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1803 lines
50 KiB
C
1803 lines
50 KiB
C
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/* pngset.c - storage of image information into info struct
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*
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* Copyright (c) 2018 Cosmin Truta
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* Copyright (c) 1998-2018 Glenn Randers-Pehrson
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* Copyright (c) 1996-1997 Andreas Dilger
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* 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*/) != 0)
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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.red_X = int_red_X;
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XYZ.red_Y = int_red_Y;
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XYZ.red_Z = int_red_Z;
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XYZ.green_X = int_green_X;
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XYZ.green_Y = int_green_Y;
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XYZ.green_Z = int_green_Z;
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XYZ.blue_X = int_blue_X;
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XYZ.blue_Y = int_blue_Y;
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XYZ.blue_Z = int_blue_Z;
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if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace,
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&XYZ, 2) != 0)
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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 Green X"),
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png_fixed(png_ptr, green_Y, "cHRM Green Y"),
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png_fixed(png_ptr, green_Z, "cHRM Green Z"),
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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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png_fixed(png_ptr, blue_Z, "cHRM Blue Z"));
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}
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# endif /* FLOATING_POINT */
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#endif /* cHRM */
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#ifdef PNG_eXIf_SUPPORTED
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void PNGAPI
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png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
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png_bytep eXIf_buf)
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{
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png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1");
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PNG_UNUSED(info_ptr)
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PNG_UNUSED(eXIf_buf)
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}
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void PNGAPI
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png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
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png_uint_32 num_exif, png_bytep eXIf_buf)
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{
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int i;
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png_debug1(1, "in %s storage function", "eXIf");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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if (info_ptr->exif)
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{
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png_free(png_ptr, info_ptr->exif);
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info_ptr->exif = NULL;
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}
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info_ptr->num_exif = num_exif;
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info_ptr->exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr,
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info_ptr->num_exif));
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if (info_ptr->exif == NULL)
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{
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png_warning(png_ptr, "Insufficient memory for eXIf chunk data");
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return;
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}
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info_ptr->free_me |= PNG_FREE_EXIF;
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for (i = 0; i < (int) info_ptr->num_exif; i++)
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info_ptr->exif[i] = eXIf_buf[i];
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info_ptr->valid |= PNG_INFO_eXIf;
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}
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#endif /* eXIf */
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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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png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
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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_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 * (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) != 0)
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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) != 0)
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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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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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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 = 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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{
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png_chunk_report(png_ptr, "Invalid pCAL equation type",
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PNG_CHUNK_WRITE_ERROR);
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return;
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}
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if (nparams < 0 || nparams > 255)
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{
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png_chunk_report(png_ptr, "Invalid pCAL parameter count",
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PNG_CHUNK_WRITE_ERROR);
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return;
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}
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/* Validate params[nparams] */
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for (i=0; i<nparams; ++i)
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{
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if (params[i] == NULL ||
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!png_check_fp_string(params[i], strlen(params[i])))
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{
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png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
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PNG_CHUNK_WRITE_ERROR);
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return;
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}
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}
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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_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
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PNG_CHUNK_WRITE_ERROR);
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return;
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}
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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 = 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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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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(size_t)(((unsigned int)nparams + 1) * (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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memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
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(sizeof (png_charp)));
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for (i = 0; i < nparams; i++)
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{
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length = 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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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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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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/* 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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if (swidth == NULL || (lengthw = 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 = 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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if (info_ptr->scal_s_width == NULL)
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{
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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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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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if (info_ptr->scal_s_height == NULL)
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{
|
|
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_uint_32 max_palette_length;
|
|
|
|
png_debug1(1, "in %s storage function", "PLTE");
|
|
|
|
if (png_ptr == NULL || info_ptr == NULL)
|
|
return;
|
|
|
|
max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
|
|
(1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
|
|
|
|
if (num_palette < 0 || num_palette > (int) 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_error(png_ptr, "Invalid palette");
|
|
}
|
|
|
|
/* 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 or incorrect
|
|
* call to png_set_PLTE() with 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, (unsigned int)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) != 0)
|
|
{
|
|
/* 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;
|
|
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 == 0)
|
|
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 != 0)
|
|
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 ? 0xabadca11U :
|
|
(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 /* iTXt */
|
|
{
|
|
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 != 0)
|
|
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) != 0)
|
|
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);
|
|
|
|
if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
|
|
{
|
|
/* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
|
|
info_ptr->trans_alpha = png_voidcast(png_bytep,
|
|
png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
|
|
memcpy(info_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
|
|
}
|
|
png_ptr->trans_alpha = info_ptr->trans_alpha;
|
|
}
|
|
|
|
if (trans_color != NULL)
|
|
{
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
if (info_ptr->bit_depth < 16)
|
|
{
|
|
int sample_max = (1 << info_ptr->bit_depth) - 1;
|
|
|
|
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");
|
|
}
|
|
#endif
|
|
|
|
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
|
|
{
|
|
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 event 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);
|
|
np->name = NULL;
|
|
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,
|
|
(unsigned int)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;
|
|
++entries;
|
|
}
|
|
while (--nentries);
|
|
|
|
if (nentries > 0)
|
|
png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
|
|
}
|
|
#endif /* sPLT */
|
|
|
|
#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) == 0)
|
|
{
|
|
/* 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) != 0)
|
|
{
|
|
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) == 0)
|
|
{
|
|
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 (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
|
|
location = PNG_AFTER_IDAT;
|
|
|
|
else
|
|
location = PNG_HAVE_IHDR; /* also undocumented */
|
|
}
|
|
|
|
info_ptr->unknown_chunks[chunk].location =
|
|
check_location(png_ptr, location);
|
|
}
|
|
}
|
|
#endif /* STORE_UNKNOWN_CHUNKS */
|
|
|
|
#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 const png_byte chunks_to_ignore[] = {
|
|
98, 75, 71, 68, '\0', /* bKGD */
|
|
99, 72, 82, 77, '\0', /* cHRM */
|
|
101, 88, 73, 102, '\0', /* eXIf */
|
|
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)/*SAFE*/(sizeof chunks_to_ignore)/5U;
|
|
}
|
|
|
|
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 = (unsigned int)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 != 0)
|
|
{
|
|
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 != NULL &&
|
|
(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 != NULL)
|
|
info_ptr->valid |= PNG_INFO_IDAT;
|
|
}
|
|
#endif
|
|
|
|
void PNGAPI
|
|
png_set_compression_buffer_size(png_structrp png_ptr, 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) != 0)
|
|
{
|
|
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) == 0)
|
|
{
|
|
if (png_ptr->zowner != 0)
|
|
{
|
|
png_warning(png_ptr,
|
|
"Compression buffer size cannot be changed because it is in use");
|
|
|
|
return;
|
|
}
|
|
|
|
#ifndef __COVERITY__
|
|
/* Some compilers complain that this is always false. However, it
|
|
* can be true when integer overflow happens.
|
|
*/
|
|
if (size > ZLIB_IO_MAX)
|
|
{
|
|
png_warning(png_ptr,
|
|
"Compression buffer size limited to system maximum");
|
|
size = ZLIB_IO_MAX; /* must fit */
|
|
}
|
|
#endif
|
|
|
|
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 != NULL && info_ptr != NULL)
|
|
info_ptr->valid &= (unsigned int)(~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 0x7fffffff.
|
|
*/
|
|
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 != NULL)
|
|
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 != NULL)
|
|
png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
|
|
}
|
|
#endif /* ?SET_USER_LIMITS */
|
|
|
|
|
|
#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 != 0)
|
|
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 /* BENIGN_ERRORS */
|
|
|
|
#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 zeros
|
|
* (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
|
|
|
|
#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
|
|
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
|
|
/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
|
|
* and if invalid, correct the keyword rather than discarding the entire
|
|
* chunk. The PNG 1.0 specification requires keywords 1-79 characters in
|
|
* length, forbids leading or trailing whitespace, multiple internal spaces,
|
|
* and the non-break space (0x80) from ISO 8859-1. Returns keyword length.
|
|
*
|
|
* The 'new_key' buffer must be 80 characters in size (for the keyword plus a
|
|
* trailing '\0'). If this routine returns 0 then there was no keyword, or a
|
|
* valid one could not be generated, and the caller must png_error.
|
|
*/
|
|
png_uint_32 /* PRIVATE */
|
|
png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
|
|
{
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
png_const_charp orig_key = key;
|
|
#endif
|
|
png_uint_32 key_len = 0;
|
|
int bad_character = 0;
|
|
int space = 1;
|
|
|
|
png_debug(1, "in png_check_keyword");
|
|
|
|
if (key == NULL)
|
|
{
|
|
*new_key = 0;
|
|
return 0;
|
|
}
|
|
|
|
while (*key && key_len < 79)
|
|
{
|
|
png_byte ch = (png_byte)*key++;
|
|
|
|
if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
|
|
{
|
|
*new_key++ = ch; ++key_len; space = 0;
|
|
}
|
|
|
|
else if (space == 0)
|
|
{
|
|
/* A space or an invalid character when one wasn't seen immediately
|
|
* before; output just a space.
|
|
*/
|
|
*new_key++ = 32; ++key_len; space = 1;
|
|
|
|
/* If the character was not a space then it is invalid. */
|
|
if (ch != 32)
|
|
bad_character = ch;
|
|
}
|
|
|
|
else if (bad_character == 0)
|
|
bad_character = ch; /* just skip it, record the first error */
|
|
}
|
|
|
|
if (key_len > 0 && space != 0) /* trailing space */
|
|
{
|
|
--key_len; --new_key;
|
|
if (bad_character == 0)
|
|
bad_character = 32;
|
|
}
|
|
|
|
/* Terminate the keyword */
|
|
*new_key = 0;
|
|
|
|
if (key_len == 0)
|
|
return 0;
|
|
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
/* Try to only output one warning per keyword: */
|
|
if (*key != 0) /* keyword too long */
|
|
png_warning(png_ptr, "keyword truncated");
|
|
|
|
else if (bad_character != 0)
|
|
{
|
|
PNG_WARNING_PARAMETERS(p)
|
|
|
|
png_warning_parameter(p, 1, orig_key);
|
|
png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
|
|
|
|
png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
|
|
}
|
|
#else /* !WARNINGS */
|
|
PNG_UNUSED(png_ptr)
|
|
#endif /* !WARNINGS */
|
|
|
|
return key_len;
|
|
}
|
|
#endif /* TEXT || pCAL || iCCP || sPLT */
|
|
#endif /* READ || WRITE */
|