| |
| /* pngset.c - storage of image information into info struct |
| * |
| * Last changed in libpng 1.6.24 [(PENDING RELEASE)] |
| * Copyright (c) 1998-2016 Glenn Randers-Pehrson |
| * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| * |
| * This code is released under the libpng license. |
| * For conditions of distribution and use, see the disclaimer |
| * and license in png.h |
| * |
| * The functions here are used during reads to store data from the file |
| * into the info struct, and during writes to store application data |
| * into the info struct for writing into the file. This abstracts the |
| * info struct and allows us to change the structure in the future. |
| */ |
| |
| #include "pngpriv.h" |
| |
| #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| |
| #ifdef PNG_bKGD_SUPPORTED |
| void PNGAPI |
| png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_const_color_16p background) |
| { |
| png_debug1(1, "in %s storage function", "bKGD"); |
| |
| if (png_ptr == NULL || info_ptr == NULL || background == NULL) |
| return; |
| |
| info_ptr->background = *background; |
| info_ptr->valid |= PNG_INFO_bKGD; |
| } |
| #endif |
| |
| #ifdef PNG_cHRM_SUPPORTED |
| void PNGFAPI |
| png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, |
| png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, |
| png_fixed_point blue_x, png_fixed_point blue_y) |
| { |
| png_xy xy; |
| |
| png_debug1(1, "in %s storage function", "cHRM fixed"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| xy.redx = red_x; |
| xy.redy = red_y; |
| xy.greenx = green_x; |
| xy.greeny = green_y; |
| xy.bluex = blue_x; |
| xy.bluey = blue_y; |
| xy.whitex = white_x; |
| xy.whitey = white_y; |
| |
| if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy, |
| 2/* override with app values*/) != 0) |
| info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; |
| |
| png_colorspace_sync_info(png_ptr, info_ptr); |
| } |
| |
| void PNGFAPI |
| png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_fixed_point int_red_X, png_fixed_point int_red_Y, |
| png_fixed_point int_red_Z, png_fixed_point int_green_X, |
| png_fixed_point int_green_Y, png_fixed_point int_green_Z, |
| png_fixed_point int_blue_X, png_fixed_point int_blue_Y, |
| png_fixed_point int_blue_Z) |
| { |
| png_XYZ XYZ; |
| |
| png_debug1(1, "in %s storage function", "cHRM XYZ fixed"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| XYZ.red_X = int_red_X; |
| XYZ.red_Y = int_red_Y; |
| XYZ.red_Z = int_red_Z; |
| XYZ.green_X = int_green_X; |
| XYZ.green_Y = int_green_Y; |
| XYZ.green_Z = int_green_Z; |
| XYZ.blue_X = int_blue_X; |
| XYZ.blue_Y = int_blue_Y; |
| XYZ.blue_Z = int_blue_Z; |
| |
| if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, |
| &XYZ, 2) != 0) |
| info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; |
| |
| png_colorspace_sync_info(png_ptr, info_ptr); |
| } |
| |
| # ifdef PNG_FLOATING_POINT_SUPPORTED |
| void PNGAPI |
| png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, |
| double white_x, double white_y, double red_x, double red_y, |
| double green_x, double green_y, double blue_x, double blue_y) |
| { |
| png_set_cHRM_fixed(png_ptr, info_ptr, |
| png_fixed(png_ptr, white_x, "cHRM White X"), |
| png_fixed(png_ptr, white_y, "cHRM White Y"), |
| png_fixed(png_ptr, red_x, "cHRM Red X"), |
| png_fixed(png_ptr, red_y, "cHRM Red Y"), |
| png_fixed(png_ptr, green_x, "cHRM Green X"), |
| png_fixed(png_ptr, green_y, "cHRM Green Y"), |
| png_fixed(png_ptr, blue_x, "cHRM Blue X"), |
| png_fixed(png_ptr, blue_y, "cHRM Blue Y")); |
| } |
| |
| void PNGAPI |
| png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, |
| double red_Y, double red_Z, double green_X, double green_Y, double green_Z, |
| double blue_X, double blue_Y, double blue_Z) |
| { |
| png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, |
| png_fixed(png_ptr, red_X, "cHRM Red X"), |
| png_fixed(png_ptr, red_Y, "cHRM Red Y"), |
| png_fixed(png_ptr, red_Z, "cHRM Red Z"), |
| png_fixed(png_ptr, green_X, "cHRM Green X"), |
| png_fixed(png_ptr, green_Y, "cHRM Green Y"), |
| png_fixed(png_ptr, green_Z, "cHRM Green Z"), |
| png_fixed(png_ptr, blue_X, "cHRM Blue X"), |
| png_fixed(png_ptr, blue_Y, "cHRM Blue Y"), |
| png_fixed(png_ptr, blue_Z, "cHRM Blue Z")); |
| } |
| # endif /* FLOATING_POINT */ |
| |
| #endif /* cHRM */ |
| |
| #ifdef PNG_gAMA_SUPPORTED |
| void PNGFAPI |
| png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_fixed_point file_gamma) |
| { |
| png_debug1(1, "in %s storage function", "gAMA"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); |
| png_colorspace_sync_info(png_ptr, info_ptr); |
| } |
| |
| # ifdef PNG_FLOATING_POINT_SUPPORTED |
| void PNGAPI |
| png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) |
| { |
| png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, |
| "png_set_gAMA")); |
| } |
| # endif |
| #endif |
| |
| #ifdef PNG_hIST_SUPPORTED |
| void PNGAPI |
| png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_const_uint_16p hist) |
| { |
| int i; |
| |
| png_debug1(1, "in %s storage function", "hIST"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| if (info_ptr->num_palette == 0 || info_ptr->num_palette |
| > PNG_MAX_PALETTE_LENGTH) |
| { |
| png_warning(png_ptr, |
| "Invalid palette size, hIST allocation skipped"); |
| |
| return; |
| } |
| |
| png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); |
| |
| /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in |
| * version 1.2.1 |
| */ |
| info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, |
| PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); |
| |
| if (info_ptr->hist == NULL) |
| { |
| png_warning(png_ptr, "Insufficient memory for hIST chunk data"); |
| |
| return; |
| } |
| |
| info_ptr->free_me |= PNG_FREE_HIST; |
| |
| for (i = 0; i < info_ptr->num_palette; i++) |
| info_ptr->hist[i] = hist[i]; |
| |
| info_ptr->valid |= PNG_INFO_hIST; |
| } |
| #endif |
| |
| void PNGAPI |
| png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_uint_32 width, png_uint_32 height, int bit_depth, |
| int color_type, int interlace_type, int compression_type, |
| int filter_type) |
| { |
| png_debug1(1, "in %s storage function", "IHDR"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| info_ptr->width = width; |
| info_ptr->height = height; |
| info_ptr->bit_depth = (png_byte)bit_depth; |
| info_ptr->color_type = (png_byte)color_type; |
| info_ptr->compression_type = (png_byte)compression_type; |
| info_ptr->filter_type = (png_byte)filter_type; |
| info_ptr->interlace_type = (png_byte)interlace_type; |
| |
| png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, |
| info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, |
| info_ptr->compression_type, info_ptr->filter_type); |
| |
| if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| info_ptr->channels = 1; |
| |
| else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0) |
| info_ptr->channels = 3; |
| |
| else |
| info_ptr->channels = 1; |
| |
| if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0) |
| info_ptr->channels++; |
| |
| info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); |
| |
| info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); |
| } |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| void PNGAPI |
| png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_int_32 offset_x, png_int_32 offset_y, int unit_type) |
| { |
| png_debug1(1, "in %s storage function", "oFFs"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| info_ptr->x_offset = offset_x; |
| info_ptr->y_offset = offset_y; |
| info_ptr->offset_unit_type = (png_byte)unit_type; |
| info_ptr->valid |= PNG_INFO_oFFs; |
| } |
| #endif |
| |
| #ifdef PNG_pCAL_SUPPORTED |
| void PNGAPI |
| png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, |
| int nparams, png_const_charp units, png_charpp params) |
| { |
| png_size_t length; |
| int i; |
| |
| png_debug1(1, "in %s storage function", "pCAL"); |
| |
| if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL |
| || (nparams > 0 && params == NULL)) |
| return; |
| |
| length = strlen(purpose) + 1; |
| png_debug1(3, "allocating purpose for info (%lu bytes)", |
| (unsigned long)length); |
| |
| /* TODO: validate format of calibration name and unit name */ |
| |
| /* Check that the type matches the specification. */ |
| if (type < 0 || type > 3) |
| png_error(png_ptr, "Invalid pCAL equation type"); |
| |
| if (nparams < 0 || nparams > 255) |
| png_error(png_ptr, "Invalid pCAL parameter count"); |
| |
| /* Validate params[nparams] */ |
| for (i=0; i<nparams; ++i) |
| { |
| if (params[i] == NULL || |
| !png_check_fp_string(params[i], strlen(params[i]))) |
| png_error(png_ptr, "Invalid format for pCAL parameter"); |
| } |
| |
| info_ptr->pcal_purpose = png_voidcast(png_charp, |
| png_malloc_warn(png_ptr, length)); |
| |
| if (info_ptr->pcal_purpose == NULL) |
| { |
| png_warning(png_ptr, "Insufficient memory for pCAL purpose"); |
| |
| return; |
| } |
| |
| memcpy(info_ptr->pcal_purpose, purpose, length); |
| |
| png_debug(3, "storing X0, X1, type, and nparams in info"); |
| info_ptr->pcal_X0 = X0; |
| info_ptr->pcal_X1 = X1; |
| info_ptr->pcal_type = (png_byte)type; |
| info_ptr->pcal_nparams = (png_byte)nparams; |
| |
| length = strlen(units) + 1; |
| png_debug1(3, "allocating units for info (%lu bytes)", |
| (unsigned long)length); |
| |
| info_ptr->pcal_units = png_voidcast(png_charp, |
| png_malloc_warn(png_ptr, length)); |
| |
| if (info_ptr->pcal_units == NULL) |
| { |
| png_warning(png_ptr, "Insufficient memory for pCAL units"); |
| |
| return; |
| } |
| |
| memcpy(info_ptr->pcal_units, units, length); |
| |
| info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, |
| (png_size_t)((nparams + 1) * (sizeof (png_charp))))); |
| |
| if (info_ptr->pcal_params == NULL) |
| { |
| png_warning(png_ptr, "Insufficient memory for pCAL params"); |
| |
| return; |
| } |
| |
| memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); |
| |
| for (i = 0; i < nparams; i++) |
| { |
| length = strlen(params[i]) + 1; |
| png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, |
| (unsigned long)length); |
| |
| info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); |
| |
| if (info_ptr->pcal_params[i] == NULL) |
| { |
| png_warning(png_ptr, "Insufficient memory for pCAL parameter"); |
| |
| return; |
| } |
| |
| memcpy(info_ptr->pcal_params[i], params[i], length); |
| } |
| |
| info_ptr->valid |= PNG_INFO_pCAL; |
| info_ptr->free_me |= PNG_FREE_PCAL; |
| } |
| #endif |
| |
| #ifdef PNG_sCAL_SUPPORTED |
| void PNGAPI |
| png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, |
| int unit, png_const_charp swidth, png_const_charp sheight) |
| { |
| png_size_t lengthw = 0, lengthh = 0; |
| |
| png_debug1(1, "in %s storage function", "sCAL"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| /* Double check the unit (should never get here with an invalid |
| * unit unless this is an API call.) |
| */ |
| if (unit != 1 && unit != 2) |
| png_error(png_ptr, "Invalid sCAL unit"); |
| |
| if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || |
| swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) |
| png_error(png_ptr, "Invalid sCAL width"); |
| |
| if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || |
| sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) |
| png_error(png_ptr, "Invalid sCAL height"); |
| |
| info_ptr->scal_unit = (png_byte)unit; |
| |
| ++lengthw; |
| |
| png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); |
| |
| info_ptr->scal_s_width = png_voidcast(png_charp, |
| png_malloc_warn(png_ptr, lengthw)); |
| |
| if (info_ptr->scal_s_width == NULL) |
| { |
| png_warning(png_ptr, "Memory allocation failed while processing sCAL"); |
| |
| return; |
| } |
| |
| memcpy(info_ptr->scal_s_width, swidth, lengthw); |
| |
| ++lengthh; |
| |
| png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); |
| |
| info_ptr->scal_s_height = png_voidcast(png_charp, |
| png_malloc_warn(png_ptr, lengthh)); |
| |
| if (info_ptr->scal_s_height == NULL) |
| { |
| png_free (png_ptr, info_ptr->scal_s_width); |
| info_ptr->scal_s_width = NULL; |
| |
| png_warning(png_ptr, "Memory allocation failed while processing sCAL"); |
| |
| return; |
| } |
| |
| memcpy(info_ptr->scal_s_height, sheight, lengthh); |
| |
| info_ptr->valid |= PNG_INFO_sCAL; |
| info_ptr->free_me |= PNG_FREE_SCAL; |
| } |
| |
| # ifdef PNG_FLOATING_POINT_SUPPORTED |
| void PNGAPI |
| png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, |
| double width, double height) |
| { |
| png_debug1(1, "in %s storage function", "sCAL"); |
| |
| /* Check the arguments. */ |
| if (width <= 0) |
| png_warning(png_ptr, "Invalid sCAL width ignored"); |
| |
| else if (height <= 0) |
| png_warning(png_ptr, "Invalid sCAL height ignored"); |
| |
| else |
| { |
| /* Convert 'width' and 'height' to ASCII. */ |
| char swidth[PNG_sCAL_MAX_DIGITS+1]; |
| char sheight[PNG_sCAL_MAX_DIGITS+1]; |
| |
| png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, |
| PNG_sCAL_PRECISION); |
| png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, |
| PNG_sCAL_PRECISION); |
| |
| png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); |
| } |
| } |
| # endif |
| |
| # ifdef PNG_FIXED_POINT_SUPPORTED |
| void PNGAPI |
| png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, |
| png_fixed_point width, png_fixed_point height) |
| { |
| png_debug1(1, "in %s storage function", "sCAL"); |
| |
| /* Check the arguments. */ |
| if (width <= 0) |
| png_warning(png_ptr, "Invalid sCAL width ignored"); |
| |
| else if (height <= 0) |
| png_warning(png_ptr, "Invalid sCAL height ignored"); |
| |
| else |
| { |
| /* Convert 'width' and 'height' to ASCII. */ |
| char swidth[PNG_sCAL_MAX_DIGITS+1]; |
| char sheight[PNG_sCAL_MAX_DIGITS+1]; |
| |
| png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); |
| png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); |
| |
| png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); |
| } |
| } |
| # endif |
| #endif |
| |
| #ifdef PNG_pHYs_SUPPORTED |
| void PNGAPI |
| png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_uint_32 res_x, png_uint_32 res_y, int unit_type) |
| { |
| png_debug1(1, "in %s storage function", "pHYs"); |
| |
| if (png_ptr == NULL || info_ptr == NULL) |
| return; |
| |
| info_ptr->x_pixels_per_unit = res_x; |
| info_ptr->y_pixels_per_unit = res_y; |
| info_ptr->phys_unit_type = (png_byte)unit_type; |
| info_ptr->valid |= PNG_INFO_pHYs; |
| } |
| #endif |
| |
| void PNGAPI |
| png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, |
| png_const_colorp palette, int num_palette) |
| { |
| |
| png_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, 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; |
| png_size_t length; |
| |
| png_debug1(1, "in %s storage function", "iCCP"); |
| |
| if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) |
| return; |
| |
| if (compression_type != PNG_COMPRESSION_TYPE_BASE) |
| png_app_error(png_ptr, "Invalid iCCP compression method"); |
| |
| /* Set the colorspace first because this validates the profile; do not |
| * override previously set app cHRM or gAMA here (because likely as not the |
| * application knows better than libpng what the correct values are.) Pass |
| * the info_ptr color_type field to png_colorspace_set_ICC because in the |
| * write case it has not yet been stored in png_ptr. |
| */ |
| { |
| int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, |
| proflen, profile, info_ptr->color_type); |
| |
| png_colorspace_sync_info(png_ptr, info_ptr); |
| |
| /* Don't do any of the copying if the profile was bad, or inconsistent. */ |
| if (result == 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, (png_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 |
| { |
| png_size_t length; |
| |
| /* Skip invalid input entries */ |
| if (entries->name == NULL || entries->entries == NULL) |
| { |
| /* png_handle_sPLT doesn't do this, so this is an app error */ |
| png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); |
| /* Just skip the invalid entry */ |
| continue; |
| } |
| |
| np->depth = entries->depth; |
| |
| /* In the 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, |
| entries->nentries * sizeof (png_sPLT_entry)); |
| |
| /* Note that 'continue' skips the advance of the out pointer and out |
| * count, so an invalid entry is not added. |
| */ |
| info_ptr->valid |= PNG_INFO_sPLT; |
| ++(info_ptr->splt_palettes_num); |
| ++np; |
| } |
| while (++entries, --nentries); |
| |
| if (nentries > 0) |
| png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); |
| } |
| #endif /* 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 ((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 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)/*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 = 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, 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) != 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 &= ~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 */ |