| // Copyright 2017 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_GIF_CFX_LZWDECOMPRESSOR_H_ |
| #define CORE_FXCODEC_GIF_CFX_LZWDECOMPRESSOR_H_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "core/fxcodec/gif/cfx_gif.h" |
| |
| class CFX_LZWDecompressor { |
| public: |
| typedef struct { |
| uint16_t prefix; |
| uint8_t suffix; |
| } CodeEntry; |
| |
| // Returns nullptr on error |
| static std::unique_ptr<CFX_LZWDecompressor> Create(uint8_t color_exp, |
| uint8_t code_exp); |
| ~CFX_LZWDecompressor(); |
| |
| CFX_GifDecodeStatus Decode(uint8_t* src_buf, |
| uint32_t src_size, |
| uint8_t* des_buf, |
| uint32_t* des_size); |
| |
| private: |
| CFX_LZWDecompressor(uint8_t color_exp, uint8_t code_exp); |
| void ClearTable(); |
| void AddCode(uint16_t prefix_code, uint8_t append_char); |
| bool DecodeString(uint16_t code); |
| |
| uint8_t code_size_; |
| uint8_t code_size_cur_; |
| uint16_t code_color_end_; |
| uint16_t code_clear_; |
| uint16_t code_end_; |
| uint16_t code_next_; |
| uint8_t code_first_; |
| uint8_t stack_[GIF_MAX_LZW_CODE]; |
| size_t stack_size_; |
| CodeEntry code_table_[GIF_MAX_LZW_CODE]; |
| uint16_t code_old_; |
| uint8_t* next_in_; |
| uint32_t avail_in_; |
| uint8_t bits_left_; |
| uint32_t code_store_; |
| }; |
| |
| #endif // CORE_FXCODEC_GIF_CFX_LZWDECOMPRESSOR_H_ |