Removed unnecessary and/or TDE-unrelated code.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

1 files changed, 0 insertions, 1547 deletions

diff --git a/tqtinterface/qt4/src/3rdparty/libpng/pngpread.c b/tqtinterface/qt4/src/3rdparty/libpng/pngpread.c
deleted file mode 100644
index 36701f6..0000000
--- a/tqtinterface/qt4/src/3rdparty/libpng/pngpread.c
+++ /dev/null
@@ -1,1547 +0,0 @@
-
-/* pngpread.c - read a png file in push mode
- *
- * libpng 1.2.5 - October 3, 2002
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- */
-
-#define PNG_INTERNAL
-#include "png.h"
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-
-/* push model modes */
-#define PNG_READ_SIG_MODE   0
-#define PNG_READ_CHUNK_MODE 1
-#define PNG_READ_IDAT_MODE  2
-#define PNG_SKIP_MODE       3
-#define PNG_READ_tEXt_MODE  4
-#define PNG_READ_zTXt_MODE  5
-#define PNG_READ_DONE_MODE  6
-#define PNG_READ_iTXt_MODE  7
-#define PNG_ERROR_MODE      8
-
-void PNGAPI
-png_process_data(png_structp png_ptr, png_infop info_ptr,
-   png_bytep buffer, png_size_t buffer_size)
-{
-   png_push_restore_buffer(png_ptr, buffer, buffer_size);
-
-   while (png_ptr->buffer_size)
-   {
-      png_process_some_data(png_ptr, info_ptr);
-   }
-}
-
-/* What we do with the incoming data depends on what we were previously
- * doing before we ran out of data...
- */
-void /* PRIVATE */
-png_process_some_data(png_structp png_ptr, png_infop info_ptr)
-{
-   switch (png_ptr->process_mode)
-   {
-      case PNG_READ_SIG_MODE:
-      {
-         png_push_read_sig(png_ptr, info_ptr);
-         break;
-      }
-      case PNG_READ_CHUNK_MODE:
-      {
-         png_push_read_chunk(png_ptr, info_ptr);
-         break;
-      }
-      case PNG_READ_IDAT_MODE:
-      {
-         png_push_read_IDAT(png_ptr);
-         break;
-      }
-#if defined(PNG_READ_tEXt_SUPPORTED)
-      case PNG_READ_tEXt_MODE:
-      {
-         png_push_read_tEXt(png_ptr, info_ptr);
-         break;
-      }
-#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
-      case PNG_READ_zTXt_MODE:
-      {
-         png_push_read_zTXt(png_ptr, info_ptr);
-         break;
-      }
-#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
-      case PNG_READ_iTXt_MODE:
-      {
-         png_push_read_iTXt(png_ptr, info_ptr);
-         break;
-      }
-#endif
-      case PNG_SKIP_MODE:
-      {
-         png_push_crc_finish(png_ptr);
-         break;
-      }
-      default:
-      {
-         png_ptr->buffer_size = 0;
-         break;
-      }
-   }
-}
-
-/* Read any remaining signature bytes from the stream and compare them with
- * the correct PNG signature.  It is possible that this routine is called
- * with bytes already read from the signature, either because they have been
- * checked by the calling application, or because of multiple calls to this
- * routine.
- */
-void /* PRIVATE */
-png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
-{
-   png_size_t num_checked = png_ptr->sig_bytes,
-             num_to_check = 8 - num_checked;
-
-   if (png_ptr->buffer_size < num_to_check)
-   {
-      num_to_check = png_ptr->buffer_size;
-   }
-
-   png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
-      num_to_check);
-   png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes+num_to_check);
-
-   if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
-   {
-      if (num_checked < 4 &&
-          png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
-         png_error(png_ptr, "Not a PNG file");
-      else
-         png_error(png_ptr, "PNG file corrupted by ASCII conversion");
-   }
-   else
-   {
-      if (png_ptr->sig_bytes >= 8)
-      {
-         png_ptr->process_mode = PNG_READ_CHUNK_MODE;
-      }
-   }
-}
-
-void /* PRIVATE */
-png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
-{
-#ifdef PNG_USE_LOCAL_ARRAYS
-      PNG_IHDR;
-      PNG_IDAT;
-      PNG_IEND;
-      PNG_PLTE;
-#if defined(PNG_READ_bKGD_SUPPORTED)
-      PNG_bKGD;
-#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
-      PNG_cHRM;
-#endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
-      PNG_gAMA;
-#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
-      PNG_hIST;
-#endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
-      PNG_iCCP;
-#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
-      PNG_iTXt;
-#endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
-      PNG_oFFs;
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-      PNG_pCAL;
-#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
-      PNG_pHYs;
-#endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
-      PNG_sBIT;
-#endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
-      PNG_sCAL;
-#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
-      PNG_sRGB;
-#endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
-      PNG_sPLT;
-#endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
-      PNG_tEXt;
-#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
-      PNG_tIME;
-#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
-      PNG_tRNS;
-#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
-      PNG_zTXt;
-#endif
-#endif /* PNG_USE_LOCAL_ARRAYS */
-   /* First we make sure we have enough data for the 4 byte chunk name
-    * and the 4 byte chunk length before proceeding with decoding the
-    * chunk data.  To fully decode each of these chunks, we also make
-    * sure we have enough data in the buffer for the 4 byte CRC at the
-    * end of every chunk (except IDAT, which is handled separately).
-    */
-   if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
-   {
-      png_byte chunk_length[4];
-
-      if (png_ptr->buffer_size < 8)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-
-      png_push_fill_buffer(png_ptr, chunk_length, 4);
-      png_ptr->push_length = png_get_uint_31(png_ptr,chunk_length);
-      png_reset_crc(png_ptr);
-      png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-      png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
-   }
-
-   if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
-   }
-   else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
-   }
-   else if (!png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
-   {
-      /* If we reach an IDAT chunk, this means we have read all of the
-       * header chunks, and we can start reading the image (or if this
-       * is called after the image has been read - we have an error).
-       */
-     if (!(png_ptr->mode & PNG_HAVE_IHDR))
-       png_error(png_ptr, "Missing IHDR before IDAT");
-     else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
-         !(png_ptr->mode & PNG_HAVE_PLTE))
-       png_error(png_ptr, "Missing PLTE before IDAT");
-
-      if (png_ptr->mode & PNG_HAVE_IDAT)
-      {
-         if (png_ptr->push_length == 0)
-            return;
-
-         if (png_ptr->mode & PNG_AFTER_IDAT)
-            png_error(png_ptr, "Too many IDAT's found");
-      }
-
-      png_ptr->idat_size = png_ptr->push_length;
-      png_ptr->mode |= PNG_HAVE_IDAT;
-      png_ptr->process_mode = PNG_READ_IDAT_MODE;
-      png_push_have_info(png_ptr, info_ptr);
-      png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
-      png_ptr->zstream.next_out = png_ptr->row_buf;
-      return;
-   }
-   else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
-
-      png_ptr->process_mode = PNG_READ_DONE_MODE;
-      png_push_have_end(png_ptr, info_ptr);
-   }
-#if defined(PNG_READ_gAMA_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_bKGD_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
-   else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-   else
-   {
-      if (png_ptr->push_length + 4 > png_ptr->buffer_size)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-      png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-   png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
-}
-
-void /* PRIVATE */
-png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
-{
-   png_ptr->process_mode = PNG_SKIP_MODE;
-   png_ptr->skip_length = skip;
-}
-
-void /* PRIVATE */
-png_push_crc_finish(png_structp png_ptr)
-{
-   if (png_ptr->skip_length && png_ptr->save_buffer_size)
-   {
-      png_size_t save_size;
-
-      if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
-         save_size = (png_size_t)png_ptr->skip_length;
-      else
-         save_size = png_ptr->save_buffer_size;
-
-      png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
-
-      png_ptr->skip_length -= save_size;
-      png_ptr->buffer_size -= save_size;
-      png_ptr->save_buffer_size -= save_size;
-      png_ptr->save_buffer_ptr += save_size;
-   }
-   if (png_ptr->skip_length && png_ptr->current_buffer_size)
-   {
-      png_size_t save_size;
-
-      if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
-         save_size = (png_size_t)png_ptr->skip_length;
-      else
-         save_size = png_ptr->current_buffer_size;
-
-      png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
-
-      png_ptr->skip_length -= save_size;
-      png_ptr->buffer_size -= save_size;
-      png_ptr->current_buffer_size -= save_size;
-      png_ptr->current_buffer_ptr += save_size;
-   }
-   if (!png_ptr->skip_length)
-   {
-      if (png_ptr->buffer_size < 4)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-
-      png_crc_finish(png_ptr, 0);
-      png_ptr->process_mode = PNG_READ_CHUNK_MODE;
-   }
-}
-
-void PNGAPI
-png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
-{
-   png_bytep ptr;
-
-   ptr = buffer;
-   if (png_ptr->save_buffer_size)
-   {
-      png_size_t save_size;
-
-      if (length < png_ptr->save_buffer_size)
-         save_size = length;
-      else
-         save_size = png_ptr->save_buffer_size;
-
-      png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
-      length -= save_size;
-      ptr += save_size;
-      png_ptr->buffer_size -= save_size;
-      png_ptr->save_buffer_size -= save_size;
-      png_ptr->save_buffer_ptr += save_size;
-   }
-   if (length && png_ptr->current_buffer_size)
-   {
-      png_size_t save_size;
-
-      if (length < png_ptr->current_buffer_size)
-         save_size = length;
-      else
-         save_size = png_ptr->current_buffer_size;
-
-      png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
-      png_ptr->buffer_size -= save_size;
-      png_ptr->current_buffer_size -= save_size;
-      png_ptr->current_buffer_ptr += save_size;
-   }
-}
-
-void /* PRIVATE */
-png_push_save_buffer(png_structp png_ptr)
-{
-   if (png_ptr->save_buffer_size)
-   {
-      if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
-      {
-         png_size_t i,istop;
-         png_bytep sp;
-         png_bytep dp;
-
-         istop = png_ptr->save_buffer_size;
-         for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
-            i < istop; i++, sp++, dp++)
-         {
-            *dp = *sp;
-         }
-      }
-   }
-   if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
-      png_ptr->save_buffer_max)
-   {
-      png_size_t new_max;
-      png_bytep old_buffer;
-
-      if (png_ptr->save_buffer_size > PNG_SIZE_MAX - 
-         (png_ptr->current_buffer_size + 256))
-      {
-        png_error(png_ptr, "Potential overflow of save_buffer");
-      }
-      new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
-      old_buffer = png_ptr->save_buffer;
-      png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
-         (png_uint_32)new_max);
-      png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
-      png_free(png_ptr, old_buffer);
-      png_ptr->save_buffer_max = new_max;
-   }
-   if (png_ptr->current_buffer_size)
-   {
-      png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
-         png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
-      png_ptr->save_buffer_size += png_ptr->current_buffer_size;
-      png_ptr->current_buffer_size = 0;
-   }
-   png_ptr->save_buffer_ptr = png_ptr->save_buffer;
-   png_ptr->buffer_size = 0;
-}
-
-void /* PRIVATE */
-png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
-   png_size_t buffer_length)
-{
-   png_ptr->current_buffer = buffer;
-   png_ptr->current_buffer_size = buffer_length;
-   png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
-   png_ptr->current_buffer_ptr = png_ptr->current_buffer;
-}
-
-void /* PRIVATE */
-png_push_read_IDAT(png_structp png_ptr)
-{
-#ifdef PNG_USE_LOCAL_ARRAYS
-   PNG_IDAT;
-#endif
-   if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
-   {
-      png_byte chunk_length[4];
-
-      if (png_ptr->buffer_size < 8)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-
-      png_push_fill_buffer(png_ptr, chunk_length, 4);
-      png_ptr->push_length = png_get_uint_31(png_ptr,chunk_length);
-      png_reset_crc(png_ptr);
-      png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-      png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
-
-      if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
-      {
-         png_ptr->process_mode = PNG_READ_CHUNK_MODE;
-         if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
-            png_error(png_ptr, "Not enough compressed data");
-         return;
-      }
-
-      png_ptr->idat_size = png_ptr->push_length;
-   }
-   if (png_ptr->idat_size && png_ptr->save_buffer_size)
-   {
-      png_size_t save_size;
-
-      if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
-      {
-         save_size = (png_size_t)png_ptr->idat_size;
-         /* check for overflow */
-         if((png_uint_32)save_size != png_ptr->idat_size)
-            png_error(png_ptr, "save_size overflowed in pngpread");
-      }
-      else
-         save_size = png_ptr->save_buffer_size;
-
-      png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
-      if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
-         png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
-      png_ptr->idat_size -= save_size;
-      png_ptr->buffer_size -= save_size;
-      png_ptr->save_buffer_size -= save_size;
-      png_ptr->save_buffer_ptr += save_size;
-   }
-   if (png_ptr->idat_size && png_ptr->current_buffer_size)
-   {
-      png_size_t save_size;
-
-      if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
-      {
-         save_size = (png_size_t)png_ptr->idat_size;
-         /* check for overflow */
-         if((png_uint_32)save_size != png_ptr->idat_size)
-            png_error(png_ptr, "save_size overflowed in pngpread");
-      }
-      else
-         save_size = png_ptr->current_buffer_size;
-
-      png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
-      if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
-        png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
-
-      png_ptr->idat_size -= save_size;
-      png_ptr->buffer_size -= save_size;
-      png_ptr->current_buffer_size -= save_size;
-      png_ptr->current_buffer_ptr += save_size;
-   }
-   if (!png_ptr->idat_size)
-   {
-      if (png_ptr->buffer_size < 4)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-
-      png_crc_finish(png_ptr, 0);
-      png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
-      png_ptr->mode |= PNG_AFTER_IDAT;
-   }
-}
-
-void /* PRIVATE */
-png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
-   png_size_t buffer_length)
-{
-   int ret;
-
-   if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length)
-      png_error(png_ptr, "Extra compression data");
-
-   png_ptr->zstream.next_in = buffer;
-   png_ptr->zstream.avail_in = (uInt)buffer_length;
-   for(;;)
-   {
-      ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
-      if (ret != Z_OK)
-      {
-         if (ret == Z_STREAM_END)
-         {
-            if (png_ptr->zstream.avail_in)
-               png_error(png_ptr, "Extra compressed data");
-            if (!(png_ptr->zstream.avail_out))
-            {
-               png_push_process_row(png_ptr);
-            }
-
-            png_ptr->mode |= PNG_AFTER_IDAT;
-            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
-            break;
-         }
-         else if (ret == Z_BUF_ERROR)
-            break;
-         else
-            png_error(png_ptr, "Decompression Error");
-      }
-      if (!(png_ptr->zstream.avail_out))
-      {
-         if ((
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
-             png_ptr->interlaced && png_ptr->pass > 6) ||
-             (!png_ptr->interlaced &&
-#endif
-             png_ptr->row_number == png_ptr->num_rows-1))
-         {
-           if (png_ptr->zstream.avail_in)
-             png_warning(png_ptr, "Too much data in IDAT chunks");
-           png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
-           break;
-         }
-         png_push_process_row(png_ptr);
-         png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
-         png_ptr->zstream.next_out = png_ptr->row_buf;
-      }
-      else
-         break;
-   }
-}
-
-void /* PRIVATE */
-png_push_process_row(png_structp png_ptr)
-{
-   png_ptr->row_info.color_type = png_ptr->color_type;
-   png_ptr->row_info.width = png_ptr->iwidth;
-   png_ptr->row_info.channels = png_ptr->channels;
-   png_ptr->row_info.bit_depth = png_ptr->bit_depth;
-   png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
-
-   png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
-      (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
-
-   png_read_filter_row(png_ptr, &(png_ptr->row_info),
-      png_ptr->row_buf + 1, png_ptr->prev_row + 1,
-      (int)(png_ptr->row_buf[0]));
-
-   png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
-      png_ptr->rowbytes + 1);
-
-   if (png_ptr->transformations)
-      png_do_read_transformations(png_ptr);
-
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
-   /* blow up interlaced rows to full size */
-   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
-   {
-      if (png_ptr->pass < 6)
-/*       old interface (pre-1.0.9):
-         png_do_read_interlace(&(png_ptr->row_info),
-            png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
- */
-         png_do_read_interlace(png_ptr);
-
-    switch (png_ptr->pass)
-    {
-         case 0:
-         {
-            int i;
-            for (i = 0; i < 8 && png_ptr->pass == 0; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
-            }
-            if (png_ptr->pass == 2) /* pass 1 might be empty */
-            {
-               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
-               {
-                  png_push_have_row(png_ptr, png_bytep_NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-            if (png_ptr->pass == 4 && png_ptr->height <= 4)
-            {
-               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-               {
-                  png_push_have_row(png_ptr, png_bytep_NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-            if (png_ptr->pass == 6 && png_ptr->height <= 4)
-            {
-                png_push_have_row(png_ptr, png_bytep_NULL);
-                png_read_push_finish_row(png_ptr);
-            }
-            break;
-         }
-         case 1:
-         {
-            int i;
-            for (i = 0; i < 8 && png_ptr->pass == 1; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-            if (png_ptr->pass == 2) /* skip top 4 generated rows */
-            {
-               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
-               {
-                  png_push_have_row(png_ptr, png_bytep_NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-            break;
-         }
-         case 2:
-         {
-            int i;
-            for (i = 0; i < 4 && png_ptr->pass == 2; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-            for (i = 0; i < 4 && png_ptr->pass == 2; i++)
-            {
-               png_push_have_row(png_ptr, png_bytep_NULL);
-               png_read_push_finish_row(png_ptr);
-            }
-            if (png_ptr->pass == 4) /* pass 3 might be empty */
-            {
-               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-               {
-                  png_push_have_row(png_ptr, png_bytep_NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-            break;
-         }
-         case 3:
-         {
-            int i;
-            for (i = 0; i < 4 && png_ptr->pass == 3; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-            if (png_ptr->pass == 4) /* skip top two generated rows */
-            {
-               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-               {
-                  png_push_have_row(png_ptr, png_bytep_NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-            break;
-         }
-         case 4:
-         {
-            int i;
-            for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-            for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-            {
-               png_push_have_row(png_ptr, png_bytep_NULL);
-               png_read_push_finish_row(png_ptr);
-            }
-            if (png_ptr->pass == 6) /* pass 5 might be empty */
-            {
-               png_push_have_row(png_ptr, png_bytep_NULL);
-               png_read_push_finish_row(png_ptr);
-            }
-            break;
-         }
-         case 5:
-         {
-            int i;
-            for (i = 0; i < 2 && png_ptr->pass == 5; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-            if (png_ptr->pass == 6) /* skip top generated row */
-            {
-               png_push_have_row(png_ptr, png_bytep_NULL);
-               png_read_push_finish_row(png_ptr);
-            }
-            break;
-         }
-         case 6:
-         {
-            png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-            png_read_push_finish_row(png_ptr);
-            if (png_ptr->pass != 6)
-               break;
-            png_push_have_row(png_ptr, png_bytep_NULL);
-            png_read_push_finish_row(png_ptr);
-         }
-      }
-   }
-   else
-#endif
-   {
-      png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-      png_read_push_finish_row(png_ptr);
-   }
-}
-
-void /* PRIVATE */
-png_read_push_finish_row(png_structp png_ptr)
-{
-#ifdef PNG_USE_LOCAL_ARRAYS
-   /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-   /* start of interlace block */
-   const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
-
-   /* offset to next interlace block */
-   const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
-
-   /* start of interlace block in the y direction */
-   const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
-
-   /* offset to next interlace block in the y direction */
-   const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-
-   /* Width of interlace block.  This is not currently used - if you need
-    * it, uncomment it here and in png.h
-   const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-   */
-
-   /* Height of interlace block.  This is not currently used - if you need
-    * it, uncomment it here and in png.h
-   const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
-   */
-#endif
-
-   png_ptr->row_number++;
-   if (png_ptr->row_number < png_ptr->num_rows)
-      return;
-
-   if (png_ptr->interlaced)
-   {
-      png_ptr->row_number = 0;
-      png_memset_check(png_ptr, png_ptr->prev_row, 0,
-         png_ptr->rowbytes + 1);
-      do
-      {
-         png_ptr->pass++;
-         if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
-             (png_ptr->pass == 3 && png_ptr->width < 3) ||
-             (png_ptr->pass == 5 && png_ptr->width < 2))
-           png_ptr->pass++;
-
-         if (png_ptr->pass > 7)
-            png_ptr->pass--;
-         if (png_ptr->pass >= 7)
-            break;
-
-         png_ptr->iwidth = (png_ptr->width +
-            png_pass_inc[png_ptr->pass] - 1 -
-            png_pass_start[png_ptr->pass]) /
-            png_pass_inc[png_ptr->pass];
-
-         png_ptr->irowbytes = ((png_ptr->iwidth *
-            png_ptr->pixel_depth + 7) >> 3) + 1;
-
-         if (png_ptr->transformations & PNG_INTERLACE)
-            break;
-
-         png_ptr->num_rows = (png_ptr->height +
-            png_pass_yinc[png_ptr->pass] - 1 -
-            png_pass_ystart[png_ptr->pass]) /
-            png_pass_yinc[png_ptr->pass];
-
-      } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
-   }
-}
-
-#if defined(PNG_READ_tEXt_SUPPORTED)
-void /* PRIVATE */
-png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
-   length)
-{
-   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
-      {
-         png_error(png_ptr, "Out of place tEXt");
-         /* to quiet some compiler warnings */
-         if(info_ptr == NULL) return;
-      }
-
-#ifdef PNG_MAX_MALLOC_64K
-   png_ptr->skip_length = 0;  /* This may not be necessary */
-
-   if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
-   {
-      png_warning(png_ptr, "tEXt chunk too large to fit in memory");
-      png_ptr->skip_length = length - (png_uint_32)65535L;
-      length = (png_uint_32)65535L;
-   }
-#endif
-
-   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
-         (png_uint_32)(length+1));
-   png_ptr->current_text[length] = '\0';
-   png_ptr->current_text_ptr = png_ptr->current_text;
-   png_ptr->current_text_size = (png_size_t)length;
-   png_ptr->current_text_left = (png_size_t)length;
-   png_ptr->process_mode = PNG_READ_tEXt_MODE;
-}
-
-void /* PRIVATE */
-png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
-{
-   if (png_ptr->buffer_size && png_ptr->current_text_left)
-   {
-      png_size_t text_size;
-
-      if (png_ptr->buffer_size < png_ptr->current_text_left)
-         text_size = png_ptr->buffer_size;
-      else
-         text_size = png_ptr->current_text_left;
-      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
-      png_ptr->current_text_left -= text_size;
-      png_ptr->current_text_ptr += text_size;
-   }
-   if (!(png_ptr->current_text_left))
-   {
-      png_textp text_ptr;
-      png_charp text;
-      png_charp key;
-      int ret;
-
-      if (png_ptr->buffer_size < 4)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-
-      png_push_crc_finish(png_ptr);
-
-#if defined(PNG_MAX_MALLOC_64K)
-      if (png_ptr->skip_length)
-         return;
-#endif
-
-      key = png_ptr->current_text;
-
-      for (text = key; *text; text++)
-         /* empty loop */ ;
-
-      if (text != key + png_ptr->current_text_size)
-         text++;
-
-      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
-      text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
-      text_ptr->key = key;
-#ifdef PNG_iTXt_SUPPORTED
-      text_ptr->lang = NULL;
-      text_ptr->lang_key = NULL;
-#endif
-      text_ptr->text = text;
-
-      ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
-
-      png_free(png_ptr, key);
-      png_free(png_ptr, text_ptr);
-      png_ptr->current_text = NULL;
-
-      if (ret)
-        png_warning(png_ptr, "Insufficient memory to store text chunk.");
-   }
-}
-#endif
-
-#if defined(PNG_READ_zTXt_SUPPORTED)
-void /* PRIVATE */
-png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
-   length)
-{
-   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
-      {
-         png_error(png_ptr, "Out of place zTXt");
-         /* to quiet some compiler warnings */
-         if(info_ptr == NULL) return;
-      }
-
-#ifdef PNG_MAX_MALLOC_64K
-   /* We can't handle zTXt chunks > 64K, since we don't have enough space
-    * to be able to store the uncompressed data.  Actually, the threshold
-    * is probably around 32K, but it isn't as definite as 64K is.
-    */
-   if (length > (png_uint_32)65535L)
-   {
-      png_warning(png_ptr, "zTXt chunk too large to fit in memory");
-      png_push_crc_skip(png_ptr, length);
-      return;
-   }
-#endif
-
-   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
-       (png_uint_32)(length+1));
-   png_ptr->current_text[length] = '\0';
-   png_ptr->current_text_ptr = png_ptr->current_text;
-   png_ptr->current_text_size = (png_size_t)length;
-   png_ptr->current_text_left = (png_size_t)length;
-   png_ptr->process_mode = PNG_READ_zTXt_MODE;
-}
-
-void /* PRIVATE */
-png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
-{
-   if (png_ptr->buffer_size && png_ptr->current_text_left)
-   {
-      png_size_t text_size;
-
-      if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
-         text_size = png_ptr->buffer_size;
-      else
-         text_size = png_ptr->current_text_left;
-      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
-      png_ptr->current_text_left -= text_size;
-      png_ptr->current_text_ptr += text_size;
-   }
-   if (!(png_ptr->current_text_left))
-   {
-      png_textp text_ptr;
-      png_charp text;
-      png_charp key;
-      int ret;
-      png_size_t text_size, key_size;
-
-      if (png_ptr->buffer_size < 4)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-
-      png_push_crc_finish(png_ptr);
-
-      key = png_ptr->current_text;
-
-      for (text = key; *text; text++)
-         /* empty loop */ ;
-
-      /* zTXt can't have zero text */
-      if (text == key + png_ptr->current_text_size)
-      {
-         png_ptr->current_text = NULL;
-         png_free(png_ptr, key);
-         return;
-      }
-
-      text++;
-
-      if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
-      {
-         png_ptr->current_text = NULL;
-         png_free(png_ptr, key);
-         return;
-      }
-
-      text++;
-
-      png_ptr->zstream.next_in = (png_bytep )text;
-      png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
-         (text - key));
-      png_ptr->zstream.next_out = png_ptr->zbuf;
-      png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
-
-      key_size = text - key;
-      text_size = 0;
-      text = NULL;
-      ret = Z_STREAM_END;
-
-      while (png_ptr->zstream.avail_in)
-      {
-         ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
-         if (ret != Z_OK && ret != Z_STREAM_END)
-         {
-            inflateReset(&png_ptr->zstream);
-            png_ptr->zstream.avail_in = 0;
-            png_ptr->current_text = NULL;
-            png_free(png_ptr, key);
-            png_free(png_ptr, text);
-            return;
-         }
-         if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END)
-         {
-            if (text == NULL)
-            {
-               text = (png_charp)png_malloc(png_ptr,
-                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
-                     + key_size + 1));
-               png_memcpy(text + key_size, png_ptr->zbuf,
-                  png_ptr->zbuf_size - png_ptr->zstream.avail_out);
-               png_memcpy(text, key, key_size);
-               text_size = key_size + png_ptr->zbuf_size -
-                  png_ptr->zstream.avail_out;
-               *(text + text_size) = '\0';
-            }
-            else
-            {
-               png_charp tmp;
-
-               tmp = text;
-               text = (png_charp)png_malloc(png_ptr, text_size +
-                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
-                   + 1));
-               png_memcpy(text, tmp, text_size);
-               png_free(png_ptr, tmp);
-               png_memcpy(text + text_size, png_ptr->zbuf,
-                  png_ptr->zbuf_size - png_ptr->zstream.avail_out);
-               text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
-               *(text + text_size) = '\0';
-            }
-            if (ret != Z_STREAM_END)
-            {
-               png_ptr->zstream.next_out = png_ptr->zbuf;
-               png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
-            }
-         }
-         else
-         {
-            break;
-         }
-
-         if (ret == Z_STREAM_END)
-            break;
-      }
-
-      inflateReset(&png_ptr->zstream);
-      png_ptr->zstream.avail_in = 0;
-
-      if (ret != Z_STREAM_END)
-      {
-         png_ptr->current_text = NULL;
-         png_free(png_ptr, key);
-         png_free(png_ptr, text);
-         return;
-      }
-
-      png_ptr->current_text = NULL;
-      png_free(png_ptr, key);
-      key = text;
-      text += key_size;
-
-      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
-      text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
-      text_ptr->key = key;
-#ifdef PNG_iTXt_SUPPORTED
-      text_ptr->lang = NULL;
-      text_ptr->lang_key = NULL;
-#endif
-      text_ptr->text = text;
-
-      ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
-
-      png_free(png_ptr, key);
-      png_free(png_ptr, text_ptr);
-
-      if (ret)
-        png_warning(png_ptr, "Insufficient memory to store text chunk.");
-   }
-}
-#endif
-
-#if defined(PNG_READ_iTXt_SUPPORTED)
-void /* PRIVATE */
-png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
-   length)
-{
-   if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
-      {
-         png_error(png_ptr, "Out of place iTXt");
-         /* to quiet some compiler warnings */
-         if(info_ptr == NULL) return;
-      }
-
-#ifdef PNG_MAX_MALLOC_64K
-   png_ptr->skip_length = 0;  /* This may not be necessary */
-
-   if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
-   {
-      png_warning(png_ptr, "iTXt chunk too large to fit in memory");
-      png_ptr->skip_length = length - (png_uint_32)65535L;
-      length = (png_uint_32)65535L;
-   }
-#endif
-
-   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
-         (png_uint_32)(length+1));
-   png_ptr->current_text[length] = '\0';
-   png_ptr->current_text_ptr = png_ptr->current_text;
-   png_ptr->current_text_size = (png_size_t)length;
-   png_ptr->current_text_left = (png_size_t)length;
-   png_ptr->process_mode = PNG_READ_iTXt_MODE;
-}
-
-void /* PRIVATE */
-png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
-{
-
-   if (png_ptr->buffer_size && png_ptr->current_text_left)
-   {
-      png_size_t text_size;
-
-      if (png_ptr->buffer_size < png_ptr->current_text_left)
-         text_size = png_ptr->buffer_size;
-      else
-         text_size = png_ptr->current_text_left;
-      png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
-      png_ptr->current_text_left -= text_size;
-      png_ptr->current_text_ptr += text_size;
-   }
-   if (!(png_ptr->current_text_left))
-   {
-      png_textp text_ptr;
-      png_charp key;
-      int comp_flag;
-      png_charp lang;
-      png_charp lang_key;
-      png_charp text;
-      int ret;
-
-      if (png_ptr->buffer_size < 4)
-      {
-         png_push_save_buffer(png_ptr);
-         return;
-      }
-
-      png_push_crc_finish(png_ptr);
-
-#if defined(PNG_MAX_MALLOC_64K)
-      if (png_ptr->skip_length)
-         return;
-#endif
-
-      key = png_ptr->current_text;
-
-      for (lang = key; *lang; lang++)
-         /* empty loop */ ;
-
-      if (lang != key + png_ptr->current_text_size)
-         lang++;
-
-      comp_flag = *lang++;
-      lang++;     /* skip comp_type, always zero */
-
-      for (lang_key = lang; *lang_key; lang_key++)
-         /* empty loop */ ;
-      lang_key++;        /* skip NUL separator */
-
-      for (text = lang_key; *text; text++)
-         /* empty loop */ ;
-
-      if (text != key + png_ptr->current_text_size)
-         text++;
-
-      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
-      text_ptr->compression = comp_flag + 2;
-      text_ptr->key = key;
-      text_ptr->lang = lang;
-      text_ptr->lang_key = lang_key;
-      text_ptr->text = text;
-      text_ptr->text_length = 0;
-      text_ptr->itxt_length = png_strlen(text);
-
-      ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
-
-      png_ptr->current_text = NULL;
-
-      png_free(png_ptr, text_ptr);
-      if (ret)
-        png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
-   }
-}
-#endif
-
-/* This function is called when we haven't found a handler for this
- * chunk.  If there isn't a problem with the chunk itself (ie a bad chunk
- * name or a critical chunk), the chunk is (currently) silently ignored.
- */
-void /* PRIVATE */
-png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
-   length)
-{
-   png_uint_32 skip=0;
-   png_check_chunk_name(png_ptr, png_ptr->chunk_name);
-
-   if (!(png_ptr->chunk_name[0] & 0x20))
-   {
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-      if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
-           HANDLE_CHUNK_ALWAYS
-#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-           && png_ptr->read_user_chunk_fn == NULL
-#endif
-         )
-#endif
-         png_chunk_error(png_ptr, "unknown critical chunk");
-
-      /* to quiet compiler warnings about unused info_ptr */
-      if (info_ptr == NULL)
-         return;
-   }
-
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-   if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
-   {
-       png_unknown_chunk chunk;
-
-#ifdef PNG_MAX_MALLOC_64K
-       if (length > (png_uint_32)65535L)
-       {
-           png_warning(png_ptr, "unknown chunk too large to fit in memory");
-           skip = length - (png_uint_32)65535L;
-           length = (png_uint_32)65535L;
-       }
-#endif
-
-       png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
-       chunk.data = (png_bytep)png_malloc(png_ptr, length);
-       png_crc_read(png_ptr, chunk.data, length);
-       chunk.size = length;
-#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-       if(png_ptr->read_user_chunk_fn != NULL)
-       {
-          /* callback to user unknown chunk handler */
-          if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
-          {
-             if (!(png_ptr->chunk_name[0] & 0x20))
-                if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
-                     HANDLE_CHUNK_ALWAYS)
-                   png_chunk_error(png_ptr, "unknown critical chunk");
-          }
-             png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
-       }
-       else
-#endif
-          png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
-       png_free(png_ptr, chunk.data);
-   }
-   else
-#endif
-      skip=length;
-   png_push_crc_skip(png_ptr, skip);
-}
-
-void /* PRIVATE */
-png_push_have_info(png_structp png_ptr, png_infop info_ptr)
-{
-   if (png_ptr->info_fn != NULL)
-      (*(png_ptr->info_fn))(png_ptr, info_ptr);
-}
-
-void /* PRIVATE */
-png_push_have_end(png_structp png_ptr, png_infop info_ptr)
-{
-   if (png_ptr->end_fn != NULL)
-      (*(png_ptr->end_fn))(png_ptr, info_ptr);
-}
-
-void /* PRIVATE */
-png_push_have_row(png_structp png_ptr, png_bytep row)
-{
-   if (png_ptr->row_fn != NULL)
-      (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
-         (int)png_ptr->pass);
-}
-
-void PNGAPI
-png_progressive_combine_row (png_structp png_ptr,
-   png_bytep old_row, png_bytep new_row)
-{
-#ifdef PNG_USE_LOCAL_ARRAYS
-   const int FARDATA png_pass_dsp_mask[7] =
-      {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
-#endif
-   if (new_row != NULL)    /* new_row must == png_ptr->row_buf here. */
-      png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
-}
-
-void PNGAPI
-png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
-   png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
-   png_progressive_end_ptr end_fn)
-{
-   png_ptr->info_fn = info_fn;
-   png_ptr->row_fn = row_fn;
-   png_ptr->end_fn = end_fn;
-
-   png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
-}
-
-png_voidp PNGAPI
-png_get_progressive_ptr(png_structp png_ptr)
-{
-   return png_ptr->io_ptr;
-}
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */