| // 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 "fx_gif.h" | |
| void CGifLZWDecoder::Input(FX_LPBYTE src_buf, FX_DWORD src_size) | |
| { | |
| next_in = src_buf; | |
| avail_in = src_size; | |
| } | |
| FX_DWORD CGifLZWDecoder::GetAvailInput() | |
| { | |
| return avail_in; | |
| } | |
| void CGifLZWDecoder::InitTable(FX_BYTE 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_memset32(code_table, 0, sizeof(tag_Table)*GIF_MAX_LZW_CODE); | |
| FXSYS_memset32(stack, 0, GIF_MAX_LZW_CODE); | |
| for (FX_WORD i = 0; i < code_clear; i++) { | |
| code_table[i].suffix = (FX_BYTE)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++] = (FX_BYTE)code; | |
| code_first = (FX_BYTE)code; | |
| } | |
| void CGifLZWDecoder::AddCode(FX_WORD prefix_code, FX_BYTE 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++; | |
| } | |
| } | |
| } | |
| FX_INT32 CGifLZWDecoder::Decode(FX_LPBYTE 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_memcpy32(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size], des_size); | |
| stack_size -= (FX_WORD)des_size; | |
| return 3; | |
| } | |
| FXSYS_memcpy32(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); | |
| FX_BYTE 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_memcpy32(des_buf, &stack[GIF_MAX_LZW_CODE - stack_size], des_size - i); | |
| stack_size -= (FX_WORD)(des_size - i); | |
| return 3; | |
| } | |
| FXSYS_memcpy32(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(FX_LPBYTE& 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(FX_BYTE, dst_buf, dst_len); | |
| } | |
| if (dst_buf == NULL) { | |
| dst_len = size; | |
| dst_buf = FX_Realloc(FX_BYTE, dst_buf, dst_len); | |
| if (dst_buf == NULL) { | |
| return FALSE; | |
| } | |
| } | |
| FXSYS_memset32(dst_buf + len_org, 0, dst_len - len_org); | |
| return dst_buf != NULL; | |
| } | |
| return TRUE; | |
| } | |
| static inline void _gif_cut_index(FX_BYTE& val, FX_DWORD index, FX_BYTE index_bit, FX_BYTE index_bit_use, FX_BYTE 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 FX_BYTE _gif_cut_buf(FX_LPCBYTE buf, FX_DWORD& offset, FX_BYTE bit_cut, FX_BYTE& bit_offset, FX_DWORD& bit_num) | |
| { | |
| if (bit_cut != 8) { | |
| FX_WORD index = 0; | |
| index |= ((1 << bit_cut) - 1) << (7 - bit_offset); | |
| FX_BYTE 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_memset32(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( FX_BYTE code_len, FX_LPCBYTE src_buf, FX_LPBYTE& 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(FX_LPBYTE& 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_memcpy32(&dst_buf[offset], index_buf, index_buf_len); | |
| offset += index_buf_len; | |
| FXSYS_memset32(index_buf, 0, GIF_DATA_BLOCK); | |
| index_buf_len = 0; | |
| } | |
| void CGifLZWEncoder::EncodeString( FX_DWORD index, FX_LPBYTE& dst_buf, FX_DWORD& dst_len, FX_DWORD& offset ) | |
| { | |
| FX_BYTE 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( FX_LPCBYTE src_buf, FX_DWORD src_len, FX_LPBYTE& dst_buf, FX_DWORD& dst_len, FX_DWORD& offset ) | |
| { | |
| FX_BYTE 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( FX_LPCBYTE buf, FX_DWORD& offset, FX_BYTE& 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(FX_LPBYTE& 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(FX_BYTE, sizeof(gif_decompress_struct)); | |
| if(gif_ptr == NULL) { | |
| return NULL; | |
| } | |
| FXSYS_memset32(gif_ptr, 0, sizeof(gif_decompress_struct)); | |
| gif_ptr->decode_status = GIF_D_STATUS_SIG; | |
| gif_ptr->img_ptr_arr_ptr = FX_NEW CFX_ArrayTemplate<GifImage*>; | |
| if(gif_ptr->img_ptr_arr_ptr == NULL) { | |
| FX_Free(gif_ptr); | |
| return NULL; | |
| } | |
| #ifdef GIF_SUPPORT_COMMENT_EXTENSION | |
| gif_ptr->cmt_data_ptr = FX_NEW CFX_ByteString; | |
| if(gif_ptr->cmt_data_ptr == NULL) { | |
| delete gif_ptr->img_ptr_arr_ptr; | |
| FX_Free(gif_ptr); | |
| return NULL; | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| gif_ptr->pt_ptr_arr_ptr = FX_NEW CFX_ArrayTemplate<GifPlainText*>; | |
| if(gif_ptr->pt_ptr_arr_ptr == NULL) { | |
| delete(gif_ptr->cmt_data_ptr); | |
| delete gif_ptr->img_ptr_arr_ptr; | |
| FX_Free(gif_ptr); | |
| return NULL; | |
| } | |
| #endif | |
| 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; | |
| if(gif_ptr->global_pal_ptr != NULL) { | |
| FX_Free(gif_ptr->global_pal_ptr); | |
| } | |
| if(gif_ptr->img_decoder_ptr != NULL) { | |
| delete gif_ptr->img_decoder_ptr; | |
| } | |
| if(gif_ptr->img_ptr_arr_ptr != NULL) { | |
| FX_INT32 size_img_arr = gif_ptr->img_ptr_arr_ptr->GetSize(); | |
| for (FX_INT32 i = 0; i < size_img_arr; i++) { | |
| GifImage* p = gif_ptr->img_ptr_arr_ptr->GetAt(i); | |
| if(p->image_info_ptr != NULL) { | |
| FX_Free(p->image_info_ptr); | |
| } | |
| if(p->image_gce_ptr != NULL) { | |
| FX_Free(p->image_gce_ptr); | |
| } | |
| if(p->image_row_buf != NULL) { | |
| FX_Free(p->image_row_buf); | |
| } | |
| if(p->local_pal_ptr != NULL && 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; | |
| } | |
| #ifdef GIF_SUPPORT_APPLICATION_EXTENSION | |
| if(gif_ptr->app_data != NULL) { | |
| FX_Free(gif_ptr->app_data); | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_COMMENT_EXTENSION | |
| if(gif_ptr->cmt_data_ptr != NULL) { | |
| delete gif_ptr->cmt_data_ptr; | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION | |
| if(gif_ptr->gce_ptr != NULL) { | |
| FX_Free(gif_ptr->gce_ptr); | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| if(gif_ptr->pt_ptr_arr_ptr != NULL) { | |
| FX_INT32 size_pt_arr = gif_ptr->pt_ptr_arr_ptr->GetSize(); | |
| for (FX_INT32 i = 0; i < size_pt_arr; i++) { | |
| GifPlainText* p = gif_ptr->pt_ptr_arr_ptr->GetAt(i); | |
| if(p->gce_ptr != NULL) { | |
| FX_Free(p->gce_ptr); | |
| } | |
| if(p->pte_ptr != NULL) { | |
| FX_Free(p->pte_ptr); | |
| } | |
| if(p->string_ptr != NULL) { | |
| delete p->string_ptr; | |
| } | |
| } | |
| gif_ptr->pt_ptr_arr_ptr->RemoveAll(); | |
| delete gif_ptr->pt_ptr_arr_ptr; | |
| } | |
| #endif | |
| FX_Free(gif_ptr); | |
| } | |
| gif_compress_struct_p _gif_create_compress() | |
| { | |
| gif_compress_struct_p gif_ptr = (gif_compress_struct*)FX_Alloc(FX_BYTE, sizeof(gif_compress_struct)); | |
| if (gif_ptr == NULL) { | |
| return NULL; | |
| } | |
| FXSYS_memset32(gif_ptr, 0, sizeof(gif_compress_struct)); | |
| gif_ptr->img_encoder_ptr = FX_NEW CGifLZWEncoder; | |
| if (gif_ptr->img_encoder_ptr == NULL) { | |
| FX_Free(gif_ptr); | |
| return NULL; | |
| } | |
| gif_ptr->header_ptr = (GifHeader*)FX_Alloc(FX_BYTE, sizeof(GifHeader)); | |
| if (gif_ptr->header_ptr == NULL) { | |
| delete(gif_ptr->img_encoder_ptr); | |
| FX_Free(gif_ptr); | |
| return NULL; | |
| } | |
| FXSYS_memcpy32(gif_ptr->header_ptr->signature, GIF_SIGNATURE, 3); | |
| FXSYS_memcpy32(gif_ptr->header_ptr->version, "89a", 3); | |
| gif_ptr->lsd_ptr = (GifLSD*)FX_Alloc(FX_BYTE, 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_memset32(gif_ptr->lsd_ptr, 0, sizeof(GifLSD)); | |
| gif_ptr->image_info_ptr = (GifImageInfo*)FX_Alloc(FX_BYTE, 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_memset32(gif_ptr->image_info_ptr, 0, sizeof(GifImageInfo)); | |
| #ifdef GIF_SUPPORT_APPLICATION_EXTENSION | |
| FXSYS_memcpy32(gif_ptr->app_identify, "netscape", 8); | |
| FXSYS_memcpy32(gif_ptr->app_authentication, "2.0", 3); | |
| #endif | |
| #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION | |
| gif_ptr->gce_ptr = (GifGCE*)FX_Alloc(FX_BYTE, 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; | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| gif_ptr->pte_ptr = (GifPTE*)FX_Alloc(FX_BYTE, 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_memset32(gif_ptr->pte_ptr, 0, sizeof(GifPTE)); | |
| gif_ptr->pte_ptr->block_size = 12; | |
| #endif | |
| 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; | |
| if(gif_ptr->header_ptr != NULL) { | |
| FX_Free(gif_ptr->header_ptr); | |
| } | |
| if(gif_ptr->lsd_ptr != NULL) { | |
| FX_Free(gif_ptr->lsd_ptr); | |
| } | |
| if(gif_ptr->global_pal != NULL) { | |
| FX_Free(gif_ptr->global_pal); | |
| } | |
| if(gif_ptr->image_info_ptr != NULL) { | |
| FX_Free(gif_ptr->image_info_ptr); | |
| } | |
| if(gif_ptr->local_pal != NULL) { | |
| FX_Free(gif_ptr->local_pal); | |
| } | |
| if(gif_ptr->img_encoder_ptr != NULL) { | |
| delete gif_ptr->img_encoder_ptr; | |
| } | |
| #ifdef GIF_SUPPORT_APPLICATION_EXTENSION | |
| if(gif_ptr->app_data != NULL) { | |
| FX_Free(gif_ptr->app_data); | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION | |
| if(gif_ptr->gce_ptr != NULL) { | |
| FX_Free(gif_ptr->gce_ptr); | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_COMMENT_EXTENSION | |
| if(gif_ptr->cmt_data_ptr != NULL) { | |
| FX_Free(gif_ptr->cmt_data_ptr); | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| if(gif_ptr->pte_ptr != NULL) { | |
| FX_Free(gif_ptr->pte_ptr); | |
| } | |
| #endif | |
| FX_Free(gif_ptr); | |
| } | |
| void _gif_error(gif_decompress_struct_p gif_ptr, FX_LPCSTR err_msg) | |
| { | |
| if(gif_ptr != NULL && gif_ptr->_gif_error_fn != NULL) { | |
| gif_ptr->_gif_error_fn(gif_ptr, err_msg); | |
| } | |
| } | |
| void _gif_warn(gif_decompress_struct_p gif_ptr, FX_LPCSTR err_msg) {} | |
| FX_INT32 _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, (FX_LPBYTE*)&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, (FX_LPBYTE*)&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); | |
| FX_INT32 global_pal_size = gif_ptr->global_pal_num * 3; | |
| FX_LPBYTE 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; | |
| if(gif_ptr->global_pal_ptr != NULL) { | |
| FX_Free(gif_ptr->global_pal_ptr); | |
| } | |
| gif_ptr->global_pal_ptr = NULL; | |
| gif_ptr->global_pal_ptr = (GifPalette*)FX_Alloc(FX_BYTE, global_pal_size); | |
| GIF_PTR_NOT_NULL(gif_ptr->global_pal_ptr, gif_ptr); | |
| FXSYS_memcpy32(gif_ptr->global_pal_ptr, global_pal_ptr, global_pal_size); | |
| } | |
| gif_ptr->width = (int)_GetWord_LSBFirst((FX_LPBYTE)&gif_lsd_ptr->width); | |
| gif_ptr->height = (int)_GetWord_LSBFirst((FX_LPBYTE)&gif_lsd_ptr->height); | |
| gif_ptr->bc_index = gif_lsd_ptr->bc_index; | |
| gif_ptr->pixel_aspect = gif_lsd_ptr->pixel_aspect; | |
| return 1; | |
| } | |
| FX_INT32 _gif_get_frame(gif_decompress_struct_p gif_ptr) | |
| { | |
| if(gif_ptr == NULL) { | |
| return 0; | |
| } | |
| FX_INT32 ret = 1; | |
| while (TRUE) { | |
| switch(gif_ptr->decode_status) { | |
| case GIF_D_STATUS_TAIL: | |
| return 1; | |
| case GIF_D_STATUS_SIG: { | |
| FX_LPBYTE 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: { | |
| FX_LPBYTE ext_ptr = NULL; | |
| if(_gif_read_data(gif_ptr, &ext_ptr, 1) == NULL) { | |
| return 2; | |
| } | |
| switch(*ext_ptr) { | |
| #ifdef GIF_SUPPORT_APPLICATION_EXTENSION | |
| case GIF_BLOCK_AE: | |
| _gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_AE); | |
| continue; | |
| #endif | |
| #ifdef GIF_SUPPORT_COMMENT_EXTENSION | |
| case GIF_BLOCK_CE: | |
| _gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_CE); | |
| continue; | |
| #endif | |
| #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION | |
| case GIF_BLOCK_GCE: | |
| _gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_GCE); | |
| continue; | |
| #endif | |
| #ifdef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| case GIF_BLOCK_PTE: | |
| _gif_save_decoding_status(gif_ptr, GIF_D_STATUS_EXT_PTE); | |
| continue; | |
| #endif | |
| default: { | |
| FX_INT32 status = GIF_D_STATUS_EXT_UNE; | |
| #ifndef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| if(*ext_ptr == GIF_BLOCK_PTE) { | |
| status = GIF_D_STATUS_EXT_PTE; | |
| } | |
| #endif | |
| _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: { | |
| FX_LPBYTE data_size_ptr = NULL; | |
| FX_LPBYTE 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; | |
| #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION | |
| if(gif_ptr->gce_ptr != NULL && gce_ptr_ptr != NULL) { | |
| *gce_ptr_ptr = gif_ptr->gce_ptr; | |
| gif_ptr->gce_ptr = NULL; | |
| } | |
| #endif | |
| } | |
| FX_INT32 _gif_decode_extension(gif_decompress_struct_p gif_ptr) | |
| { | |
| FX_LPBYTE data_size_ptr = NULL; | |
| FX_LPBYTE data_ptr = NULL; | |
| FX_DWORD skip_size_org = gif_ptr->skip_size; | |
| switch(gif_ptr->decode_status) { | |
| #ifdef GIF_SUPPORT_APPLICATION_EXTENSION | |
| case GIF_D_STATUS_EXT_AE: { | |
| ASSERT(sizeof(GifAE) == 12); | |
| GifAE* gif_ae_ptr = NULL; | |
| if(_gif_read_data(gif_ptr, (FX_LPBYTE*)&gif_ae_ptr, 12) == NULL) { | |
| return 2; | |
| } | |
| CFX_ByteString gif_ae_data_str; | |
| if(_gif_read_data(gif_ptr, &data_size_ptr, 1) == NULL) { | |
| gif_ptr->skip_size = skip_size_org; | |
| return 2; | |
| } | |
| while(*data_size_ptr != GIF_BLOCK_TERMINAL) { | |
| FX_BYTE 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_ae_data_str += CFX_ByteString((FX_LPCBYTE)data_ptr, data_size); | |
| } | |
| FXSYS_memcpy32(gif_ptr->app_identify, gif_ae_ptr->app_identify, 8); | |
| FXSYS_memcpy32(gif_ptr->app_authentication, gif_ae_ptr->app_authentication, 3); | |
| gif_ptr->app_data_size = gif_ae_data_str.GetLength(); | |
| if(gif_ptr->app_data != NULL) { | |
| FX_Free(gif_ptr->app_data); | |
| gif_ptr->app_data = NULL; | |
| } | |
| gif_ptr->app_data = FX_Alloc(FX_BYTE, gif_ptr->app_data_size); | |
| GIF_PTR_NOT_NULL(gif_ptr->app_data, gif_ptr); | |
| FXSYS_memcpy32(gif_ptr->app_data, FX_LPCBYTE(gif_ae_data_str), gif_ptr->app_data_size); | |
| } | |
| break; | |
| #endif | |
| #ifdef GIF_SUPPORT_COMMENT_EXTENSION | |
| 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) { | |
| FX_BYTE 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((FX_LPCSTR)data_ptr, data_size); | |
| } | |
| } | |
| break; | |
| #endif | |
| #ifdef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| case GIF_D_STATUS_EXT_PTE: { | |
| ASSERT(sizeof(GifPTE) == 13); | |
| GifPTE* gif_pte_ptr = NULL; | |
| if(_gif_read_data(gif_ptr, (FX_LPBYTE*)&gif_pte_ptr, 13) == NULL) { | |
| return 2; | |
| } | |
| GifPlainText* gif_pt_ptr = FX_Alloc(GifPlainText, 1); | |
| GIF_PTR_NOT_NULL(gif_pt_ptr, gif_ptr); | |
| FXSYS_memset32(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(FX_BYTE, sizeof(GifPTE)); | |
| GIF_PTR_NOT_NULL(gif_pt_ptr->pte_ptr, gif_ptr); | |
| gif_pt_ptr->string_ptr = FX_NEW CFX_ByteString; | |
| GIF_PTR_NOT_NULL(gif_pt_ptr->string_ptr, gif_ptr); | |
| gif_pt_ptr->pte_ptr->block_size = gif_pte_ptr->block_size; | |
| gif_pt_ptr->pte_ptr->grid_left = _GetWord_LSBFirst((FX_LPBYTE)&gif_pte_ptr->grid_left); | |
| gif_pt_ptr->pte_ptr->grid_top = _GetWord_LSBFirst((FX_LPBYTE)&gif_pte_ptr->grid_top); | |
| gif_pt_ptr->pte_ptr->grid_width = _GetWord_LSBFirst((FX_LPBYTE)&gif_pte_ptr->grid_width); | |
| gif_pt_ptr->pte_ptr->grid_height = _GetWord_LSBFirst((FX_LPBYTE)&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 != NULL) { | |
| if(gif_pt_ptr->gce_ptr != NULL) { | |
| FX_Free(gif_pt_ptr->gce_ptr); | |
| } | |
| if(gif_pt_ptr->pte_ptr != NULL) { | |
| FX_Free(gif_pt_ptr->pte_ptr); | |
| } | |
| if(gif_pt_ptr->string_ptr != NULL) { | |
| delete gif_pt_ptr->string_ptr; | |
| } | |
| FX_Free(gif_pt_ptr); | |
| } | |
| return 2; | |
| } | |
| while(*data_size_ptr != GIF_BLOCK_TERMINAL) { | |
| FX_BYTE 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 != NULL) { | |
| if(gif_pt_ptr->gce_ptr != NULL) { | |
| FX_Free(gif_pt_ptr->gce_ptr); | |
| } | |
| if(gif_pt_ptr->pte_ptr != NULL) { | |
| FX_Free(gif_pt_ptr->pte_ptr); | |
| } | |
| if(gif_pt_ptr->string_ptr != NULL) { | |
| delete gif_pt_ptr->string_ptr; | |
| } | |
| FX_Free(gif_pt_ptr); | |
| } | |
| return 2; | |
| } | |
| *(gif_pt_ptr->string_ptr) += CFX_ByteString((FX_LPCSTR)data_ptr, data_size); | |
| } | |
| gif_ptr->pt_ptr_arr_ptr->Add(gif_pt_ptr); | |
| } | |
| break; | |
| #endif | |
| #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION | |
| case GIF_D_STATUS_EXT_GCE: { | |
| ASSERT(sizeof(GifGCE) == 5); | |
| GifGCE* gif_gce_ptr = NULL; | |
| if(_gif_read_data(gif_ptr, (FX_LPBYTE*)&gif_gce_ptr, 6) == NULL) { | |
| return 2; | |
| } | |
| if(gif_ptr->gce_ptr == NULL) { | |
| gif_ptr->gce_ptr = (GifGCE*)FX_Alloc(FX_BYTE, sizeof(GifGCE)); | |
| GIF_PTR_NOT_NULL(gif_ptr->gce_ptr, gif_ptr); | |
| } | |
| 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((FX_LPBYTE)&gif_gce_ptr->delay_time); | |
| gif_ptr->gce_ptr->trans_index = gif_gce_ptr->trans_index; | |
| } | |
| break; | |
| #endif | |
| default: { | |
| #ifndef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| if(gif_ptr->decode_status == GIF_D_STATUS_EXT_PTE) { | |
| #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION | |
| if(gif_ptr->gce_ptr != NULL) { | |
| FX_Free(gif_ptr->gce_ptr); | |
| gif_ptr->gce_ptr = NULL; | |
| } | |
| #endif | |
| } | |
| #endif | |
| 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; | |
| } | |
| FX_INT32 _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, (FX_LPBYTE*)&gif_img_info_ptr, 9) == NULL) { | |
| return 2; | |
| } | |
| GifImage* gif_image_ptr = (GifImage*)FX_Alloc(FX_BYTE, sizeof(GifImage)); | |
| GIF_PTR_NOT_NULL(gif_image_ptr, gif_ptr); | |
| FXSYS_memset32(gif_image_ptr, 0, sizeof(GifImage)); | |
| gif_image_ptr->image_info_ptr = (GifImageInfo*)FX_Alloc(FX_BYTE, sizeof(GifImageInfo)); | |
| GIF_PTR_NOT_NULL(gif_image_ptr->image_info_ptr, gif_ptr); | |
| gif_image_ptr->image_info_ptr->left = _GetWord_LSBFirst((FX_LPBYTE)&gif_img_info_ptr->left); | |
| gif_image_ptr->image_info_ptr->top = _GetWord_LSBFirst((FX_LPBYTE)&gif_img_info_ptr->top); | |
| gif_image_ptr->image_info_ptr->width = _GetWord_LSBFirst((FX_LPBYTE)&gif_img_info_ptr->width); | |
| gif_image_ptr->image_info_ptr->height = _GetWord_LSBFirst((FX_LPBYTE)&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) { | |
| if(gif_image_ptr->image_info_ptr != NULL) { | |
| FX_Free(gif_image_ptr->image_info_ptr); | |
| } | |
| if(gif_image_ptr->image_row_buf != NULL) { | |
| 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); | |
| FX_INT32 loc_pal_size = (2 << gif_img_info_lf_ptr->pal_bits) * 3; | |
| FX_LPBYTE loc_pal_ptr = NULL; | |
| if(_gif_read_data(gif_ptr, &loc_pal_ptr, loc_pal_size) == NULL) { | |
| gif_ptr->skip_size = skip_size_org; | |
| if(gif_image_ptr->image_info_ptr != NULL) { | |
| FX_Free(gif_image_ptr->image_info_ptr); | |
| } | |
| if(gif_image_ptr->image_row_buf != NULL) { | |
| 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 != NULL) { | |
| FXSYS_memcpy32((FX_LPBYTE)gif_image_ptr->local_pal_ptr, loc_pal_ptr, loc_pal_size); | |
| } | |
| } | |
| FX_LPBYTE code_size_ptr = NULL; | |
| if(_gif_read_data(gif_ptr, &code_size_ptr, 1) == NULL) { | |
| gif_ptr->skip_size = skip_size_org; | |
| if(gif_image_ptr->image_info_ptr != NULL) { | |
| FX_Free(gif_image_ptr->image_info_ptr); | |
| } | |
| if(gif_image_ptr->local_pal_ptr != NULL) { | |
| FX_Free(gif_image_ptr->local_pal_ptr); | |
| } | |
| if(gif_image_ptr->image_row_buf != NULL) { | |
| 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; | |
| } | |
| FX_INT32 _gif_load_frame(gif_decompress_struct_p gif_ptr, FX_INT32 frame_num) | |
| { | |
| if(gif_ptr == NULL || | |
| frame_num < 0 || | |
| frame_num >= gif_ptr->img_ptr_arr_ptr->GetSize() | |
| ) { | |
| return 0; | |
| } | |
| FX_LPBYTE data_size_ptr = NULL; | |
| FX_LPBYTE 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(FX_BYTE, gif_img_row_bytes); | |
| GIF_PTR_NOT_NULL(gif_image_ptr->image_row_buf, gif_ptr); | |
| GifGCE* gif_img_gce_ptr = gif_image_ptr->image_gce_ptr; | |
| FX_INT32 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, | |
| (FX_INT32)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 ? | |
| (FX_INT32)gif_image_ptr->image_gce_ptr->trans_index : -1, | |
| (FX_INT32)((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 = FX_NEW CGifLZWDecoder(gif_ptr->err_ptr); | |
| GIF_PTR_NOT_NULL(gif_ptr->img_decoder_ptr, gif_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; | |
| FX_INT32 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 >= (FX_INT32)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, FX_INT32 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; | |
| } | |
| FX_LPBYTE _gif_read_data(gif_decompress_struct_p gif_ptr, FX_LPBYTE* 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, FX_LPBYTE 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, FX_LPBYTE* avial_buf_ptr) | |
| { | |
| if(avial_buf_ptr != NULL) { | |
| *avial_buf_ptr = NULL; | |
| if(gif_ptr->avail_in > 0) { | |
| *avial_buf_ptr = gif_ptr->next_in; | |
| } | |
| } | |
| return gif_ptr->avail_in; | |
| } | |
| FX_INT32 _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, FX_LPBYTE& dst_buf, FX_DWORD& dst_len ) | |
| { | |
| if (gif_ptr->cur_offset) { | |
| return TRUE; | |
| } | |
| dst_len = sizeof(GifHeader) + sizeof(GifLSD) + sizeof(GifGF); | |
| dst_buf = FX_AllocNL(FX_BYTE, dst_len); | |
| if (dst_buf == NULL) { | |
| return FALSE; | |
| } | |
| FXSYS_memset32(dst_buf, 0, dst_len); | |
| FXSYS_memcpy32(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_memcpy32(&dst_buf[gif_ptr->cur_offset], gif_ptr->global_pal, size); | |
| gif_ptr->cur_offset += size; | |
| } | |
| return TRUE; | |
| } | |
| void interlace_buf(FX_LPCBYTE buf, FX_DWORD pitch, FX_DWORD height) | |
| { | |
| CFX_ArrayTemplate<FX_LPBYTE> pass[4]; | |
| int i, j; | |
| FX_DWORD row; | |
| row = 0; | |
| FX_LPBYTE 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(FX_BYTE, pitch); | |
| if (temp == NULL) { | |
| return; | |
| } | |
| FXSYS_memcpy32(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_memcpy32((FX_LPBYTE)&buf[pitch * row], pass[i].GetAt(j), pitch); | |
| FX_Free(pass[i].GetAt(j)); | |
| } | |
| } | |
| } | |
| static void _gif_write_block_data(FX_LPCBYTE src_buf, FX_DWORD src_len, FX_LPBYTE& 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_memcpy32(&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++] = (FX_BYTE)src_len; | |
| FXSYS_memcpy32(&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, FX_LPBYTE& dst_buf, FX_DWORD& dst_len ) | |
| { | |
| if (!_gif_grow_buf(dst_buf, dst_len, gif_ptr->cur_offset + GIF_DATA_BLOCK)) { | |
| return FALSE; | |
| } | |
| #ifdef GIF_SUPPORT_GRAPHIC_CONTROL_EXTENSION | |
| if (FXSYS_memcmp32(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; | |
| } | |
| #endif | |
| 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_memcpy32(&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); | |
| } | |
| FX_BYTE 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; | |
| #ifdef GIF_SUPPORT_COMMENT_EXTENSION | |
| if (FXSYS_memcmp32(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; | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_PLAIN_TEXT_EXTENSION | |
| if (FXSYS_memcmp32(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; | |
| } | |
| #endif | |
| #ifdef GIF_SUPPORT_APPLICATION_EXTENSION | |
| if (FXSYS_memcmp32(gif_ptr->header_ptr->version, "89a", 3) == 0 && gif_ptr->app_data) { | |
| dst_buf[gif_ptr->cur_offset++] = GIF_SIG_EXTENSION; | |
| dst_buf[gif_ptr->cur_offset++] = GIF_BLOCK_AE; | |
| dst_buf[gif_ptr->cur_offset++] = 11; | |
| FXSYS_memcpy32(&dst_buf[gif_ptr->cur_offset], gif_ptr->app_identify, 8); | |
| gif_ptr->cur_offset += 8; | |
| FXSYS_memcpy32(&dst_buf[gif_ptr->cur_offset], gif_ptr->app_authentication, 8); | |
| gif_ptr->cur_offset += 3; | |
| FXSYS_memcpy32(&dst_buf[gif_ptr->cur_offset], gif_ptr->app_data, gif_ptr->app_data_size); | |
| gif_ptr->cur_offset += gif_ptr->app_data_size; | |
| dst_buf[gif_ptr->cur_offset++] = 0; | |
| } | |
| #endif | |
| dst_buf[gif_ptr->cur_offset++] = GIF_SIG_TRAILER; | |
| return TRUE; | |
| } | |
| FX_BOOL _gif_encode( gif_compress_struct_p gif_ptr, FX_LPBYTE& 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; | |
| } |