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 *

 * Last changed in libpng 1.5.1 [$RDATE%]

 * Copyright (c) 1998-2011 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.)

 *

 * This code is released under the libpng license.

 * For conditions of distribution and use, see the disclaimer

 * and license in png.h

 *

 * This file contains routines that an application calls directly to

 * read a PNG file or stream.

 */

PNG_FUNCTION(png_structp,PNGAPI

png_create_read_struct,(png_const_charp user_png_ver, png_voidp error_ptr,

    png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)

{

   return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,

       warn_fn, NULL, NULL, NULL));

}

 * needed.

 */

PNG_FUNCTION(png_structp,PNGAPI

png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,

    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,

    png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)

{

#endif /* PNG_USER_MEM_SUPPORTED */

   volatile

#endif

   png_structp png_ptr;

   volatile int png_cleanup_needed = 0;

#ifdef USE_FAR_KEYWORD

   jmp_buf png_jmpbuf;

#endif

#endif

   png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,

       malloc_fn, mem_ptr);

#else

   png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);

#endif

   if (png_ptr == NULL)

      return (NULL);

#ifdef PNG_USER_LIMITS_SUPPORTED

   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;

   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;

   /* Added at libpng-1.2.43 and 1.4.0 */

   png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;

#  endif

   /* Added at libpng-1.2.43 and 1.4.1 */

   png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;

#  endif

#endif

/* Applications that neglect to set up their own setjmp() and then

   encounter a png_error() will longjmp here.  Since the jmpbuf is

   then meaningless we abort instead of returning. */

#ifdef USE_FAR_KEYWORD

   if (setjmp(png_jmpbuf))

#else

   if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */

#endif

      PNG_ABORT();

#ifdef USE_FAR_KEYWORD

   png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf));

#endif

#endif /* PNG_SETJMP_SUPPORTED */

   png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);

#endif

   {

      i = 0;

      {

         if (user_png_ver[i] != png_libpng_ver[i])

            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;

      } while (png_libpng_ver[i++]);

   }

      png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;

   {

     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so

      * we must recompile any applications that use any older library version.

      * For versions after libpng 1.0, we will be compatible, so we need

      * only check the first digit.

      */

      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||

          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||

          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))

      {

#ifdef PNG_CONSOLE_IO_SUPPORTED

         char msg[80];

         if (user_png_ver)

         {

            png_snprintf2(msg, 80,

                "Application built with libpng-%.20s"

                " but running with %.20s",

                user_png_ver,

                png_libpng_ver);

            png_warning(png_ptr, msg);

         }

#else

         png_warning(png_ptr,

             "Incompatible libpng version in application and library");

#endif

#ifdef PNG_ERROR_NUMBERS_SUPPORTED

         png_ptr->flags = 0;

#endif

      }

   }

   {

   /* Initialize zbuf - compression buffer */

   png_ptr->zbuf_size = PNG_ZBUF_SIZE;

   png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, png_ptr->zbuf_size);

      png_cleanup_needed = 1;

   }

   png_ptr->zstream.zfree = png_zfree;

   png_ptr->zstream.opaque = (voidpf)png_ptr;

   {

      switch (inflateInit(&png_ptr->zstream))

      {

         case Z_OK:

            break; /* Do nothing */

            png_warning(png_ptr, "zlib memory error");

            png_cleanup_needed = 1;

            break;

            png_warning(png_ptr, "zlib stream error");

            png_cleanup_needed = 1;

            break;

            png_warning(png_ptr, "zlib version error");

            png_cleanup_needed = 1;

            break;

            png_cleanup_needed = 1;

      }

   }

   {

      /* Clean up PNG structure and deallocate any memory. */

      png_free(png_ptr, png_ptr->zbuf);

      png_ptr->zbuf = NULL;

#ifdef PNG_USER_MEM_SUPPORTED

      png_destroy_struct_2((png_voidp)png_ptr,

          (png_free_ptr)free_fn, (png_voidp)mem_ptr);

#else

      png_destroy_struct((png_voidp)png_ptr);

#endif

      return (NULL);

   }

   png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;

}

/* Read the information before the actual image data.  This has been

 * changed in v0.90 to allow reading a file that already has the magic

 * bytes read from the stream.  You can tell libpng how many bytes have

 * been read from the beginning of the stream (up to the maximum of 8)

 * via png_set_sig_bytes(), and we will only check the remaining bytes

 * here.  The application can then have access to the signature bytes we

 * read if it is determined that this isn't a valid PNG file.

 */

void PNGAPI

png_read_info(png_structp png_ptr, png_infop info_ptr)

{

   png_debug(1, "in png_read_info");

      return;

   png_read_sig(png_ptr, info_ptr);

   {

      PNG_IHDR;

      PNG_IDAT;

      PNG_IEND;

      PNG_PLTE;

#ifdef PNG_READ_bKGD_SUPPORTED

      PNG_bKGD;

#endif

#ifdef PNG_READ_cHRM_SUPPORTED

      PNG_cHRM;

#endif

#ifdef PNG_READ_gAMA_SUPPORTED

      PNG_gAMA;

#endif

#ifdef PNG_READ_hIST_SUPPORTED

      PNG_hIST;

#endif

#ifdef PNG_READ_iCCP_SUPPORTED

      PNG_iCCP;

#endif

#ifdef PNG_READ_iTXt_SUPPORTED

      PNG_iTXt;

#endif

#ifdef PNG_READ_oFFs_SUPPORTED

      PNG_oFFs;

#endif

#ifdef PNG_READ_pCAL_SUPPORTED

      PNG_pCAL;

#endif

#ifdef PNG_READ_pHYs_SUPPORTED

      PNG_pHYs;

#endif

#ifdef PNG_READ_sBIT_SUPPORTED

      PNG_sBIT;

#endif

#ifdef PNG_READ_sCAL_SUPPORTED

      PNG_sCAL;

#endif

#ifdef PNG_READ_sPLT_SUPPORTED

      PNG_sPLT;

#endif

#ifdef PNG_READ_sRGB_SUPPORTED

      PNG_sRGB;

#endif

#ifdef PNG_READ_tEXt_SUPPORTED

      PNG_tEXt;

#endif

#ifdef PNG_READ_tIME_SUPPORTED

      PNG_tIME;

#endif

#ifdef PNG_READ_tRNS_SUPPORTED

      PNG_tRNS;

#endif

#ifdef PNG_READ_zTXt_SUPPORTED

      PNG_zTXt;

#endif

      png_uint_32 length = png_read_chunk_header(png_ptr);

      PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;

       * matching the chunk name rather than a linear search.

       */

      if (!png_memcmp(chunk_name, png_IDAT, 4))

         if (png_ptr->mode & PNG_AFTER_IDAT)

            png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;

         png_handle_IHDR(png_ptr, info_ptr, length);

         png_handle_IEND(png_ptr, info_ptr, length);

      else if (png_handle_as_unknown(png_ptr, chunk_name))

      {

         if (!png_memcmp(chunk_name, png_IDAT, 4))

            png_ptr->mode |= PNG_HAVE_IDAT;

            png_ptr->mode |= PNG_HAVE_PLTE;

         {

            if (!(png_ptr->mode & PNG_HAVE_IHDR))

               png_error(png_ptr, "Missing IHDR before IDAT");

                !(png_ptr->mode & PNG_HAVE_PLTE))

               png_error(png_ptr, "Missing PLTE before IDAT");

         }

      }

#endif

      else if (!png_memcmp(chunk_name, png_PLTE, 4))

         png_handle_PLTE(png_ptr, info_ptr, length);

      {

         if (!(png_ptr->mode & PNG_HAVE_IHDR))

            png_error(png_ptr, "Missing IHDR before IDAT");

             !(png_ptr->mode & PNG_HAVE_PLTE))

            png_error(png_ptr, "Missing PLTE before IDAT");

         png_ptr->mode |= PNG_HAVE_IDAT;

         break;

      }

      else if (!png_memcmp(chunk_name, png_bKGD, 4))

         png_handle_bKGD(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_cHRM, 4))

         png_handle_cHRM(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_gAMA, 4))

         png_handle_gAMA(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_hIST, 4))

         png_handle_hIST(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_oFFs, 4))

         png_handle_oFFs(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_pCAL, 4))

         png_handle_pCAL(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_sCAL, 4))

         png_handle_sCAL(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_pHYs, 4))

         png_handle_pHYs(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_sBIT, 4))

         png_handle_sBIT(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_sRGB, 4))

         png_handle_sRGB(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_iCCP, 4))

         png_handle_iCCP(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_sPLT, 4))

         png_handle_sPLT(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_tEXt, 4))

         png_handle_tEXt(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_tIME, 4))

         png_handle_tIME(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_tRNS, 4))

         png_handle_tRNS(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_zTXt, 4))

         png_handle_zTXt(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_iTXt, 4))

         png_handle_iTXt(png_ptr, info_ptr, length);

#endif

         png_handle_unknown(png_ptr, info_ptr, length);

   }

}

#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */

void PNGAPI

png_read_update_info(png_structp png_ptr, png_infop info_ptr)

{

   png_debug(1, "in png_read_update_info");

      return;

      png_read_start_row(png_ptr);

      png_warning(png_ptr,

          "Ignoring extra png_read_update_info() call;"

          " row buffer not reallocated");

}

/* Initialize palette, background, etc, after transformations

 * are set, but before any reading takes place.  This allows

 * the user to obtain a gamma-corrected palette, for example.

 * If the user doesn't call this, we will do it ourselves.

 */

void PNGAPI

png_start_read_image(png_structp png_ptr)

{

   png_debug(1, "in png_start_read_image");

      return;

      png_read_start_row(png_ptr);

   else

      png_warning(png_ptr,

          "Ignoring extra png_start_read_image() call;"

          " row buffer not reallocated");

}

#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */

void PNGAPI

png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)

{

   PNG_IDAT;

   PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,

       0xff};

   PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};

   int ret;

      return;

       (unsigned long)png_ptr->row_number, png_ptr->pass);

      png_read_start_row(png_ptr);

   {

   /* Check for transforms that have been set but were defined out */

#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)

   if (png_ptr->transformations & PNG_INVERT_MONO)

      png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined");

#endif

   if (png_ptr->transformations & PNG_FILLER)

      png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined");

#endif

    !defined(PNG_READ_PACKSWAP_SUPPORTED)

   if (png_ptr->transformations & PNG_PACKSWAP)

      png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined");

#endif

   if (png_ptr->transformations & PNG_PACK)

      png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined");

#endif

   if (png_ptr->transformations & PNG_SHIFT)

      png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined");

#endif

   if (png_ptr->transformations & PNG_BGR)

      png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined");

#endif

   if (png_ptr->transformations & PNG_SWAP_BYTES)

      png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined");

#endif

   }

   /* If interlaced and we do not need a new row, combine row and return */

   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))

   {

      switch (png_ptr->pass)

      {

         case 0:

            if (png_ptr->row_number & 0x07)

            {

               if (dsp_row != NULL)

                  png_combine_row(png_ptr, dsp_row,

                     png_pass_dsp_mask[png_ptr->pass]);

               png_read_finish_row(png_ptr);

               return;

            }

            break;

            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)

            {

               if (dsp_row != NULL)

                  png_combine_row(png_ptr, dsp_row,

                      png_pass_dsp_mask[png_ptr->pass]);

               return;

            }

            break;

            if ((png_ptr->row_number & 0x07) != 4)

            {

               if (dsp_row != NULL && (png_ptr->row_number & 4))

                  png_combine_row(png_ptr, dsp_row,

                      png_pass_dsp_mask[png_ptr->pass]);

               return;

            }

            break;

            if ((png_ptr->row_number & 3) || png_ptr->width < 3)

            {

               if (dsp_row != NULL)

                  png_combine_row(png_ptr, dsp_row,

                      png_pass_dsp_mask[png_ptr->pass]);

               return;

            }

            break;

            if ((png_ptr->row_number & 3) != 2)

            {

               if (dsp_row != NULL && (png_ptr->row_number & 2))

                  png_combine_row(png_ptr, dsp_row,

                      png_pass_dsp_mask[png_ptr->pass]);

               return;

            }

            break;

         case 5:

            if ((png_ptr->row_number & 1) || png_ptr->width < 2)

            {

               if (dsp_row != NULL)

                  png_combine_row(png_ptr, dsp_row,

                      png_pass_dsp_mask[png_ptr->pass]);

               return;

            }

            break;

         case 6:

            if (!(png_ptr->row_number & 1))

            {

               png_read_finish_row(png_ptr);

               return;

            }

            break;

      }

   }

#endif

      png_error(png_ptr, "Invalid attempt to read row data");

   png_ptr->zstream.avail_out =

       (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth,

       png_ptr->iwidth) + 1);

   {

      if (!(png_ptr->zstream.avail_in))

      {

         while (!png_ptr->idat_size)

         {

            png_crc_finish(png_ptr, 0);

            if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))

               png_error(png_ptr, "Not enough image data");

         }

         png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;

         png_ptr->zstream.next_in = png_ptr->zbuf;

         if (png_ptr->zbuf_size > png_ptr->idat_size)

            png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;

         png_crc_read(png_ptr, png_ptr->zbuf,

             (png_size_t)png_ptr->zstream.avail_in);

         png_ptr->idat_size -= png_ptr->zstream.avail_in;

      }

      {

         if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||

            png_ptr->idat_size)

            png_benign_error(png_ptr, "Extra compressed data");

         png_ptr->mode |= PNG_AFTER_IDAT;

         png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;

         break;

      }

         png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :

             "Decompression error");

   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_ROWBYTES(png_ptr->row_info.pixel_depth,

       png_ptr->row_info.width);

   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]));

   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&

       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))

   {

      /* Intrapixel differencing */

      png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);

   }

#endif

      png_do_read_transformations(png_ptr);

   /* 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);

         png_combine_row(png_ptr, dsp_row, png_pass_dsp_mask[png_ptr->pass]);

         png_combine_row(png_ptr, row, png_pass_mask[png_ptr->pass]);

   }

#endif

   {

      if (row != NULL)

         png_combine_row(png_ptr, row, 0xff);

         png_combine_row(png_ptr, dsp_row, 0xff);

   }

   png_read_finish_row(png_ptr);

      (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);

}

#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */

/* Read one or more rows of image data.  If the image is interlaced,

 * and png_set_interlace_handling() has been called, the rows need to

 * contain the contents of the rows from the previous pass.  If the

 * image has alpha or transparency, and png_handle_alpha()[*] has been

 * called, the rows contents must be initialized to the contents of the

 * screen.

 *

 * "row" holds the actual image, and pixels are placed in it

 * as they arrive.  If the image is displayed after each pass, it will

 * appear to "sparkle" in.  "display_row" can be used to display a

 * "chunky" progressive image, with finer detail added as it becomes

 * available.  If you do not want this "chunky" display, you may pass

 * NULL for display_row.  If you do not want the sparkle display, and

 * you have not called png_handle_alpha(), you may pass NULL for rows.

 * If you have called png_handle_alpha(), and the image has either an

 * alpha channel or a transparency chunk, you must provide a buffer for

 * rows.  In this case, you do not have to provide a display_row buffer

 * also, but you may.  If the image is not interlaced, or if you have

 * not called png_set_interlace_handling(), the display_row buffer will

 * be ignored, so pass NULL to it.

 *

 * [*] png_handle_alpha() does not exist yet, as of this version of libpng

 */

png_read_rows(png_structp png_ptr, png_bytepp row,

    png_bytepp display_row, png_uint_32 num_rows)

{

   png_uint_32 i;

   png_bytepp rp;

   png_bytepp dp;

      return;

   dp = display_row;

   if (rp != NULL && dp != NULL)

      for (i = 0; i < num_rows; i++)

      {

         png_bytep rptr = *rp++;

         png_bytep dptr = *dp++;

      }

      for (i = 0; i < num_rows; i++)

      {

         png_bytep rptr = *rp;

         png_read_row(png_ptr, rptr, NULL);

         rp++;

      }

      for (i = 0; i < num_rows; i++)

      {

         png_bytep dptr = *dp;

         png_read_row(png_ptr, NULL, dptr);

         dp++;

      }

}

#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */

/* Read the entire image.  If the image has an alpha channel or a tRNS

 * chunk, and you have called png_handle_alpha()[*], you will need to

 * initialize the image to the current image that PNG will be overlaying.

 * We set the num_rows again here, in case it was incorrectly set in

 * png_read_start_row() by a call to png_read_update_info() or

 * png_start_read_image() if png_set_interlace_handling() wasn't called

 * prior to either of these functions like it should have been.  You can

 * only call this function once.  If you desire to have an image for

 * each pass of a interlaced image, use png_read_rows() instead.

 *

 * [*] png_handle_alpha() does not exist yet, as of this version of libpng

 */

void PNGAPI

png_read_image(png_structp png_ptr, png_bytepp image)

{

   png_uint_32 i, image_height;

   int pass, j;

   png_bytepp rp;

      return;

   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))

   {

      pass = png_set_interlace_handling(png_ptr);

      /* And make sure transforms are initialized. */

      png_start_read_image(png_ptr);

   }

   else

   {

      if (png_ptr->interlaced && !(png_ptr->transformations & PNG_INTERLACE))

      {

         /* Caller called png_start_read_image or png_read_update_info without

          * first turning on the PNG_INTERLACE transform.  We can fix this here,

          * but the caller should do it!

          */

         png_warning(png_ptr, "Interlace handling should be turned on when "

            "using png_read_image");

         /* Make sure this is set correctly */

         png_ptr->num_rows = png_ptr->height;

      }

       * the above error case.

       */

      pass = png_set_interlace_handling(png_ptr);

   }

#else

   if (png_ptr->interlaced)

      png_error(png_ptr,

          "Cannot read interlaced image -- interlace handler disabled");

#endif

   {

      rp = image;

      for (i = 0; i < image_height; i++)

      {

         png_read_row(png_ptr, *rp, NULL);

         rp++;

      }

   }

}

#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */

/* Read the end of the PNG file.  Will not read past the end of the

 * file, will verify the end is accurate, and will read any comments

 * or time information at the end of the file, if info is not NULL.

 */

void PNGAPI

png_read_end(png_structp png_ptr, png_infop info_ptr)

{

   png_debug(1, "in png_read_end");

      return;

   {

      PNG_IHDR;

      PNG_IDAT;

      PNG_IEND;

      PNG_PLTE;

#ifdef PNG_READ_bKGD_SUPPORTED

      PNG_bKGD;

#endif

#ifdef PNG_READ_cHRM_SUPPORTED

      PNG_cHRM;

#endif

#ifdef PNG_READ_gAMA_SUPPORTED

      PNG_gAMA;

#endif

#ifdef PNG_READ_hIST_SUPPORTED

      PNG_hIST;

#endif

#ifdef PNG_READ_iCCP_SUPPORTED

      PNG_iCCP;

#endif

#ifdef PNG_READ_iTXt_SUPPORTED

      PNG_iTXt;

#endif

#ifdef PNG_READ_oFFs_SUPPORTED

      PNG_oFFs;

#endif

#ifdef PNG_READ_pCAL_SUPPORTED

      PNG_pCAL;

#endif

#ifdef PNG_READ_pHYs_SUPPORTED

      PNG_pHYs;

#endif

#ifdef PNG_READ_sBIT_SUPPORTED

      PNG_sBIT;

#endif

#ifdef PNG_READ_sCAL_SUPPORTED

      PNG_sCAL;

#endif

#ifdef PNG_READ_sPLT_SUPPORTED

      PNG_sPLT;

#endif

#ifdef PNG_READ_sRGB_SUPPORTED

      PNG_sRGB;

#endif

#ifdef PNG_READ_tEXt_SUPPORTED

      PNG_tEXt;

#endif

#ifdef PNG_READ_tIME_SUPPORTED

      PNG_tIME;

#endif

#ifdef PNG_READ_tRNS_SUPPORTED

      PNG_tRNS;

#endif

#ifdef PNG_READ_zTXt_SUPPORTED

      PNG_zTXt;

#endif

      png_uint_32 length = png_read_chunk_header(png_ptr);

      PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;

         png_handle_IHDR(png_ptr, info_ptr, length);

         png_handle_IEND(png_ptr, info_ptr, length);

      else if (png_handle_as_unknown(png_ptr, chunk_name))

      {

         if (!png_memcmp(chunk_name, png_IDAT, 4))

         {

            if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))

               png_benign_error(png_ptr, "Too many IDATs found");

         }

         png_handle_unknown(png_ptr, info_ptr, length);

         if (!png_memcmp(chunk_name, png_PLTE, 4))

            png_ptr->mode |= PNG_HAVE_PLTE;

      }

#endif

      {

         /* Zero length IDATs are legal after the last IDAT has been

          * read, but not after other chunks have been read.

          */

         if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))

            png_benign_error(png_ptr, "Too many IDATs found");

      }

      else if (!png_memcmp(chunk_name, png_PLTE, 4))

         png_handle_PLTE(png_ptr, info_ptr, length);

      else if (!png_memcmp(chunk_name, png_bKGD, 4))

         png_handle_bKGD(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_cHRM, 4))

         png_handle_cHRM(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_gAMA, 4))

         png_handle_gAMA(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_hIST, 4))

         png_handle_hIST(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_oFFs, 4))

         png_handle_oFFs(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_pCAL, 4))

         png_handle_pCAL(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_sCAL, 4))

         png_handle_sCAL(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_pHYs, 4))

         png_handle_pHYs(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_sBIT, 4))

         png_handle_sBIT(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_sRGB, 4))

         png_handle_sRGB(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_iCCP, 4))

         png_handle_iCCP(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_sPLT, 4))

         png_handle_sPLT(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_tEXt, 4))

         png_handle_tEXt(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_tIME, 4))

         png_handle_tIME(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_tRNS, 4))

         png_handle_tRNS(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_zTXt, 4))

         png_handle_zTXt(png_ptr, info_ptr, length);

#endif

      else if (!png_memcmp(chunk_name, png_iTXt, 4))

         png_handle_iTXt(png_ptr, info_ptr, length);

#endif

         png_handle_unknown(png_ptr, info_ptr, length);

   } while (!(png_ptr->mode & PNG_HAVE_IEND));

}

#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */

void PNGAPI

png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,

    png_infopp end_info_ptr_ptr)

{

   png_structp png_ptr = NULL;

   png_infop info_ptr = NULL, end_info_ptr = NULL;

#ifdef PNG_USER_MEM_SUPPORTED

   png_free_ptr free_fn = NULL;

   png_voidp mem_ptr = NULL;

#endif

      png_ptr = *png_ptr_ptr;

   if (png_ptr == NULL)

      return;

   free_fn = png_ptr->free_fn;

   mem_ptr = png_ptr->mem_ptr;

#endif

      info_ptr = *info_ptr_ptr;

      end_info_ptr = *end_info_ptr_ptr;

   {

#ifdef PNG_TEXT_SUPPORTED

      png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);

#endif

      png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,

          (png_voidp)mem_ptr);

#else

      png_destroy_struct((png_voidp)info_ptr);

#endif

      *info_ptr_ptr = NULL;

   }

   {

#ifdef PNG_READ_TEXT_SUPPORTED