
+  if (gif_ptr->pte_ptr == NULL) {
+    FX_Free(gif_ptr->gce_ptr);
+    FX_Free(gif_ptr->image_info_ptr);
+    FX_Free(gif_ptr->lsd_ptr);
+    FX_Free(gif_ptr->header_ptr);
+    delete (gif_ptr->img_encoder_ptr);
+    FX_Free(gif_ptr);
+    return NULL;
+  }
+  FXSYS_memset(gif_ptr->pte_ptr, 0, sizeof(GifPTE));
+  gif_ptr->pte_ptr->block_size = 12;
+  return gif_ptr;
+}
+void gif_destroy_compress(gif_compress_struct_pp gif_ptr_ptr) {
+  if (gif_ptr_ptr == NULL || *gif_ptr_ptr == NULL) {
+    return;
+  }
+  gif_compress_struct_p gif_ptr = *gif_ptr_ptr;
+  *gif_ptr_ptr = NULL;
+  FX_Free(gif_ptr->header_ptr);
+  FX_Free(gif_ptr->lsd_ptr);
+  FX_Free(gif_ptr->global_pal);
+  FX_Free(gif_ptr->image_info_ptr);
+  FX_Free(gif_ptr->local_pal);
+  delete gif_ptr->img_encoder_ptr;
+  FX_Free(gif_ptr->gce_ptr);
+  FX_Free(gif_ptr->cmt_data_ptr);
+  FX_Free(gif_ptr->pte_ptr);
+  FX_Free(gif_ptr);
+}
+void gif_error(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg) {
+  if (gif_ptr && gif_ptr->gif_error_fn) {
+    gif_ptr->gif_error_fn(gif_ptr, err_msg);
+  }
+}
+void gif_warn(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg) {}
+int32_t gif_read_header(gif_decompress_struct_p gif_ptr) {
+  if (gif_ptr == NULL) {
+    return 0;
+  }
+  FX_DWORD skip_size_org = gif_ptr->skip_size;
+  ASSERT(sizeof(GifHeader) == 6);
+  GifHeader* gif_header_ptr = NULL;
+  if (gif_read_data(gif_ptr, (uint8_t**)&gif_header_ptr, 6) == NULL) {
+    return 2;
+  }
+  if (FXSYS_strncmp(gif_header_ptr->signature, GIF_SIGNATURE, 3) != 0 ||
+      gif_header_ptr->version[0] != '8' || gif_header_ptr->version[2] != 'a') {
+    gif_error(gif_ptr, "Not A Gif Image");
+    return 0;
+  }
+  ASSERT(sizeof(GifLSD) == 7);
+  GifLSD* gif_lsd_ptr = NULL;
+  if (gif_read_data(gif_ptr, (uint8_t**)&gif_lsd_ptr, 7) == NULL) {
+    gif_ptr->skip_size = skip_size_org;
+    return 2;
+  }
+  if (((GifGF*)&gif_lsd_ptr->global_flag)->global_pal) {
+    gif_ptr->global_pal_num = 2
+                              << ((GifGF*)&gif_lsd_ptr->global_flag)->pal_bits;
+    ASSERT(sizeof(GifPalette) == 3);
+    int32_t global_pal_size = gif_ptr->global_pal_num * 3;
+    uint8_t* global_pal_ptr = NULL;
+    if (gif_read_data(gif_ptr, &global_pal_ptr, global_pal_size) == NULL) {
+      gif_ptr->skip_size = skip_size_org;
+      return 2;
+    }
+    gif_ptr->global_sort_flag = ((GifGF*)&gif_lsd_ptr->global_flag)->sort_flag;
+    gif_ptr->global_color_resolution =
+        ((GifGF*)&gif_lsd_ptr->global_flag)->color_resolution;
+    FX_Free(gif_ptr->global_pal_ptr);
+    gif_ptr->global_pal_ptr = (GifPalette*)FX_Alloc(uint8_t, global_pal_size);
+    FXSYS_memcpy(gif_ptr->global_pal_ptr, global_pal_ptr, global_pal_size);
+  }
+  gif_ptr->width = (int)GetWord_LSBFirst((uint8_t*)&gif_lsd_ptr->width);
+  gif_ptr->height = (int)GetWord_LSBFirst((uint8_t*)&gif_lsd_ptr->height);
+  gif_ptr->bc_index = gif_lsd_ptr->bc_index;
+  gif_ptr->pixel_aspect = gif_lsd_ptr->pixel_aspect;
+  return 1;
+}
+int32_t gif_get_frame(gif_decompress_struct_p gif_ptr) {
+  if (gif_ptr == NULL) {
+    return 0;
+  }
+  int32_t ret = 1;
+  while (TRUE) {
+    switch (gif_ptr->decode_status) {
+      case GIF_D_STATUS_TAIL:
+        return 1;
+      case GIF_D_STATUS_SIG: {
+        uint8_t* sig_ptr = NULL;
+        if (gif_read_data(gif_ptr, &sig_ptr, 1) == NULL) {
+          return 2;
+        }
+        switch (*sig_ptr) {
+          case GIF_SIG_EXTENSION:
+            gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT);
+            continue;
+          case GIF_SIG_IMAGE:
+            gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_INFO);
+            continue;
+          case GIF_SIG_TRAILER:
+            gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL);
+            return 1;
+          default:
+            if (gif_ptr->avail_in) {
+              gif_warn(gif_ptr, "The Gif File has non_standard Tag!");
+              gif_save_decoding_status(gif_ptr, GIF_D_STATUS_SIG);
+              continue;
+            }
+            gif_warn(gif_ptr, "The Gif File Doesn't have Trailer Tag!");
+            return 1;
+        }
+      }
+      case GIF_D_STATUS_EXT: {
+        uint8_t* ext_ptr = NULL;
+        if (gif_read_data(gif_ptr, &ext_ptr, 1) == NULL) {
+          return 2;
+        }
+        switch (*ext_ptr) {
+          case GIF_BLOCK_CE:
+            gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_CE);
+            continue;
+          case GIF_BLOCK_GCE:
+            gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_GCE);
+            continue;
+          case GIF_BLOCK_PTE:
+            gif_save_decoding_status(gif_ptr, 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(gif_ptr, status);
+            continue;
+          }
+        }
+      }
+      case GIF_D_STATUS_IMG_INFO: {
+        ret = gif_decode_image_info(gif_ptr);
+        if (ret != 1) {
+          return ret;
+        }
+        continue;
+      }
+      case GIF_D_STATUS_IMG_DATA: {
+        uint8_t* data_size_ptr = NULL;
+        uint8_t* data_ptr = NULL;
+        FX_DWORD skip_size_org = gif_ptr->skip_size;
+        if (gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+          return 2;
+        }
+        while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
+          if (gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) == NULL) {
+            gif_ptr->skip_size = skip_size_org;
+            return 2;
+          }
+          gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA);
+          skip_size_org = gif_ptr->skip_size;
+          if (gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+            return 2;
+          }
+        }
+        gif_save_decoding_status(gif_ptr, GIF_D_STATUS_SIG);
+        continue;
+      }
+      default: {
+        ret = gif_decode_extension(gif_ptr);
+        if (ret != 1) {
+          return ret;
+        }
+        continue;
+      }
+    }
+  }
+  return 1;
+}
+void gif_takeover_gce_ptr(gif_decompress_struct_p gif_ptr,
+                          GifGCE** gce_ptr_ptr) {
+  *gce_ptr_ptr = NULL;
+  if (gif_ptr->gce_ptr && gce_ptr_ptr) {
+    *gce_ptr_ptr = gif_ptr->gce_ptr;
+    gif_ptr->gce_ptr = NULL;
+  }
+}
+int32_t gif_decode_extension(gif_decompress_struct_p gif_ptr) {
+  uint8_t* data_size_ptr = NULL;
+  uint8_t* data_ptr = NULL;
+  FX_DWORD skip_size_org = gif_ptr->skip_size;
+  switch (gif_ptr->decode_status) {
+    case GIF_D_STATUS_EXT_CE: {
+      if (gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+        gif_ptr->skip_size = skip_size_org;
+        return 2;
+      }
+      gif_ptr->cmt_data_ptr->Empty();
+      while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
+        uint8_t data_size = *data_size_ptr;
+        if (gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) == NULL ||
+            gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+          gif_ptr->skip_size = skip_size_org;
+          return 2;
+        }
+        *(gif_ptr->cmt_data_ptr) +=
+            CFX_ByteString((const FX_CHAR*)data_ptr, data_size);
+      }
+    } break;
+    case GIF_D_STATUS_EXT_PTE: {
+      ASSERT(sizeof(GifPTE) == 13);
+      GifPTE* gif_pte_ptr = NULL;
+      if (gif_read_data(gif_ptr, (uint8_t**)&gif_pte_ptr, 13) == NULL) {
+        return 2;
+      }
+      GifPlainText* gif_pt_ptr = FX_Alloc(GifPlainText, 1);
+      FXSYS_memset(gif_pt_ptr, 0, sizeof(GifPlainText));
+      gif_takeover_gce_ptr(gif_ptr, &gif_pt_ptr->gce_ptr);
+      gif_pt_ptr->pte_ptr = (GifPTE*)FX_Alloc(uint8_t, sizeof(GifPTE));
+      gif_pt_ptr->string_ptr = new CFX_ByteString;
+      gif_pt_ptr->pte_ptr->block_size = gif_pte_ptr->block_size;
+      gif_pt_ptr->pte_ptr->grid_left =
+          GetWord_LSBFirst((uint8_t*)&gif_pte_ptr->grid_left);
+      gif_pt_ptr->pte_ptr->grid_top =
+          GetWord_LSBFirst((uint8_t*)&gif_pte_ptr->grid_top);
+      gif_pt_ptr->pte_ptr->grid_width =
+          GetWord_LSBFirst((uint8_t*)&gif_pte_ptr->grid_width);
+      gif_pt_ptr->pte_ptr->grid_height =
+          GetWord_LSBFirst((uint8_t*)&gif_pte_ptr->grid_height);
+      gif_pt_ptr->pte_ptr->char_width = gif_pte_ptr->char_width;
+      gif_pt_ptr->pte_ptr->char_height = gif_pte_ptr->char_height;
+      gif_pt_ptr->pte_ptr->fc_index = gif_pte_ptr->fc_index;
+      gif_pt_ptr->pte_ptr->bc_index = gif_pte_ptr->bc_index;
+      if (gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+        gif_ptr->skip_size = skip_size_org;
+        if (gif_pt_ptr) {
+          FX_Free(gif_pt_ptr->gce_ptr);
+          FX_Free(gif_pt_ptr->pte_ptr);
+          delete gif_pt_ptr->string_ptr;
+          FX_Free(gif_pt_ptr);
+        }
+        return 2;
+      }
+      while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
+        uint8_t data_size = *data_size_ptr;
+        if (gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) == NULL ||
+            gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+          gif_ptr->skip_size = skip_size_org;
+          if (gif_pt_ptr) {
+            FX_Free(gif_pt_ptr->gce_ptr);
+            FX_Free(gif_pt_ptr->pte_ptr);
+            delete gif_pt_ptr->string_ptr;
+            FX_Free(gif_pt_ptr);
+          }
+          return 2;
+        }
+        *(gif_pt_ptr->string_ptr) +=
+            CFX_ByteString((const FX_CHAR*)data_ptr, data_size);
+      }
+      gif_ptr->pt_ptr_arr_ptr->Add(gif_pt_ptr);
+    } break;
+    case GIF_D_STATUS_EXT_GCE: {
+      ASSERT(sizeof(GifGCE) == 5);
+      GifGCE* gif_gce_ptr = NULL;
+      if (gif_read_data(gif_ptr, (uint8_t**)&gif_gce_ptr, 6) == NULL) {
+        return 2;
+      }
+      if (gif_ptr->gce_ptr == NULL) {
+        gif_ptr->gce_ptr = (GifGCE*)FX_Alloc(uint8_t, sizeof(GifGCE));
+      }
+      gif_ptr->gce_ptr->block_size = gif_gce_ptr->block_size;
+      gif_ptr->gce_ptr->gce_flag = gif_gce_ptr->gce_flag;
+      gif_ptr->gce_ptr->delay_time =
+          GetWord_LSBFirst((uint8_t*)&gif_gce_ptr->delay_time);
+      gif_ptr->gce_ptr->trans_index = gif_gce_ptr->trans_index;
+    } break;
+    default: {
+      if (gif_ptr->decode_status == GIF_D_STATUS_EXT_PTE) {
+        FX_Free(gif_ptr->gce_ptr);
+        gif_ptr->gce_ptr = NULL;
+      }
+      if (gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+        return 2;
+      }
+      while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
+        if (gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) == NULL ||
+            gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+          gif_ptr->skip_size = skip_size_org;
+          return 2;
+        }
+      }
+    }
+  }
+  gif_save_decoding_status(gif_ptr, GIF_D_STATUS_SIG);
+  return 1;
+}
+int32_t gif_decode_image_info(gif_decompress_struct_p gif_ptr) {
+  if (gif_ptr->width == 0 || gif_ptr->height == 0) {
+    gif_error(gif_ptr, "No Image Header Info");
+    return 0;
+  }
+  FX_DWORD skip_size_org = gif_ptr->skip_size;
+  ASSERT(sizeof(GifImageInfo) == 9);
+  GifImageInfo* gif_img_info_ptr = NULL;
+  if (gif_read_data(gif_ptr, (uint8_t**)&gif_img_info_ptr, 9) == NULL) {
+    return 2;
+  }
+  GifImage* gif_image_ptr = (GifImage*)FX_Alloc(uint8_t, sizeof(GifImage));
+  FXSYS_memset(gif_image_ptr, 0, sizeof(GifImage));
+  gif_image_ptr->image_info_ptr =
+      (GifImageInfo*)FX_Alloc(uint8_t, sizeof(GifImageInfo));
+  gif_image_ptr->image_info_ptr->left =
+      GetWord_LSBFirst((uint8_t*)&gif_img_info_ptr->left);
+  gif_image_ptr->image_info_ptr->top =
+      GetWord_LSBFirst((uint8_t*)&gif_img_info_ptr->top);
+  gif_image_ptr->image_info_ptr->width =
+      GetWord_LSBFirst((uint8_t*)&gif_img_info_ptr->width);
+  gif_image_ptr->image_info_ptr->height =
+      GetWord_LSBFirst((uint8_t*)&gif_img_info_ptr->height);
+  gif_image_ptr->image_info_ptr->local_flag = gif_img_info_ptr->local_flag;
+  if (gif_image_ptr->image_info_ptr->left +
+              gif_image_ptr->image_info_ptr->width >
+          gif_ptr->width ||
+      gif_image_ptr->image_info_ptr->top +
+              gif_image_ptr->image_info_ptr->height >
+          gif_ptr->height) {
+    FX_Free(gif_image_ptr->image_info_ptr);
+    FX_Free(gif_image_ptr->image_row_buf);
+    FX_Free(gif_image_ptr);
+    gif_error(gif_ptr, "Image Data Out Of LSD, The File May Be Corrupt");
+    return 0;
+  }
+  GifLF* gif_img_info_lf_ptr = (GifLF*)&gif_img_info_ptr->local_flag;
+  if (gif_img_info_lf_ptr->local_pal) {
+    ASSERT(sizeof(GifPalette) == 3);
+    int32_t loc_pal_size = (2 << gif_img_info_lf_ptr->pal_bits) * 3;
+    uint8_t* loc_pal_ptr = NULL;
+    if (gif_read_data(gif_ptr, &loc_pal_ptr, loc_pal_size) == NULL) {
+      gif_ptr->skip_size = skip_size_org;
+      FX_Free(gif_image_ptr->image_info_ptr);
+      FX_Free(gif_image_ptr->image_row_buf);
+      FX_Free(gif_image_ptr);
+      return 2;
+    }
+    gif_image_ptr->local_pal_ptr =
+        (GifPalette*)gif_ptr->gif_ask_buf_for_pal_fn(gif_ptr, loc_pal_size);
+    if (gif_image_ptr->local_pal_ptr) {
+      FXSYS_memcpy((uint8_t*)gif_image_ptr->local_pal_ptr, loc_pal_ptr,
+                   loc_pal_size);
+    }
+  }
+  uint8_t* code_size_ptr = NULL;
+  if (gif_read_data(gif_ptr, &code_size_ptr, 1) == NULL) {
+    gif_ptr->skip_size = skip_size_org;
+    FX_Free(gif_image_ptr->image_info_ptr);
+    FX_Free(gif_image_ptr->local_pal_ptr);
+    FX_Free(gif_image_ptr->image_row_buf);
+    FX_Free(gif_image_ptr);
+    return 2;
+  }
+  gif_image_ptr->image_code_size = *code_size_ptr;
+  gif_ptr->gif_record_current_position_fn(gif_ptr,
+                                          &gif_image_ptr->image_data_pos);
+  gif_image_ptr->image_data_pos += gif_ptr->skip_size;
+  gif_takeover_gce_ptr(gif_ptr, &gif_image_ptr->image_gce_ptr);
+  gif_ptr->img_ptr_arr_ptr->Add(gif_image_ptr);
+  gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA);
+  return 1;
+}
+int32_t gif_load_frame(gif_decompress_struct_p gif_ptr, int32_t frame_num) {
+  if (gif_ptr == NULL || frame_num < 0 ||
+      frame_num >= gif_ptr->img_ptr_arr_ptr->GetSize()) {
+    return 0;
+  }
+  uint8_t* data_size_ptr = NULL;
+  uint8_t* data_ptr = NULL;
+  FX_DWORD skip_size_org = gif_ptr->skip_size;
+  GifImage* gif_image_ptr = gif_ptr->img_ptr_arr_ptr->GetAt(frame_num);
+  FX_DWORD gif_img_row_bytes = gif_image_ptr->image_info_ptr->width;
+  if (gif_ptr->decode_status == GIF_D_STATUS_TAIL) {
+    if (gif_image_ptr->image_row_buf) {
+      FX_Free(gif_image_ptr->image_row_buf);
+      gif_image_ptr->image_row_buf = NULL;
+    }
+    gif_image_ptr->image_row_buf = FX_Alloc(uint8_t, gif_img_row_bytes);
+    GifGCE* gif_img_gce_ptr = gif_image_ptr->image_gce_ptr;
+    int32_t loc_pal_num =
+        ((GifLF*)&gif_image_ptr->image_info_ptr->local_flag)->local_pal
+            ? (2 << ((GifLF*)&gif_image_ptr->image_info_ptr->local_flag)
+                        ->pal_bits)
+            : 0;
+    gif_ptr->avail_in = 0;
+    if (gif_img_gce_ptr == NULL) {
+      FX_BOOL bRes = gif_ptr->gif_get_record_position_fn(
+          gif_ptr, gif_image_ptr->image_data_pos,
+          gif_image_ptr->image_info_ptr->left,
+          gif_image_ptr->image_info_ptr->top,
+          gif_image_ptr->image_info_ptr->width,
+          gif_image_ptr->image_info_ptr->height, loc_pal_num,
+          gif_image_ptr->local_pal_ptr, 0, 0, -1, 0,
+          (FX_BOOL)((GifLF*)&gif_image_ptr->image_info_ptr->local_flag)
+              ->interlace);
+      if (!bRes) {
+        FX_Free(gif_image_ptr->image_row_buf);
+        gif_image_ptr->image_row_buf = NULL;
+        gif_error(gif_ptr, "Error Read Record Position Data");
+        return 0;
+      }
+    } else {
+      FX_BOOL bRes = gif_ptr->gif_get_record_position_fn(
+          gif_ptr, gif_image_ptr->image_data_pos,
+          gif_image_ptr->image_info_ptr->left,
+          gif_image_ptr->image_info_ptr->top,
+          gif_image_ptr->image_info_ptr->width,
+          gif_image_ptr->image_info_ptr->height, loc_pal_num,
+          gif_image_ptr->local_pal_ptr,
+          (int32_t)gif_image_ptr->image_gce_ptr->delay_time,
+          (FX_BOOL)((GifCEF*)&gif_image_ptr->image_gce_ptr->gce_flag)
+              ->user_input,
+          ((GifCEF*)&gif_image_ptr->image_gce_ptr->gce_flag)->transparency
+              ? (int32_t)gif_image_ptr->image_gce_ptr->trans_index
+              : -1,
+          (int32_t)((GifCEF*)&gif_image_ptr->image_gce_ptr->gce_flag)
+              ->disposal_method,
+          (FX_BOOL)((GifLF*)&gif_image_ptr->image_info_ptr->local_flag)
+              ->interlace);
+      if (!bRes) {
+        FX_Free(gif_image_ptr->image_row_buf);
+        gif_image_ptr->image_row_buf = NULL;
+        gif_error(gif_ptr, "Error Read Record Position Data");
+        return 0;
+      }
+    }
+    if (gif_ptr->img_decoder_ptr == NULL) {
+      gif_ptr->img_decoder_ptr = new CGifLZWDecoder(gif_ptr->err_ptr);
+    }
+    gif_ptr->img_decoder_ptr->InitTable(gif_image_ptr->image_code_size);
+    gif_ptr->img_row_offset = 0;
+    gif_ptr->img_row_avail_size = 0;
+    gif_ptr->img_pass_num = 0;
+    gif_image_ptr->image_row_num = 0;
+    gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA);
+  }
+  CGifLZWDecoder* img_decoder_ptr = gif_ptr->img_decoder_ptr;
+  if (gif_ptr->decode_status == GIF_D_STATUS_IMG_DATA) {
+    if (gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+      return 2;
+    }
+    if (*data_size_ptr != GIF_BLOCK_TERMINAL) {
+      if (gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) == NULL) {
+        gif_ptr->skip_size = skip_size_org;
+        return 2;
+      }
+      img_decoder_ptr->Input(data_ptr, *data_size_ptr);
+      gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA);
+      gif_ptr->img_row_offset += gif_ptr->img_row_avail_size;
+      gif_ptr->img_row_avail_size = gif_img_row_bytes - gif_ptr->img_row_offset;
+      int32_t ret = img_decoder_ptr->Decode(
+          gif_image_ptr->image_row_buf + gif_ptr->img_row_offset,
+          gif_ptr->img_row_avail_size);
+      if (ret == 0) {
+        FX_Free(gif_image_ptr->image_row_buf);
+        gif_image_ptr->image_row_buf = NULL;
+        gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL);
+        gif_error(gif_ptr, "Decode Image Data Error");
+        return 0;
+      }
+      while (ret != 0) {
+        if (ret == 1) {
+          gif_ptr->gif_get_row_fn(gif_ptr, gif_image_ptr->image_row_num,
+                                  gif_image_ptr->image_row_buf);
+          FX_Free(gif_image_ptr->image_row_buf);
+          gif_image_ptr->image_row_buf = NULL;
+          gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL);
+          return 1;
+        }
+        if (ret == 2) {
+          ASSERT(img_decoder_ptr->GetAvailInput() == 0);
+          skip_size_org = gif_ptr->skip_size;
+          if (gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) {
+            return 2;
+          }
+          if (*data_size_ptr != GIF_BLOCK_TERMINAL) {
+            if (gif_read_data(gif_ptr, &data_ptr, *data_size_ptr) == NULL) {
+              gif_ptr->skip_size = skip_size_org;
+              return 2;
+            }
+            img_decoder_ptr->Input(data_ptr, *data_size_ptr);
+            gif_save_decoding_status(gif_ptr, GIF_D_STATUS_IMG_DATA);
+            gif_ptr->img_row_offset += gif_ptr->img_row_avail_size;
+            gif_ptr->img_row_avail_size =
+                gif_img_row_bytes - gif_ptr->img_row_offset;
+            ret = img_decoder_ptr->Decode(
+                gif_image_ptr->image_row_buf + gif_ptr->img_row_offset,
+                gif_ptr->img_row_avail_size);
+          }
+        }
+        if (ret == 3) {
+          if (((GifLF*)&gif_image_ptr->image_info_ptr->local_flag)->interlace) {
+            gif_ptr->gif_get_row_fn(gif_ptr, gif_image_ptr->image_row_num,
+                                    gif_image_ptr->image_row_buf);
+            gif_image_ptr->image_row_num +=
+                s_gif_interlace_step[gif_ptr->img_pass_num];
+            if (gif_image_ptr->image_row_num >=
+                (int32_t)gif_image_ptr->image_info_ptr->height) {
+              gif_ptr->img_pass_num++;
+              gif_image_ptr->image_row_num =
+                  s_gif_interlace_step[gif_ptr->img_pass_num] / 2;
+            }
+          } else {
+            gif_ptr->gif_get_row_fn(gif_ptr, gif_image_ptr->image_row_num++,
+                                    gif_image_ptr->image_row_buf);
+          }
+          gif_ptr->img_row_offset = 0;
+          gif_ptr->img_row_avail_size = gif_img_row_bytes;
+          ret = img_decoder_ptr->Decode(
+              gif_image_ptr->image_row_buf + gif_ptr->img_row_offset,
+              gif_ptr->img_row_avail_size);
+        }
+        if (ret == 0) {
+          FX_Free(gif_image_ptr->image_row_buf);
+          gif_image_ptr->image_row_buf = NULL;
+          gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL);
+          gif_error(gif_ptr, "Decode Image Data Error");
+          return 0;
+        }
+      }
+    }
+    gif_save_decoding_status(gif_ptr, GIF_D_STATUS_TAIL);
+  }
+  gif_error(gif_ptr, "Decode Image Data Error");
+  return 0;
+}
+void gif_save_decoding_status(gif_decompress_struct_p gif_ptr, int32_t status) {
+  gif_ptr->decode_status = status;
+  gif_ptr->next_in += gif_ptr->skip_size;
+  gif_ptr->avail_in -= gif_ptr->skip_size;
+  gif_ptr->skip_size = 0;
+}
+uint8_t* gif_read_data(gif_decompress_struct_p gif_ptr,
+                       uint8_t** des_buf_pp,
+                       FX_DWORD data_size) {
+  if (gif_ptr == NULL || gif_ptr->avail_in < gif_ptr->skip_size + data_size) {
+    return NULL;
+  }
+  *des_buf_pp = gif_ptr->next_in + gif_ptr->skip_size;
+  gif_ptr->skip_size += data_size;
+  return *des_buf_pp;
+}
+void gif_input_buffer(gif_decompress_struct_p gif_ptr,
+                      uint8_t* src_buf,
+                      FX_DWORD src_size) {
+  gif_ptr->next_in = src_buf;
+  gif_ptr->avail_in = src_size;
+  gif_ptr->skip_size = 0;
+}
+FX_DWORD gif_get_avail_input(gif_decompress_struct_p gif_ptr,
+                             uint8_t** avial_buf_ptr) {
+  if (avial_buf_ptr) {
+    *avial_buf_ptr = NULL;
+    if (gif_ptr->avail_in > 0) {
+      *avial_buf_ptr = gif_ptr->next_in;
+    }
+  }
+  return gif_ptr->avail_in;
+}
+int32_t gif_get_frame_num(gif_decompress_struct_p gif_ptr) {
+  return gif_ptr->img_ptr_arr_ptr->GetSize();
+}
+static FX_BOOL gif_write_header(gif_compress_struct_p gif_ptr,
+                                uint8_t*& dst_buf,
+                                FX_DWORD& dst_len) {
+  if (gif_ptr->cur_offset) {
+    return TRUE;
+  }
+  dst_len = sizeof(GifHeader) + sizeof(GifLSD) + sizeof(GifGF);
+  dst_buf = FX_TryAlloc(uint8_t, dst_len);
+  if (dst_buf == NULL) {
+    return FALSE;
+  }
+  FXSYS_memset(dst_buf, 0, dst_len);
+  FXSYS_memcpy(dst_buf, gif_ptr->header_ptr, sizeof(GifHeader));
+  gif_ptr->cur_offset += sizeof(GifHeader);
+  SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->lsd_ptr->width);
+  gif_ptr->cur_offset += 2;
+  SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->lsd_ptr->height);
+  gif_ptr->cur_offset += 2;
+  dst_buf[gif_ptr->cur_offset++] = gif_ptr->lsd_ptr->global_flag;
+  dst_buf[gif_ptr->cur_offset++] = gif_ptr->lsd_ptr->bc_index;
+  dst_buf[gif_ptr->cur_offset++] = gif_ptr->lsd_ptr->pixel_aspect;
+  if (gif_ptr->global_pal) {
+    FX_WORD size = sizeof(GifPalette) * gif_ptr->gpal_num;
+    if (!gif_grow_buf(dst_buf, dst_len, gif_ptr->cur_offset + size)) {
+      return FALSE;
+    }
+    FXSYS_memcpy(&dst_buf[gif_ptr->cur_offset], gif_ptr->global_pal, size);
+    gif_ptr->cur_offset += size;
+  }
+  return TRUE;
+}
+void interlace_buf(const uint8_t* buf, FX_DWORD pitch, FX_DWORD height) {
+  CFX_ArrayTemplate<uint8_t*> pass[4];
+  int i, j;
+  FX_DWORD row;
+  row = 0;
+  uint8_t* temp;
+  while (row < height) {
+    if (row % 8 == 0) {
+      j = 0;
+    } else if (row % 4 == 0) {
+      j = 1;
+    } else if (row % 2 == 0) {
+      j = 2;
+    } else {
+      j = 3;
+    }
+    temp = FX_Alloc(uint8_t, pitch);
+    if (temp == NULL) {
+      return;
+    }
+    FXSYS_memcpy(temp, &buf[pitch * row], pitch);
+    pass[j].Add(temp);
+    row++;
+  }
+  for (i = 0, row = 0; i < 4; i++) {
+    for (j = 0; j < pass[i].GetSize(); j++, row++) {
+      FXSYS_memcpy((uint8_t*)&buf[pitch * row], pass[i].GetAt(j), pitch);
+      FX_Free(pass[i].GetAt(j));
+    }
+  }
+}
+static void gif_write_block_data(const uint8_t* src_buf,
+                                 FX_DWORD src_len,
+                                 uint8_t*& dst_buf,
+                                 FX_DWORD& dst_len,
+                                 FX_DWORD& dst_offset) {
+  FX_DWORD src_offset = 0;
+  while (src_len > GIF_DATA_BLOCK) {
+    dst_buf[dst_offset++] = GIF_DATA_BLOCK;
+    FXSYS_memcpy(&dst_buf[dst_offset], &src_buf[src_offset], GIF_DATA_BLOCK);
+    dst_offset += GIF_DATA_BLOCK;
+    src_offset += GIF_DATA_BLOCK;
+    src_len -= GIF_DATA_BLOCK;
+  }
+  dst_buf[dst_offset++] = (uint8_t)src_len;
+  FXSYS_memcpy(&dst_buf[dst_offset], &src_buf[src_offset], src_len);
+  dst_offset += src_len;
+}
+static FX_BOOL gif_write_data(gif_compress_struct_p gif_ptr,
+                              uint8_t*& dst_buf,
+                              FX_DWORD& dst_len) {
+  if (!gif_grow_buf(dst_buf, dst_len, gif_ptr->cur_offset + GIF_DATA_BLOCK)) {
+    return FALSE;
+  }
+  if (FXSYS_memcmp(gif_ptr->header_ptr->version, "89a", 3) == 0) {
+    dst_buf[gif_ptr->cur_offset++] = GIF_SIG_EXTENSION;
+    dst_buf[gif_ptr->cur_offset++] = GIF_BLOCK_GCE;
+    gif_ptr->gce_ptr->block_size = 4;
+    dst_buf[gif_ptr->cur_offset++] = gif_ptr->gce_ptr->block_size;
+    gif_ptr->gce_ptr->gce_flag = 0;
+    dst_buf[gif_ptr->cur_offset++] = gif_ptr->gce_ptr->gce_flag;
+    gif_ptr->gce_ptr->delay_time = 10;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                     gif_ptr->gce_ptr->delay_time);
+    gif_ptr->cur_offset += 2;
+    gif_ptr->gce_ptr->trans_index = 0;
+    dst_buf[gif_ptr->cur_offset++] = gif_ptr->gce_ptr->trans_index;
+    dst_buf[gif_ptr->cur_offset++] = 0;
+  }
+  dst_buf[gif_ptr->cur_offset++] = GIF_SIG_IMAGE;
+  SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                   gif_ptr->image_info_ptr->left);
+  gif_ptr->cur_offset += 2;
+  SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->image_info_ptr->top);
+  gif_ptr->cur_offset += 2;
+  SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                   gif_ptr->image_info_ptr->width);
+  gif_ptr->cur_offset += 2;
+  SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                   gif_ptr->image_info_ptr->height);
+  gif_ptr->cur_offset += 2;
+  GifLF& lf = (GifLF&)gif_ptr->image_info_ptr->local_flag;
+  dst_buf[gif_ptr->cur_offset++] = gif_ptr->image_info_ptr->local_flag;
+  if (gif_ptr->local_pal) {
+    FX_DWORD pal_size = sizeof(GifPalette) * gif_ptr->lpal_num;
+    if (!gif_grow_buf(dst_buf, dst_len, pal_size + gif_ptr->cur_offset)) {
+      return FALSE;
+    }
+    FXSYS_memcpy(&dst_buf[gif_ptr->cur_offset], gif_ptr->local_pal, pal_size);
+    gif_ptr->cur_offset += pal_size;
+  }
+  if (lf.interlace) {
+    interlace_buf(gif_ptr->src_buf, gif_ptr->src_pitch,
+                  gif_ptr->image_info_ptr->height);
+  }
+  uint8_t code_bit = lf.pal_bits;
+  if (lf.local_pal == 0) {
+    GifGF& gf = (GifGF&)gif_ptr->lsd_ptr->global_flag;
+    code_bit = gf.pal_bits;
+  }
+  gif_ptr->img_encoder_ptr->Start(code_bit, gif_ptr->src_buf, dst_buf,
+                                  gif_ptr->cur_offset);
+  FX_DWORD i;
+  for (i = 0; i < gif_ptr->src_row; i++) {
+    if (!gif_ptr->img_encoder_ptr->Encode(
+            &gif_ptr->src_buf[i * gif_ptr->src_pitch],
+            gif_ptr->src_width * (code_bit + 1), dst_buf, dst_len,
+            gif_ptr->cur_offset)) {
+      return FALSE;
+    }
+  }
+  gif_ptr->img_encoder_ptr->Finish(dst_buf, dst_len, gif_ptr->cur_offset);
+  dst_buf[gif_ptr->cur_offset++] = 0;
+  if (FXSYS_memcmp(gif_ptr->header_ptr->version, "89a", 3) == 0 &&
+      gif_ptr->cmt_data_ptr) {
+    dst_buf[gif_ptr->cur_offset++] = GIF_SIG_EXTENSION;
+    dst_buf[gif_ptr->cur_offset++] = GIF_BLOCK_CE;
+    gif_write_block_data(gif_ptr->cmt_data_ptr, gif_ptr->cmt_data_len, dst_buf,
+                         dst_len, gif_ptr->cur_offset);
+    dst_buf[gif_ptr->cur_offset++] = 0;
+  }
+  if (FXSYS_memcmp(gif_ptr->header_ptr->version, "89a", 3) == 0 &&
+      gif_ptr->pte_data_ptr) {
+    dst_buf[gif_ptr->cur_offset++] = GIF_SIG_EXTENSION;
+    dst_buf[gif_ptr->cur_offset++] = GIF_BLOCK_PTE;
+    dst_buf[gif_ptr->cur_offset++] = gif_ptr->pte_ptr->block_size;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                     gif_ptr->pte_ptr->grid_left);
+    gif_ptr->cur_offset += 2;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->pte_ptr->grid_top);
+    gif_ptr->cur_offset += 2;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                     gif_ptr->pte_ptr->grid_width);
+    gif_ptr->cur_offset += 2;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                     gif_ptr->pte_ptr->grid_height);
+    gif_ptr->cur_offset += 2;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                     gif_ptr->pte_ptr->char_width);
+    gif_ptr->cur_offset += 2;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset,
+                     gif_ptr->pte_ptr->char_height);
+    gif_ptr->cur_offset += 2;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->pte_ptr->fc_index);
+    gif_ptr->cur_offset += 2;
+    SetWord_LSBFirst(dst_buf + gif_ptr->cur_offset, gif_ptr->pte_ptr->bc_index);
+    gif_ptr->cur_offset += 2;
+    gif_write_block_data(gif_ptr->pte_data_ptr, gif_ptr->pte_data_len, dst_buf,
+                         dst_len, gif_ptr->cur_offset);
+    gif_ptr->cur_offset += gif_ptr->pte_data_len;
+    dst_buf[gif_ptr->cur_offset++] = 0;
+  }
+  dst_buf[gif_ptr->cur_offset++] = GIF_SIG_TRAILER;
+  return TRUE;
+}
+FX_BOOL gif_encode(gif_compress_struct_p gif_ptr,
+                   uint8_t*& dst_buf,
+                   FX_DWORD& dst_len) {
+  if (!gif_write_header(gif_ptr, dst_buf, dst_len)) {
+    return FALSE;
+  }
+  FX_DWORD cur_offset = gif_ptr->cur_offset;
+  FX_BOOL res = TRUE;
+  if (gif_ptr->frames) {
+    gif_ptr->cur_offset--;
+  }
+  if (!gif_write_data(gif_ptr, dst_buf, dst_len)) {
+    gif_ptr->cur_offset = cur_offset;
+    res = FALSE;
+  }
+  dst_len = gif_ptr->cur_offset;
+  dst_buf[dst_len - 1] = GIF_SIG_TRAILER;
+  if (res) {
+    gif_ptr->frames++;
+  }
+  return res;
+}
diff --git a/core/fxcodec/lgif/fx_gif.h b/core/fxcodec/lgif/fx_gif.h
new file mode 100644
index 0000000000..c44fb7a7cb
--- /dev/null
+++ b/core/fxcodec/lgif/fx_gif.h
@@ -0,0 +1,296 @@
+// Copyright 2014 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.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXCODEC_LGIF_FX_GIF_H_
+#define CORE_FXCODEC_LGIF_FX_GIF_H_
+
+#include <setjmp.h>
+
+#include "core/include/fxcrt/fx_basic.h"
+
+#define GIF_SIGNATURE "GIF"
+#define GIF_SIG_EXTENSION 0x21
+#define GIF_SIG_IMAGE 0x2C
+#define GIF_SIG_TRAILER 0x3B
+#define GIF_BLOCK_GCE 0xF9
+#define GIF_BLOCK_PTE 0x01
+#define GIF_BLOCK_CE 0xFE
+#define GIF_BLOCK_AE 0xFF
+#define GIF_BLOCK_TERMINAL 0x00
+#define GIF_MAX_LZW_CODE 4096
+#define GIF_DATA_BLOCK 255
+#define GIF_MAX_ERROR_SIZE 256
+#define GIF_D_STATUS_SIG 0x01
+#define GIF_D_STATUS_TAIL 0x02
+#define GIF_D_STATUS_EXT 0x03
+#define GIF_D_STATUS_EXT_AE 0x04
+#define GIF_D_STATUS_EXT_CE 0x05
+#define GIF_D_STATUS_EXT_GCE 0x06
+#define GIF_D_STATUS_EXT_PTE 0x07
+#define GIF_D_STATUS_EXT_UNE 0x08
+#define GIF_D_STATUS_IMG_INFO 0x09
+#define GIF_D_STATUS_IMG_DATA 0x0A
+#pragma pack(1)
+typedef struct tagGifGF {
+  uint8_t pal_bits : 3;
+  uint8_t sort_flag : 1;
+  uint8_t color_resolution : 3;
+  uint8_t global_pal : 1;
+} GifGF;
+typedef struct tagGifLF {
+  uint8_t pal_bits : 3;
+  uint8_t reserved : 2;
+  uint8_t sort_flag : 1;
+  uint8_t interlace : 1;
+  uint8_t local_pal : 1;
+} GifLF;
+typedef struct tagGifHeader {
+  char signature[3];
+  char version[3];
+} GifHeader;
+typedef struct tagGifLSD {
+  FX_WORD width;
+  FX_WORD height;
+  uint8_t global_flag;
+  uint8_t bc_index;
+  uint8_t pixel_aspect;
+} GifLSD;
+typedef struct tagGifImageInfo {
+  FX_WORD left;
+  FX_WORD top;
+  FX_WORD width;
+  FX_WORD height;
+
+  uint8_t local_flag;
+} GifImageInfo;
+typedef struct tagGifCEF {
+  uint8_t transparency : 1;
+  uint8_t user_input : 1;
+  uint8_t disposal_method : 3;
+  uint8_t reserved : 3;
+} GifCEF;
+typedef struct tagGifGCE {
+  uint8_t block_size;
+  uint8_t gce_flag;
+  FX_WORD delay_time;
+  uint8_t trans_index;
+} GifGCE;
+typedef struct tagGifPTE {
+  uint8_t block_size;
+  FX_WORD grid_left;
+  FX_WORD grid_top;
+  FX_WORD grid_width;
+  FX_WORD grid_height;
+
+  uint8_t char_width;
+  uint8_t char_height;
+
+  uint8_t fc_index;
+  uint8_t bc_index;
+} GifPTE;
+typedef struct tagGifAE {
+  uint8_t block_size;
+  uint8_t app_identify[8];
+  uint8_t app_authentication[3];
+} GifAE;
+typedef struct tagGifPalette { uint8_t r, g, b; } GifPalette;
+#pragma pack()
+typedef struct tagGifImage {
+  GifGCE* image_gce_ptr;
+  GifPalette* local_pal_ptr;
+  GifImageInfo* image_info_ptr;
+  uint8_t image_code_size;
+  FX_DWORD image_data_pos;
+  uint8_t* image_row_buf;
+  int32_t image_row_num;
+} GifImage;
+typedef struct tagGifPlainText {
+  GifGCE* gce_ptr;
+  GifPTE* pte_ptr;
+  CFX_ByteString* string_ptr;
+} GifPlainText;
+class CGifLZWDecoder {
+ public:
+  struct tag_Table {
+    FX_WORD prefix;
+    uint8_t suffix;
+  };
+  CGifLZWDecoder(FX_CHAR* error_ptr = NULL) { err_msg_ptr = error_ptr; }
+  void InitTable(uint8_t code_len);
+
+  int32_t Decode(uint8_t* des_buf, FX_DWORD& des_size);
+
+  void Input(uint8_t* src_buf, FX_DWORD src_size);
+  FX_DWORD GetAvailInput();
+
+ private:
+  void ClearTable();
+  void AddCode(FX_WORD prefix_code, uint8_t append_char);
+  void DecodeString(FX_WORD code);
+  uint8_t code_size;
+  uint8_t code_size_cur;
+  FX_WORD code_clear;
+  FX_WORD code_end;
+  FX_WORD code_next;
+  uint8_t code_first;
+  uint8_t stack[GIF_MAX_LZW_CODE];
+  FX_WORD stack_size;
+  tag_Table code_table[GIF_MAX_LZW_CODE];
+  FX_WORD code_old;
+
+  uint8_t* next_in;
+  FX_DWORD avail_in;
+
+  uint8_t bits_left;
+  FX_DWORD code_store;
+
+  FX_CHAR* err_msg_ptr;
+};
+class CGifLZWEncoder {
+ public:
+  struct tag_Table {
+    FX_WORD prefix;
+    uint8_t suffix;
+  };
+  CGifLZWEncoder();
+  ~CGifLZWEncoder();
+  void Start(uint8_t code_len,
+             const uint8_t* src_buf,
+             uint8_t*& dst_buf,
+             FX_DWORD& offset);
+  FX_BOOL Encode(const uint8_t* src_buf,
+                 FX_DWORD src_len,
+                 uint8_t*& dst_buf,
+                 FX_DWORD& dst_len,
+                 FX_DWORD& offset);
+  void Finish(uint8_t*& dst_buf, FX_DWORD& dst_len, FX_DWORD& offset);
+
+ private:
+  void ClearTable();
+  FX_BOOL LookUpInTable(const uint8_t* buf,
+                        FX_DWORD& offset,
+                        uint8_t& bit_offset);
+  void EncodeString(FX_DWORD index,
+                    uint8_t*& dst_buf,
+                    FX_DWORD& dst_len,
+                    FX_DWORD& offset);
+  void WriteBlock(uint8_t*& dst_buf, FX_DWORD& dst_len, FX_DWORD& offset);
+  jmp_buf jmp;
+  FX_DWORD src_offset;
+  uint8_t src_bit_offset;
+  uint8_t src_bit_cut;
+  FX_DWORD src_bit_num;
+  uint8_t code_size;
+  FX_WORD code_clear;
+  FX_WORD code_end;
+  FX_WORD index_num;
+  uint8_t bit_offset;
+  uint8_t index_bit_cur;
+  uint8_t index_buf[GIF_DATA_BLOCK];
+  uint8_t index_buf_len;
+  tag_Table code_table[GIF_MAX_LZW_CODE];
+  FX_WORD table_cur;
+};
+typedef struct tag_gif_decompress_struct gif_decompress_struct;
+typedef gif_decompress_struct* gif_decompress_struct_p;
+typedef gif_decompress_struct_p* gif_decompress_struct_pp;
+static const int32_t s_gif_interlace_step[4] = {8, 8, 4, 2};
+struct tag_gif_decompress_struct {
+  jmp_buf jmpbuf;
+  FX_CHAR* err_ptr;
+  void (*gif_error_fn)(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg);
+  void* context_ptr;
+  int width;
+  int height;
+  GifPalette* global_pal_ptr;
+  int32_t global_pal_num;
+  uint8_t global_sort_flag;
+  uint8_t global_color_resolution;
+
+  uint8_t bc_index;
+  uint8_t pixel_aspect;
+  CGifLZWDecoder* img_decoder_ptr;
+  FX_DWORD img_row_offset;
+  FX_DWORD img_row_avail_size;
+  uint8_t img_pass_num;
+  CFX_ArrayTemplate<GifImage*>* img_ptr_arr_ptr;
+  uint8_t* (*gif_ask_buf_for_pal_fn)(gif_decompress_struct_p gif_ptr,
+                                     int32_t pal_size);
+  uint8_t* next_in;
+  FX_DWORD avail_in;
+  int32_t decode_status;
+  FX_DWORD skip_size;
+  void (*gif_record_current_position_fn)(gif_decompress_struct_p gif_ptr,
+                                         FX_DWORD* cur_pos_ptr);
+  void (*gif_get_row_fn)(gif_decompress_struct_p gif_ptr,
+                         int32_t row_num,
+                         uint8_t* row_buf);
+  FX_BOOL (*gif_get_record_position_fn)(gif_decompress_struct_p gif_ptr,
+            FX_DWORD cur_pos,
+            int32_t left, int32_t top, int32_t width, int32_t height,
+            int32_t pal_num, void* pal_ptr,
+            int32_t delay_time, FX_BOOL user_input,
+            int32_t trans_index, int32_t disposal_method, FX_BOOL interlace);
+  CFX_ByteString* cmt_data_ptr;
+  GifGCE* gce_ptr;
+  CFX_ArrayTemplate<GifPlainText*>* pt_ptr_arr_ptr;
+};
+typedef struct tag_gif_compress_struct gif_compress_struct;
+typedef gif_compress_struct* gif_compress_struct_p;
+typedef gif_compress_struct_p* gif_compress_struct_pp;
+struct tag_gif_compress_struct {
+  const uint8_t* src_buf;
+  FX_DWORD src_pitch;
+  FX_DWORD src_width;
+  FX_DWORD src_row;
+  FX_DWORD cur_offset;
+  FX_DWORD frames;
+  GifHeader* header_ptr;
+  GifLSD* lsd_ptr;
+  GifPalette* global_pal;
+  FX_WORD gpal_num;
+  GifPalette* local_pal;
+  FX_WORD lpal_num;
+  GifImageInfo* image_info_ptr;
+  CGifLZWEncoder* img_encoder_ptr;
+
+  uint8_t* cmt_data_ptr;
+  FX_DWORD cmt_data_len;
+  GifGCE* gce_ptr;
+  GifPTE* pte_ptr;
+  const uint8_t* pte_data_ptr;
+  FX_DWORD pte_data_len;
+};
+
+void gif_error(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg);
+void gif_warn(gif_decompress_struct_p gif_ptr, const FX_CHAR* err_msg);
+gif_decompress_struct_p gif_create_decompress();
+void gif_destroy_decompress(gif_decompress_struct_pp gif_ptr_ptr);
+gif_compress_struct_p gif_create_compress();
+void gif_destroy_compress(gif_compress_struct_pp gif_ptr_ptr);
+int32_t gif_read_header(gif_decompress_struct_p gif_ptr);
+int32_t gif_get_frame(gif_decompress_struct_p gif_ptr);
+int32_t gif_get_frame_num(gif_decompress_struct_p gif_ptr);
+int32_t gif_decode_extension(gif_decompress_struct_p gif_ptr);
+int32_t gif_decode_image_info(gif_decompress_struct_p gif_ptr);
+void gif_takeover_gce_ptr(gif_decompress_struct_p gif_ptr,
+                          GifGCE** gce_ptr_ptr);
+int32_t gif_load_frame(gif_decompress_struct_p gif_ptr, int32_t frame_num);
+uint8_t* gif_read_data(gif_decompress_struct_p gif_ptr,
+                       uint8_t** des_buf_pp,
+                       FX_DWORD data_size);
+void gif_save_decoding_status(gif_decompress_struct_p gif_ptr, int32_t status);
+void gif_input_buffer(gif_decompress_struct_p gif_ptr,
+                      uint8_t* src_buf,
+                      FX_DWORD src_size);
+FX_DWORD gif_get_avail_input(gif_decompress_struct_p gif_ptr,
+                             uint8_t** avial_buf_ptr);
+void interlace_buf(const uint8_t* buf, FX_DWORD width, FX_DWORD height);
+FX_BOOL gif_encode(gif_compress_struct_p gif_ptr,
+                   uint8_t*& dst_buf,
+                   FX_DWORD& dst_len);
+
+#endif  // CORE_FXCODEC_LGIF_FX_GIF_H_