diff options
Diffstat (limited to 'third_party/libpng/pngset.c')
| -rw-r--r-- | third_party/libpng/pngset.c | 1647 |
1 files changed, 0 insertions, 1647 deletions
diff --git a/third_party/libpng/pngset.c b/third_party/libpng/pngset.c deleted file mode 100644 index 8fd7965fca..0000000000 --- a/third_party/libpng/pngset.c +++ /dev/null @@ -1,1647 +0,0 @@ - -/* pngset.c - storage of image information into info struct - * - * Last changed in libpng 1.6.19 [November 12, 2015] - * Copyright (c) 1998-2015 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); - - /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ - png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep, - png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); - - if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) - memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); - } - - if (trans_color != NULL) - { -#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 -#endif /* READ || WRITE */ |