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Diffstat (limited to 'libpng/pngerror.c')
| -rw-r--r-- | libpng/pngerror.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/libpng/pngerror.c b/libpng/pngerror.c new file mode 100644 index 0000000..b6ad8d8 --- /dev/null +++ b/libpng/pngerror.c @@ -0,0 +1,289 @@ + +/* pngerror.c - stub functions for i/o and memory allocation + * + * libpng 1.2.1 - December 12, 2001 + * For conditions of distribution and use, see copyright notice in png.h + * Copyright (c) 1998-2001 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 file provides a location for all error handling. Users who + * need special error handling are expected to write replacement functions + * and use png_set_error_fn() to use those functions. See the instructions + * at each function. + */ + +#define PNG_INTERNAL +#include "png.h" + +static void /* PRIVATE */ +png_default_error PNGARG((png_structp png_ptr, + png_const_charp message)); +static void /* PRIVATE */ +png_default_warning PNGARG((png_structp png_ptr, + png_const_charp message)); + +/* This function is called whenever there is a fatal error. This function + * should not be changed. If there is a need to handle errors differently, + * you should supply a replacement error function and use png_set_error_fn() + * to replace the error function at run-time. + */ +void PNGAPI +png_error(png_structp png_ptr, png_const_charp message) +{ +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + char msg[16]; + if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) + { + int offset = 0; + if (*message == '#') + { + for (offset=1; offset<15; offset++) + if (*(message+offset) == ' ') + break; + if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) + { + int i; + for (i=0; i<offset-1; i++) + msg[i]=message[i+1]; + msg[i]='\0'; + message=msg; + } + else + message+=offset; + } + else + { + if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) + { + msg[0]='0'; + msg[1]='\0'; + message=msg; + } + } + } +#endif + if (png_ptr->error_fn != NULL) + (*(png_ptr->error_fn))(png_ptr, message); + + /* if the following returns or doesn't exist, use the default function, + which will not return */ + png_default_error(png_ptr, message); +} + +/* This function is called whenever there is a non-fatal error. This function + * should not be changed. If there is a need to handle warnings differently, + * you should supply a replacement warning function and use + * png_set_error_fn() to replace the warning function at run-time. + */ +void PNGAPI +png_warning(png_structp png_ptr, png_const_charp message) +{ + int offset = 0; +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) +#endif + { + if (*message == '#') + { + for (offset=1; offset<15; offset++) + if (*(message+offset) == ' ') + break; + } + } + if (png_ptr->warning_fn != NULL) + (*(png_ptr->warning_fn))(png_ptr, (png_const_charp)(message+offset)); + else + png_default_warning(png_ptr, (png_const_charp)(message+offset)); +} + +/* These utilities are used internally to build an error message that relates + * to the current chunk. The chunk name comes from png_ptr->chunk_name, + * this is used to prefix the message. The message is limited in length + * to 63 bytes, the name characters are output as hex digits wrapped in [] + * if the character is invalid. + */ +#define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97)) +static PNG_CONST char png_digit[16] = { + '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', + 'F' }; + +static void /* PRIVATE */ +png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp + message) +{ + int iout = 0, iin = 0; + + while (iin < 4) + { + int c = png_ptr->chunk_name[iin++]; + if (isnonalpha(c)) + { + buffer[iout++] = '['; + buffer[iout++] = png_digit[(c & 0xf0) >> 4]; + buffer[iout++] = png_digit[c & 0x0f]; + buffer[iout++] = ']'; + } + else + { + buffer[iout++] = (png_byte)c; + } + } + + if (message == NULL) + buffer[iout] = 0; + else + { + buffer[iout++] = ':'; + buffer[iout++] = ' '; + png_memcpy(buffer+iout, message, 64); + buffer[iout+63] = 0; + } +} + +void PNGAPI +png_chunk_error(png_structp png_ptr, png_const_charp message) +{ + char msg[18+64]; + png_format_buffer(png_ptr, msg, message); + png_error(png_ptr, msg); +} + +void PNGAPI +png_chunk_warning(png_structp png_ptr, png_const_charp message) +{ + char msg[18+64]; + png_format_buffer(png_ptr, msg, message); + png_warning(png_ptr, msg); +} + +/* This is the default error handling function. Note that replacements for + * this function MUST NOT RETURN, or the program will likely crash. This + * function is used by default, or if the program supplies NULL for the + * error function pointer in png_set_error_fn(). + */ +static void /* PRIVATE */ +png_default_error(png_structp png_ptr, png_const_charp message) +{ +#ifndef PNG_NO_CONSOLE_IO +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + if (*message == '#') + { + int offset; + char error_number[16]; + for (offset=0; offset<15; offset++) + { + error_number[offset] = *(message+offset+1); + if (*(message+offset) == ' ') + break; + } + if((offset > 1) && (offset < 15)) + { + error_number[offset-1]='\0'; + fprintf(stderr, "libpng error no. %s: %s\n", error_number, message+offset); + } + else + fprintf(stderr, "libpng error: %s, offset=%d\n", message,offset); + } + else +#endif + fprintf(stderr, "libpng error: %s\n", message); +#else + if (message) + /* make compiler happy */ ; +#endif + +#ifdef PNG_SETJMP_SUPPORTED +# ifdef USE_FAR_KEYWORD + { + jmp_buf jmpbuf; + png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf)); + longjmp(jmpbuf, 1); + } +# else + longjmp(png_ptr->jmpbuf, 1); +# endif +#else + if (png_ptr) + /* make compiler happy */ ; + PNG_ABORT(); +#endif +} + +/* This function is called when there is a warning, but the library thinks + * it can continue anyway. Replacement functions don't have to do anything + * here if you don't want them to. In the default configuration, png_ptr is + * not used, but it is passed in case it may be useful. + */ +static void /* PRIVATE */ +png_default_warning(png_structp png_ptr, png_const_charp message) +{ +#ifndef PNG_NO_CONSOLE_IO +# ifdef PNG_ERROR_NUMBERS_SUPPORTED + if (*message == '#') + { + int offset; + char warning_number[16]; + for (offset=0; offset<15; offset++) + { + warning_number[offset]=*(message+offset+1); + if (*(message+offset) == ' ') + break; + } + if((offset > 1) && (offset < 15)) + { + warning_number[offset-1]='\0'; + fprintf(stderr, "libpng warning no. %s: %s\n", warning_number, + message+offset); + } + else + fprintf(stderr, "libpng warning: %s\n", message); + } + else +# endif + fprintf(stderr, "libpng warning: %s\n", message); +#else + if (message) + /* appease compiler */ ; +#endif + if (png_ptr) + return; +} + +/* This function is called when the application wants to use another method + * of handling errors and warnings. Note that the error function MUST NOT + * return to the calling routine or serious problems will occur. The return + * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1) + */ +void PNGAPI +png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warning_fn) +{ + png_ptr->error_ptr = error_ptr; + png_ptr->error_fn = error_fn; + png_ptr->warning_fn = warning_fn; +} + + +/* This function returns a pointer to the error_ptr associated with the user + * functions. The application should free any memory associated with this + * pointer before png_write_destroy and png_read_destroy are called. + */ +png_voidp PNGAPI +png_get_error_ptr(png_structp png_ptr) +{ + return ((png_voidp)png_ptr->error_ptr); +} + + +#ifdef PNG_ERROR_NUMBERS_SUPPORTED +void +png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode) +{ + if(png_ptr != NULL) + { + png_ptr->flags &= + ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); + } +} +#endif |