nuclear@14: 
nuclear@14: /* pngpread.c - read a png file in push mode
nuclear@14:  *
nuclear@14:  * Last changed in libpng 1.2.32 [September 18, 2008]
nuclear@14:  * For conditions of distribution and use, see copyright notice in png.h
nuclear@14:  * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@14:  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@14:  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@14:  */
nuclear@14: 
nuclear@14: #define PNG_INTERNAL
nuclear@14: #include "png.h"
nuclear@14: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@14: 
nuclear@14: /* push model modes */
nuclear@14: #define PNG_READ_SIG_MODE   0
nuclear@14: #define PNG_READ_CHUNK_MODE 1
nuclear@14: #define PNG_READ_IDAT_MODE  2
nuclear@14: #define PNG_SKIP_MODE       3
nuclear@14: #define PNG_READ_tEXt_MODE  4
nuclear@14: #define PNG_READ_zTXt_MODE  5
nuclear@14: #define PNG_READ_DONE_MODE  6
nuclear@14: #define PNG_READ_iTXt_MODE  7
nuclear@14: #define PNG_ERROR_MODE      8
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_process_data(png_structp png_ptr, png_infop info_ptr,
nuclear@14:    png_bytep buffer, png_size_t buffer_size)
nuclear@14: {
nuclear@14:    if (png_ptr == NULL || info_ptr == NULL) return;
nuclear@14:    png_push_restore_buffer(png_ptr, buffer, buffer_size);
nuclear@14: 
nuclear@14:    while (png_ptr->buffer_size)
nuclear@14:    {
nuclear@14:       png_process_some_data(png_ptr, info_ptr);
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: /* What we do with the incoming data depends on what we were previously
nuclear@14:  * doing before we ran out of data...
nuclear@14:  */
nuclear@14: void /* PRIVATE */
nuclear@14: png_process_some_data(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14:    if (png_ptr == NULL) return;
nuclear@14:    switch (png_ptr->process_mode)
nuclear@14:    {
nuclear@14:       case PNG_READ_SIG_MODE:
nuclear@14:       {
nuclear@14:          png_push_read_sig(png_ptr, info_ptr);
nuclear@14:          break;
nuclear@14:       }
nuclear@14:       case PNG_READ_CHUNK_MODE:
nuclear@14:       {
nuclear@14:          png_push_read_chunk(png_ptr, info_ptr);
nuclear@14:          break;
nuclear@14:       }
nuclear@14:       case PNG_READ_IDAT_MODE:
nuclear@14:       {
nuclear@14:          png_push_read_IDAT(png_ptr);
nuclear@14:          break;
nuclear@14:       }
nuclear@14: #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14:       case PNG_READ_tEXt_MODE:
nuclear@14:       {
nuclear@14:          png_push_read_tEXt(png_ptr, info_ptr);
nuclear@14:          break;
nuclear@14:       }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14:       case PNG_READ_zTXt_MODE:
nuclear@14:       {
nuclear@14:          png_push_read_zTXt(png_ptr, info_ptr);
nuclear@14:          break;
nuclear@14:       }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14:       case PNG_READ_iTXt_MODE:
nuclear@14:       {
nuclear@14:          png_push_read_iTXt(png_ptr, info_ptr);
nuclear@14:          break;
nuclear@14:       }
nuclear@14: #endif
nuclear@14:       case PNG_SKIP_MODE:
nuclear@14:       {
nuclear@14:          png_push_crc_finish(png_ptr);
nuclear@14:          break;
nuclear@14:       }
nuclear@14:       default:
nuclear@14:       {
nuclear@14:          png_ptr->buffer_size = 0;
nuclear@14:          break;
nuclear@14:       }
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: /* Read any remaining signature bytes from the stream and compare them with
nuclear@14:  * the correct PNG signature.  It is possible that this routine is called
nuclear@14:  * with bytes already read from the signature, either because they have been
nuclear@14:  * checked by the calling application, or because of multiple calls to this
nuclear@14:  * routine.
nuclear@14:  */
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14:    png_size_t num_checked = png_ptr->sig_bytes,
nuclear@14:              num_to_check = 8 - num_checked;
nuclear@14: 
nuclear@14:    if (png_ptr->buffer_size < num_to_check)
nuclear@14:    {
nuclear@14:       num_to_check = png_ptr->buffer_size;
nuclear@14:    }
nuclear@14: 
nuclear@14:    png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
nuclear@14:       num_to_check);
nuclear@14:    png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check);
nuclear@14: 
nuclear@14:    if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
nuclear@14:    {
nuclear@14:       if (num_checked < 4 &&
nuclear@14:           png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
nuclear@14:          png_error(png_ptr, "Not a PNG file");
nuclear@14:       else
nuclear@14:          png_error(png_ptr, "PNG file corrupted by ASCII conversion");
nuclear@14:    }
nuclear@14:    else
nuclear@14:    {
nuclear@14:       if (png_ptr->sig_bytes >= 8)
nuclear@14:       {
nuclear@14:          png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@14:       }
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14: #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14:       PNG_CONST PNG_IHDR;
nuclear@14:       PNG_CONST PNG_IDAT;
nuclear@14:       PNG_CONST PNG_IEND;
nuclear@14:       PNG_CONST PNG_PLTE;
nuclear@14: #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@14:       PNG_CONST PNG_bKGD;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@14:       PNG_CONST PNG_cHRM;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@14:       PNG_CONST PNG_gAMA;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14:       PNG_CONST PNG_hIST;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@14:       PNG_CONST PNG_iCCP;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14:       PNG_CONST PNG_iTXt;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@14:       PNG_CONST PNG_oFFs;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@14:       PNG_CONST PNG_pCAL;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@14:       PNG_CONST PNG_pHYs;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@14:       PNG_CONST PNG_sBIT;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@14:       PNG_CONST PNG_sCAL;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@14:       PNG_CONST PNG_sRGB;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@14:       PNG_CONST PNG_sPLT;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14:       PNG_CONST PNG_tEXt;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@14:       PNG_CONST PNG_tIME;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@14:       PNG_CONST PNG_tRNS;
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14:       PNG_CONST PNG_zTXt;
nuclear@14: #endif
nuclear@14: #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@14:    /* First we make sure we have enough data for the 4 byte chunk name
nuclear@14:     * and the 4 byte chunk length before proceeding with decoding the
nuclear@14:     * chunk data.  To fully decode each of these chunks, we also make
nuclear@14:     * sure we have enough data in the buffer for the 4 byte CRC at the
nuclear@14:     * end of every chunk (except IDAT, which is handled separately).
nuclear@14:     */
nuclear@14:    if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
nuclear@14:    {
nuclear@14:       png_byte chunk_length[4];
nuclear@14: 
nuclear@14:       if (png_ptr->buffer_size < 8)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_push_fill_buffer(png_ptr, chunk_length, 4);
nuclear@14:       png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
nuclear@14:       png_reset_crc(png_ptr);
nuclear@14:       png_crc_read(png_ptr, png_ptr->chunk_name, 4);
nuclear@14:       png_check_chunk_name(png_ptr, png_ptr->chunk_name);
nuclear@14:       png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
nuclear@14:    }
nuclear@14: 
nuclear@14:    if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14:      if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@14:         png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
nuclear@14: 
nuclear@14:    if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length != 13)
nuclear@14:          png_error(png_ptr, "Invalid IHDR length");
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14: 
nuclear@14:       png_ptr->process_mode = PNG_READ_DONE_MODE;
nuclear@14:       png_push_have_end(png_ptr, info_ptr);
nuclear@14:    }
nuclear@14: #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@14:    else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14:          png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@14:       png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:       if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
nuclear@14:          png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@14:       else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14:       {
nuclear@14:          if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@14:             png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@14:          else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@14:                   !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@14:             png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@14:       }
nuclear@14:    }
nuclear@14: #endif
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14:    {
nuclear@14:       /* If we reach an IDAT chunk, this means we have read all of the
nuclear@14:        * header chunks, and we can start reading the image (or if this
nuclear@14:        * is called after the image has been read - we have an error).
nuclear@14:        */
nuclear@14:      if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@14:        png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@14:      else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@14:          !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@14:        png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@14: 
nuclear@14:       if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@14:       {
nuclear@14:          if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@14:            if (png_ptr->push_length == 0)
nuclear@14:               return;
nuclear@14: 
nuclear@14:          if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@14:             png_error(png_ptr, "Too many IDAT's found");
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_ptr->idat_size = png_ptr->push_length;
nuclear@14:       png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@14:       png_ptr->process_mode = PNG_READ_IDAT_MODE;
nuclear@14:       png_push_have_info(png_ptr, info_ptr);
nuclear@14:       png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@14:       png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@14:       return;
nuclear@14:    }
nuclear@14: #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14:    else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: #endif
nuclear@14:    else
nuclear@14:    {
nuclear@14:       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:       png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14:    }
nuclear@14: 
nuclear@14:    png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
nuclear@14: {
nuclear@14:    png_ptr->process_mode = PNG_SKIP_MODE;
nuclear@14:    png_ptr->skip_length = skip;
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_crc_finish(png_structp png_ptr)
nuclear@14: {
nuclear@14:    if (png_ptr->skip_length && png_ptr->save_buffer_size)
nuclear@14:    {
nuclear@14:       png_size_t save_size;
nuclear@14: 
nuclear@14:       if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
nuclear@14:          save_size = (png_size_t)png_ptr->skip_length;
nuclear@14:       else
nuclear@14:          save_size = png_ptr->save_buffer_size;
nuclear@14: 
nuclear@14:       png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@14: 
nuclear@14:       png_ptr->skip_length -= save_size;
nuclear@14:       png_ptr->buffer_size -= save_size;
nuclear@14:       png_ptr->save_buffer_size -= save_size;
nuclear@14:       png_ptr->save_buffer_ptr += save_size;
nuclear@14:    }
nuclear@14:    if (png_ptr->skip_length && png_ptr->current_buffer_size)
nuclear@14:    {
nuclear@14:       png_size_t save_size;
nuclear@14: 
nuclear@14:       if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
nuclear@14:          save_size = (png_size_t)png_ptr->skip_length;
nuclear@14:       else
nuclear@14:          save_size = png_ptr->current_buffer_size;
nuclear@14: 
nuclear@14:       png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@14: 
nuclear@14:       png_ptr->skip_length -= save_size;
nuclear@14:       png_ptr->buffer_size -= save_size;
nuclear@14:       png_ptr->current_buffer_size -= save_size;
nuclear@14:       png_ptr->current_buffer_ptr += save_size;
nuclear@14:    }
nuclear@14:    if (!png_ptr->skip_length)
nuclear@14:    {
nuclear@14:       if (png_ptr->buffer_size < 4)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_crc_finish(png_ptr, 0);
nuclear@14:       png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
nuclear@14: {
nuclear@14:    png_bytep ptr;
nuclear@14: 
nuclear@14:    if (png_ptr == NULL) return;
nuclear@14:    ptr = buffer;
nuclear@14:    if (png_ptr->save_buffer_size)
nuclear@14:    {
nuclear@14:       png_size_t save_size;
nuclear@14: 
nuclear@14:       if (length < png_ptr->save_buffer_size)
nuclear@14:          save_size = length;
nuclear@14:       else
nuclear@14:          save_size = png_ptr->save_buffer_size;
nuclear@14: 
nuclear@14:       png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@14:       length -= save_size;
nuclear@14:       ptr += save_size;
nuclear@14:       png_ptr->buffer_size -= save_size;
nuclear@14:       png_ptr->save_buffer_size -= save_size;
nuclear@14:       png_ptr->save_buffer_ptr += save_size;
nuclear@14:    }
nuclear@14:    if (length && png_ptr->current_buffer_size)
nuclear@14:    {
nuclear@14:       png_size_t save_size;
nuclear@14: 
nuclear@14:       if (length < png_ptr->current_buffer_size)
nuclear@14:          save_size = length;
nuclear@14:       else
nuclear@14:          save_size = png_ptr->current_buffer_size;
nuclear@14: 
nuclear@14:       png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@14:       png_ptr->buffer_size -= save_size;
nuclear@14:       png_ptr->current_buffer_size -= save_size;
nuclear@14:       png_ptr->current_buffer_ptr += save_size;
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_save_buffer(png_structp png_ptr)
nuclear@14: {
nuclear@14:    if (png_ptr->save_buffer_size)
nuclear@14:    {
nuclear@14:       if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
nuclear@14:       {
nuclear@14:          png_size_t i, istop;
nuclear@14:          png_bytep sp;
nuclear@14:          png_bytep dp;
nuclear@14: 
nuclear@14:          istop = png_ptr->save_buffer_size;
nuclear@14:          for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
nuclear@14:             i < istop; i++, sp++, dp++)
nuclear@14:          {
nuclear@14:             *dp = *sp;
nuclear@14:          }
nuclear@14:       }
nuclear@14:    }
nuclear@14:    if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
nuclear@14:       png_ptr->save_buffer_max)
nuclear@14:    {
nuclear@14:       png_size_t new_max;
nuclear@14:       png_bytep old_buffer;
nuclear@14: 
nuclear@14:       if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
nuclear@14:          (png_ptr->current_buffer_size + 256))
nuclear@14:       {
nuclear@14:         png_error(png_ptr, "Potential overflow of save_buffer");
nuclear@14:       }
nuclear@14:       new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
nuclear@14:       old_buffer = png_ptr->save_buffer;
nuclear@14:       png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
nuclear@14:          (png_uint_32)new_max);
nuclear@14:       png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
nuclear@14:       png_free(png_ptr, old_buffer);
nuclear@14:       png_ptr->save_buffer_max = new_max;
nuclear@14:    }
nuclear@14:    if (png_ptr->current_buffer_size)
nuclear@14:    {
nuclear@14:       png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
nuclear@14:          png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
nuclear@14:       png_ptr->save_buffer_size += png_ptr->current_buffer_size;
nuclear@14:       png_ptr->current_buffer_size = 0;
nuclear@14:    }
nuclear@14:    png_ptr->save_buffer_ptr = png_ptr->save_buffer;
nuclear@14:    png_ptr->buffer_size = 0;
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
nuclear@14:    png_size_t buffer_length)
nuclear@14: {
nuclear@14:    png_ptr->current_buffer = buffer;
nuclear@14:    png_ptr->current_buffer_size = buffer_length;
nuclear@14:    png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
nuclear@14:    png_ptr->current_buffer_ptr = png_ptr->current_buffer;
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_read_IDAT(png_structp png_ptr)
nuclear@14: {
nuclear@14: #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14:    PNG_CONST PNG_IDAT;
nuclear@14: #endif
nuclear@14:    if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
nuclear@14:    {
nuclear@14:       png_byte chunk_length[4];
nuclear@14: 
nuclear@14:       if (png_ptr->buffer_size < 8)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_push_fill_buffer(png_ptr, chunk_length, 4);
nuclear@14:       png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
nuclear@14:       png_reset_crc(png_ptr);
nuclear@14:       png_crc_read(png_ptr, png_ptr->chunk_name, 4);
nuclear@14:       png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
nuclear@14: 
nuclear@14:       if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14:       {
nuclear@14:          png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@14:          if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@14:             png_error(png_ptr, "Not enough compressed data");
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_ptr->idat_size = png_ptr->push_length;
nuclear@14:    }
nuclear@14:    if (png_ptr->idat_size && png_ptr->save_buffer_size)
nuclear@14:    {
nuclear@14:       png_size_t save_size;
nuclear@14: 
nuclear@14:       if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
nuclear@14:       {
nuclear@14:          save_size = (png_size_t)png_ptr->idat_size;
nuclear@14:          /* check for overflow */
nuclear@14:          if ((png_uint_32)save_size != png_ptr->idat_size)
nuclear@14:             png_error(png_ptr, "save_size overflowed in pngpread");
nuclear@14:       }
nuclear@14:       else
nuclear@14:          save_size = png_ptr->save_buffer_size;
nuclear@14: 
nuclear@14:       png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@14:       if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@14:          png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@14:       png_ptr->idat_size -= save_size;
nuclear@14:       png_ptr->buffer_size -= save_size;
nuclear@14:       png_ptr->save_buffer_size -= save_size;
nuclear@14:       png_ptr->save_buffer_ptr += save_size;
nuclear@14:    }
nuclear@14:    if (png_ptr->idat_size && png_ptr->current_buffer_size)
nuclear@14:    {
nuclear@14:       png_size_t save_size;
nuclear@14: 
nuclear@14:       if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
nuclear@14:       {
nuclear@14:          save_size = (png_size_t)png_ptr->idat_size;
nuclear@14:          /* check for overflow */
nuclear@14:          if ((png_uint_32)save_size != png_ptr->idat_size)
nuclear@14:             png_error(png_ptr, "save_size overflowed in pngpread");
nuclear@14:       }
nuclear@14:       else
nuclear@14:          save_size = png_ptr->current_buffer_size;
nuclear@14: 
nuclear@14:       png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@14:       if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@14:         png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@14: 
nuclear@14:       png_ptr->idat_size -= save_size;
nuclear@14:       png_ptr->buffer_size -= save_size;
nuclear@14:       png_ptr->current_buffer_size -= save_size;
nuclear@14:       png_ptr->current_buffer_ptr += save_size;
nuclear@14:    }
nuclear@14:    if (!png_ptr->idat_size)
nuclear@14:    {
nuclear@14:       if (png_ptr->buffer_size < 4)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_crc_finish(png_ptr, 0);
nuclear@14:       png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
nuclear@14:       png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
nuclear@14:    png_size_t buffer_length)
nuclear@14: {
nuclear@14:    int ret;
nuclear@14: 
nuclear@14:    if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length)
nuclear@14:       png_error(png_ptr, "Extra compression data");
nuclear@14: 
nuclear@14:    png_ptr->zstream.next_in = buffer;
nuclear@14:    png_ptr->zstream.avail_in = (uInt)buffer_length;
nuclear@14:    for (;;)
nuclear@14:    {
nuclear@14:       ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@14:       if (ret != Z_OK)
nuclear@14:       {
nuclear@14:          if (ret == Z_STREAM_END)
nuclear@14:          {
nuclear@14:             if (png_ptr->zstream.avail_in)
nuclear@14:                png_error(png_ptr, "Extra compressed data");
nuclear@14:             if (!(png_ptr->zstream.avail_out))
nuclear@14:             {
nuclear@14:                png_push_process_row(png_ptr);
nuclear@14:             }
nuclear@14: 
nuclear@14:             png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@14:             png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@14:             break;
nuclear@14:          }
nuclear@14:          else if (ret == Z_BUF_ERROR)
nuclear@14:             break;
nuclear@14:          else
nuclear@14:             png_error(png_ptr, "Decompression Error");
nuclear@14:       }
nuclear@14:       if (!(png_ptr->zstream.avail_out))
nuclear@14:       {
nuclear@14:          if ((
nuclear@14: #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@14:              png_ptr->interlaced && png_ptr->pass > 6) ||
nuclear@14:              (!png_ptr->interlaced &&
nuclear@14: #endif
nuclear@14:              png_ptr->row_number == png_ptr->num_rows))
nuclear@14:          {
nuclear@14:            if (png_ptr->zstream.avail_in)
nuclear@14:              png_warning(png_ptr, "Too much data in IDAT chunks");
nuclear@14:            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@14:            break;
nuclear@14:          }
nuclear@14:          png_push_process_row(png_ptr);
nuclear@14:          png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@14:          png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@14:       }
nuclear@14:       else
nuclear@14:          break;
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_process_row(png_structp png_ptr)
nuclear@14: {
nuclear@14:    png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@14:    png_ptr->row_info.width = png_ptr->iwidth;
nuclear@14:    png_ptr->row_info.channels = png_ptr->channels;
nuclear@14:    png_ptr->row_info.bit_depth = png_ptr->bit_depth;
nuclear@14:    png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
nuclear@14: 
nuclear@14:    png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@14:        png_ptr->row_info.width);
nuclear@14: 
nuclear@14:    png_read_filter_row(png_ptr, &(png_ptr->row_info),
nuclear@14:       png_ptr->row_buf + 1, png_ptr->prev_row + 1,
nuclear@14:       (int)(png_ptr->row_buf[0]));
nuclear@14: 
nuclear@14:    png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
nuclear@14:       png_ptr->rowbytes + 1);
nuclear@14: 
nuclear@14:    if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
nuclear@14:       png_do_read_transformations(png_ptr);
nuclear@14: 
nuclear@14: #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@14:    /* blow up interlaced rows to full size */
nuclear@14:    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@14:    {
nuclear@14:       if (png_ptr->pass < 6)
nuclear@14: /*       old interface (pre-1.0.9):
nuclear@14:          png_do_read_interlace(&(png_ptr->row_info),
nuclear@14:             png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
nuclear@14:  */
nuclear@14:          png_do_read_interlace(png_ptr);
nuclear@14: 
nuclear@14:     switch (png_ptr->pass)
nuclear@14:     {
nuclear@14:          case 0:
nuclear@14:          {
nuclear@14:             int i;
nuclear@14:             for (i = 0; i < 8 && png_ptr->pass == 0; i++)
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14:                png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
nuclear@14:             }
nuclear@14:             if (png_ptr->pass == 2) /* pass 1 might be empty */
nuclear@14:             {
nuclear@14:                for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@14:                {
nuclear@14:                   png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                   png_read_push_finish_row(png_ptr);
nuclear@14:                }
nuclear@14:             }
nuclear@14:             if (png_ptr->pass == 4 && png_ptr->height <= 4)
nuclear@14:             {
nuclear@14:                for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14:                {
nuclear@14:                   png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                   png_read_push_finish_row(png_ptr);
nuclear@14:                }
nuclear@14:             }
nuclear@14:             if (png_ptr->pass == 6 && png_ptr->height <= 4)
nuclear@14:             {
nuclear@14:                 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                 png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          }
nuclear@14:          case 1:
nuclear@14:          {
nuclear@14:             int i;
nuclear@14:             for (i = 0; i < 8 && png_ptr->pass == 1; i++)
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             if (png_ptr->pass == 2) /* skip top 4 generated rows */
nuclear@14:             {
nuclear@14:                for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@14:                {
nuclear@14:                   png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                   png_read_push_finish_row(png_ptr);
nuclear@14:                }
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          }
nuclear@14:          case 2:
nuclear@14:          {
nuclear@14:             int i;
nuclear@14:             for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             if (png_ptr->pass == 4) /* pass 3 might be empty */
nuclear@14:             {
nuclear@14:                for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14:                {
nuclear@14:                   png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                   png_read_push_finish_row(png_ptr);
nuclear@14:                }
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          }
nuclear@14:          case 3:
nuclear@14:          {
nuclear@14:             int i;
nuclear@14:             for (i = 0; i < 4 && png_ptr->pass == 3; i++)
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             if (png_ptr->pass == 4) /* skip top two generated rows */
nuclear@14:             {
nuclear@14:                for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14:                {
nuclear@14:                   png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                   png_read_push_finish_row(png_ptr);
nuclear@14:                }
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          }
nuclear@14:          case 4:
nuclear@14:          {
nuclear@14:             int i;
nuclear@14:             for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             if (png_ptr->pass == 6) /* pass 5 might be empty */
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          }
nuclear@14:          case 5:
nuclear@14:          {
nuclear@14:             int i;
nuclear@14:             for (i = 0; i < 2 && png_ptr->pass == 5; i++)
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             if (png_ptr->pass == 6) /* skip top generated row */
nuclear@14:             {
nuclear@14:                png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:                png_read_push_finish_row(png_ptr);
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          }
nuclear@14:          case 6:
nuclear@14:          {
nuclear@14:             png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14:             png_read_push_finish_row(png_ptr);
nuclear@14:             if (png_ptr->pass != 6)
nuclear@14:                break;
nuclear@14:             png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14:             png_read_push_finish_row(png_ptr);
nuclear@14:          }
nuclear@14:       }
nuclear@14:    }
nuclear@14:    else
nuclear@14: #endif
nuclear@14:    {
nuclear@14:       png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14:       png_read_push_finish_row(png_ptr);
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_read_push_finish_row(png_structp png_ptr)
nuclear@14: {
nuclear@14: #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14:    /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
nuclear@14: 
nuclear@14:    /* start of interlace block */
nuclear@14:    PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
nuclear@14: 
nuclear@14:    /* offset to next interlace block */
nuclear@14:    PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
nuclear@14: 
nuclear@14:    /* start of interlace block in the y direction */
nuclear@14:    PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
nuclear@14: 
nuclear@14:    /* offset to next interlace block in the y direction */
nuclear@14:    PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
nuclear@14: 
nuclear@14:    /* Height of interlace block.  This is not currently used - if you need
nuclear@14:     * it, uncomment it here and in png.h
nuclear@14:    PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
nuclear@14:    */
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_ptr->row_number++;
nuclear@14:    if (png_ptr->row_number < png_ptr->num_rows)
nuclear@14:       return;
nuclear@14: 
nuclear@14:    if (png_ptr->interlaced)
nuclear@14:    {
nuclear@14:       png_ptr->row_number = 0;
nuclear@14:       png_memset_check(png_ptr, png_ptr->prev_row, 0,
nuclear@14:          png_ptr->rowbytes + 1);
nuclear@14:       do
nuclear@14:       {
nuclear@14:          png_ptr->pass++;
nuclear@14:          if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
nuclear@14:              (png_ptr->pass == 3 && png_ptr->width < 3) ||
nuclear@14:              (png_ptr->pass == 5 && png_ptr->width < 2))
nuclear@14:            png_ptr->pass++;
nuclear@14: 
nuclear@14:          if (png_ptr->pass > 7)
nuclear@14:             png_ptr->pass--;
nuclear@14:          if (png_ptr->pass >= 7)
nuclear@14:             break;
nuclear@14: 
nuclear@14:          png_ptr->iwidth = (png_ptr->width +
nuclear@14:             png_pass_inc[png_ptr->pass] - 1 -
nuclear@14:             png_pass_start[png_ptr->pass]) /
nuclear@14:             png_pass_inc[png_ptr->pass];
nuclear@14: 
nuclear@14:          png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
nuclear@14:             png_ptr->iwidth) + 1;
nuclear@14: 
nuclear@14:          if (png_ptr->transformations & PNG_INTERLACE)
nuclear@14:             break;
nuclear@14: 
nuclear@14:          png_ptr->num_rows = (png_ptr->height +
nuclear@14:             png_pass_yinc[png_ptr->pass] - 1 -
nuclear@14:             png_pass_ystart[png_ptr->pass]) /
nuclear@14:             png_pass_yinc[png_ptr->pass];
nuclear@14: 
nuclear@14:       } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@14:    length)
nuclear@14: {
nuclear@14:    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@14:       {
nuclear@14:          png_error(png_ptr, "Out of place tEXt");
nuclear@14:          info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@14:       }
nuclear@14: 
nuclear@14: #ifdef PNG_MAX_MALLOC_64K
nuclear@14:    png_ptr->skip_length = 0;  /* This may not be necessary */
nuclear@14: 
nuclear@14:    if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
nuclear@14:    {
nuclear@14:       png_warning(png_ptr, "tEXt chunk too large to fit in memory");
nuclear@14:       png_ptr->skip_length = length - (png_uint_32)65535L;
nuclear@14:       length = (png_uint_32)65535L;
nuclear@14:    }
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@14:       (png_uint_32)(length + 1));
nuclear@14:    png_ptr->current_text[length] = '\0';
nuclear@14:    png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@14:    png_ptr->current_text_size = (png_size_t)length;
nuclear@14:    png_ptr->current_text_left = (png_size_t)length;
nuclear@14:    png_ptr->process_mode = PNG_READ_tEXt_MODE;
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14:    if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@14:    {
nuclear@14:       png_size_t text_size;
nuclear@14: 
nuclear@14:       if (png_ptr->buffer_size < png_ptr->current_text_left)
nuclear@14:          text_size = png_ptr->buffer_size;
nuclear@14:       else
nuclear@14:          text_size = png_ptr->current_text_left;
nuclear@14:       png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@14:       png_ptr->current_text_left -= text_size;
nuclear@14:       png_ptr->current_text_ptr += text_size;
nuclear@14:    }
nuclear@14:    if (!(png_ptr->current_text_left))
nuclear@14:    {
nuclear@14:       png_textp text_ptr;
nuclear@14:       png_charp text;
nuclear@14:       png_charp key;
nuclear@14:       int ret;
nuclear@14: 
nuclear@14:       if (png_ptr->buffer_size < 4)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_push_crc_finish(png_ptr);
nuclear@14: 
nuclear@14: #if defined(PNG_MAX_MALLOC_64K)
nuclear@14:       if (png_ptr->skip_length)
nuclear@14:          return;
nuclear@14: #endif
nuclear@14: 
nuclear@14:       key = png_ptr->current_text;
nuclear@14: 
nuclear@14:       for (text = key; *text; text++)
nuclear@14:          /* empty loop */ ;
nuclear@14: 
nuclear@14:       if (text < key + png_ptr->current_text_size)
nuclear@14:          text++;
nuclear@14: 
nuclear@14:       text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@14:          (png_uint_32)png_sizeof(png_text));
nuclear@14:       text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
nuclear@14:       text_ptr->key = key;
nuclear@14: #ifdef PNG_iTXt_SUPPORTED
nuclear@14:       text_ptr->lang = NULL;
nuclear@14:       text_ptr->lang_key = NULL;
nuclear@14: #endif
nuclear@14:       text_ptr->text = text;
nuclear@14: 
nuclear@14:       ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@14: 
nuclear@14:       png_free(png_ptr, key);
nuclear@14:       png_free(png_ptr, text_ptr);
nuclear@14:       png_ptr->current_text = NULL;
nuclear@14: 
nuclear@14:       if (ret)
nuclear@14:         png_warning(png_ptr, "Insufficient memory to store text chunk.");
nuclear@14:    }
nuclear@14: }
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@14:    length)
nuclear@14: {
nuclear@14:    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@14:       {
nuclear@14:          png_error(png_ptr, "Out of place zTXt");
nuclear@14:          info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@14:       }
nuclear@14: 
nuclear@14: #ifdef PNG_MAX_MALLOC_64K
nuclear@14:    /* We can't handle zTXt chunks > 64K, since we don't have enough space
nuclear@14:     * to be able to store the uncompressed data.  Actually, the threshold
nuclear@14:     * is probably around 32K, but it isn't as definite as 64K is.
nuclear@14:     */
nuclear@14:    if (length > (png_uint_32)65535L)
nuclear@14:    {
nuclear@14:       png_warning(png_ptr, "zTXt chunk too large to fit in memory");
nuclear@14:       png_push_crc_skip(png_ptr, length);
nuclear@14:       return;
nuclear@14:    }
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@14:       (png_uint_32)(length + 1));
nuclear@14:    png_ptr->current_text[length] = '\0';
nuclear@14:    png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@14:    png_ptr->current_text_size = (png_size_t)length;
nuclear@14:    png_ptr->current_text_left = (png_size_t)length;
nuclear@14:    png_ptr->process_mode = PNG_READ_zTXt_MODE;
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14:    if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@14:    {
nuclear@14:       png_size_t text_size;
nuclear@14: 
nuclear@14:       if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
nuclear@14:          text_size = png_ptr->buffer_size;
nuclear@14:       else
nuclear@14:          text_size = png_ptr->current_text_left;
nuclear@14:       png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@14:       png_ptr->current_text_left -= text_size;
nuclear@14:       png_ptr->current_text_ptr += text_size;
nuclear@14:    }
nuclear@14:    if (!(png_ptr->current_text_left))
nuclear@14:    {
nuclear@14:       png_textp text_ptr;
nuclear@14:       png_charp text;
nuclear@14:       png_charp key;
nuclear@14:       int ret;
nuclear@14:       png_size_t text_size, key_size;
nuclear@14: 
nuclear@14:       if (png_ptr->buffer_size < 4)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_push_crc_finish(png_ptr);
nuclear@14: 
nuclear@14:       key = png_ptr->current_text;
nuclear@14: 
nuclear@14:       for (text = key; *text; text++)
nuclear@14:          /* empty loop */ ;
nuclear@14: 
nuclear@14:       /* zTXt can't have zero text */
nuclear@14:       if (text >= key + png_ptr->current_text_size)
nuclear@14:       {
nuclear@14:          png_ptr->current_text = NULL;
nuclear@14:          png_free(png_ptr, key);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       text++;
nuclear@14: 
nuclear@14:       if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
nuclear@14:       {
nuclear@14:          png_ptr->current_text = NULL;
nuclear@14:          png_free(png_ptr, key);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       text++;
nuclear@14: 
nuclear@14:       png_ptr->zstream.next_in = (png_bytep )text;
nuclear@14:       png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
nuclear@14:          (text - key));
nuclear@14:       png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@14:       png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@14: 
nuclear@14:       key_size = text - key;
nuclear@14:       text_size = 0;
nuclear@14:       text = NULL;
nuclear@14:       ret = Z_STREAM_END;
nuclear@14: 
nuclear@14:       while (png_ptr->zstream.avail_in)
nuclear@14:       {
nuclear@14:          ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@14:          if (ret != Z_OK && ret != Z_STREAM_END)
nuclear@14:          {
nuclear@14:             inflateReset(&png_ptr->zstream);
nuclear@14:             png_ptr->zstream.avail_in = 0;
nuclear@14:             png_ptr->current_text = NULL;
nuclear@14:             png_free(png_ptr, key);
nuclear@14:             png_free(png_ptr, text);
nuclear@14:             return;
nuclear@14:          }
nuclear@14:          if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END)
nuclear@14:          {
nuclear@14:             if (text == NULL)
nuclear@14:             {
nuclear@14:                text = (png_charp)png_malloc(png_ptr,
nuclear@14:                      (png_uint_32)(png_ptr->zbuf_size
nuclear@14:                      - png_ptr->zstream.avail_out + key_size + 1));
nuclear@14:                png_memcpy(text + key_size, png_ptr->zbuf,
nuclear@14:                   png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@14:                png_memcpy(text, key, key_size);
nuclear@14:                text_size = key_size + png_ptr->zbuf_size -
nuclear@14:                   png_ptr->zstream.avail_out;
nuclear@14:                *(text + text_size) = '\0';
nuclear@14:             }
nuclear@14:             else
nuclear@14:             {
nuclear@14:                png_charp tmp;
nuclear@14: 
nuclear@14:                tmp = text;
nuclear@14:                text = (png_charp)png_malloc(png_ptr, text_size +
nuclear@14:                   (png_uint_32)(png_ptr->zbuf_size 
nuclear@14:                   - png_ptr->zstream.avail_out + 1));
nuclear@14:                png_memcpy(text, tmp, text_size);
nuclear@14:                png_free(png_ptr, tmp);
nuclear@14:                png_memcpy(text + text_size, png_ptr->zbuf,
nuclear@14:                   png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@14:                text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
nuclear@14:                *(text + text_size) = '\0';
nuclear@14:             }
nuclear@14:             if (ret != Z_STREAM_END)
nuclear@14:             {
nuclear@14:                png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@14:                png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@14:             }
nuclear@14:          }
nuclear@14:          else
nuclear@14:          {
nuclear@14:             break;
nuclear@14:          }
nuclear@14: 
nuclear@14:          if (ret == Z_STREAM_END)
nuclear@14:             break;
nuclear@14:       }
nuclear@14: 
nuclear@14:       inflateReset(&png_ptr->zstream);
nuclear@14:       png_ptr->zstream.avail_in = 0;
nuclear@14: 
nuclear@14:       if (ret != Z_STREAM_END)
nuclear@14:       {
nuclear@14:          png_ptr->current_text = NULL;
nuclear@14:          png_free(png_ptr, key);
nuclear@14:          png_free(png_ptr, text);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_ptr->current_text = NULL;
nuclear@14:       png_free(png_ptr, key);
nuclear@14:       key = text;
nuclear@14:       text += key_size;
nuclear@14: 
nuclear@14:       text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@14:           (png_uint_32)png_sizeof(png_text));
nuclear@14:       text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
nuclear@14:       text_ptr->key = key;
nuclear@14: #ifdef PNG_iTXt_SUPPORTED
nuclear@14:       text_ptr->lang = NULL;
nuclear@14:       text_ptr->lang_key = NULL;
nuclear@14: #endif
nuclear@14:       text_ptr->text = text;
nuclear@14: 
nuclear@14:       ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@14: 
nuclear@14:       png_free(png_ptr, key);
nuclear@14:       png_free(png_ptr, text_ptr);
nuclear@14: 
nuclear@14:       if (ret)
nuclear@14:         png_warning(png_ptr, "Insufficient memory to store text chunk.");
nuclear@14:    }
nuclear@14: }
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@14:    length)
nuclear@14: {
nuclear@14:    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@14:       {
nuclear@14:          png_error(png_ptr, "Out of place iTXt");
nuclear@14:          info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@14:       }
nuclear@14: 
nuclear@14: #ifdef PNG_MAX_MALLOC_64K
nuclear@14:    png_ptr->skip_length = 0;  /* This may not be necessary */
nuclear@14: 
nuclear@14:    if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
nuclear@14:    {
nuclear@14:       png_warning(png_ptr, "iTXt chunk too large to fit in memory");
nuclear@14:       png_ptr->skip_length = length - (png_uint_32)65535L;
nuclear@14:       length = (png_uint_32)65535L;
nuclear@14:    }
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@14:       (png_uint_32)(length + 1));
nuclear@14:    png_ptr->current_text[length] = '\0';
nuclear@14:    png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@14:    png_ptr->current_text_size = (png_size_t)length;
nuclear@14:    png_ptr->current_text_left = (png_size_t)length;
nuclear@14:    png_ptr->process_mode = PNG_READ_iTXt_MODE;
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14: 
nuclear@14:    if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@14:    {
nuclear@14:       png_size_t text_size;
nuclear@14: 
nuclear@14:       if (png_ptr->buffer_size < png_ptr->current_text_left)
nuclear@14:          text_size = png_ptr->buffer_size;
nuclear@14:       else
nuclear@14:          text_size = png_ptr->current_text_left;
nuclear@14:       png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@14:       png_ptr->current_text_left -= text_size;
nuclear@14:       png_ptr->current_text_ptr += text_size;
nuclear@14:    }
nuclear@14:    if (!(png_ptr->current_text_left))
nuclear@14:    {
nuclear@14:       png_textp text_ptr;
nuclear@14:       png_charp key;
nuclear@14:       int comp_flag;
nuclear@14:       png_charp lang;
nuclear@14:       png_charp lang_key;
nuclear@14:       png_charp text;
nuclear@14:       int ret;
nuclear@14: 
nuclear@14:       if (png_ptr->buffer_size < 4)
nuclear@14:       {
nuclear@14:          png_push_save_buffer(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14: 
nuclear@14:       png_push_crc_finish(png_ptr);
nuclear@14: 
nuclear@14: #if defined(PNG_MAX_MALLOC_64K)
nuclear@14:       if (png_ptr->skip_length)
nuclear@14:          return;
nuclear@14: #endif
nuclear@14: 
nuclear@14:       key = png_ptr->current_text;
nuclear@14: 
nuclear@14:       for (lang = key; *lang; lang++)
nuclear@14:          /* empty loop */ ;
nuclear@14: 
nuclear@14:       if (lang < key + png_ptr->current_text_size - 3)
nuclear@14:          lang++;
nuclear@14: 
nuclear@14:       comp_flag = *lang++;
nuclear@14:       lang++;     /* skip comp_type, always zero */
nuclear@14: 
nuclear@14:       for (lang_key = lang; *lang_key; lang_key++)
nuclear@14:          /* empty loop */ ;
nuclear@14:       lang_key++;        /* skip NUL separator */
nuclear@14: 
nuclear@14:       text=lang_key;
nuclear@14:       if (lang_key < key + png_ptr->current_text_size - 1)
nuclear@14:       {
nuclear@14:         for (; *text; text++)
nuclear@14:            /* empty loop */ ;
nuclear@14:       }
nuclear@14: 
nuclear@14:       if (text < key + png_ptr->current_text_size)
nuclear@14:          text++;
nuclear@14: 
nuclear@14:       text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@14:          (png_uint_32)png_sizeof(png_text));
nuclear@14:       text_ptr->compression = comp_flag + 2;
nuclear@14:       text_ptr->key = key;
nuclear@14:       text_ptr->lang = lang;
nuclear@14:       text_ptr->lang_key = lang_key;
nuclear@14:       text_ptr->text = text;
nuclear@14:       text_ptr->text_length = 0;
nuclear@14:       text_ptr->itxt_length = png_strlen(text);
nuclear@14: 
nuclear@14:       ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@14: 
nuclear@14:       png_ptr->current_text = NULL;
nuclear@14: 
nuclear@14:       png_free(png_ptr, text_ptr);
nuclear@14:       if (ret)
nuclear@14:         png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
nuclear@14:    }
nuclear@14: }
nuclear@14: #endif
nuclear@14: 
nuclear@14: /* This function is called when we haven't found a handler for this
nuclear@14:  * chunk.  If there isn't a problem with the chunk itself (ie a bad chunk
nuclear@14:  * name or a critical chunk), the chunk is (currently) silently ignored.
nuclear@14:  */
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@14:    length)
nuclear@14: {
nuclear@14:    png_uint_32 skip = 0;
nuclear@14: 
nuclear@14:    if (!(png_ptr->chunk_name[0] & 0x20))
nuclear@14:    {
nuclear@14: #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@14:       if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
nuclear@14:          PNG_HANDLE_CHUNK_ALWAYS
nuclear@14: #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@14:          && png_ptr->read_user_chunk_fn == NULL
nuclear@14: #endif
nuclear@14:          )
nuclear@14: #endif
nuclear@14:          png_chunk_error(png_ptr, "unknown critical chunk");
nuclear@14: 
nuclear@14:       info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@14:    }
nuclear@14: 
nuclear@14: #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@14:    if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
nuclear@14:    {
nuclear@14: #ifdef PNG_MAX_MALLOC_64K
nuclear@14:       if (length > (png_uint_32)65535L)
nuclear@14:       {
nuclear@14:           png_warning(png_ptr, "unknown chunk too large to fit in memory");
nuclear@14:           skip = length - (png_uint_32)65535L;
nuclear@14:           length = (png_uint_32)65535L;
nuclear@14:       }
nuclear@14: #endif
nuclear@14:       png_memcpy((png_charp)png_ptr->unknown_chunk.name,
nuclear@14:                  (png_charp)png_ptr->chunk_name, 
nuclear@14:                  png_sizeof(png_ptr->unknown_chunk.name));
nuclear@14:       png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1]
nuclear@14:         = '\0';
nuclear@14: 
nuclear@14:       png_ptr->unknown_chunk.size = (png_size_t)length;
nuclear@14:       if (length == 0)
nuclear@14:          png_ptr->unknown_chunk.data = NULL;
nuclear@14:       else
nuclear@14:       {
nuclear@14:          png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr,
nuclear@14:        (png_uint_32)length);
nuclear@14:          png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
nuclear@14:       }
nuclear@14: #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@14:       if (png_ptr->read_user_chunk_fn != NULL)
nuclear@14:       {
nuclear@14:          /* callback to user unknown chunk handler */
nuclear@14:          int ret;
nuclear@14:          ret = (*(png_ptr->read_user_chunk_fn))
nuclear@14:            (png_ptr, &png_ptr->unknown_chunk);
nuclear@14:          if (ret < 0)
nuclear@14:             png_chunk_error(png_ptr, "error in user chunk");
nuclear@14:          if (ret == 0)
nuclear@14:          {
nuclear@14:             if (!(png_ptr->chunk_name[0] & 0x20))
nuclear@14:                if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
nuclear@14:                     PNG_HANDLE_CHUNK_ALWAYS)
nuclear@14:                   png_chunk_error(png_ptr, "unknown critical chunk");
nuclear@14:             png_set_unknown_chunks(png_ptr, info_ptr,
nuclear@14:                &png_ptr->unknown_chunk, 1);
nuclear@14:          }
nuclear@14:       }
nuclear@14:       else
nuclear@14: #endif
nuclear@14:         png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
nuclear@14:       png_free(png_ptr, png_ptr->unknown_chunk.data);
nuclear@14:       png_ptr->unknown_chunk.data = NULL;
nuclear@14:    }
nuclear@14:    else
nuclear@14: #endif
nuclear@14:       skip=length;
nuclear@14:    png_push_crc_skip(png_ptr, skip);
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_have_info(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14:    if (png_ptr->info_fn != NULL)
nuclear@14:       (*(png_ptr->info_fn))(png_ptr, info_ptr);
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_have_end(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14:    if (png_ptr->end_fn != NULL)
nuclear@14:       (*(png_ptr->end_fn))(png_ptr, info_ptr);
nuclear@14: }
nuclear@14: 
nuclear@14: void /* PRIVATE */
nuclear@14: png_push_have_row(png_structp png_ptr, png_bytep row)
nuclear@14: {
nuclear@14:    if (png_ptr->row_fn != NULL)
nuclear@14:       (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
nuclear@14:          (int)png_ptr->pass);
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_progressive_combine_row (png_structp png_ptr,
nuclear@14:    png_bytep old_row, png_bytep new_row)
nuclear@14: {
nuclear@14: #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14:    PNG_CONST int FARDATA png_pass_dsp_mask[7] =
nuclear@14:       {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
nuclear@14: #endif
nuclear@14:    if (png_ptr == NULL) return;
nuclear@14:    if (new_row != NULL)    /* new_row must == png_ptr->row_buf here. */
nuclear@14:       png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
nuclear@14:    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
nuclear@14:    png_progressive_end_ptr end_fn)
nuclear@14: {
nuclear@14:    if (png_ptr == NULL) return;
nuclear@14:    png_ptr->info_fn = info_fn;
nuclear@14:    png_ptr->row_fn = row_fn;
nuclear@14:    png_ptr->end_fn = end_fn;
nuclear@14: 
nuclear@14:    png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
nuclear@14: }
nuclear@14: 
nuclear@14: png_voidp PNGAPI
nuclear@14: png_get_progressive_ptr(png_structp png_ptr)
nuclear@14: {
nuclear@14:    if (png_ptr == NULL) return (NULL);
nuclear@14:    return png_ptr->io_ptr;
nuclear@14: }
nuclear@14: #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */