XFA: Upgrade libpng to 1.6.20.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1591483003 .

1 files changed, 0 insertions, 1596 deletions

diff --git a/third_party/lpng_v163/pngset.c b/third_party/lpng_v163/pngset.c
deleted file mode 100644
index b4790521bb..0000000000
--- a/third_party/lpng_v163/pngset.c
+++ /dev/null
@@ -1,1596 +0,0 @@
-/* pngset.c - storage of image information into info struct

- *

- * Last changed in libpng 1.6.3 [July 18, 2013]

- * Copyright (c) 1998-2013 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

- *

- * The functions here are used during reads to store data from the file

- * into the info struct, and during writes to store application data

- * into the info struct for writing into the file.  This abstracts the

- * info struct and allows us to change the structure in the future.

- */

-

-#include "pngpriv.h"

-

-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

-

-#ifdef PNG_bKGD_SUPPORTED

-void PNGAPI

-png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_const_color_16p background)

-{

-   png_debug1(1, "in %s storage function", "bKGD");

-

-   if (png_ptr == NULL || info_ptr == NULL || background == NULL)

-      return;

-

-   info_ptr->background = *background;

-   info_ptr->valid |= PNG_INFO_bKGD;

-}

-#endif

-

-#ifdef PNG_cHRM_SUPPORTED

-void PNGFAPI

-png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,

-    png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,

-    png_fixed_point blue_x, png_fixed_point blue_y)

-{

-   png_xy xy;

-

-   png_debug1(1, "in %s storage function", "cHRM fixed");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   xy.redx = red_x;

-   xy.redy = red_y;

-   xy.greenx = green_x;

-   xy.greeny = green_y;

-   xy.bluex = blue_x;

-   xy.bluey = blue_y;

-   xy.whitex = white_x;

-   xy.whitey = white_y;

-

-   if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,

-      2/* override with app values*/))

-      info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;

-

-   png_colorspace_sync_info(png_ptr, info_ptr);

-}

-

-void PNGFAPI

-png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_fixed_point int_red_X, png_fixed_point int_red_Y,

-    png_fixed_point int_red_Z, png_fixed_point int_green_X,

-    png_fixed_point int_green_Y, png_fixed_point int_green_Z,

-    png_fixed_point int_blue_X, png_fixed_point int_blue_Y,

-    png_fixed_point int_blue_Z)

-{

-   png_XYZ XYZ;

-

-   png_debug1(1, "in %s storage function", "cHRM XYZ fixed");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   XYZ.red_X = int_red_X;

-   XYZ.red_Y = int_red_Y;

-   XYZ.red_Z = int_red_Z;

-   XYZ.green_X = int_green_X;

-   XYZ.green_Y = int_green_Y;

-   XYZ.green_Z = int_green_Z;

-   XYZ.blue_X = int_blue_X;

-   XYZ.blue_Y = int_blue_Y;

-   XYZ.blue_Z = int_blue_Z;

-

-   if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, &XYZ, 2))

-      info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;

-

-   png_colorspace_sync_info(png_ptr, info_ptr);

-}

-

-#  ifdef PNG_FLOATING_POINT_SUPPORTED

-void PNGAPI

-png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,

-    double white_x, double white_y, double red_x, double red_y,

-    double green_x, double green_y, double blue_x, double blue_y)

-{

-   png_set_cHRM_fixed(png_ptr, info_ptr,

-      png_fixed(png_ptr, white_x, "cHRM White X"),

-      png_fixed(png_ptr, white_y, "cHRM White Y"),

-      png_fixed(png_ptr, red_x, "cHRM Red X"),

-      png_fixed(png_ptr, red_y, "cHRM Red Y"),

-      png_fixed(png_ptr, green_x, "cHRM Green X"),

-      png_fixed(png_ptr, green_y, "cHRM Green Y"),

-      png_fixed(png_ptr, blue_x, "cHRM Blue X"),

-      png_fixed(png_ptr, blue_y, "cHRM Blue Y"));

-}

-

-void PNGAPI

-png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,

-    double red_Y, double red_Z, double green_X, double green_Y, double green_Z,

-    double blue_X, double blue_Y, double blue_Z)

-{

-   png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,

-      png_fixed(png_ptr, red_X, "cHRM Red X"),

-      png_fixed(png_ptr, red_Y, "cHRM Red Y"),

-      png_fixed(png_ptr, red_Z, "cHRM Red Z"),

-      png_fixed(png_ptr, green_X, "cHRM Red X"),

-      png_fixed(png_ptr, green_Y, "cHRM Red Y"),

-      png_fixed(png_ptr, green_Z, "cHRM Red Z"),

-      png_fixed(png_ptr, blue_X, "cHRM Red X"),

-      png_fixed(png_ptr, blue_Y, "cHRM Red Y"),

-      png_fixed(png_ptr, blue_Z, "cHRM Red Z"));

-}

-#  endif /* PNG_FLOATING_POINT_SUPPORTED */

-

-#endif /* PNG_cHRM_SUPPORTED */

-

-#ifdef PNG_gAMA_SUPPORTED

-void PNGFAPI

-png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_fixed_point file_gamma)

-{

-   png_debug1(1, "in %s storage function", "gAMA");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);

-   png_colorspace_sync_info(png_ptr, info_ptr);

-}

-

-#  ifdef PNG_FLOATING_POINT_SUPPORTED

-void PNGAPI

-png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)

-{

-   png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,

-       "png_set_gAMA"));

-}

-#  endif

-#endif

-

-#ifdef PNG_hIST_SUPPORTED

-void PNGAPI

-png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_const_uint_16p hist)

-{

-   int i;

-

-   png_debug1(1, "in %s storage function", "hIST");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   if (info_ptr->num_palette == 0 || info_ptr->num_palette

-       > PNG_MAX_PALETTE_LENGTH)

-   {

-      png_warning(png_ptr,

-          "Invalid palette size, hIST allocation skipped");

-

-      return;

-   }

-

-   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);

-

-   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in

-    * version 1.2.1

-    */

-   info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,

-       PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));

-

-   if (info_ptr->hist == NULL)

-   {

-      png_warning(png_ptr, "Insufficient memory for hIST chunk data");

-      return;

-   }

-

-   info_ptr->free_me |= PNG_FREE_HIST;

-

-   for (i = 0; i < info_ptr->num_palette; i++)

-      info_ptr->hist[i] = hist[i];

-

-   info_ptr->valid |= PNG_INFO_hIST;

-}

-#endif

-

-void PNGAPI

-png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_uint_32 width, png_uint_32 height, int bit_depth,

-    int color_type, int interlace_type, int compression_type,

-    int filter_type)

-{

-   png_debug1(1, "in %s storage function", "IHDR");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   info_ptr->width = width;

-   info_ptr->height = height;

-   info_ptr->bit_depth = (png_byte)bit_depth;

-   info_ptr->color_type = (png_byte)color_type;

-   info_ptr->compression_type = (png_byte)compression_type;

-   info_ptr->filter_type = (png_byte)filter_type;

-   info_ptr->interlace_type = (png_byte)interlace_type;

-

-   png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,

-       info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,

-       info_ptr->compression_type, info_ptr->filter_type);

-

-   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)

-      info_ptr->channels = 1;

-

-   else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)

-      info_ptr->channels = 3;

-

-   else

-      info_ptr->channels = 1;

-

-   if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)

-      info_ptr->channels++;

-

-   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);

-

-   info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);

-}

-

-#ifdef PNG_oFFs_SUPPORTED

-void PNGAPI

-png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_int_32 offset_x, png_int_32 offset_y, int unit_type)

-{

-   png_debug1(1, "in %s storage function", "oFFs");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   info_ptr->x_offset = offset_x;

-   info_ptr->y_offset = offset_y;

-   info_ptr->offset_unit_type = (png_byte)unit_type;

-   info_ptr->valid |= PNG_INFO_oFFs;

-}

-#endif

-

-#ifdef PNG_pCAL_SUPPORTED

-void PNGAPI

-png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,

-    int nparams, png_const_charp units, png_charpp params)

-{

-   png_size_t length;

-   int i;

-

-   png_debug1(1, "in %s storage function", "pCAL");

-

-   if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL

-      || (nparams > 0 && params == NULL))

-      return;

-

-   length = strlen(purpose) + 1;

-   png_debug1(3, "allocating purpose for info (%lu bytes)",

-       (unsigned long)length);

-

-   /* TODO: validate format of calibration name and unit name */

-

-   /* Check that the type matches the specification. */

-   if (type < 0 || type > 3)

-      png_error(png_ptr, "Invalid pCAL equation type");

-

-   if (nparams < 0 || nparams > 255)

-      png_error(png_ptr, "Invalid pCAL parameter count");

-

-   /* Validate params[nparams] */

-   for (i=0; i<nparams; ++i)

-      if (params[i] == NULL ||

-         !png_check_fp_string(params[i], strlen(params[i])))

-         png_error(png_ptr, "Invalid format for pCAL parameter");

-

-   info_ptr->pcal_purpose = png_voidcast(png_charp,

-      png_malloc_warn(png_ptr, length));

-

-   if (info_ptr->pcal_purpose == NULL)

-   {

-      png_warning(png_ptr, "Insufficient memory for pCAL purpose");

-      return;

-   }

-

-   memcpy(info_ptr->pcal_purpose, purpose, length);

-

-   png_debug(3, "storing X0, X1, type, and nparams in info");

-   info_ptr->pcal_X0 = X0;

-   info_ptr->pcal_X1 = X1;

-   info_ptr->pcal_type = (png_byte)type;

-   info_ptr->pcal_nparams = (png_byte)nparams;

-

-   length = strlen(units) + 1;

-   png_debug1(3, "allocating units for info (%lu bytes)",

-     (unsigned long)length);

-

-   info_ptr->pcal_units = png_voidcast(png_charp,

-      png_malloc_warn(png_ptr, length));

-

-   if (info_ptr->pcal_units == NULL)

-   {

-      png_warning(png_ptr, "Insufficient memory for pCAL units");

-      return;

-   }

-

-   memcpy(info_ptr->pcal_units, units, length);

-

-   info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,

-       (png_size_t)((nparams + 1) * (sizeof (png_charp)))));

-

-   if (info_ptr->pcal_params == NULL)

-   {

-      png_warning(png_ptr, "Insufficient memory for pCAL params");

-      return;

-   }

-

-   memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));

-

-   for (i = 0; i < nparams; i++)

-   {

-      length = strlen(params[i]) + 1;

-      png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,

-          (unsigned long)length);

-

-      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);

-

-      if (info_ptr->pcal_params[i] == NULL)

-      {

-         png_warning(png_ptr, "Insufficient memory for pCAL parameter");

-         return;

-      }

-

-      memcpy(info_ptr->pcal_params[i], params[i], length);

-   }

-

-   info_ptr->valid |= PNG_INFO_pCAL;

-   info_ptr->free_me |= PNG_FREE_PCAL;

-}

-#endif

-

-#ifdef PNG_sCAL_SUPPORTED

-void PNGAPI

-png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,

-    int unit, png_const_charp swidth, png_const_charp sheight)

-{

-   png_size_t lengthw = 0, lengthh = 0;

-

-   png_debug1(1, "in %s storage function", "sCAL");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   /* Double check the unit (should never get here with an invalid

-    * unit unless this is an API call.)

-    */

-   if (unit != 1 && unit != 2)

-      png_error(png_ptr, "Invalid sCAL unit");

-

-   if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||

-       swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))

-      png_error(png_ptr, "Invalid sCAL width");

-

-   if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||

-       sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))

-      png_error(png_ptr, "Invalid sCAL height");

-

-   info_ptr->scal_unit = (png_byte)unit;

-

-   ++lengthw;

-

-   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);

-

-   info_ptr->scal_s_width = png_voidcast(png_charp,

-      png_malloc_warn(png_ptr, lengthw));

-

-   if (info_ptr->scal_s_width == NULL)

-   {

-      png_warning(png_ptr, "Memory allocation failed while processing sCAL");

-      return;

-   }

-

-   memcpy(info_ptr->scal_s_width, swidth, lengthw);

-

-   ++lengthh;

-

-   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);

-

-   info_ptr->scal_s_height = png_voidcast(png_charp,

-      png_malloc_warn(png_ptr, lengthh));

-

-   if (info_ptr->scal_s_height == NULL)

-   {

-      png_free (png_ptr, info_ptr->scal_s_width);

-      info_ptr->scal_s_width = NULL;

-

-      png_warning(png_ptr, "Memory allocation failed while processing sCAL");

-      return;

-   }

-

-   memcpy(info_ptr->scal_s_height, sheight, lengthh);

-

-   info_ptr->valid |= PNG_INFO_sCAL;

-   info_ptr->free_me |= PNG_FREE_SCAL;

-}

-

-#  ifdef PNG_FLOATING_POINT_SUPPORTED

-void PNGAPI

-png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,

-    double width, double height)

-{

-   png_debug1(1, "in %s storage function", "sCAL");

-

-   /* Check the arguments. */

-   if (width <= 0)

-      png_warning(png_ptr, "Invalid sCAL width ignored");

-

-   else if (height <= 0)

-      png_warning(png_ptr, "Invalid sCAL height ignored");

-

-   else

-   {

-      /* Convert 'width' and 'height' to ASCII. */

-      char swidth[PNG_sCAL_MAX_DIGITS+1];

-      char sheight[PNG_sCAL_MAX_DIGITS+1];

-

-      png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,

-         PNG_sCAL_PRECISION);

-      png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,

-         PNG_sCAL_PRECISION);

-

-      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);

-   }

-}

-#  endif

-

-#  ifdef PNG_FIXED_POINT_SUPPORTED

-void PNGAPI

-png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,

-    png_fixed_point width, png_fixed_point height)

-{

-   png_debug1(1, "in %s storage function", "sCAL");

-

-   /* Check the arguments. */

-   if (width <= 0)

-      png_warning(png_ptr, "Invalid sCAL width ignored");

-

-   else if (height <= 0)

-      png_warning(png_ptr, "Invalid sCAL height ignored");

-

-   else

-   {

-      /* Convert 'width' and 'height' to ASCII. */

-      char swidth[PNG_sCAL_MAX_DIGITS+1];

-      char sheight[PNG_sCAL_MAX_DIGITS+1];

-

-      png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);

-      png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);

-

-      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);

-   }

-}

-#  endif

-#endif

-

-#ifdef PNG_pHYs_SUPPORTED

-void PNGAPI

-png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_uint_32 res_x, png_uint_32 res_y, int unit_type)

-{

-   png_debug1(1, "in %s storage function", "pHYs");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   info_ptr->x_pixels_per_unit = res_x;

-   info_ptr->y_pixels_per_unit = res_y;

-   info_ptr->phys_unit_type = (png_byte)unit_type;

-   info_ptr->valid |= PNG_INFO_pHYs;

-}

-#endif

-

-void PNGAPI

-png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,

-    png_const_colorp palette, int num_palette)

-{

-

-   png_debug1(1, "in %s storage function", "PLTE");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)

-   {

-      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)

-         png_error(png_ptr, "Invalid palette length");

-

-      else

-      {

-         png_warning(png_ptr, "Invalid palette length");

-         return;

-      }

-   }

-

-   if ((num_palette > 0 && palette == NULL) ||

-      (num_palette == 0

-#        ifdef PNG_MNG_FEATURES_SUPPORTED

-            && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0

-#        endif

-      ))

-   {

-      png_chunk_report(png_ptr, "Invalid palette", PNG_CHUNK_ERROR);

-      return;

-   }

-

-   /* It may not actually be necessary to set png_ptr->palette here;

-    * we do it for backward compatibility with the way the png_handle_tRNS

-    * function used to do the allocation.

-    *

-    * 1.6.0: the above statement appears to be incorrect; something has to set

-    * the palette inside png_struct on read.

-    */

-   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);

-

-   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead

-    * of num_palette entries, in case of an invalid PNG file that has

-    * too-large sample values.

-    */

-   png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,

-       PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));

-

-   if (num_palette > 0)

-      memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));

-   info_ptr->palette = png_ptr->palette;

-   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;

-

-   info_ptr->free_me |= PNG_FREE_PLTE;

-

-   info_ptr->valid |= PNG_INFO_PLTE;

-}

-

-#ifdef PNG_sBIT_SUPPORTED

-void PNGAPI

-png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_const_color_8p sig_bit)

-{

-   png_debug1(1, "in %s storage function", "sBIT");

-

-   if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)

-      return;

-

-   info_ptr->sig_bit = *sig_bit;

-   info_ptr->valid |= PNG_INFO_sBIT;

-}

-#endif

-

-#ifdef PNG_sRGB_SUPPORTED

-void PNGAPI

-png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)

-{

-   png_debug1(1, "in %s storage function", "sRGB");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);

-   png_colorspace_sync_info(png_ptr, info_ptr);

-}

-

-void PNGAPI

-png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,

-    int srgb_intent)

-{

-   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent))

-   {

-      /* This causes the gAMA and cHRM to be written too */

-      info_ptr->colorspace.flags |=

-         PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;

-   }

-

-   png_colorspace_sync_info(png_ptr, info_ptr);

-}

-#endif /* sRGB */

-

-

-#ifdef PNG_iCCP_SUPPORTED

-void PNGAPI

-png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_const_charp name, int compression_type,

-    png_const_bytep profile, png_uint_32 proflen)

-{

-   png_charp new_iccp_name;

-   png_bytep new_iccp_profile;

-   png_size_t length;

-

-   png_debug1(1, "in %s storage function", "iCCP");

-

-   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)

-      return;

-

-   if (compression_type != PNG_COMPRESSION_TYPE_BASE)

-      png_app_error(png_ptr, "Invalid iCCP compression method");

-

-   /* Set the colorspace first because this validates the profile; do not

-    * override previously set app cHRM or gAMA here (because likely as not the

-    * application knows better than libpng what the correct values are.)  Pass

-    * the info_ptr color_type field to png_colorspace_set_ICC because in the

-    * write case it has not yet been stored in png_ptr.

-    */

-   {

-      int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,

-         proflen, profile, info_ptr->color_type);

-

-      png_colorspace_sync_info(png_ptr, info_ptr);

-

-      /* Don't do any of the copying if the profile was bad, or inconsistent. */

-      if (!result)

-         return;

-

-      /* But do write the gAMA and cHRM chunks from the profile. */

-      info_ptr->colorspace.flags |=

-         PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;

-   }

-

-   length = strlen(name)+1;

-   new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));

-

-   if (new_iccp_name == NULL)

-   {

-      png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");

-      return;

-   }

-

-   memcpy(new_iccp_name, name, length);

-   new_iccp_profile = png_voidcast(png_bytep,

-      png_malloc_warn(png_ptr, proflen));

-

-   if (new_iccp_profile == NULL)

-   {

-      png_free(png_ptr, new_iccp_name);

-      png_benign_error(png_ptr,

-          "Insufficient memory to process iCCP profile");

-      return;

-   }

-

-   memcpy(new_iccp_profile, profile, proflen);

-

-   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);

-

-   info_ptr->iccp_proflen = proflen;

-   info_ptr->iccp_name = new_iccp_name;

-   info_ptr->iccp_profile = new_iccp_profile;

-   info_ptr->free_me |= PNG_FREE_ICCP;

-   info_ptr->valid |= PNG_INFO_iCCP;

-}

-#endif

-

-#ifdef PNG_TEXT_SUPPORTED

-void PNGAPI

-png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_const_textp text_ptr, int num_text)

-{

-   int ret;

-   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);

-

-   if (ret)

-      png_error(png_ptr, "Insufficient memory to store text");

-}

-

-int /* PRIVATE */

-png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_const_textp text_ptr, int num_text)

-{

-   int i;

-

-   png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" :

-      (unsigned long)png_ptr->chunk_name);

-

-   if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)

-      return(0);

-

-   /* Make sure we have enough space in the "text" array in info_struct

-    * to hold all of the incoming text_ptr objects.  This compare can't overflow

-    * because max_text >= num_text (anyway, subtract of two positive integers

-    * can't overflow in any case.)

-    */

-   if (num_text > info_ptr->max_text - info_ptr->num_text)

-   {

-      int old_num_text = info_ptr->num_text;

-      int max_text;

-      png_textp new_text = NULL;

-

-      /* Calculate an appropriate max_text, checking for overflow. */

-      max_text = old_num_text;

-      if (num_text <= INT_MAX - max_text)

-      {

-         max_text += num_text;

-

-         /* Round up to a multiple of 8 */

-         if (max_text < INT_MAX-8)

-            max_text = (max_text + 8) & ~0x7;

-

-         else

-            max_text = INT_MAX;

-

-         /* Now allocate a new array and copy the old members in, this does all

-          * the overflow checks.

-          */

-         new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,

-            info_ptr->text, old_num_text, max_text-old_num_text,

-            sizeof *new_text));

-      }

-

-      if (new_text == NULL)

-      {

-         png_chunk_report(png_ptr, "too many text chunks",

-            PNG_CHUNK_WRITE_ERROR);

-         return 1;

-      }

-

-      png_free(png_ptr, info_ptr->text);

-

-      info_ptr->text = new_text;

-      info_ptr->free_me |= PNG_FREE_TEXT;

-      info_ptr->max_text = max_text;

-      /* num_text is adjusted below as the entries are copied in */

-

-      png_debug1(3, "allocated %d entries for info_ptr->text", max_text);

-   }

-

-   for (i = 0; i < num_text; i++)

-   {

-      size_t text_length, key_len;

-      size_t lang_len, lang_key_len;

-      png_textp textp = &(info_ptr->text[info_ptr->num_text]);

-

-      if (text_ptr[i].key == NULL)

-          continue;

-

-      if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||

-          text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)

-      {

-         png_chunk_report(png_ptr, "text compression mode is out of range",

-            PNG_CHUNK_WRITE_ERROR);

-         continue;

-      }

-

-      key_len = strlen(text_ptr[i].key);

-

-      if (text_ptr[i].compression <= 0)

-      {

-         lang_len = 0;

-         lang_key_len = 0;

-      }

-

-      else

-#  ifdef PNG_iTXt_SUPPORTED

-      {

-         /* Set iTXt data */

-

-         if (text_ptr[i].lang != NULL)

-            lang_len = strlen(text_ptr[i].lang);

-

-         else

-            lang_len = 0;

-

-         if (text_ptr[i].lang_key != NULL)

-            lang_key_len = strlen(text_ptr[i].lang_key);

-

-         else

-            lang_key_len = 0;

-      }

-#  else /* PNG_iTXt_SUPPORTED */

-      {

-         png_chunk_report(png_ptr, "iTXt chunk not supported",

-            PNG_CHUNK_WRITE_ERROR);

-         continue;

-      }

-#  endif

-

-      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')

-      {

-         text_length = 0;

-#  ifdef PNG_iTXt_SUPPORTED

-         if (text_ptr[i].compression > 0)

-            textp->compression = PNG_ITXT_COMPRESSION_NONE;

-

-         else

-#  endif

-            textp->compression = PNG_TEXT_COMPRESSION_NONE;

-      }

-

-      else

-      {

-         text_length = strlen(text_ptr[i].text);

-         textp->compression = text_ptr[i].compression;

-      }

-

-      textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,

-          key_len + text_length + lang_len + lang_key_len + 4));

-

-      if (textp->key == NULL)

-      {

-         png_chunk_report(png_ptr, "text chunk: out of memory",

-               PNG_CHUNK_WRITE_ERROR);

-         return 1;

-      }

-

-      png_debug2(2, "Allocated %lu bytes at %p in png_set_text",

-          (unsigned long)(png_uint_32)

-          (key_len + lang_len + lang_key_len + text_length + 4),

-          textp->key);

-

-      memcpy(textp->key, text_ptr[i].key, key_len);

-      *(textp->key + key_len) = '\0';

-

-      if (text_ptr[i].compression > 0)

-      {

-         textp->lang = textp->key + key_len + 1;

-         memcpy(textp->lang, text_ptr[i].lang, lang_len);

-         *(textp->lang + lang_len) = '\0';

-         textp->lang_key = textp->lang + lang_len + 1;

-         memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);

-         *(textp->lang_key + lang_key_len) = '\0';

-         textp->text = textp->lang_key + lang_key_len + 1;

-      }

-

-      else

-      {

-         textp->lang=NULL;

-         textp->lang_key=NULL;

-         textp->text = textp->key + key_len + 1;

-      }

-

-      if (text_length)

-         memcpy(textp->text, text_ptr[i].text, text_length);

-

-      *(textp->text + text_length) = '\0';

-

-#  ifdef PNG_iTXt_SUPPORTED

-      if (textp->compression > 0)

-      {

-         textp->text_length = 0;

-         textp->itxt_length = text_length;

-      }

-

-      else

-#  endif

-      {

-         textp->text_length = text_length;

-         textp->itxt_length = 0;

-      }

-

-      info_ptr->num_text++;

-      png_debug1(3, "transferred text chunk %d", info_ptr->num_text);

-   }

-

-   return(0);

-}

-#endif

-

-#ifdef PNG_tIME_SUPPORTED

-void PNGAPI

-png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_const_timep mod_time)

-{

-   png_debug1(1, "in %s storage function", "tIME");

-

-   if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||

-       (png_ptr->mode & PNG_WROTE_tIME))

-      return;

-

-   if (mod_time->month == 0   || mod_time->month > 12  ||

-       mod_time->day   == 0   || mod_time->day   > 31  ||

-       mod_time->hour  > 23   || mod_time->minute > 59 ||

-       mod_time->second > 60)

-   {

-      png_warning(png_ptr, "Ignoring invalid time value");

-      return;

-   }

-

-   info_ptr->mod_time = *mod_time;

-   info_ptr->valid |= PNG_INFO_tIME;

-}

-#endif

-

-#ifdef PNG_tRNS_SUPPORTED

-void PNGAPI

-png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,

-    png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)

-{

-   png_debug1(1, "in %s storage function", "tRNS");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   if (trans_alpha != NULL)

-   {

-       /* It may not actually be necessary to set png_ptr->trans_alpha here;

-        * we do it for backward compatibility with the way the png_handle_tRNS

-        * function used to do the allocation.

-        *

-        * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively

-        * relies on png_set_tRNS storing the information in png_struct

-        * (otherwise it won't be there for the code in pngrtran.c).

-        */

-

-       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);

-

-       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */

-       png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,

-         png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));

-

-       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)

-          memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);

-   }

-

-   if (trans_color != NULL)

-   {

-      int sample_max = (1 << info_ptr->bit_depth);

-

-      if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&

-          trans_color->gray > sample_max) ||

-          (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&

-          (trans_color->red > sample_max ||

-          trans_color->green > sample_max ||

-          trans_color->blue > sample_max)))

-         png_warning(png_ptr,

-            "tRNS chunk has out-of-range samples for bit_depth");

-

-      info_ptr->trans_color = *trans_color;

-

-      if (num_trans == 0)

-         num_trans = 1;

-   }

-

-   info_ptr->num_trans = (png_uint_16)num_trans;

-

-   if (num_trans != 0)

-   {

-      info_ptr->valid |= PNG_INFO_tRNS;

-      info_ptr->free_me |= PNG_FREE_TRNS;

-   }

-}

-#endif

-

-#ifdef PNG_sPLT_SUPPORTED

-void PNGAPI

-png_set_sPLT(png_const_structrp png_ptr,

-    png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)

-/*

- *  entries        - array of png_sPLT_t structures

- *                   to be added to the list of palettes

- *                   in the info structure.

- *

- *  nentries       - number of palette structures to be

- *                   added.

- */

-{

-   png_sPLT_tp np;

-

-   if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)

-      return;

-

-   /* Use the internal realloc function, which checks for all the possible

-    * overflows.  Notice that the parameters are (int) and (size_t)

-    */

-   np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,

-      info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,

-      sizeof *np));

-

-   if (np == NULL)

-   {

-      /* Out of memory or too many chunks */

-      png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);

-      return;

-   }

-

-   png_free(png_ptr, info_ptr->splt_palettes);

-   info_ptr->splt_palettes = np;

-   info_ptr->free_me |= PNG_FREE_SPLT;

-

-   np += info_ptr->splt_palettes_num;

-

-   do

-   {

-      png_size_t length;

-

-      /* Skip invalid input entries */

-      if (entries->name == NULL || entries->entries == NULL)

-      {

-         /* png_handle_sPLT doesn't do this, so this is an app error */

-         png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");

-         /* Just skip the invalid entry */

-         continue;

-      }

-

-      np->depth = entries->depth;

-

-      /* In the even of out-of-memory just return - there's no point keeping on

-       * trying to add sPLT chunks.

-       */

-      length = strlen(entries->name) + 1;

-      np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));

-

-      if (np->name == NULL)

-         break;

-

-      memcpy(np->name, entries->name, length);

-

-      /* IMPORTANT: we have memory now that won't get freed if something else

-       * goes wrong, this code must free it.  png_malloc_array produces no

-       * warnings, use a png_chunk_report (below) if there is an error.

-       */

-      np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,

-          entries->nentries, sizeof (png_sPLT_entry)));

-

-      if (np->entries == NULL)

-      {

-         png_free(png_ptr, np->name);

-         break;

-      }

-

-      np->nentries = entries->nentries;

-      /* This multiply can't overflow because png_malloc_array has already

-       * checked it when doing the allocation.

-       */

-      memcpy(np->entries, entries->entries,

-         entries->nentries * sizeof (png_sPLT_entry));

-

-      /* Note that 'continue' skips the advance of the out pointer and out

-       * count, so an invalid entry is not added.

-       */

-      info_ptr->valid |= PNG_INFO_sPLT;

-      ++(info_ptr->splt_palettes_num);

-      ++np;

-   }

-   while (++entries, --nentries);

-

-   if (nentries > 0)

-      png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);

-}

-#endif /* PNG_sPLT_SUPPORTED */

-

-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED

-static png_byte

-check_location(png_const_structrp png_ptr, int location)

-{

-   location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);

-

-   /* New in 1.6.0; copy the location and check it.  This is an API

-    * change, previously the app had to use the

-    * png_set_unknown_chunk_location API below for each chunk.

-    */

-   if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT))

-   {

-      /* Write struct, so unknown chunks come from the app */

-      png_app_warning(png_ptr,

-         "png_set_unknown_chunks now expects a valid location");

-      /* Use the old behavior */

-      location = (png_byte)(png_ptr->mode &

-         (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));

-   }

-

-   /* This need not be an internal error - if the app calls

-    * png_set_unknown_chunks on a read pointer it must get the location right.

-    */

-   if (location == 0)

-      png_error(png_ptr, "invalid location in png_set_unknown_chunks");

-

-   /* Now reduce the location to the top-most set bit by removing each least

-    * significant bit in turn.

-    */

-   while (location != (location & -location))

-      location &= ~(location & -location);

-

-   /* The cast is safe because 'location' is a bit mask and only the low four

-    * bits are significant.

-    */

-   return (png_byte)location;

-}

-

-void PNGAPI

-png_set_unknown_chunks(png_const_structrp png_ptr,

-   png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)

-{

-   png_unknown_chunkp np;

-

-   if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||

-      unknowns == NULL)

-      return;

-

-   /* Check for the failure cases where support has been disabled at compile

-    * time.  This code is hardly ever compiled - it's here because

-    * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this

-    * code) but may be meaningless if the read or write handling of unknown

-    * chunks is not compiled in.

-    */

-#  if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \

-      defined(PNG_READ_SUPPORTED)

-      if (png_ptr->mode & PNG_IS_READ_STRUCT)

-      {

-         png_app_error(png_ptr, "no unknown chunk support on read");

-         return;

-      }

-#  endif

-#  if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \

-      defined(PNG_WRITE_SUPPORTED)

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

-      {

-         png_app_error(png_ptr, "no unknown chunk support on write");

-         return;

-      }

-#  endif

-

-   /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that

-    * unknown critical chunks could be lost with just a warning resulting in

-    * undefined behavior.  Now png_chunk_report is used to provide behavior

-    * appropriate to read or write.

-    */

-   np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,

-         info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,

-         sizeof *np));

-

-   if (np == NULL)

-   {

-      png_chunk_report(png_ptr, "too many unknown chunks",

-         PNG_CHUNK_WRITE_ERROR);

-      return;

-   }

-

-   png_free(png_ptr, info_ptr->unknown_chunks);

-   info_ptr->unknown_chunks = np; /* safe because it is initialized */

-   info_ptr->free_me |= PNG_FREE_UNKN;

-

-   np += info_ptr->unknown_chunks_num;

-

-   /* Increment unknown_chunks_num each time round the loop to protect the

-    * just-allocated chunk data.

-    */

-   for (; num_unknowns > 0; --num_unknowns, ++unknowns)

-   {

-      memcpy(np->name, unknowns->name, (sizeof np->name));

-      np->name[(sizeof np->name)-1] = '\0';

-      np->location = check_location(png_ptr, unknowns->location);

-

-      if (unknowns->size == 0)

-      {

-         np->data = NULL;

-         np->size = 0;

-      }

-

-      else

-      {

-         np->data = png_voidcast(png_bytep,

-            png_malloc_base(png_ptr, unknowns->size));

-

-         if (np->data == NULL)

-         {

-            png_chunk_report(png_ptr, "unknown chunk: out of memory",

-               PNG_CHUNK_WRITE_ERROR);

-            /* But just skip storing the unknown chunk */

-            continue;

-         }

-

-         memcpy(np->data, unknowns->data, unknowns->size);

-         np->size = unknowns->size;

-      }

-

-      /* These increments are skipped on out-of-memory for the data - the

-       * unknown chunk entry gets overwritten if the png_chunk_report returns.

-       * This is correct in the read case (the chunk is just dropped.)

-       */

-      ++np;

-      ++(info_ptr->unknown_chunks_num);

-   }

-}

-

-void PNGAPI

-png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,

-    int chunk, int location)

-{

-   /* This API is pretty pointless in 1.6.0 because the location can be set

-    * before the call to png_set_unknown_chunks.

-    *

-    * TODO: add a png_app_warning in 1.7

-    */

-   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&

-      chunk < info_ptr->unknown_chunks_num)

-   {

-      if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)

-      {

-         png_app_error(png_ptr, "invalid unknown chunk location");

-         /* Fake out the pre 1.6.0 behavior: */

-         if ((location & PNG_HAVE_IDAT)) /* undocumented! */

-            location = PNG_AFTER_IDAT;

-

-         else

-            location = PNG_HAVE_IHDR; /* also undocumented */

-      }

-

-      info_ptr->unknown_chunks[chunk].location =

-         check_location(png_ptr, location);

-   }

-}

-#endif

-

-

-#ifdef PNG_MNG_FEATURES_SUPPORTED

-png_uint_32 PNGAPI

-png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)

-{

-   png_debug(1, "in png_permit_mng_features");

-

-   if (png_ptr == NULL)

-      return 0;

-

-   png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;

-

-   return png_ptr->mng_features_permitted;

-}

-#endif

-

-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED

-static unsigned int

-add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)

-{

-   unsigned int i;

-

-   /* Utility function: update the 'keep' state of a chunk if it is already in

-    * the list, otherwise add it to the list.

-    */

-   for (i=0; i<count; ++i, list += 5) if (memcmp(list, add, 4) == 0)

-   {

-      list[4] = (png_byte)keep;

-      return count;

-   }

-

-   if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)

-   {

-      ++count;

-      memcpy(list, add, 4);

-      list[4] = (png_byte)keep;

-   }

-

-   return count;

-}

-

-void PNGAPI

-png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,

-    png_const_bytep chunk_list, int num_chunks_in)

-{

-   png_bytep new_list;

-   unsigned int num_chunks, old_num_chunks;

-

-   if (png_ptr == NULL)

-      return;

-

-   if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)

-   {

-      png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");

-      return;

-   }

-

-   if (num_chunks_in <= 0)

-   {

-      png_ptr->unknown_default = keep;

-

-      /* '0' means just set the flags, so stop here */

-      if (num_chunks_in == 0)

-        return;

-   }

-

-   if (num_chunks_in < 0)

-   {

-      /* Ignore all unknown chunks and all chunks recognized by

-       * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND

-       */

-      static PNG_CONST png_byte chunks_to_ignore[] = {

-         98,  75,  71,  68, '\0',  /* bKGD */

-         99,  72,  82,  77, '\0',  /* cHRM */

-        103,  65,  77,  65, '\0',  /* gAMA */

-        104,  73,  83,  84, '\0',  /* hIST */

-        105,  67,  67,  80, '\0',  /* iCCP */

-        105,  84,  88, 116, '\0',  /* iTXt */

-        111,  70,  70, 115, '\0',  /* oFFs */

-        112,  67,  65,  76, '\0',  /* pCAL */

-        112,  72,  89, 115, '\0',  /* pHYs */

-        115,  66,  73,  84, '\0',  /* sBIT */

-        115,  67,  65,  76, '\0',  /* sCAL */

-        115,  80,  76,  84, '\0',  /* sPLT */

-        115,  84,  69,  82, '\0',  /* sTER */

-        115,  82,  71,  66, '\0',  /* sRGB */

-        116,  69,  88, 116, '\0',  /* tEXt */

-        116,  73,  77,  69, '\0',  /* tIME */

-        122,  84,  88, 116, '\0'   /* zTXt */

-      };

-

-      chunk_list = chunks_to_ignore;

-      num_chunks = (sizeof chunks_to_ignore)/5;

-   }

-

-   else /* num_chunks_in > 0 */

-   {

-      if (chunk_list == NULL)

-      {

-         /* Prior to 1.6.0 this was silently ignored, now it is an app_error

-          * which can be switched off.

-          */

-         png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");

-         return;

-      }

-

-      num_chunks = num_chunks_in;

-   }

-

-   old_num_chunks = png_ptr->num_chunk_list;

-   if (png_ptr->chunk_list == NULL)

-      old_num_chunks = 0;

-

-   /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.

-    */

-   if (num_chunks + old_num_chunks > UINT_MAX/5)

-   {

-      png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");

-      return;

-   }

-

-   /* If these chunks are being reset to the default then no more memory is

-    * required because add_one_chunk above doesn't extend the list if the 'keep'

-    * parameter is the default.

-    */

-   if (keep)

-   {

-      new_list = png_voidcast(png_bytep, png_malloc(png_ptr,

-          5 * (num_chunks + old_num_chunks)));

-

-      if (old_num_chunks > 0)

-         memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);

-   }

-

-   else if (old_num_chunks > 0)

-      new_list = png_ptr->chunk_list;

-

-   else

-      new_list = NULL;

-

-   /* Add the new chunks together with each one's handling code.  If the chunk

-    * already exists the code is updated, otherwise the chunk is added to the

-    * end.  (In libpng 1.6.0 order no longer matters because this code enforces

-    * the earlier convention that the last setting is the one that is used.)

-    */

-   if (new_list != NULL)

-   {

-      png_const_bytep inlist;

-      png_bytep outlist;

-      unsigned int i;

-

-      for (i=0; i<num_chunks; ++i)

-         old_num_chunks = add_one_chunk(new_list, old_num_chunks,

-            chunk_list+5*i, keep);

-

-      /* Now remove any spurious 'default' entries. */

-      num_chunks = 0;

-      for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)

-         if (inlist[4])

-         {

-            if (outlist != inlist)

-               memcpy(outlist, inlist, 5);

-            outlist += 5;

-            ++num_chunks;

-         }

-

-      /* This means the application has removed all the specialized handling. */

-      if (num_chunks == 0)

-      {

-         if (png_ptr->chunk_list != new_list)

-            png_free(png_ptr, new_list);

-

-         new_list = NULL;

-      }

-   }

-

-   else

-      num_chunks = 0;

-

-   png_ptr->num_chunk_list = num_chunks;

-

-   if (png_ptr->chunk_list != new_list)

-   {

-      if (png_ptr->chunk_list != NULL)

-         png_free(png_ptr, png_ptr->chunk_list);

-

-      png_ptr->chunk_list = new_list;

-   }

-}

-#endif

-

-#ifdef PNG_READ_USER_CHUNKS_SUPPORTED

-void PNGAPI

-png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,

-    png_user_chunk_ptr read_user_chunk_fn)

-{

-   png_debug(1, "in png_set_read_user_chunk_fn");

-

-   if (png_ptr == NULL)

-      return;

-

-   png_ptr->read_user_chunk_fn = read_user_chunk_fn;

-   png_ptr->user_chunk_ptr = user_chunk_ptr;

-}

-#endif

-

-#ifdef PNG_INFO_IMAGE_SUPPORTED

-void PNGAPI

-png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,

-    png_bytepp row_pointers)

-{

-   png_debug1(1, "in %s storage function", "rows");

-

-   if (png_ptr == NULL || info_ptr == NULL)

-      return;

-

-   if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))

-      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);

-

-   info_ptr->row_pointers = row_pointers;

-

-   if (row_pointers)

-      info_ptr->valid |= PNG_INFO_IDAT;

-}

-#endif

-

-void PNGAPI

-png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)

-{

-    if (png_ptr == NULL)

-       return;

-

-    if (size == 0 || size > PNG_UINT_31_MAX)

-       png_error(png_ptr, "invalid compression buffer size");

-

-#  ifdef PNG_SEQUENTIAL_READ_SUPPORTED

-      if (png_ptr->mode & PNG_IS_READ_STRUCT)

-      {

-         png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */

-         return;

-      }

-#  endif

-

-#  ifdef PNG_WRITE_SUPPORTED

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

-      {

-         if (png_ptr->zowner != 0)

-         {

-            png_warning(png_ptr,

-              "Compression buffer size cannot be changed because it is in use");

-            return;

-         }

-

-         if (size > ZLIB_IO_MAX)

-         {

-            png_warning(png_ptr,

-               "Compression buffer size limited to system maximum");

-            size = ZLIB_IO_MAX; /* must fit */

-         }

-

-         else if (size < 6)

-         {

-            /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH

-             * if this is permitted.

-             */

-            png_warning(png_ptr,

-               "Compression buffer size cannot be reduced below 6");

-            return;

-         }

-

-         if (png_ptr->zbuffer_size != size)

-         {

-            png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);

-            png_ptr->zbuffer_size = (uInt)size;

-         }

-      }

-#  endif

-}

-

-void PNGAPI

-png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)

-{

-   if (png_ptr && info_ptr)

-      info_ptr->valid &= ~mask;

-}

-

-

-#ifdef PNG_SET_USER_LIMITS_SUPPORTED

-/* This function was added to libpng 1.2.6 */

-void PNGAPI

-png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,

-    png_uint_32 user_height_max)

-{

-   /* Images with dimensions larger than these limits will be

-    * rejected by png_set_IHDR().  To accept any PNG datastream

-    * regardless of dimensions, set both limits to 0x7ffffffL.

-    */

-   if (png_ptr == NULL)

-      return;

-

-   png_ptr->user_width_max = user_width_max;

-   png_ptr->user_height_max = user_height_max;

-}

-

-/* This function was added to libpng 1.4.0 */

-void PNGAPI

-png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)

-{

-    if (png_ptr)

-       png_ptr->user_chunk_cache_max = user_chunk_cache_max;

-}

-

-/* This function was added to libpng 1.4.1 */

-void PNGAPI

-png_set_chunk_malloc_max (png_structrp png_ptr,

-    png_alloc_size_t user_chunk_malloc_max)

-{

-   if (png_ptr)

-      png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;

-}

-#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */

-

-

-#ifdef PNG_BENIGN_ERRORS_SUPPORTED

-void PNGAPI

-png_set_benign_errors(png_structrp png_ptr, int allowed)

-{

-   png_debug(1, "in png_set_benign_errors");

-

-   /* If allowed is 1, png_benign_error() is treated as a warning.

-    *

-    * If allowed is 0, png_benign_error() is treated as an error (which

-    * is the default behavior if png_set_benign_errors() is not called).

-    */

-

-   if (allowed)

-      png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |

-         PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;

-

-   else

-      png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |

-         PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);

-}

-#endif /* PNG_BENIGN_ERRORS_SUPPORTED */

-

-#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED

-   /* Whether to report invalid palette index; added at libng-1.5.10.

-    * It is possible for an indexed (color-type==3) PNG file to contain

-    * pixels with invalid (out-of-range) indexes if the PLTE chunk has

-    * fewer entries than the image's bit-depth would allow. We recover

-    * from this gracefully by filling any incomplete palette with zeroes

-    * (opaque black).  By default, when this occurs libpng will issue

-    * a benign error.  This API can be used to override that behavior.

-    */

-void PNGAPI

-png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)

-{

-   png_debug(1, "in png_set_check_for_invalid_index");

-

-   if (allowed > 0)

-      png_ptr->num_palette_max = 0;

-

-   else

-      png_ptr->num_palette_max = -1;

-}

-#endif

-#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */