diff options
Diffstat (limited to 'pngget.c')
| -rw-r--r-- | pngget.c | 129 |
1 files changed, 84 insertions, 45 deletions
@@ -1,9 +1,9 @@ /* pngget.c - retrieval of values from info struct * - * Last changed in libpng 1.2.30 [August 15, 2008] + * Last changed in libpng 1.2.37 [June 4, 2009] * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2008 Glenn Randers-Pehrson + * Copyright (c) 1998-2009 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.) */ @@ -17,6 +17,7 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->valid & flag); + else return(0); } @@ -26,6 +27,7 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->rowbytes); + else return(0); } @@ -36,20 +38,20 @@ png_get_rows(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->row_pointers); + else return(0); } #endif #ifdef PNG_EASY_ACCESS_SUPPORTED -/* easy access to info, added in libpng-0.99 */ +/* Easy access to info, added in libpng-0.99 */ png_uint_32 PNGAPI png_get_image_width(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) - { return info_ptr->width; - } + return (0); } @@ -57,9 +59,8 @@ png_uint_32 PNGAPI png_get_image_height(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) - { return info_ptr->height; - } + return (0); } @@ -67,9 +68,8 @@ png_byte PNGAPI png_get_bit_depth(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) - { return info_ptr->bit_depth; - } + return (0); } @@ -77,9 +77,8 @@ png_byte PNGAPI png_get_color_type(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) - { return info_ptr->color_type; - } + return (0); } @@ -87,9 +86,8 @@ png_byte PNGAPI png_get_filter_type(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) - { return info_ptr->filter_type; - } + return (0); } @@ -97,9 +95,8 @@ png_byte PNGAPI png_get_interlace_type(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) - { return info_ptr->interlace_type; - } + return (0); } @@ -107,9 +104,8 @@ png_byte PNGAPI png_get_compression_type(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) - { return info_ptr->compression_type; - } + return (0); } @@ -121,9 +117,12 @@ png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) if (info_ptr->valid & PNG_INFO_pHYs) { png_debug1(1, "in %s retrieval function", "png_get_x_pixels_per_meter"); + if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER) return (0); - else return (info_ptr->x_pixels_per_unit); + + else + return (info_ptr->x_pixels_per_unit); } #else return (0); @@ -139,9 +138,12 @@ png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) if (info_ptr->valid & PNG_INFO_pHYs) { png_debug1(1, "in %s retrieval function", "png_get_y_pixels_per_meter"); + if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER) return (0); - else return (info_ptr->y_pixels_per_unit); + + else + return (info_ptr->y_pixels_per_unit); } #else return (0); @@ -157,10 +159,13 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) if (info_ptr->valid & PNG_INFO_pHYs) { png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter"); + if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER || info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit) return (0); - else return (info_ptr->x_pixels_per_unit); + + else + return (info_ptr->x_pixels_per_unit); } #else return (0); @@ -174,6 +179,7 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) #if defined(PNG_pHYs_SUPPORTED) + if (info_ptr->valid & PNG_INFO_pHYs) { png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio"); @@ -184,7 +190,7 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr) /(float)info_ptr->x_pixels_per_unit)); } #else - return (0.0); + return (0.0); #endif return ((float)0.0); } @@ -195,15 +201,19 @@ png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) #if defined(PNG_oFFs_SUPPORTED) + if (info_ptr->valid & PNG_INFO_oFFs) { png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); + if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) return (0); - else return (info_ptr->x_offset); + + else + return (info_ptr->x_offset); } #else - return (0); + return (0); #endif return (0); } @@ -212,13 +222,17 @@ png_int_32 PNGAPI png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) + #if defined(PNG_oFFs_SUPPORTED) if (info_ptr->valid & PNG_INFO_oFFs) { png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); + if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) return (0); - else return (info_ptr->y_offset); + + else + return (info_ptr->y_offset); } #else return (0); @@ -230,13 +244,17 @@ png_int_32 PNGAPI png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) + #if defined(PNG_oFFs_SUPPORTED) if (info_ptr->valid & PNG_INFO_oFFs) { png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); + if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) return (0); - else return (info_ptr->x_offset); + + else + return (info_ptr->x_offset); } #else return (0); @@ -248,13 +266,17 @@ png_int_32 PNGAPI png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr) { if (png_ptr != NULL && info_ptr != NULL) + #if defined(PNG_oFFs_SUPPORTED) if (info_ptr->valid & PNG_INFO_oFFs) { png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); + if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) return (0); - else return (info_ptr->y_offset); + + else + return (info_ptr->y_offset); } #else return (0); @@ -495,8 +517,9 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr, png_debug1(1, "in %s retrieval function", "iCCP"); *name = info_ptr->iccp_name; *profile = info_ptr->iccp_profile; - /* compression_type is a dummy so the API won't have to change - if we introduce multiple compression types later. */ + /* Compression_type is a dummy so the API won't have to change + * if we introduce multiple compression types later. + */ *proflen = (int)info_ptr->iccp_proflen; *compression_type = (int)info_ptr->iccp_compression; return (PNG_INFO_iCCP); @@ -549,22 +572,29 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr, *height = info_ptr->height; *bit_depth = info_ptr->bit_depth; if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16) - png_error(png_ptr, "Invalid bit depth"); + png_error(png_ptr, "Invalid bit depth"); + *color_type = info_ptr->color_type; + if (info_ptr->color_type > 6) - png_error(png_ptr, "Invalid color type"); + png_error(png_ptr, "Invalid color type"); + if (compression_type != NULL) *compression_type = info_ptr->compression_type; + if (filter_type != NULL) *filter_type = info_ptr->filter_type; + if (interlace_type != NULL) *interlace_type = info_ptr->interlace_type; - /* check for potential overflow of rowbytes */ + /* Check for potential overflow of rowbytes */ if (*width == 0 || *width > PNG_UINT_31_MAX) png_error(png_ptr, "Invalid image width"); + if (*height == 0 || *height > PNG_UINT_31_MAX) png_error(png_ptr, "Invalid image height"); + if (info_ptr->width > (PNG_UINT_32_MAX >> 3) /* 8-byte RGBA pixels */ - 64 /* bigrowbuf hack */ @@ -575,6 +605,7 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr, png_warning(png_ptr, "Width too large for libpng to process image data."); } + return (1); } return (0); @@ -605,8 +636,8 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr, png_charp *units, png_charpp *params) { if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL) - && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL && - nparams != NULL && units != NULL && params != NULL) + && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL && + nparams != NULL && units != NULL && params != NULL) { png_debug1(1, "in %s retrieval function", "pCAL"); *purpose = info_ptr->pcal_purpose; @@ -629,7 +660,7 @@ png_get_sCAL(png_structp png_ptr, png_infop info_ptr, int *unit, double *width, double *height) { if (png_ptr != NULL && info_ptr != NULL && - (info_ptr->valid & PNG_INFO_sCAL)) + (info_ptr->valid & PNG_INFO_sCAL)) { *unit = info_ptr->scal_unit; *width = info_ptr->scal_pixel_width; @@ -645,7 +676,7 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr, int *unit, png_charpp width, png_charpp height) { if (png_ptr != NULL && info_ptr != NULL && - (info_ptr->valid & PNG_INFO_sCAL)) + (info_ptr->valid & PNG_INFO_sCAL)) { *unit = info_ptr->scal_unit; *width = info_ptr->scal_s_width; @@ -669,16 +700,19 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr, (info_ptr->valid & PNG_INFO_pHYs)) { png_debug1(1, "in %s retrieval function", "pHYs"); + if (res_x != NULL) { *res_x = info_ptr->x_pixels_per_unit; retval |= PNG_INFO_pHYs; } + if (res_y != NULL) { *res_y = info_ptr->y_pixels_per_unit; retval |= PNG_INFO_pHYs; } + if (unit_type != NULL) { *unit_type = (int)info_ptr->phys_unit_type; @@ -730,10 +764,13 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr, png_debug1(1, "in %s retrieval function", (png_ptr->chunk_name[0] == '\0' ? "text" : (png_const_charp)png_ptr->chunk_name)); + if (text_ptr != NULL) *text_ptr = info_ptr->text; + if (num_text != NULL) *num_text = info_ptr->num_text; + return ((png_uint_32)info_ptr->num_text); } if (num_text != NULL) @@ -773,6 +810,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr, *trans = info_ptr->trans; retval |= PNG_INFO_tRNS; } + if (trans_values != NULL) *trans_values = &(info_ptr->trans_values); } @@ -783,6 +821,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr, *trans_values = &(info_ptr->trans_values); retval |= PNG_INFO_tRNS; } + if (trans != NULL) *trans = NULL; } @@ -836,47 +875,47 @@ png_get_compression_buffer_size(png_structp png_ptr) #ifdef PNG_ASSEMBLER_CODE_SUPPORTED #ifndef PNG_1_0_X -/* this function was added to libpng 1.2.0 and should exist by default */ +/* This function was added to libpng 1.2.0 and should exist by default */ png_uint_32 PNGAPI png_get_asm_flags (png_structp png_ptr) { - /* obsolete, to be removed from libpng-1.4.0 */ + /* Obsolete, to be removed from libpng-1.4.0 */ return (png_ptr? 0L: 0L); } -/* this function was added to libpng 1.2.0 and should exist by default */ +/* This function was added to libpng 1.2.0 and should exist by default */ png_uint_32 PNGAPI png_get_asm_flagmask (int flag_select) { - /* obsolete, to be removed from libpng-1.4.0 */ + /* Obsolete, to be removed from libpng-1.4.0 */ flag_select=flag_select; return 0L; } /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */ -/* this function was added to libpng 1.2.0 */ +/* This function was added to libpng 1.2.0 */ png_uint_32 PNGAPI png_get_mmx_flagmask (int flag_select, int *compilerID) { - /* obsolete, to be removed from libpng-1.4.0 */ + /* Obsolete, to be removed from libpng-1.4.0 */ flag_select=flag_select; *compilerID = -1; /* unknown (i.e., no asm/MMX code compiled) */ return 0L; } -/* this function was added to libpng 1.2.0 */ +/* This function was added to libpng 1.2.0 */ png_byte PNGAPI png_get_mmx_bitdepth_threshold (png_structp png_ptr) { - /* obsolete, to be removed from libpng-1.4.0 */ + /* Obsolete, to be removed from libpng-1.4.0 */ return (png_ptr? 0: 0); } -/* this function was added to libpng 1.2.0 */ +/* This function was added to libpng 1.2.0 */ png_uint_32 PNGAPI png_get_mmx_rowbytes_threshold (png_structp png_ptr) { - /* obsolete, to be removed from libpng-1.4.0 */ + /* Obsolete, to be removed from libpng-1.4.0 */ return (png_ptr? 0L: 0L); } #endif /* ?PNG_1_0_X */ |