96b917056d
ignore all unknown chunks and all known chunks except for IHDR, PLTE, tRNS, IDAT, and IEND. Previously it only meant ignore all unknown chunks, the same as num_chunks == 0. Revised png_image_skip_unused_chunks() to provide a list of chunks to be processed instead of a list of chunks to ignore. Revised contrib/gregbook/readpng2.c accordingly.
1418 lines
40 KiB
C
1418 lines
40 KiB
C
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/* pngset.c - storage of image information into info struct
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*
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* Last changed in libpng 1.6.0 [(PENDING RELEASE)]
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* Copyright (c) 1998-2012 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*
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* The functions here are used during reads to store data from the file
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* into the info struct, and during writes to store application data
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* into the info struct for writing into the file. This abstracts the
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* info struct and allows us to change the structure in the future.
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*/
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#include "pngpriv.h"
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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#ifdef PNG_bKGD_SUPPORTED
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void PNGAPI
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png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
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png_const_color_16p background)
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{
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png_debug1(1, "in %s storage function", "bKGD");
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if (png_ptr == NULL || info_ptr == NULL || background == NULL)
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return;
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info_ptr->background = *background;
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info_ptr->valid |= PNG_INFO_bKGD;
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}
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#endif
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#ifdef PNG_cHRM_SUPPORTED
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void PNGFAPI
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png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
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png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
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png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
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png_fixed_point blue_x, png_fixed_point blue_y)
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{
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png_xy xy;
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png_debug1(1, "in %s storage function", "cHRM fixed");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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xy.redx = red_x;
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xy.redy = red_y;
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xy.greenx = green_x;
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xy.greeny = green_y;
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xy.bluex = blue_x;
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xy.bluey = blue_y;
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xy.whitex = white_x;
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xy.whitey = white_y;
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if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
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2/* override with app values*/))
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info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
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png_colorspace_sync_info(png_ptr, info_ptr);
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}
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void PNGFAPI
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png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
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png_fixed_point int_red_X, png_fixed_point int_red_Y,
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png_fixed_point int_red_Z, png_fixed_point int_green_X,
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png_fixed_point int_green_Y, png_fixed_point int_green_Z,
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png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
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png_fixed_point int_blue_Z)
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{
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png_XYZ XYZ;
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png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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XYZ.redX = int_red_X;
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XYZ.redY = int_red_Y;
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XYZ.redZ = int_red_Z;
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XYZ.greenX = int_green_X;
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XYZ.greenY = int_green_Y;
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XYZ.greenZ = int_green_Z;
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XYZ.blueX = int_blue_X;
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XYZ.blueY = int_blue_Y;
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XYZ.blueZ = int_blue_Z;
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if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, &XYZ, 2))
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info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
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png_colorspace_sync_info(png_ptr, info_ptr);
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}
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# ifdef PNG_FLOATING_POINT_SUPPORTED
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void PNGAPI
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png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
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double white_x, double white_y, double red_x, double red_y,
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double green_x, double green_y, double blue_x, double blue_y)
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{
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png_set_cHRM_fixed(png_ptr, info_ptr,
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png_fixed(png_ptr, white_x, "cHRM White X"),
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png_fixed(png_ptr, white_y, "cHRM White Y"),
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png_fixed(png_ptr, red_x, "cHRM Red X"),
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png_fixed(png_ptr, red_y, "cHRM Red Y"),
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png_fixed(png_ptr, green_x, "cHRM Green X"),
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png_fixed(png_ptr, green_y, "cHRM Green Y"),
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png_fixed(png_ptr, blue_x, "cHRM Blue X"),
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png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
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}
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void PNGAPI
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png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
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double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
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double blue_X, double blue_Y, double blue_Z)
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{
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png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
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png_fixed(png_ptr, red_X, "cHRM Red X"),
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png_fixed(png_ptr, red_Y, "cHRM Red Y"),
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png_fixed(png_ptr, red_Z, "cHRM Red Z"),
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png_fixed(png_ptr, green_X, "cHRM Red X"),
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png_fixed(png_ptr, green_Y, "cHRM Red Y"),
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png_fixed(png_ptr, green_Z, "cHRM Red Z"),
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png_fixed(png_ptr, blue_X, "cHRM Red X"),
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png_fixed(png_ptr, blue_Y, "cHRM Red Y"),
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png_fixed(png_ptr, blue_Z, "cHRM Red Z"));
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}
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# endif /* PNG_FLOATING_POINT_SUPPORTED */
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#endif /* PNG_cHRM_SUPPORTED */
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#ifdef PNG_gAMA_SUPPORTED
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void PNGFAPI
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png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
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png_fixed_point file_gamma)
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{
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png_debug1(1, "in %s storage function", "gAMA");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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/* Changed in libpng-1.5.4 to limit the values to ensure overflow can't
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* occur. Since the fixed point representation is assymetrical it is
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* possible for 1/gamma to overflow the limit of 21474 and this means the
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* gamma value must be at least 5/100000 and hence at most 20000.0. For
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* safety the limits here are a little narrower. The values are 0.00016 to
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* 6250.0, which are truly ridiculous gamma values (and will produce
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* displays that are all black or all white.)
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*/
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if (file_gamma < 16 || file_gamma > 625000000)
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png_app_error(png_ptr, "Out of range gamma value ignored");
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else
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{
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if (png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma,
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2/* overrided with app value */))
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info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_gAMA;
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png_colorspace_sync_info(png_ptr, info_ptr);
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}
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}
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# ifdef PNG_FLOATING_POINT_SUPPORTED
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void PNGAPI
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png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
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{
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png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
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"png_set_gAMA"));
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}
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# endif
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#endif
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#ifdef PNG_hIST_SUPPORTED
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void PNGAPI
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png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
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png_const_uint_16p hist)
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{
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int i;
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png_debug1(1, "in %s storage function", "hIST");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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if (info_ptr->num_palette == 0 || info_ptr->num_palette
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> PNG_MAX_PALETTE_LENGTH)
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{
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png_warning(png_ptr,
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"Invalid palette size, hIST allocation skipped");
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return;
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}
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png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
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/* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
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* version 1.2.1
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*/
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info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
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PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)));
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if (info_ptr->hist == NULL)
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{
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png_warning(png_ptr, "Insufficient memory for hIST chunk data");
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return;
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}
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info_ptr->free_me |= PNG_FREE_HIST;
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for (i = 0; i < info_ptr->num_palette; i++)
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info_ptr->hist[i] = hist[i];
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info_ptr->valid |= PNG_INFO_hIST;
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}
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#endif
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void PNGAPI
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png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
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png_uint_32 width, png_uint_32 height, int bit_depth,
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int color_type, int interlace_type, int compression_type,
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int filter_type)
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{
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png_debug1(1, "in %s storage function", "IHDR");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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info_ptr->width = width;
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info_ptr->height = height;
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info_ptr->bit_depth = (png_byte)bit_depth;
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info_ptr->color_type = (png_byte)color_type;
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info_ptr->compression_type = (png_byte)compression_type;
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info_ptr->filter_type = (png_byte)filter_type;
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info_ptr->interlace_type = (png_byte)interlace_type;
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png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
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info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
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info_ptr->compression_type, info_ptr->filter_type);
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if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
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info_ptr->channels = 1;
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else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
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info_ptr->channels = 3;
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else
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info_ptr->channels = 1;
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if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
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info_ptr->channels++;
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info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
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/* Check for potential overflow */
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if (width >
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(PNG_UINT_32_MAX >> 3) /* 8-byte RRGGBBAA pixels */
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- 48 /* bigrowbuf hack */
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- 1 /* filter byte */
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- 7*8 /* rounding of width to multiple of 8 pixels */
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- 8) /* extra max_pixel_depth pad */
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info_ptr->rowbytes = 0;
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else
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info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
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}
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#ifdef PNG_oFFs_SUPPORTED
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void PNGAPI
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png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
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png_int_32 offset_x, png_int_32 offset_y, int unit_type)
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{
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png_debug1(1, "in %s storage function", "oFFs");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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info_ptr->x_offset = offset_x;
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info_ptr->y_offset = offset_y;
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info_ptr->offset_unit_type = (png_byte)unit_type;
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info_ptr->valid |= PNG_INFO_oFFs;
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}
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#endif
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#ifdef PNG_pCAL_SUPPORTED
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void PNGAPI
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png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
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png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
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int nparams, png_const_charp units, png_charpp params)
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{
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png_size_t length;
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int i;
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png_debug1(1, "in %s storage function", "pCAL");
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if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
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|| (nparams > 0 && params == NULL))
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return;
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length = png_strlen(purpose) + 1;
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png_debug1(3, "allocating purpose for info (%lu bytes)",
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(unsigned long)length);
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/* TODO: validate format of calibration name and unit name */
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/* Check that the type matches the specification. */
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if (type < 0 || type > 3)
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png_error(png_ptr, "Invalid pCAL equation type");
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if (nparams < 0 || nparams > 255)
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png_error(png_ptr, "Invalid pCAL parameter count");
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/* Validate params[nparams] */
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for (i=0; i<nparams; ++i)
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if (params[i] == NULL ||
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!png_check_fp_string(params[i], png_strlen(params[i])))
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png_error(png_ptr, "Invalid format for pCAL parameter");
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info_ptr->pcal_purpose = png_voidcast(png_charp,
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png_malloc_warn(png_ptr, length));
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if (info_ptr->pcal_purpose == NULL)
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{
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png_warning(png_ptr, "Insufficient memory for pCAL purpose");
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return;
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}
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png_memcpy(info_ptr->pcal_purpose, purpose, length);
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png_debug(3, "storing X0, X1, type, and nparams in info");
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info_ptr->pcal_X0 = X0;
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info_ptr->pcal_X1 = X1;
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info_ptr->pcal_type = (png_byte)type;
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info_ptr->pcal_nparams = (png_byte)nparams;
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length = png_strlen(units) + 1;
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png_debug1(3, "allocating units for info (%lu bytes)",
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(unsigned long)length);
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info_ptr->pcal_units = png_voidcast(png_charp,
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png_malloc_warn(png_ptr, length));
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if (info_ptr->pcal_units == NULL)
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{
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png_warning(png_ptr, "Insufficient memory for pCAL units");
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return;
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}
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png_memcpy(info_ptr->pcal_units, units, length);
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info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
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(png_size_t)((nparams + 1) * png_sizeof(png_charp))));
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if (info_ptr->pcal_params == NULL)
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{
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png_warning(png_ptr, "Insufficient memory for pCAL params");
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return;
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}
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png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp));
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for (i = 0; i < nparams; i++)
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{
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length = png_strlen(params[i]) + 1;
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png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
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(unsigned long)length);
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info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
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if (info_ptr->pcal_params[i] == NULL)
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{
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png_warning(png_ptr, "Insufficient memory for pCAL parameter");
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return;
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}
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png_memcpy(info_ptr->pcal_params[i], params[i], length);
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}
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info_ptr->valid |= PNG_INFO_pCAL;
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info_ptr->free_me |= PNG_FREE_PCAL;
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}
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#endif
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#ifdef PNG_sCAL_SUPPORTED
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void PNGAPI
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png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
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int unit, png_const_charp swidth, png_const_charp sheight)
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{
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png_size_t lengthw = 0, lengthh = 0;
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png_debug1(1, "in %s storage function", "sCAL");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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|
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/* Double check the unit (should never get here with an invalid
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* unit unless this is an API call.)
|
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*/
|
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if (unit != 1 && unit != 2)
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png_error(png_ptr, "Invalid sCAL unit");
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|
|
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if (swidth == NULL || (lengthw = png_strlen(swidth)) == 0 ||
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swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
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png_error(png_ptr, "Invalid sCAL width");
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if (sheight == NULL || (lengthh = png_strlen(sheight)) == 0 ||
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sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
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png_error(png_ptr, "Invalid sCAL height");
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info_ptr->scal_unit = (png_byte)unit;
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++lengthw;
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png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
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info_ptr->scal_s_width = png_voidcast(png_charp,
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png_malloc_warn(png_ptr, lengthw));
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|
|
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if (info_ptr->scal_s_width == NULL)
|
|
{
|
|
png_warning(png_ptr, "Memory allocation failed while processing sCAL");
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return;
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}
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png_memcpy(info_ptr->scal_s_width, swidth, lengthw);
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++lengthh;
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png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
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info_ptr->scal_s_height = png_voidcast(png_charp,
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png_malloc_warn(png_ptr, lengthh));
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|
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if (info_ptr->scal_s_height == NULL)
|
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{
|
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png_free (png_ptr, info_ptr->scal_s_width);
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info_ptr->scal_s_width = NULL;
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png_warning(png_ptr, "Memory allocation failed while processing sCAL");
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return;
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}
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png_memcpy(info_ptr->scal_s_height, sheight, lengthh);
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|
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info_ptr->valid |= PNG_INFO_sCAL;
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info_ptr->free_me |= PNG_FREE_SCAL;
|
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}
|
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|
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# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
void PNGAPI
|
|
png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
|
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double width, double height)
|
|
{
|
|
png_debug1(1, "in %s storage function", "sCAL");
|
|
|
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/* Check the arguments. */
|
|
if (width <= 0)
|
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png_warning(png_ptr, "Invalid sCAL width ignored");
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|
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else if (height <= 0)
|
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png_warning(png_ptr, "Invalid sCAL height ignored");
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|
|
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 || palette == 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;
|
|
}
|
|
}
|
|
|
|
/* 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 * png_sizeof(png_color)));
|
|
|
|
png_memcpy(png_ptr->palette, palette, num_palette * png_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,
|
|
2/* app value overrides*/);
|
|
|
|
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,
|
|
2/* app value overrides*/))
|
|
{
|
|
/* And cause 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.)
|
|
*/
|
|
{
|
|
int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
|
|
proflen, profile, 0/* do *not* override the app cHRM or gAMA */);
|
|
|
|
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 = png_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;
|
|
}
|
|
|
|
png_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;
|
|
}
|
|
|
|
png_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)
|
|
return(0);
|
|
|
|
/* Make sure we have enough space in the "text" array in info_struct
|
|
* to hold all of the incoming text_ptr objects.
|
|
*/
|
|
if (info_ptr->num_text + num_text > info_ptr->max_text)
|
|
{
|
|
int old_max_text = info_ptr->max_text;
|
|
int old_num_text = info_ptr->num_text;
|
|
|
|
if (info_ptr->text != NULL)
|
|
{
|
|
png_textp old_text;
|
|
|
|
info_ptr->max_text = info_ptr->num_text + num_text + 8;
|
|
old_text = info_ptr->text;
|
|
|
|
info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
|
|
(png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
|
|
|
|
if (info_ptr->text == NULL)
|
|
{
|
|
/* Restore to previous condition */
|
|
info_ptr->max_text = old_max_text;
|
|
info_ptr->text = old_text;
|
|
return(1);
|
|
}
|
|
|
|
png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max_text *
|
|
png_sizeof(png_text)));
|
|
png_free(png_ptr, old_text);
|
|
}
|
|
|
|
else
|
|
{
|
|
info_ptr->max_text = num_text + 8;
|
|
info_ptr->num_text = 0;
|
|
info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
|
|
(png_size_t)(info_ptr->max_text * png_sizeof(png_text)));
|
|
if (info_ptr->text == NULL)
|
|
{
|
|
/* Restore to previous condition */
|
|
info_ptr->num_text = old_num_text;
|
|
info_ptr->max_text = old_max_text;
|
|
return(1);
|
|
}
|
|
info_ptr->free_me |= PNG_FREE_TEXT;
|
|
}
|
|
|
|
png_debug1(3, "allocated %d entries for info_ptr->text",
|
|
info_ptr->max_text);
|
|
}
|
|
for (i = 0; i < num_text; i++)
|
|
{
|
|
png_size_t text_length, key_len;
|
|
png_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_warning(png_ptr, "text compression mode is out of range");
|
|
continue;
|
|
}
|
|
|
|
key_len = png_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 = png_strlen(text_ptr[i].lang);
|
|
|
|
else
|
|
lang_len = 0;
|
|
|
|
if (text_ptr[i].lang_key != NULL)
|
|
lang_key_len = png_strlen(text_ptr[i].lang_key);
|
|
|
|
else
|
|
lang_key_len = 0;
|
|
}
|
|
# else /* PNG_iTXt_SUPPORTED */
|
|
{
|
|
png_warning(png_ptr, "iTXt chunk not supported");
|
|
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 = png_strlen(text_ptr[i].text);
|
|
textp->compression = text_ptr[i].compression;
|
|
}
|
|
|
|
textp->key = (png_charp)png_malloc_warn(png_ptr,
|
|
(png_size_t)
|
|
(key_len + text_length + lang_len + lang_key_len + 4));
|
|
|
|
if (textp->key == NULL)
|
|
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);
|
|
|
|
png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len));
|
|
*(textp->key + key_len) = '\0';
|
|
|
|
if (text_ptr[i].compression > 0)
|
|
{
|
|
textp->lang = textp->key + key_len + 1;
|
|
png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
|
|
*(textp->lang + lang_len) = '\0';
|
|
textp->lang_key = textp->lang + lang_len + 1;
|
|
png_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)
|
|
png_memcpy(textp->text, text_ptr[i].text,
|
|
(png_size_t)(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)
|
|
png_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;
|
|
int i;
|
|
|
|
if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 ||
|
|
entries == NULL)
|
|
return;
|
|
|
|
np = png_voidcast(png_sPLT_tp, png_malloc_warn(png_ptr,
|
|
(info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t)));
|
|
|
|
if (np == NULL)
|
|
{
|
|
png_warning(png_ptr, "No memory for sPLT palettes");
|
|
return;
|
|
}
|
|
|
|
png_memcpy(np, info_ptr->splt_palettes,
|
|
info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
|
|
|
|
png_free(png_ptr, info_ptr->splt_palettes);
|
|
info_ptr->splt_palettes=NULL;
|
|
|
|
/* TODO: fix this, it apparently leaves NULL entries in the event of OOM
|
|
* below.
|
|
*/
|
|
for (i = 0; i < nentries; i++)
|
|
{
|
|
png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
|
|
png_const_sPLT_tp from = entries + i;
|
|
png_size_t length;
|
|
|
|
/* In event of error below the name and entries fields must be set to
|
|
* NULL, otherwise libpng will crash later on while trying to free the
|
|
* uninitialized pointers.
|
|
*/
|
|
png_memset(to, 0, sizeof *to);
|
|
|
|
if (from->name == NULL || from->entries == NULL)
|
|
continue;
|
|
|
|
length = png_strlen(from->name) + 1;
|
|
to->name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
|
|
|
|
if (to->name == NULL)
|
|
{
|
|
png_warning(png_ptr,
|
|
"Out of memory while processing sPLT chunk");
|
|
continue;
|
|
}
|
|
|
|
png_memcpy(to->name, from->name, length);
|
|
to->entries = png_voidcast(png_sPLT_entryp, png_malloc_warn(png_ptr,
|
|
from->nentries * png_sizeof(png_sPLT_entry)));
|
|
|
|
if (to->entries == NULL)
|
|
{
|
|
png_warning(png_ptr, "Out of memory while processing sPLT chunk");
|
|
png_free(png_ptr, to->name);
|
|
to->name = NULL;
|
|
continue;
|
|
}
|
|
|
|
png_memcpy(to->entries, from->entries,
|
|
from->nentries * png_sizeof(png_sPLT_entry));
|
|
|
|
to->nentries = from->nentries;
|
|
to->depth = from->depth;
|
|
}
|
|
|
|
info_ptr->splt_palettes = np;
|
|
info_ptr->splt_palettes_num += nentries;
|
|
info_ptr->valid |= PNG_INFO_sPLT;
|
|
info_ptr->free_me |= PNG_FREE_SPLT;
|
|
}
|
|
#endif /* PNG_sPLT_SUPPORTED */
|
|
|
|
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
|
|
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;
|
|
int i;
|
|
|
|
if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
|
|
return;
|
|
|
|
np = png_voidcast(png_unknown_chunkp, png_malloc_warn(png_ptr,
|
|
(png_size_t)(info_ptr->unknown_chunks_num + num_unknowns) *
|
|
png_sizeof(png_unknown_chunk)));
|
|
|
|
if (np == NULL)
|
|
{
|
|
png_warning(png_ptr,
|
|
"Out of memory while processing unknown chunk");
|
|
return;
|
|
}
|
|
|
|
png_memcpy(np, info_ptr->unknown_chunks,
|
|
(png_size_t)info_ptr->unknown_chunks_num *
|
|
png_sizeof(png_unknown_chunk));
|
|
|
|
png_free(png_ptr, info_ptr->unknown_chunks);
|
|
info_ptr->unknown_chunks = NULL;
|
|
|
|
for (i = 0; i < num_unknowns; i++)
|
|
{
|
|
png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
|
|
png_const_unknown_chunkp from = unknowns + i;
|
|
|
|
png_memcpy(to->name, from->name, png_sizeof(from->name));
|
|
to->name[png_sizeof(to->name)-1] = '\0';
|
|
to->size = from->size;
|
|
|
|
/* Note our location in the read or write sequence */
|
|
to->location = (png_byte)png_ptr->mode;
|
|
|
|
if (from->size == 0)
|
|
to->data=NULL;
|
|
|
|
else
|
|
{
|
|
to->data = (png_bytep)png_malloc_warn(png_ptr,
|
|
(png_size_t)from->size);
|
|
|
|
if (to->data == NULL)
|
|
{
|
|
png_warning(png_ptr,
|
|
"Out of memory while processing unknown chunk");
|
|
to->size = 0;
|
|
}
|
|
|
|
else
|
|
png_memcpy(to->data, from->data, from->size);
|
|
}
|
|
}
|
|
|
|
info_ptr->unknown_chunks = np;
|
|
info_ptr->unknown_chunks_num += num_unknowns;
|
|
info_ptr->free_me |= PNG_FREE_UNKN;
|
|
}
|
|
|
|
void PNGAPI
|
|
png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
int chunk, int location)
|
|
{
|
|
if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
|
|
info_ptr->unknown_chunks_num)
|
|
info_ptr->unknown_chunks[chunk].location = (png_byte)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
|
|
void PNGAPI
|
|
png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
|
|
png_const_bytep chunk_list, int num_chunksIn)
|
|
{
|
|
png_bytep new_list, p;
|
|
unsigned int i, num_chunks, old_num_chunks;
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
if (num_chunksIn <= 0)
|
|
{
|
|
if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
|
|
png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
|
|
|
|
else
|
|
png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
|
|
|
|
if (keep == PNG_HANDLE_CHUNK_ALWAYS)
|
|
png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
|
|
|
|
else
|
|
png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
|
|
|
|
if (num_chunksIn == 0)
|
|
return;
|
|
}
|
|
|
|
if (num_chunksIn < 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 = (unsigned int) sizeof(chunks_to_ignore)/5;
|
|
}
|
|
|
|
if (chunk_list == NULL)
|
|
return;
|
|
|
|
if (num_chunksIn > 0)
|
|
num_chunks = (unsigned int)num_chunksIn;
|
|
|
|
old_num_chunks = png_ptr->num_chunk_list;
|
|
new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
|
|
5 * (num_chunks + old_num_chunks)));
|
|
|
|
if (png_ptr->chunk_list != NULL)
|
|
{
|
|
png_memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
|
|
png_free(png_ptr, png_ptr->chunk_list);
|
|
png_ptr->chunk_list=NULL;
|
|
}
|
|
|
|
png_memcpy(new_list + 5*old_num_chunks, chunk_list,
|
|
5*(unsigned int)num_chunks);
|
|
|
|
for (p = new_list + 5*old_num_chunks + 4, i = 0; i<num_chunks; i++, p += 5)
|
|
*p=(png_byte)keep;
|
|
|
|
png_ptr->num_chunk_list = old_num_chunks + num_chunks;
|
|
png_ptr->chunk_list = new_list;
|
|
png_ptr->free_me |= PNG_FREE_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
|
|
/* Do not report invalid palette index; added at libng-1.5.10 */
|
|
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 */
|