/* * This software is licensed under the terms of the MIT License. * See COPYING for further information. * --- * Copyright (c) 2011-2024, Lukas Weber . * Copyright (c) 2012-2024, Andrei Alexeyev . */ #include "pngcruft.h" #include "log.h" static void pngutil_rwops_write_data(png_structp png_ptr, png_bytep data, png_size_t length) { SDL_RWops *out = png_get_io_ptr(png_ptr); SDL_RWwrite(out, data, length, 1); } static void pngutil_rwops_flush_data(png_structp png_ptr) { // no flush operation in SDL_RWops } static void pngutil_rwops_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { SDL_RWops *out = png_get_io_ptr(png_ptr); SDL_RWread(out, data, length, 1); } void pngutil_init_rwops_read(png_structp png, SDL_RWops *rwops) { png_set_read_fn(png, rwops, pngutil_rwops_read_data); } void pngutil_init_rwops_write(png_structp png, SDL_RWops *rwops) { png_set_write_fn(png, rwops, pngutil_rwops_write_data, pngutil_rwops_flush_data); } noreturn static void pngutil_error_handler(png_structp png_ptr, png_const_charp error_msg) { log_error("PNG error: %s", error_msg); png_longjmp(png_ptr, 1); } static void pngutil_warning_handler(png_structp png_ptr, png_const_charp warning_msg) { log_warn("PNG warning: %s", warning_msg); } void pngutil_setup_error_handlers(png_structp png) { png_set_error_fn(png, NULL, pngutil_error_handler, pngutil_warning_handler); } static PNG_CALLBACK(png_voidp, pngutil_malloc, (png_structp png, png_alloc_size_t size)) { return mem_alloc(size); } static PNG_CALLBACK(void, pngutil_free, (png_structp png, png_voidp ptr)) { mem_free(ptr); } png_structp pngutil_create_read_struct(void) { return png_create_read_struct_2( PNG_LIBPNG_VER_STRING, NULL, pngutil_error_handler, pngutil_warning_handler, NULL, pngutil_malloc, pngutil_free); } png_structp pngutil_create_write_struct(void) { return png_create_write_struct_2( PNG_LIBPNG_VER_STRING, NULL, pngutil_error_handler, pngutil_warning_handler, NULL, pngutil_malloc, pngutil_free); }