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/* pngpread.c - read a png file in push mode
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*
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* Last changed in libpng 1.2.38 [July 16, 2009]
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*/
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#define PNG_INTERNAL
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#include "png.h"
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#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
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/* Push model modes */
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#define PNG_READ_SIG_MODE 0
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#define PNG_READ_CHUNK_MODE 1
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#define PNG_READ_IDAT_MODE 2
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#define PNG_SKIP_MODE 3
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#define PNG_READ_tEXt_MODE 4
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#define PNG_READ_zTXt_MODE 5
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#define PNG_READ_DONE_MODE 6
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#define PNG_READ_iTXt_MODE 7
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#define PNG_ERROR_MODE 8
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void PNGAPI
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png_process_data(png_structp png_ptr, png_infop info_ptr,
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png_bytep buffer, png_size_t buffer_size)
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{
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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png_push_restore_buffer(png_ptr, buffer, buffer_size);
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while (png_ptr->buffer_size)
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{
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png_process_some_data(png_ptr, info_ptr);
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}
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}
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/* What we do with the incoming data depends on what we were previously
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* doing before we ran out of data...
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*/
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void /* PRIVATE */
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png_process_some_data(png_structp png_ptr, png_infop info_ptr)
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{
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if (png_ptr == NULL)
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return;
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switch (png_ptr->process_mode)
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{
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case PNG_READ_SIG_MODE:
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{
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png_push_read_sig(png_ptr, info_ptr);
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break;
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}
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case PNG_READ_CHUNK_MODE:
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{
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png_push_read_chunk(png_ptr, info_ptr);
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break;
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}
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case PNG_READ_IDAT_MODE:
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{
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png_push_read_IDAT(png_ptr);
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break;
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}
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#if defined(PNG_READ_tEXt_SUPPORTED)
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case PNG_READ_tEXt_MODE:
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{
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png_push_read_tEXt(png_ptr, info_ptr);
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break;
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}
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#endif
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#if defined(PNG_READ_zTXt_SUPPORTED)
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case PNG_READ_zTXt_MODE:
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{
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png_push_read_zTXt(png_ptr, info_ptr);
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break;
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}
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#endif
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#if defined(PNG_READ_iTXt_SUPPORTED)
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case PNG_READ_iTXt_MODE:
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{
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png_push_read_iTXt(png_ptr, info_ptr);
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break;
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}
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#endif
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case PNG_SKIP_MODE:
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{
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png_push_crc_finish(png_ptr);
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break;
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}
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default:
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{
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png_ptr->buffer_size = 0;
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break;
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}
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}
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}
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/* Read any remaining signature bytes from the stream and compare them with
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* the correct PNG signature. It is possible that this routine is called
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* with bytes already read from the signature, either because they have been
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* checked by the calling application, or because of multiple calls to this
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* routine.
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*/
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void /* PRIVATE */
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png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
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{
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png_size_t num_checked = png_ptr->sig_bytes,
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num_to_check = 8 - num_checked;
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if (png_ptr->buffer_size < num_to_check)
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{
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num_to_check = png_ptr->buffer_size;
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}
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png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
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num_to_check);
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png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check);
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if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
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{
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if (num_checked < 4 &&
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png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
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png_error(png_ptr, "Not a PNG file");
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else
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png_error(png_ptr, "PNG file corrupted by ASCII conversion");
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}
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else
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{
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if (png_ptr->sig_bytes >= 8)
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{
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png_ptr->process_mode = PNG_READ_CHUNK_MODE;
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}
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}
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}
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void /* PRIVATE */
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png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
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{
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#ifdef PNG_USE_LOCAL_ARRAYS
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PNG_CONST PNG_IHDR;
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PNG_CONST PNG_IDAT;
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PNG_CONST PNG_IEND;
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PNG_CONST PNG_PLTE;
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#if defined(PNG_READ_bKGD_SUPPORTED)
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PNG_CONST PNG_bKGD;
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#endif
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#if defined(PNG_READ_cHRM_SUPPORTED)
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PNG_CONST PNG_cHRM;
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#endif
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#if defined(PNG_READ_gAMA_SUPPORTED)
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PNG_CONST PNG_gAMA;
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#endif
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#if defined(PNG_READ_hIST_SUPPORTED)
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PNG_CONST PNG_hIST;
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#endif
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#if defined(PNG_READ_iCCP_SUPPORTED)
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PNG_CONST PNG_iCCP;
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#endif
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#if defined(PNG_READ_iTXt_SUPPORTED)
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PNG_CONST PNG_iTXt;
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#endif
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#if defined(PNG_READ_oFFs_SUPPORTED)
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PNG_CONST PNG_oFFs;
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#endif
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#if defined(PNG_READ_pCAL_SUPPORTED)
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PNG_CONST PNG_pCAL;
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#endif
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#if defined(PNG_READ_pHYs_SUPPORTED)
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PNG_CONST PNG_pHYs;
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#endif
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#if defined(PNG_READ_sBIT_SUPPORTED)
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PNG_CONST PNG_sBIT;
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#endif
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#if defined(PNG_READ_sCAL_SUPPORTED)
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PNG_CONST PNG_sCAL;
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#endif
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#if defined(PNG_READ_sRGB_SUPPORTED)
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PNG_CONST PNG_sRGB;
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#endif
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#if defined(PNG_READ_sPLT_SUPPORTED)
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PNG_CONST PNG_sPLT;
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#endif
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#if defined(PNG_READ_tEXt_SUPPORTED)
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PNG_CONST PNG_tEXt;
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#endif
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#if defined(PNG_READ_tIME_SUPPORTED)
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PNG_CONST PNG_tIME;
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#endif
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#if defined(PNG_READ_tRNS_SUPPORTED)
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PNG_CONST PNG_tRNS;
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#endif
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#if defined(PNG_READ_zTXt_SUPPORTED)
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PNG_CONST PNG_zTXt;
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#endif
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#endif /* PNG_USE_LOCAL_ARRAYS */
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/* First we make sure we have enough data for the 4 byte chunk name
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* and the 4 byte chunk length before proceeding with decoding the
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* chunk data. To fully decode each of these chunks, we also make
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* sure we have enough data in the buffer for the 4 byte CRC at the
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* end of every chunk (except IDAT, which is handled separately).
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*/
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if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
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{
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png_byte chunk_length[4];
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if (png_ptr->buffer_size < 8)
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{
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png_push_save_buffer(png_ptr);
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return;
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}
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png_push_fill_buffer(png_ptr, chunk_length, 4);
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png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
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png_reset_crc(png_ptr);
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png_crc_read(png_ptr, png_ptr->chunk_name, 4);
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png_check_chunk_name(png_ptr, png_ptr->chunk_name);
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png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
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}
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if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
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if (png_ptr->mode & PNG_AFTER_IDAT)
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png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
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if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
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{
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if (png_ptr->push_length != 13)
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png_error(png_ptr, "Invalid IHDR length");
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
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{
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png_push_save_buffer(png_ptr);
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return;
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}
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png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
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}
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else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
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{
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
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{
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png_push_save_buffer(png_ptr);
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return;
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}
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png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
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png_ptr->process_mode = PNG_READ_DONE_MODE;
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png_push_have_end(png_ptr, info_ptr);
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}
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#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
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else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
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{
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
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{
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png_push_save_buffer(png_ptr);
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return;
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}
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if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
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png_ptr->mode |= PNG_HAVE_IDAT;
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png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
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if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
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png_ptr->mode |= PNG_HAVE_PLTE;
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else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
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{
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if (!(png_ptr->mode & PNG_HAVE_IHDR))
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png_error(png_ptr, "Missing IHDR before IDAT");
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else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
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!(png_ptr->mode & PNG_HAVE_PLTE))
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png_error(png_ptr, "Missing PLTE before IDAT");
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}
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}
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#endif
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else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
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{
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if (png_ptr->push_length + 4 > png_ptr->buffer_size)
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{
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png_push_save_buffer(png_ptr);
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299 |
return;
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}
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png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
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}
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else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
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{
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/* If we reach an IDAT chunk, this means we have read all of the
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* header chunks, and we can start reading the image (or if this
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* is called after the image has been read - we have an error).
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*/
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310 |
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311 |
if (!(png_ptr->mode & PNG_HAVE_IHDR))
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png_error(png_ptr, "Missing IHDR before IDAT");
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313 |
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else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
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!(png_ptr->mode & PNG_HAVE_PLTE))
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png_error(png_ptr, "Missing PLTE before IDAT");
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317 |
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318 |
if (png_ptr->mode & PNG_HAVE_IDAT)
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{
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320 |
if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
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321 |
if (png_ptr->push_length == 0)
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return;
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323 |
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324 |
if (png_ptr->mode & PNG_AFTER_IDAT)
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png_error(png_ptr, "Too many IDAT's found");
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326 |
}
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328 |
png_ptr->idat_size = png_ptr->push_length;
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329 |
png_ptr->mode |= PNG_HAVE_IDAT;
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330 |
png_ptr->process_mode = PNG_READ_IDAT_MODE;
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png_push_have_info(png_ptr, info_ptr);
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332 |
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
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png_ptr->zstream.next_out = png_ptr->row_buf;
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334 |
return;
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335 |
}
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336 |
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337 |
#if defined(PNG_READ_gAMA_SUPPORTED)
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else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
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{
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340 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
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341 |
{
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342 |
png_push_save_buffer(png_ptr);
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343 |
return;
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344 |
}
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345 |
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346 |
png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
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347 |
}
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348 |
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349 |
#endif
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350 |
#if defined(PNG_READ_sBIT_SUPPORTED)
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351 |
else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
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352 |
{
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|
353 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
354 |
{
|
|
|
355 |
png_push_save_buffer(png_ptr);
|
|
|
356 |
return;
|
|
|
357 |
}
|
|
|
358 |
|
|
|
359 |
png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
360 |
}
|
|
|
361 |
|
|
|
362 |
#endif
|
|
|
363 |
#if defined(PNG_READ_cHRM_SUPPORTED)
|
|
|
364 |
else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
|
|
|
365 |
{
|
|
|
366 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
367 |
{
|
|
|
368 |
png_push_save_buffer(png_ptr);
|
|
|
369 |
return;
|
|
|
370 |
}
|
|
|
371 |
|
|
|
372 |
png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
373 |
}
|
|
|
374 |
|
|
|
375 |
#endif
|
|
|
376 |
#if defined(PNG_READ_sRGB_SUPPORTED)
|
|
|
377 |
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
|
|
|
378 |
{
|
|
|
379 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
380 |
{
|
|
|
381 |
png_push_save_buffer(png_ptr);
|
|
|
382 |
return;
|
|
|
383 |
}
|
|
|
384 |
|
|
|
385 |
png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
386 |
}
|
|
|
387 |
|
|
|
388 |
#endif
|
|
|
389 |
#if defined(PNG_READ_iCCP_SUPPORTED)
|
|
|
390 |
else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
|
|
|
391 |
{
|
|
|
392 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
393 |
{
|
|
|
394 |
png_push_save_buffer(png_ptr);
|
|
|
395 |
return;
|
|
|
396 |
}
|
|
|
397 |
|
|
|
398 |
png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
399 |
}
|
|
|
400 |
|
|
|
401 |
#endif
|
|
|
402 |
#if defined(PNG_READ_sPLT_SUPPORTED)
|
|
|
403 |
else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
|
|
|
404 |
{
|
|
|
405 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
406 |
{
|
|
|
407 |
png_push_save_buffer(png_ptr);
|
|
|
408 |
return;
|
|
|
409 |
}
|
|
|
410 |
|
|
|
411 |
png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
412 |
}
|
|
|
413 |
|
|
|
414 |
#endif
|
|
|
415 |
#if defined(PNG_READ_tRNS_SUPPORTED)
|
|
|
416 |
else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
|
|
|
417 |
{
|
|
|
418 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
419 |
{
|
|
|
420 |
png_push_save_buffer(png_ptr);
|
|
|
421 |
return;
|
|
|
422 |
}
|
|
|
423 |
|
|
|
424 |
png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
425 |
}
|
|
|
426 |
|
|
|
427 |
#endif
|
|
|
428 |
#if defined(PNG_READ_bKGD_SUPPORTED)
|
|
|
429 |
else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
|
|
|
430 |
{
|
|
|
431 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
432 |
{
|
|
|
433 |
png_push_save_buffer(png_ptr);
|
|
|
434 |
return;
|
|
|
435 |
}
|
|
|
436 |
|
|
|
437 |
png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
438 |
}
|
|
|
439 |
|
|
|
440 |
#endif
|
|
|
441 |
#if defined(PNG_READ_hIST_SUPPORTED)
|
|
|
442 |
else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
|
|
|
443 |
{
|
|
|
444 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
445 |
{
|
|
|
446 |
png_push_save_buffer(png_ptr);
|
|
|
447 |
return;
|
|
|
448 |
}
|
|
|
449 |
|
|
|
450 |
png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
451 |
}
|
|
|
452 |
|
|
|
453 |
#endif
|
|
|
454 |
#if defined(PNG_READ_pHYs_SUPPORTED)
|
|
|
455 |
else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
|
|
|
456 |
{
|
|
|
457 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
458 |
{
|
|
|
459 |
png_push_save_buffer(png_ptr);
|
|
|
460 |
return;
|
|
|
461 |
}
|
|
|
462 |
|
|
|
463 |
png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
464 |
}
|
|
|
465 |
|
|
|
466 |
#endif
|
|
|
467 |
#if defined(PNG_READ_oFFs_SUPPORTED)
|
|
|
468 |
else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
|
|
|
469 |
{
|
|
|
470 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
471 |
{
|
|
|
472 |
png_push_save_buffer(png_ptr);
|
|
|
473 |
return;
|
|
|
474 |
}
|
|
|
475 |
|
|
|
476 |
png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
477 |
}
|
|
|
478 |
#endif
|
|
|
479 |
|
|
|
480 |
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
|
481 |
else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
|
|
|
482 |
{
|
|
|
483 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
484 |
{
|
|
|
485 |
png_push_save_buffer(png_ptr);
|
|
|
486 |
return;
|
|
|
487 |
}
|
|
|
488 |
|
|
|
489 |
png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
490 |
}
|
|
|
491 |
|
|
|
492 |
#endif
|
|
|
493 |
#if defined(PNG_READ_sCAL_SUPPORTED)
|
|
|
494 |
else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
|
|
|
495 |
{
|
|
|
496 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
497 |
{
|
|
|
498 |
png_push_save_buffer(png_ptr);
|
|
|
499 |
return;
|
|
|
500 |
}
|
|
|
501 |
|
|
|
502 |
png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
503 |
}
|
|
|
504 |
|
|
|
505 |
#endif
|
|
|
506 |
#if defined(PNG_READ_tIME_SUPPORTED)
|
|
|
507 |
else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
|
|
|
508 |
{
|
|
|
509 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
510 |
{
|
|
|
511 |
png_push_save_buffer(png_ptr);
|
|
|
512 |
return;
|
|
|
513 |
}
|
|
|
514 |
|
|
|
515 |
png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
516 |
}
|
|
|
517 |
|
|
|
518 |
#endif
|
|
|
519 |
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
|
520 |
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
|
|
|
521 |
{
|
|
|
522 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
523 |
{
|
|
|
524 |
png_push_save_buffer(png_ptr);
|
|
|
525 |
return;
|
|
|
526 |
}
|
|
|
527 |
|
|
|
528 |
png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
529 |
}
|
|
|
530 |
|
|
|
531 |
#endif
|
|
|
532 |
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
|
533 |
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
|
|
|
534 |
{
|
|
|
535 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
536 |
{
|
|
|
537 |
png_push_save_buffer(png_ptr);
|
|
|
538 |
return;
|
|
|
539 |
}
|
|
|
540 |
|
|
|
541 |
png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
542 |
}
|
|
|
543 |
|
|
|
544 |
#endif
|
|
|
545 |
#if defined(PNG_READ_iTXt_SUPPORTED)
|
|
|
546 |
else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
|
|
|
547 |
{
|
|
|
548 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
549 |
{
|
|
|
550 |
png_push_save_buffer(png_ptr);
|
|
|
551 |
return;
|
|
|
552 |
}
|
|
|
553 |
|
|
|
554 |
png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
555 |
}
|
|
|
556 |
|
|
|
557 |
#endif
|
|
|
558 |
else
|
|
|
559 |
{
|
|
|
560 |
if (png_ptr->push_length + 4 > png_ptr->buffer_size)
|
|
|
561 |
{
|
|
|
562 |
png_push_save_buffer(png_ptr);
|
|
|
563 |
return;
|
|
|
564 |
}
|
|
|
565 |
png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
|
|
|
566 |
}
|
|
|
567 |
|
|
|
568 |
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
|
|
|
569 |
}
|
|
|
570 |
|
|
|
571 |
void /* PRIVATE */
|
|
|
572 |
png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
|
|
|
573 |
{
|
|
|
574 |
png_ptr->process_mode = PNG_SKIP_MODE;
|
|
|
575 |
png_ptr->skip_length = skip;
|
|
|
576 |
}
|
|
|
577 |
|
|
|
578 |
void /* PRIVATE */
|
|
|
579 |
png_push_crc_finish(png_structp png_ptr)
|
|
|
580 |
{
|
|
|
581 |
if (png_ptr->skip_length && png_ptr->save_buffer_size)
|
|
|
582 |
{
|
|
|
583 |
png_size_t save_size;
|
|
|
584 |
|
|
|
585 |
if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
|
|
|
586 |
save_size = (png_size_t)png_ptr->skip_length;
|
|
|
587 |
else
|
|
|
588 |
save_size = png_ptr->save_buffer_size;
|
|
|
589 |
|
|
|
590 |
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
|
|
|
591 |
|
|
|
592 |
png_ptr->skip_length -= save_size;
|
|
|
593 |
png_ptr->buffer_size -= save_size;
|
|
|
594 |
png_ptr->save_buffer_size -= save_size;
|
|
|
595 |
png_ptr->save_buffer_ptr += save_size;
|
|
|
596 |
}
|
|
|
597 |
if (png_ptr->skip_length && png_ptr->current_buffer_size)
|
|
|
598 |
{
|
|
|
599 |
png_size_t save_size;
|
|
|
600 |
|
|
|
601 |
if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
|
|
|
602 |
save_size = (png_size_t)png_ptr->skip_length;
|
|
|
603 |
else
|
|
|
604 |
save_size = png_ptr->current_buffer_size;
|
|
|
605 |
|
|
|
606 |
png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
|
|
|
607 |
|
|
|
608 |
png_ptr->skip_length -= save_size;
|
|
|
609 |
png_ptr->buffer_size -= save_size;
|
|
|
610 |
png_ptr->current_buffer_size -= save_size;
|
|
|
611 |
png_ptr->current_buffer_ptr += save_size;
|
|
|
612 |
}
|
|
|
613 |
if (!png_ptr->skip_length)
|
|
|
614 |
{
|
|
|
615 |
if (png_ptr->buffer_size < 4)
|
|
|
616 |
{
|
|
|
617 |
png_push_save_buffer(png_ptr);
|
|
|
618 |
return;
|
|
|
619 |
}
|
|
|
620 |
|
|
|
621 |
png_crc_finish(png_ptr, 0);
|
|
|
622 |
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
|
|
|
623 |
}
|
|
|
624 |
}
|
|
|
625 |
|
|
|
626 |
void PNGAPI
|
|
|
627 |
png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
|
|
|
628 |
{
|
|
|
629 |
png_bytep ptr;
|
|
|
630 |
|
|
|
631 |
if (png_ptr == NULL)
|
|
|
632 |
return;
|
|
|
633 |
|
|
|
634 |
ptr = buffer;
|
|
|
635 |
if (png_ptr->save_buffer_size)
|
|
|
636 |
{
|
|
|
637 |
png_size_t save_size;
|
|
|
638 |
|
|
|
639 |
if (length < png_ptr->save_buffer_size)
|
|
|
640 |
save_size = length;
|
|
|
641 |
else
|
|
|
642 |
save_size = png_ptr->save_buffer_size;
|
|
|
643 |
|
|
|
644 |
png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
|
|
|
645 |
length -= save_size;
|
|
|
646 |
ptr += save_size;
|
|
|
647 |
png_ptr->buffer_size -= save_size;
|
|
|
648 |
png_ptr->save_buffer_size -= save_size;
|
|
|
649 |
png_ptr->save_buffer_ptr += save_size;
|
|
|
650 |
}
|
|
|
651 |
if (length && png_ptr->current_buffer_size)
|
|
|
652 |
{
|
|
|
653 |
png_size_t save_size;
|
|
|
654 |
|
|
|
655 |
if (length < png_ptr->current_buffer_size)
|
|
|
656 |
save_size = length;
|
|
|
657 |
|
|
|
658 |
else
|
|
|
659 |
save_size = png_ptr->current_buffer_size;
|
|
|
660 |
|
|
|
661 |
png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
|
|
|
662 |
png_ptr->buffer_size -= save_size;
|
|
|
663 |
png_ptr->current_buffer_size -= save_size;
|
|
|
664 |
png_ptr->current_buffer_ptr += save_size;
|
|
|
665 |
}
|
|
|
666 |
}
|
|
|
667 |
|
|
|
668 |
void /* PRIVATE */
|
|
|
669 |
png_push_save_buffer(png_structp png_ptr)
|
|
|
670 |
{
|
|
|
671 |
if (png_ptr->save_buffer_size)
|
|
|
672 |
{
|
|
|
673 |
if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
|
|
|
674 |
{
|
|
|
675 |
png_size_t i, istop;
|
|
|
676 |
png_bytep sp;
|
|
|
677 |
png_bytep dp;
|
|
|
678 |
|
|
|
679 |
istop = png_ptr->save_buffer_size;
|
|
|
680 |
for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
|
|
|
681 |
i < istop; i++, sp++, dp++)
|
|
|
682 |
{
|
|
|
683 |
*dp = *sp;
|
|
|
684 |
}
|
|
|
685 |
}
|
|
|
686 |
}
|
|
|
687 |
if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
|
|
|
688 |
png_ptr->save_buffer_max)
|
|
|
689 |
{
|
|
|
690 |
png_size_t new_max;
|
|
|
691 |
png_bytep old_buffer;
|
|
|
692 |
|
|
|
693 |
if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
|
|
|
694 |
(png_ptr->current_buffer_size + 256))
|
|
|
695 |
{
|
|
|
696 |
png_error(png_ptr, "Potential overflow of save_buffer");
|
|
|
697 |
}
|
|
|
698 |
|
|
|
699 |
new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
|
|
|
700 |
old_buffer = png_ptr->save_buffer;
|
|
|
701 |
png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
|
|
|
702 |
(png_uint_32)new_max);
|
|
|
703 |
png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
|
|
|
704 |
png_free(png_ptr, old_buffer);
|
|
|
705 |
png_ptr->save_buffer_max = new_max;
|
|
|
706 |
}
|
|
|
707 |
if (png_ptr->current_buffer_size)
|
|
|
708 |
{
|
|
|
709 |
png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
|
|
|
710 |
png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
|
|
|
711 |
png_ptr->save_buffer_size += png_ptr->current_buffer_size;
|
|
|
712 |
png_ptr->current_buffer_size = 0;
|
|
|
713 |
}
|
|
|
714 |
png_ptr->save_buffer_ptr = png_ptr->save_buffer;
|
|
|
715 |
png_ptr->buffer_size = 0;
|
|
|
716 |
}
|
|
|
717 |
|
|
|
718 |
void /* PRIVATE */
|
|
|
719 |
png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
|
|
|
720 |
png_size_t buffer_length)
|
|
|
721 |
{
|
|
|
722 |
png_ptr->current_buffer = buffer;
|
|
|
723 |
png_ptr->current_buffer_size = buffer_length;
|
|
|
724 |
png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
|
|
|
725 |
png_ptr->current_buffer_ptr = png_ptr->current_buffer;
|
|
|
726 |
}
|
|
|
727 |
|
|
|
728 |
void /* PRIVATE */
|
|
|
729 |
png_push_read_IDAT(png_structp png_ptr)
|
|
|
730 |
{
|
|
|
731 |
#ifdef PNG_USE_LOCAL_ARRAYS
|
|
|
732 |
PNG_CONST PNG_IDAT;
|
|
|
733 |
#endif
|
|
|
734 |
if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
|
|
|
735 |
{
|
|
|
736 |
png_byte chunk_length[4];
|
|
|
737 |
|
|
|
738 |
if (png_ptr->buffer_size < 8)
|
|
|
739 |
{
|
|
|
740 |
png_push_save_buffer(png_ptr);
|
|
|
741 |
return;
|
|
|
742 |
}
|
|
|
743 |
|
|
|
744 |
png_push_fill_buffer(png_ptr, chunk_length, 4);
|
|
|
745 |
png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
|
|
|
746 |
png_reset_crc(png_ptr);
|
|
|
747 |
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
|
|
|
748 |
png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
|
|
|
749 |
|
|
|
750 |
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
|
|
|
751 |
{
|
|
|
752 |
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
|
|
|
753 |
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
|
|
|
754 |
png_error(png_ptr, "Not enough compressed data");
|
|
|
755 |
return;
|
|
|
756 |
}
|
|
|
757 |
|
|
|
758 |
png_ptr->idat_size = png_ptr->push_length;
|
|
|
759 |
}
|
|
|
760 |
if (png_ptr->idat_size && png_ptr->save_buffer_size)
|
|
|
761 |
{
|
|
|
762 |
png_size_t save_size;
|
|
|
763 |
|
|
|
764 |
if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
|
|
|
765 |
{
|
|
|
766 |
save_size = (png_size_t)png_ptr->idat_size;
|
|
|
767 |
|
|
|
768 |
/* Check for overflow */
|
|
|
769 |
if ((png_uint_32)save_size != png_ptr->idat_size)
|
|
|
770 |
png_error(png_ptr, "save_size overflowed in pngpread");
|
|
|
771 |
}
|
|
|
772 |
else
|
|
|
773 |
save_size = png_ptr->save_buffer_size;
|
|
|
774 |
|
|
|
775 |
png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
|
|
|
776 |
|
|
|
777 |
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
|
|
|
778 |
png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
|
|
|
779 |
|
|
|
780 |
png_ptr->idat_size -= save_size;
|
|
|
781 |
png_ptr->buffer_size -= save_size;
|
|
|
782 |
png_ptr->save_buffer_size -= save_size;
|
|
|
783 |
png_ptr->save_buffer_ptr += save_size;
|
|
|
784 |
}
|
|
|
785 |
if (png_ptr->idat_size && png_ptr->current_buffer_size)
|
|
|
786 |
{
|
|
|
787 |
png_size_t save_size;
|
|
|
788 |
|
|
|
789 |
if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
|
|
|
790 |
{
|
|
|
791 |
save_size = (png_size_t)png_ptr->idat_size;
|
|
|
792 |
|
|
|
793 |
/* Check for overflow */
|
|
|
794 |
if ((png_uint_32)save_size != png_ptr->idat_size)
|
|
|
795 |
png_error(png_ptr, "save_size overflowed in pngpread");
|
|
|
796 |
}
|
|
|
797 |
else
|
|
|
798 |
save_size = png_ptr->current_buffer_size;
|
|
|
799 |
|
|
|
800 |
png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
|
|
|
801 |
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
|
|
|
802 |
png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
|
|
|
803 |
|
|
|
804 |
png_ptr->idat_size -= save_size;
|
|
|
805 |
png_ptr->buffer_size -= save_size;
|
|
|
806 |
png_ptr->current_buffer_size -= save_size;
|
|
|
807 |
png_ptr->current_buffer_ptr += save_size;
|
|
|
808 |
}
|
|
|
809 |
if (!png_ptr->idat_size)
|
|
|
810 |
{
|
|
|
811 |
if (png_ptr->buffer_size < 4)
|
|
|
812 |
{
|
|
|
813 |
png_push_save_buffer(png_ptr);
|
|
|
814 |
return;
|
|
|
815 |
}
|
|
|
816 |
|
|
|
817 |
png_crc_finish(png_ptr, 0);
|
|
|
818 |
png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
|
|
|
819 |
png_ptr->mode |= PNG_AFTER_IDAT;
|
|
|
820 |
}
|
|
|
821 |
}
|
|
|
822 |
|
|
|
823 |
void /* PRIVATE */
|
|
|
824 |
png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
|
|
|
825 |
png_size_t buffer_length)
|
|
|
826 |
{
|
|
|
827 |
int ret;
|
|
|
828 |
|
|
|
829 |
if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length)
|
|
|
830 |
png_error(png_ptr, "Extra compression data");
|
|
|
831 |
|
|
|
832 |
png_ptr->zstream.next_in = buffer;
|
|
|
833 |
png_ptr->zstream.avail_in = (uInt)buffer_length;
|
|
|
834 |
for (;;)
|
|
|
835 |
{
|
|
|
836 |
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
|
|
|
837 |
if (ret != Z_OK)
|
|
|
838 |
{
|
|
|
839 |
if (ret == Z_STREAM_END)
|
|
|
840 |
{
|
|
|
841 |
if (png_ptr->zstream.avail_in)
|
|
|
842 |
png_error(png_ptr, "Extra compressed data");
|
|
|
843 |
|
|
|
844 |
if (!(png_ptr->zstream.avail_out))
|
|
|
845 |
{
|
|
|
846 |
png_push_process_row(png_ptr);
|
|
|
847 |
}
|
|
|
848 |
|
|
|
849 |
png_ptr->mode |= PNG_AFTER_IDAT;
|
|
|
850 |
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
|
|
|
851 |
break;
|
|
|
852 |
}
|
|
|
853 |
else if (ret == Z_BUF_ERROR)
|
|
|
854 |
break;
|
|
|
855 |
|
|
|
856 |
else
|
|
|
857 |
png_error(png_ptr, "Decompression Error");
|
|
|
858 |
}
|
|
|
859 |
if (!(png_ptr->zstream.avail_out))
|
|
|
860 |
{
|
|
|
861 |
if ((
|
|
|
862 |
#if defined(PNG_READ_INTERLACING_SUPPORTED)
|
|
|
863 |
png_ptr->interlaced && png_ptr->pass > 6) ||
|
|
|
864 |
(!png_ptr->interlaced &&
|
|
|
865 |
#endif
|
|
|
866 |
png_ptr->row_number == png_ptr->num_rows))
|
|
|
867 |
{
|
|
|
868 |
if (png_ptr->zstream.avail_in)
|
|
|
869 |
png_warning(png_ptr, "Too much data in IDAT chunks");
|
|
|
870 |
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
|
|
|
871 |
break;
|
|
|
872 |
}
|
|
|
873 |
png_push_process_row(png_ptr);
|
|
|
874 |
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
|
|
|
875 |
png_ptr->zstream.next_out = png_ptr->row_buf;
|
|
|
876 |
}
|
|
|
877 |
|
|
|
878 |
else
|
|
|
879 |
break;
|
|
|
880 |
}
|
|
|
881 |
}
|
|
|
882 |
|
|
|
883 |
void /* PRIVATE */
|
|
|
884 |
png_push_process_row(png_structp png_ptr)
|
|
|
885 |
{
|
|
|
886 |
png_ptr->row_info.color_type = png_ptr->color_type;
|
|
|
887 |
png_ptr->row_info.width = png_ptr->iwidth;
|
|
|
888 |
png_ptr->row_info.channels = png_ptr->channels;
|
|
|
889 |
png_ptr->row_info.bit_depth = png_ptr->bit_depth;
|
|
|
890 |
png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
|
|
|
891 |
|
|
|
892 |
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
|
|
|
893 |
png_ptr->row_info.width);
|
|
|
894 |
|
|
|
895 |
png_read_filter_row(png_ptr, &(png_ptr->row_info),
|
|
|
896 |
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
|
|
|
897 |
(int)(png_ptr->row_buf[0]));
|
|
|
898 |
|
|
|
899 |
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
|
|
|
900 |
png_ptr->rowbytes + 1);
|
|
|
901 |
|
|
|
902 |
if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
|
|
|
903 |
png_do_read_transformations(png_ptr);
|
|
|
904 |
|
|
|
905 |
#if defined(PNG_READ_INTERLACING_SUPPORTED)
|
|
|
906 |
/* Blow up interlaced rows to full size */
|
|
|
907 |
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
|
|
|
908 |
{
|
|
|
909 |
if (png_ptr->pass < 6)
|
|
|
910 |
/* old interface (pre-1.0.9):
|
|
|
911 |
png_do_read_interlace(&(png_ptr->row_info),
|
|
|
912 |
png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
|
|
|
913 |
*/
|
|
|
914 |
png_do_read_interlace(png_ptr);
|
|
|
915 |
|
|
|
916 |
switch (png_ptr->pass)
|
|
|
917 |
{
|
|
|
918 |
case 0:
|
|
|
919 |
{
|
|
|
920 |
int i;
|
|
|
921 |
for (i = 0; i < 8 && png_ptr->pass == 0; i++)
|
|
|
922 |
{
|
|
|
923 |
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
|
|
|
924 |
png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */
|
|
|
925 |
}
|
|
|
926 |
|
|
|
927 |
if (png_ptr->pass == 2) /* Pass 1 might be empty */
|
|
|
928 |
{
|
|
|
929 |
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
|
|
|
930 |
{
|
|
|
931 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
932 |
png_read_push_finish_row(png_ptr);
|
|
|
933 |
}
|
|
|
934 |
}
|
|
|
935 |
|
|
|
936 |
if (png_ptr->pass == 4 && png_ptr->height <= 4)
|
|
|
937 |
{
|
|
|
938 |
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
|
|
|
939 |
{
|
|
|
940 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
941 |
png_read_push_finish_row(png_ptr);
|
|
|
942 |
}
|
|
|
943 |
}
|
|
|
944 |
|
|
|
945 |
if (png_ptr->pass == 6 && png_ptr->height <= 4)
|
|
|
946 |
{
|
|
|
947 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
948 |
png_read_push_finish_row(png_ptr);
|
|
|
949 |
}
|
|
|
950 |
|
|
|
951 |
break;
|
|
|
952 |
}
|
|
|
953 |
|
|
|
954 |
case 1:
|
|
|
955 |
{
|
|
|
956 |
int i;
|
|
|
957 |
for (i = 0; i < 8 && png_ptr->pass == 1; i++)
|
|
|
958 |
{
|
|
|
959 |
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
|
|
|
960 |
png_read_push_finish_row(png_ptr);
|
|
|
961 |
}
|
|
|
962 |
|
|
|
963 |
if (png_ptr->pass == 2) /* Skip top 4 generated rows */
|
|
|
964 |
{
|
|
|
965 |
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
|
|
|
966 |
{
|
|
|
967 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
968 |
png_read_push_finish_row(png_ptr);
|
|
|
969 |
}
|
|
|
970 |
}
|
|
|
971 |
|
|
|
972 |
break;
|
|
|
973 |
}
|
|
|
974 |
|
|
|
975 |
case 2:
|
|
|
976 |
{
|
|
|
977 |
int i;
|
|
|
978 |
|
|
|
979 |
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
|
|
|
980 |
{
|
|
|
981 |
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
|
|
|
982 |
png_read_push_finish_row(png_ptr);
|
|
|
983 |
}
|
|
|
984 |
|
|
|
985 |
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
|
|
|
986 |
{
|
|
|
987 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
988 |
png_read_push_finish_row(png_ptr);
|
|
|
989 |
}
|
|
|
990 |
|
|
|
991 |
if (png_ptr->pass == 4) /* Pass 3 might be empty */
|
|
|
992 |
{
|
|
|
993 |
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
|
|
|
994 |
{
|
|
|
995 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
996 |
png_read_push_finish_row(png_ptr);
|
|
|
997 |
}
|
|
|
998 |
}
|
|
|
999 |
|
|
|
1000 |
break;
|
|
|
1001 |
}
|
|
|
1002 |
|
|
|
1003 |
case 3:
|
|
|
1004 |
{
|
|
|
1005 |
int i;
|
|
|
1006 |
|
|
|
1007 |
for (i = 0; i < 4 && png_ptr->pass == 3; i++)
|
|
|
1008 |
{
|
|
|
1009 |
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
|
|
|
1010 |
png_read_push_finish_row(png_ptr);
|
|
|
1011 |
}
|
|
|
1012 |
|
|
|
1013 |
if (png_ptr->pass == 4) /* Skip top two generated rows */
|
|
|
1014 |
{
|
|
|
1015 |
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
|
|
|
1016 |
{
|
|
|
1017 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
1018 |
png_read_push_finish_row(png_ptr);
|
|
|
1019 |
}
|
|
|
1020 |
}
|
|
|
1021 |
|
|
|
1022 |
break;
|
|
|
1023 |
}
|
|
|
1024 |
|
|
|
1025 |
case 4:
|
|
|
1026 |
{
|
|
|
1027 |
int i;
|
|
|
1028 |
|
|
|
1029 |
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
|
|
|
1030 |
{
|
|
|
1031 |
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
|
|
|
1032 |
png_read_push_finish_row(png_ptr);
|
|
|
1033 |
}
|
|
|
1034 |
|
|
|
1035 |
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
|
|
|
1036 |
{
|
|
|
1037 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
1038 |
png_read_push_finish_row(png_ptr);
|
|
|
1039 |
}
|
|
|
1040 |
|
|
|
1041 |
if (png_ptr->pass == 6) /* Pass 5 might be empty */
|
|
|
1042 |
{
|
|
|
1043 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
1044 |
png_read_push_finish_row(png_ptr);
|
|
|
1045 |
}
|
|
|
1046 |
|
|
|
1047 |
break;
|
|
|
1048 |
}
|
|
|
1049 |
|
|
|
1050 |
case 5:
|
|
|
1051 |
{
|
|
|
1052 |
int i;
|
|
|
1053 |
|
|
|
1054 |
for (i = 0; i < 2 && png_ptr->pass == 5; i++)
|
|
|
1055 |
{
|
|
|
1056 |
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
|
|
|
1057 |
png_read_push_finish_row(png_ptr);
|
|
|
1058 |
}
|
|
|
1059 |
|
|
|
1060 |
if (png_ptr->pass == 6) /* Skip top generated row */
|
|
|
1061 |
{
|
|
|
1062 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
1063 |
png_read_push_finish_row(png_ptr);
|
|
|
1064 |
}
|
|
|
1065 |
|
|
|
1066 |
break;
|
|
|
1067 |
}
|
|
|
1068 |
case 6:
|
|
|
1069 |
{
|
|
|
1070 |
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
|
|
|
1071 |
png_read_push_finish_row(png_ptr);
|
|
|
1072 |
|
|
|
1073 |
if (png_ptr->pass != 6)
|
|
|
1074 |
break;
|
|
|
1075 |
|
|
|
1076 |
png_push_have_row(png_ptr, png_bytep_NULL);
|
|
|
1077 |
png_read_push_finish_row(png_ptr);
|
|
|
1078 |
}
|
|
|
1079 |
}
|
|
|
1080 |
}
|
|
|
1081 |
else
|
|
|
1082 |
#endif
|
|
|
1083 |
{
|
|
|
1084 |
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
|
|
|
1085 |
png_read_push_finish_row(png_ptr);
|
|
|
1086 |
}
|
|
|
1087 |
}
|
|
|
1088 |
|
|
|
1089 |
void /* PRIVATE */
|
|
|
1090 |
png_read_push_finish_row(png_structp png_ptr)
|
|
|
1091 |
{
|
|
|
1092 |
#ifdef PNG_USE_LOCAL_ARRAYS
|
|
|
1093 |
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
|
|
|
1094 |
|
|
|
1095 |
/* Start of interlace block */
|
|
|
1096 |
PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
|
|
|
1097 |
|
|
|
1098 |
/* Offset to next interlace block */
|
|
|
1099 |
PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
|
|
|
1100 |
|
|
|
1101 |
/* Start of interlace block in the y direction */
|
|
|
1102 |
PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
|
|
|
1103 |
|
|
|
1104 |
/* Offset to next interlace block in the y direction */
|
|
|
1105 |
PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
|
|
|
1106 |
|
|
|
1107 |
/* Height of interlace block. This is not currently used - if you need
|
|
|
1108 |
* it, uncomment it here and in png.h
|
|
|
1109 |
PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
|
|
|
1110 |
*/
|
|
|
1111 |
#endif
|
|
|
1112 |
|
|
|
1113 |
png_ptr->row_number++;
|
|
|
1114 |
if (png_ptr->row_number < png_ptr->num_rows)
|
|
|
1115 |
return;
|
|
|
1116 |
|
|
|
1117 |
#if defined(PNG_READ_INTERLACING_SUPPORTED)
|
|
|
1118 |
if (png_ptr->interlaced)
|
|
|
1119 |
{
|
|
|
1120 |
png_ptr->row_number = 0;
|
|
|
1121 |
png_memset_check(png_ptr, png_ptr->prev_row, 0,
|
|
|
1122 |
png_ptr->rowbytes + 1);
|
|
|
1123 |
do
|
|
|
1124 |
{
|
|
|
1125 |
png_ptr->pass++;
|
|
|
1126 |
if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
|
|
|
1127 |
(png_ptr->pass == 3 && png_ptr->width < 3) ||
|
|
|
1128 |
(png_ptr->pass == 5 && png_ptr->width < 2))
|
|
|
1129 |
png_ptr->pass++;
|
|
|
1130 |
|
|
|
1131 |
if (png_ptr->pass > 7)
|
|
|
1132 |
png_ptr->pass--;
|
|
|
1133 |
|
|
|
1134 |
if (png_ptr->pass >= 7)
|
|
|
1135 |
break;
|
|
|
1136 |
|
|
|
1137 |
png_ptr->iwidth = (png_ptr->width +
|
|
|
1138 |
png_pass_inc[png_ptr->pass] - 1 -
|
|
|
1139 |
png_pass_start[png_ptr->pass]) /
|
|
|
1140 |
png_pass_inc[png_ptr->pass];
|
|
|
1141 |
|
|
|
1142 |
png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
|
|
|
1143 |
png_ptr->iwidth) + 1;
|
|
|
1144 |
|
|
|
1145 |
if (png_ptr->transformations & PNG_INTERLACE)
|
|
|
1146 |
break;
|
|
|
1147 |
|
|
|
1148 |
png_ptr->num_rows = (png_ptr->height +
|
|
|
1149 |
png_pass_yinc[png_ptr->pass] - 1 -
|
|
|
1150 |
png_pass_ystart[png_ptr->pass]) /
|
|
|
1151 |
png_pass_yinc[png_ptr->pass];
|
|
|
1152 |
|
|
|
1153 |
} while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
|
|
|
1154 |
}
|
|
|
1155 |
#endif /* PNG_READ_INTERLACING_SUPPORTED */
|
|
|
1156 |
}
|
|
|
1157 |
|
|
|
1158 |
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
|
1159 |
void /* PRIVATE */
|
|
|
1160 |
png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
|
|
|
1161 |
length)
|
|
|
1162 |
{
|
|
|
1163 |
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
|
|
|
1164 |
{
|
|
|
1165 |
png_error(png_ptr, "Out of place tEXt");
|
|
|
1166 |
info_ptr = info_ptr; /* To quiet some compiler warnings */
|
|
|
1167 |
}
|
|
|
1168 |
|
|
|
1169 |
#ifdef PNG_MAX_MALLOC_64K
|
|
|
1170 |
png_ptr->skip_length = 0; /* This may not be necessary */
|
|
|
1171 |
|
|
|
1172 |
if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
|
|
|
1173 |
{
|
|
|
1174 |
png_warning(png_ptr, "tEXt chunk too large to fit in memory");
|
|
|
1175 |
png_ptr->skip_length = length - (png_uint_32)65535L;
|
|
|
1176 |
length = (png_uint_32)65535L;
|
|
|
1177 |
}
|
|
|
1178 |
#endif
|
|
|
1179 |
|
|
|
1180 |
png_ptr->current_text = (png_charp)png_malloc(png_ptr,
|
|
|
1181 |
(png_uint_32)(length + 1));
|
|
|
1182 |
png_ptr->current_text[length] = '\0';
|
|
|
1183 |
png_ptr->current_text_ptr = png_ptr->current_text;
|
|
|
1184 |
png_ptr->current_text_size = (png_size_t)length;
|
|
|
1185 |
png_ptr->current_text_left = (png_size_t)length;
|
|
|
1186 |
png_ptr->process_mode = PNG_READ_tEXt_MODE;
|
|
|
1187 |
}
|
|
|
1188 |
|
|
|
1189 |
void /* PRIVATE */
|
|
|
1190 |
png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
|
|
|
1191 |
{
|
|
|
1192 |
if (png_ptr->buffer_size && png_ptr->current_text_left)
|
|
|
1193 |
{
|
|
|
1194 |
png_size_t text_size;
|
|
|
1195 |
|
|
|
1196 |
if (png_ptr->buffer_size < png_ptr->current_text_left)
|
|
|
1197 |
text_size = png_ptr->buffer_size;
|
|
|
1198 |
|
|
|
1199 |
else
|
|
|
1200 |
text_size = png_ptr->current_text_left;
|
|
|
1201 |
|
|
|
1202 |
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
|
|
|
1203 |
png_ptr->current_text_left -= text_size;
|
|
|
1204 |
png_ptr->current_text_ptr += text_size;
|
|
|
1205 |
}
|
|
|
1206 |
if (!(png_ptr->current_text_left))
|
|
|
1207 |
{
|
|
|
1208 |
png_textp text_ptr;
|
|
|
1209 |
png_charp text;
|
|
|
1210 |
png_charp key;
|
|
|
1211 |
int ret;
|
|
|
1212 |
|
|
|
1213 |
if (png_ptr->buffer_size < 4)
|
|
|
1214 |
{
|
|
|
1215 |
png_push_save_buffer(png_ptr);
|
|
|
1216 |
return;
|
|
|
1217 |
}
|
|
|
1218 |
|
|
|
1219 |
png_push_crc_finish(png_ptr);
|
|
|
1220 |
|
|
|
1221 |
#if defined(PNG_MAX_MALLOC_64K)
|
|
|
1222 |
if (png_ptr->skip_length)
|
|
|
1223 |
return;
|
|
|
1224 |
#endif
|
|
|
1225 |
|
|
|
1226 |
key = png_ptr->current_text;
|
|
|
1227 |
|
|
|
1228 |
for (text = key; *text; text++)
|
|
|
1229 |
/* Empty loop */ ;
|
|
|
1230 |
|
|
|
1231 |
if (text < key + png_ptr->current_text_size)
|
|
|
1232 |
text++;
|
|
|
1233 |
|
|
|
1234 |
text_ptr = (png_textp)png_malloc(png_ptr,
|
|
|
1235 |
(png_uint_32)png_sizeof(png_text));
|
|
|
1236 |
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
|
|
|
1237 |
text_ptr->key = key;
|
|
|
1238 |
#ifdef PNG_iTXt_SUPPORTED
|
|
|
1239 |
text_ptr->lang = NULL;
|
|
|
1240 |
text_ptr->lang_key = NULL;
|
|
|
1241 |
#endif
|
|
|
1242 |
text_ptr->text = text;
|
|
|
1243 |
|
|
|
1244 |
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
|
|
|
1245 |
|
|
|
1246 |
png_free(png_ptr, key);
|
|
|
1247 |
png_free(png_ptr, text_ptr);
|
|
|
1248 |
png_ptr->current_text = NULL;
|
|
|
1249 |
|
|
|
1250 |
if (ret)
|
|
|
1251 |
png_warning(png_ptr, "Insufficient memory to store text chunk.");
|
|
|
1252 |
}
|
|
|
1253 |
}
|
|
|
1254 |
#endif
|
|
|
1255 |
|
|
|
1256 |
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
|
1257 |
void /* PRIVATE */
|
|
|
1258 |
png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
|
|
|
1259 |
length)
|
|
|
1260 |
{
|
|
|
1261 |
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
|
|
|
1262 |
{
|
|
|
1263 |
png_error(png_ptr, "Out of place zTXt");
|
|
|
1264 |
info_ptr = info_ptr; /* To quiet some compiler warnings */
|
|
|
1265 |
}
|
|
|
1266 |
|
|
|
1267 |
#ifdef PNG_MAX_MALLOC_64K
|
|
|
1268 |
/* We can't handle zTXt chunks > 64K, since we don't have enough space
|
|
|
1269 |
* to be able to store the uncompressed data. Actually, the threshold
|
|
|
1270 |
* is probably around 32K, but it isn't as definite as 64K is.
|
|
|
1271 |
*/
|
|
|
1272 |
if (length > (png_uint_32)65535L)
|
|
|
1273 |
{
|
|
|
1274 |
png_warning(png_ptr, "zTXt chunk too large to fit in memory");
|
|
|
1275 |
png_push_crc_skip(png_ptr, length);
|
|
|
1276 |
return;
|
|
|
1277 |
}
|
|
|
1278 |
#endif
|
|
|
1279 |
|
|
|
1280 |
png_ptr->current_text = (png_charp)png_malloc(png_ptr,
|
|
|
1281 |
(png_uint_32)(length + 1));
|
|
|
1282 |
png_ptr->current_text[length] = '\0';
|
|
|
1283 |
png_ptr->current_text_ptr = png_ptr->current_text;
|
|
|
1284 |
png_ptr->current_text_size = (png_size_t)length;
|
|
|
1285 |
png_ptr->current_text_left = (png_size_t)length;
|
|
|
1286 |
png_ptr->process_mode = PNG_READ_zTXt_MODE;
|
|
|
1287 |
}
|
|
|
1288 |
|
|
|
1289 |
void /* PRIVATE */
|
|
|
1290 |
png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
|
|
|
1291 |
{
|
|
|
1292 |
if (png_ptr->buffer_size && png_ptr->current_text_left)
|
|
|
1293 |
{
|
|
|
1294 |
png_size_t text_size;
|
|
|
1295 |
|
|
|
1296 |
if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
|
|
|
1297 |
text_size = png_ptr->buffer_size;
|
|
|
1298 |
|
|
|
1299 |
else
|
|
|
1300 |
text_size = png_ptr->current_text_left;
|
|
|
1301 |
|
|
|
1302 |
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
|
|
|
1303 |
png_ptr->current_text_left -= text_size;
|
|
|
1304 |
png_ptr->current_text_ptr += text_size;
|
|
|
1305 |
}
|
|
|
1306 |
if (!(png_ptr->current_text_left))
|
|
|
1307 |
{
|
|
|
1308 |
png_textp text_ptr;
|
|
|
1309 |
png_charp text;
|
|
|
1310 |
png_charp key;
|
|
|
1311 |
int ret;
|
|
|
1312 |
png_size_t text_size, key_size;
|
|
|
1313 |
|
|
|
1314 |
if (png_ptr->buffer_size < 4)
|
|
|
1315 |
{
|
|
|
1316 |
png_push_save_buffer(png_ptr);
|
|
|
1317 |
return;
|
|
|
1318 |
}
|
|
|
1319 |
|
|
|
1320 |
png_push_crc_finish(png_ptr);
|
|
|
1321 |
|
|
|
1322 |
key = png_ptr->current_text;
|
|
|
1323 |
|
|
|
1324 |
for (text = key; *text; text++)
|
|
|
1325 |
/* Empty loop */ ;
|
|
|
1326 |
|
|
|
1327 |
/* zTXt can't have zero text */
|
|
|
1328 |
if (text >= key + png_ptr->current_text_size)
|
|
|
1329 |
{
|
|
|
1330 |
png_ptr->current_text = NULL;
|
|
|
1331 |
png_free(png_ptr, key);
|
|
|
1332 |
return;
|
|
|
1333 |
}
|
|
|
1334 |
|
|
|
1335 |
text++;
|
|
|
1336 |
|
|
|
1337 |
if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */
|
|
|
1338 |
{
|
|
|
1339 |
png_ptr->current_text = NULL;
|
|
|
1340 |
png_free(png_ptr, key);
|
|
|
1341 |
return;
|
|
|
1342 |
}
|
|
|
1343 |
|
|
|
1344 |
text++;
|
|
|
1345 |
|
|
|
1346 |
png_ptr->zstream.next_in = (png_bytep )text;
|
|
|
1347 |
png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
|
|
|
1348 |
(text - key));
|
|
|
1349 |
png_ptr->zstream.next_out = png_ptr->zbuf;
|
|
|
1350 |
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
|
|
|
1351 |
|
|
|
1352 |
key_size = text - key;
|
|
|
1353 |
text_size = 0;
|
|
|
1354 |
text = NULL;
|
|
|
1355 |
ret = Z_STREAM_END;
|
|
|
1356 |
|
|
|
1357 |
while (png_ptr->zstream.avail_in)
|
|
|
1358 |
{
|
|
|
1359 |
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
|
|
|
1360 |
if (ret != Z_OK && ret != Z_STREAM_END)
|
|
|
1361 |
{
|
|
|
1362 |
inflateReset(&png_ptr->zstream);
|
|
|
1363 |
png_ptr->zstream.avail_in = 0;
|
|
|
1364 |
png_ptr->current_text = NULL;
|
|
|
1365 |
png_free(png_ptr, key);
|
|
|
1366 |
png_free(png_ptr, text);
|
|
|
1367 |
return;
|
|
|
1368 |
}
|
|
|
1369 |
if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END)
|
|
|
1370 |
{
|
|
|
1371 |
if (text == NULL)
|
|
|
1372 |
{
|
|
|
1373 |
text = (png_charp)png_malloc(png_ptr,
|
|
|
1374 |
(png_uint_32)(png_ptr->zbuf_size
|
|
|
1375 |
- png_ptr->zstream.avail_out + key_size + 1));
|
|
|
1376 |
|
|
|
1377 |
png_memcpy(text + key_size, png_ptr->zbuf,
|
|
|
1378 |
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
|
|
|
1379 |
|
|
|
1380 |
png_memcpy(text, key, key_size);
|
|
|
1381 |
|
|
|
1382 |
text_size = key_size + png_ptr->zbuf_size -
|
|
|
1383 |
png_ptr->zstream.avail_out;
|
|
|
1384 |
|
|
|
1385 |
*(text + text_size) = '\0';
|
|
|
1386 |
}
|
|
|
1387 |
else
|
|
|
1388 |
{
|
|
|
1389 |
png_charp tmp;
|
|
|
1390 |
|
|
|
1391 |
tmp = text;
|
|
|
1392 |
text = (png_charp)png_malloc(png_ptr, text_size +
|
|
|
1393 |
(png_uint_32)(png_ptr->zbuf_size
|
|
|
1394 |
- png_ptr->zstream.avail_out + 1));
|
|
|
1395 |
|
|
|
1396 |
png_memcpy(text, tmp, text_size);
|
|
|
1397 |
png_free(png_ptr, tmp);
|
|
|
1398 |
|
|
|
1399 |
png_memcpy(text + text_size, png_ptr->zbuf,
|
|
|
1400 |
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
|
|
|
1401 |
|
|
|
1402 |
text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
|
|
|
1403 |
*(text + text_size) = '\0';
|
|
|
1404 |
}
|
|
|
1405 |
if (ret != Z_STREAM_END)
|
|
|
1406 |
{
|
|
|
1407 |
png_ptr->zstream.next_out = png_ptr->zbuf;
|
|
|
1408 |
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
|
|
|
1409 |
}
|
|
|
1410 |
}
|
|
|
1411 |
else
|
|
|
1412 |
{
|
|
|
1413 |
break;
|
|
|
1414 |
}
|
|
|
1415 |
|
|
|
1416 |
if (ret == Z_STREAM_END)
|
|
|
1417 |
break;
|
|
|
1418 |
}
|
|
|
1419 |
|
|
|
1420 |
inflateReset(&png_ptr->zstream);
|
|
|
1421 |
png_ptr->zstream.avail_in = 0;
|
|
|
1422 |
|
|
|
1423 |
if (ret != Z_STREAM_END)
|
|
|
1424 |
{
|
|
|
1425 |
png_ptr->current_text = NULL;
|
|
|
1426 |
png_free(png_ptr, key);
|
|
|
1427 |
png_free(png_ptr, text);
|
|
|
1428 |
return;
|
|
|
1429 |
}
|
|
|
1430 |
|
|
|
1431 |
png_ptr->current_text = NULL;
|
|
|
1432 |
png_free(png_ptr, key);
|
|
|
1433 |
key = text;
|
|
|
1434 |
text += key_size;
|
|
|
1435 |
|
|
|
1436 |
text_ptr = (png_textp)png_malloc(png_ptr,
|
|
|
1437 |
(png_uint_32)png_sizeof(png_text));
|
|
|
1438 |
text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
|
|
|
1439 |
text_ptr->key = key;
|
|
|
1440 |
#ifdef PNG_iTXt_SUPPORTED
|
|
|
1441 |
text_ptr->lang = NULL;
|
|
|
1442 |
text_ptr->lang_key = NULL;
|
|
|
1443 |
#endif
|
|
|
1444 |
text_ptr->text = text;
|
|
|
1445 |
|
|
|
1446 |
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
|
|
|
1447 |
|
|
|
1448 |
png_free(png_ptr, key);
|
|
|
1449 |
png_free(png_ptr, text_ptr);
|
|
|
1450 |
|
|
|
1451 |
if (ret)
|
|
|
1452 |
png_warning(png_ptr, "Insufficient memory to store text chunk.");
|
|
|
1453 |
}
|
|
|
1454 |
}
|
|
|
1455 |
#endif
|
|
|
1456 |
|
|
|
1457 |
#if defined(PNG_READ_iTXt_SUPPORTED)
|
|
|
1458 |
void /* PRIVATE */
|
|
|
1459 |
png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
|
|
|
1460 |
length)
|
|
|
1461 |
{
|
|
|
1462 |
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
|
|
|
1463 |
{
|
|
|
1464 |
png_error(png_ptr, "Out of place iTXt");
|
|
|
1465 |
info_ptr = info_ptr; /* To quiet some compiler warnings */
|
|
|
1466 |
}
|
|
|
1467 |
|
|
|
1468 |
#ifdef PNG_MAX_MALLOC_64K
|
|
|
1469 |
png_ptr->skip_length = 0; /* This may not be necessary */
|
|
|
1470 |
|
|
|
1471 |
if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
|
|
|
1472 |
{
|
|
|
1473 |
png_warning(png_ptr, "iTXt chunk too large to fit in memory");
|
|
|
1474 |
png_ptr->skip_length = length - (png_uint_32)65535L;
|
|
|
1475 |
length = (png_uint_32)65535L;
|
|
|
1476 |
}
|
|
|
1477 |
#endif
|
|
|
1478 |
|
|
|
1479 |
png_ptr->current_text = (png_charp)png_malloc(png_ptr,
|
|
|
1480 |
(png_uint_32)(length + 1));
|
|
|
1481 |
png_ptr->current_text[length] = '\0';
|
|
|
1482 |
png_ptr->current_text_ptr = png_ptr->current_text;
|
|
|
1483 |
png_ptr->current_text_size = (png_size_t)length;
|
|
|
1484 |
png_ptr->current_text_left = (png_size_t)length;
|
|
|
1485 |
png_ptr->process_mode = PNG_READ_iTXt_MODE;
|
|
|
1486 |
}
|
|
|
1487 |
|
|
|
1488 |
void /* PRIVATE */
|
|
|
1489 |
png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
|
|
|
1490 |
{
|
|
|
1491 |
|
|
|
1492 |
if (png_ptr->buffer_size && png_ptr->current_text_left)
|
|
|
1493 |
{
|
|
|
1494 |
png_size_t text_size;
|
|
|
1495 |
|
|
|
1496 |
if (png_ptr->buffer_size < png_ptr->current_text_left)
|
|
|
1497 |
text_size = png_ptr->buffer_size;
|
|
|
1498 |
|
|
|
1499 |
else
|
|
|
1500 |
text_size = png_ptr->current_text_left;
|
|
|
1501 |
|
|
|
1502 |
png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
|
|
|
1503 |
png_ptr->current_text_left -= text_size;
|
|
|
1504 |
png_ptr->current_text_ptr += text_size;
|
|
|
1505 |
}
|
|
|
1506 |
if (!(png_ptr->current_text_left))
|
|
|
1507 |
{
|
|
|
1508 |
png_textp text_ptr;
|
|
|
1509 |
png_charp key;
|
|
|
1510 |
int comp_flag;
|
|
|
1511 |
png_charp lang;
|
|
|
1512 |
png_charp lang_key;
|
|
|
1513 |
png_charp text;
|
|
|
1514 |
int ret;
|
|
|
1515 |
|
|
|
1516 |
if (png_ptr->buffer_size < 4)
|
|
|
1517 |
{
|
|
|
1518 |
png_push_save_buffer(png_ptr);
|
|
|
1519 |
return;
|
|
|
1520 |
}
|
|
|
1521 |
|
|
|
1522 |
png_push_crc_finish(png_ptr);
|
|
|
1523 |
|
|
|
1524 |
#if defined(PNG_MAX_MALLOC_64K)
|
|
|
1525 |
if (png_ptr->skip_length)
|
|
|
1526 |
return;
|
|
|
1527 |
#endif
|
|
|
1528 |
|
|
|
1529 |
key = png_ptr->current_text;
|
|
|
1530 |
|
|
|
1531 |
for (lang = key; *lang; lang++)
|
|
|
1532 |
/* Empty loop */ ;
|
|
|
1533 |
|
|
|
1534 |
if (lang < key + png_ptr->current_text_size - 3)
|
|
|
1535 |
lang++;
|
|
|
1536 |
|
|
|
1537 |
comp_flag = *lang++;
|
|
|
1538 |
lang++; /* Skip comp_type, always zero */
|
|
|
1539 |
|
|
|
1540 |
for (lang_key = lang; *lang_key; lang_key++)
|
|
|
1541 |
/* Empty loop */ ;
|
|
|
1542 |
|
|
|
1543 |
lang_key++; /* Skip NUL separator */
|
|
|
1544 |
|
|
|
1545 |
text=lang_key;
|
|
|
1546 |
|
|
|
1547 |
if (lang_key < key + png_ptr->current_text_size - 1)
|
|
|
1548 |
{
|
|
|
1549 |
for (; *text; text++)
|
|
|
1550 |
/* Empty loop */ ;
|
|
|
1551 |
}
|
|
|
1552 |
|
|
|
1553 |
if (text < key + png_ptr->current_text_size)
|
|
|
1554 |
text++;
|
|
|
1555 |
|
|
|
1556 |
text_ptr = (png_textp)png_malloc(png_ptr,
|
|
|
1557 |
(png_uint_32)png_sizeof(png_text));
|
|
|
1558 |
|
|
|
1559 |
text_ptr->compression = comp_flag + 2;
|
|
|
1560 |
text_ptr->key = key;
|
|
|
1561 |
text_ptr->lang = lang;
|
|
|
1562 |
text_ptr->lang_key = lang_key;
|
|
|
1563 |
text_ptr->text = text;
|
|
|
1564 |
text_ptr->text_length = 0;
|
|
|
1565 |
text_ptr->itxt_length = png_strlen(text);
|
|
|
1566 |
|
|
|
1567 |
ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
|
|
|
1568 |
|
|
|
1569 |
png_ptr->current_text = NULL;
|
|
|
1570 |
|
|
|
1571 |
png_free(png_ptr, text_ptr);
|
|
|
1572 |
if (ret)
|
|
|
1573 |
png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
|
|
|
1574 |
}
|
|
|
1575 |
}
|
|
|
1576 |
#endif
|
|
|
1577 |
|
|
|
1578 |
/* This function is called when we haven't found a handler for this
|
|
|
1579 |
* chunk. If there isn't a problem with the chunk itself (ie a bad chunk
|
|
|
1580 |
* name or a critical chunk), the chunk is (currently) silently ignored.
|
|
|
1581 |
*/
|
|
|
1582 |
void /* PRIVATE */
|
|
|
1583 |
png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
|
|
|
1584 |
length)
|
|
|
1585 |
{
|
|
|
1586 |
png_uint_32 skip = 0;
|
|
|
1587 |
|
|
|
1588 |
if (!(png_ptr->chunk_name[0] & 0x20))
|
|
|
1589 |
{
|
|
|
1590 |
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
|
|
|
1591 |
if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
|
|
|
1592 |
PNG_HANDLE_CHUNK_ALWAYS
|
|
|
1593 |
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
|
|
|
1594 |
&& png_ptr->read_user_chunk_fn == NULL
|
|
|
1595 |
#endif
|
|
|
1596 |
)
|
|
|
1597 |
#endif
|
|
|
1598 |
png_chunk_error(png_ptr, "unknown critical chunk");
|
|
|
1599 |
|
|
|
1600 |
info_ptr = info_ptr; /* To quiet some compiler warnings */
|
|
|
1601 |
}
|
|
|
1602 |
|
|
|
1603 |
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
|
|
|
1604 |
if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
|
|
|
1605 |
{
|
|
|
1606 |
#ifdef PNG_MAX_MALLOC_64K
|
|
|
1607 |
if (length > (png_uint_32)65535L)
|
|
|
1608 |
{
|
|
|
1609 |
png_warning(png_ptr, "unknown chunk too large to fit in memory");
|
|
|
1610 |
skip = length - (png_uint_32)65535L;
|
|
|
1611 |
length = (png_uint_32)65535L;
|
|
|
1612 |
}
|
|
|
1613 |
#endif
|
|
|
1614 |
png_memcpy((png_charp)png_ptr->unknown_chunk.name,
|
|
|
1615 |
(png_charp)png_ptr->chunk_name,
|
|
|
1616 |
png_sizeof(png_ptr->unknown_chunk.name));
|
|
|
1617 |
png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1]
|
|
|
1618 |
= '\0';
|
|
|
1619 |
|
|
|
1620 |
png_ptr->unknown_chunk.size = (png_size_t)length;
|
|
|
1621 |
|
|
|
1622 |
if (length == 0)
|
|
|
1623 |
png_ptr->unknown_chunk.data = NULL;
|
|
|
1624 |
|
|
|
1625 |
else
|
|
|
1626 |
{
|
|
|
1627 |
png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr,
|
|
|
1628 |
(png_uint_32)length);
|
|
|
1629 |
png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
|
|
|
1630 |
}
|
|
|
1631 |
|
|
|
1632 |
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
|
|
|
1633 |
if (png_ptr->read_user_chunk_fn != NULL)
|
|
|
1634 |
{
|
|
|
1635 |
/* Callback to user unknown chunk handler */
|
|
|
1636 |
int ret;
|
|
|
1637 |
ret = (*(png_ptr->read_user_chunk_fn))
|
|
|
1638 |
(png_ptr, &png_ptr->unknown_chunk);
|
|
|
1639 |
|
|
|
1640 |
if (ret < 0)
|
|
|
1641 |
png_chunk_error(png_ptr, "error in user chunk");
|
|
|
1642 |
|
|
|
1643 |
if (ret == 0)
|
|
|
1644 |
{
|
|
|
1645 |
if (!(png_ptr->chunk_name[0] & 0x20))
|
|
|
1646 |
if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
|
|
|
1647 |
PNG_HANDLE_CHUNK_ALWAYS)
|
|
|
1648 |
png_chunk_error(png_ptr, "unknown critical chunk");
|
|
|
1649 |
png_set_unknown_chunks(png_ptr, info_ptr,
|
|
|
1650 |
&png_ptr->unknown_chunk, 1);
|
|
|
1651 |
}
|
|
|
1652 |
}
|
|
|
1653 |
|
|
|
1654 |
else
|
|
|
1655 |
#endif
|
|
|
1656 |
png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
|
|
|
1657 |
png_free(png_ptr, png_ptr->unknown_chunk.data);
|
|
|
1658 |
png_ptr->unknown_chunk.data = NULL;
|
|
|
1659 |
}
|
|
|
1660 |
|
|
|
1661 |
else
|
|
|
1662 |
#endif
|
|
|
1663 |
skip=length;
|
|
|
1664 |
png_push_crc_skip(png_ptr, skip);
|
|
|
1665 |
}
|
|
|
1666 |
|
|
|
1667 |
void /* PRIVATE */
|
|
|
1668 |
png_push_have_info(png_structp png_ptr, png_infop info_ptr)
|
|
|
1669 |
{
|
|
|
1670 |
if (png_ptr->info_fn != NULL)
|
|
|
1671 |
(*(png_ptr->info_fn))(png_ptr, info_ptr);
|
|
|
1672 |
}
|
|
|
1673 |
|
|
|
1674 |
void /* PRIVATE */
|
|
|
1675 |
png_push_have_end(png_structp png_ptr, png_infop info_ptr)
|
|
|
1676 |
{
|
|
|
1677 |
if (png_ptr->end_fn != NULL)
|
|
|
1678 |
(*(png_ptr->end_fn))(png_ptr, info_ptr);
|
|
|
1679 |
}
|
|
|
1680 |
|
|
|
1681 |
void /* PRIVATE */
|
|
|
1682 |
png_push_have_row(png_structp png_ptr, png_bytep row)
|
|
|
1683 |
{
|
|
|
1684 |
if (png_ptr->row_fn != NULL)
|
|
|
1685 |
(*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
|
|
|
1686 |
(int)png_ptr->pass);
|
|
|
1687 |
}
|
|
|
1688 |
|
|
|
1689 |
void PNGAPI
|
|
|
1690 |
png_progressive_combine_row (png_structp png_ptr,
|
|
|
1691 |
png_bytep old_row, png_bytep new_row)
|
|
|
1692 |
{
|
|
|
1693 |
#ifdef PNG_USE_LOCAL_ARRAYS
|
|
|
1694 |
PNG_CONST int FARDATA png_pass_dsp_mask[7] =
|
|
|
1695 |
{0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
|
|
|
1696 |
#endif
|
|
|
1697 |
if (png_ptr == NULL)
|
|
|
1698 |
return;
|
|
|
1699 |
|
|
|
1700 |
if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */
|
|
|
1701 |
png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
|
|
|
1702 |
}
|
|
|
1703 |
|
|
|
1704 |
void PNGAPI
|
|
|
1705 |
png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
|
|
|
1706 |
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
|
|
|
1707 |
png_progressive_end_ptr end_fn)
|
|
|
1708 |
{
|
|
|
1709 |
if (png_ptr == NULL)
|
|
|
1710 |
return;
|
|
|
1711 |
|
|
|
1712 |
png_ptr->info_fn = info_fn;
|
|
|
1713 |
png_ptr->row_fn = row_fn;
|
|
|
1714 |
png_ptr->end_fn = end_fn;
|
|
|
1715 |
|
|
|
1716 |
png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
|
|
|
1717 |
}
|
|
|
1718 |
|
|
|
1719 |
png_voidp PNGAPI
|
|
|
1720 |
png_get_progressive_ptr(png_structp png_ptr)
|
|
|
1721 |
{
|
|
|
1722 |
if (png_ptr == NULL)
|
|
|
1723 |
return (NULL);
|
|
|
1724 |
|
|
|
1725 |
return png_ptr->io_ptr;
|
|
|
1726 |
}
|
|
|
1727 |
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|