| 0,0 → 1,897 |
|---|
| |
| ; pngerror.asm - stub functions for i/o and memory allocation |
| |
| ; Last changed in libpng 1.6.24 [August 4, 2016] |
| ; Copyright (c) 1998-2002,2004,2006-2016 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 |
| |
| ; 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. |
| |
| ; 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. |
| |
| ;if PNG_ERROR_TEXT_SUPPORTED |
| ;void png_error(png_const_structrp png_ptr, charp error_message) |
| ;{ |
| if PNG_ERROR_NUMBERS_SUPPORTED eq 1 |
| ; char msg[16]; |
| ; if (png_ptr != NULL) |
| ; { |
| ; if ((png_ptr->flags & |
| ; (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0) |
| ; { |
| ; if (*error_message == PNG_LITERAL_SHARP) |
| ; { |
| ;Strip "#nnnn " from beginning of error message. |
| ; int offset; |
| ; for (offset = 1; offset<15; offset++) |
| ; if (error_message[offset] == ' ') |
| ; break; |
| |
| ; if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0) |
| ; { |
| ; int i; |
| ; for (i = 0; i < offset - 1; i++) |
| ; msg[i] = error_message[i + 1]; |
| ; msg[i - 1] = '\0'; |
| ; error_message = msg; |
| ; } |
| |
| ; else |
| ; error_message += offset; |
| ; } |
| |
| ; else |
| ; { |
| ; if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0) |
| ; { |
| ; msg[0] = '0'; |
| ; msg[1] = '\0'; |
| ; error_message = msg; |
| ; } |
| ; } |
| ; } |
| ; } |
| end if |
| ; if (png_ptr != NULL && png_ptr->error_fn != NULL) |
| ; (*(png_ptr->error_fn))(png_ptr, error_message); |
| |
| ; If the custom handler doesn't exist, or if it returns, |
| ; use the default handler, which will not return. |
| ; png_default_error(png_ptr, error_message); |
| ;} |
| ;#else |
| ;void png_err(png_const_structrp png_ptr) |
| ;{ |
| ; Prior to 1.5.2 the error_fn received a NULL pointer, expressed |
| ; erroneously as '\0', instead of the empty string "". This was |
| ; apparently an error, introduced in libpng-1.2.20, and png_default_error |
| ; will crash in this case. |
| |
| ; if (png_ptr != NULL && png_ptr->error_fn != NULL) |
| ; (*(png_ptr->error_fn))(png_ptr, ""); |
| |
| ; If the custom handler doesn't exist, or if it returns, |
| ; use the default handler, which will not return. |
| ; png_default_error(png_ptr, ""); |
| ;} |
| ;end if /* ERROR_TEXT */ |
| |
| ; Utility to safely appends strings to a buffer. This never errors out so |
| ; error checking is not required in the caller. |
| |
| ;size_t (charp buffer, size_t bufsize, size_t pos, charp string) |
| align 4 |
| proc png_safecat uses ebx ecx edi esi, buffer:dword, bufsize:dword, pos:dword, string:dword |
| mov edi,[buffer] |
| cmp edi,0 |
| je .end0 |
| mov ebx,[pos] |
| mov ecx,[bufsize] |
| cmp ebx,ecx |
| jge .end0 ;if (..!=0 && ..<..) |
| mov esi,[string] |
| cmp esi,0 |
| je .end1 ;if (..!=0) |
| dec ecx |
| @@: |
| cmp byte[esi],0 |
| je .end1 |
| cmp ebx,ecx |
| jge .end1 |
| movsb |
| inc ebx |
| jmp @b |
| align 4 |
| .end1: |
| xor al,al |
| stosb |
| .end0: |
| mov eax,ebx |
| ret |
| endp |
| |
| ;#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) |
| ; Utility to dump an unsigned value into a buffer, given a start pointer and |
| ; and end pointer (which should point just *beyond* the end of the buffer!) |
| ; Returns the pointer to the start of the formatted string. |
| |
| ;charp png_format_number(charp start, charp end, int format, |
| ; png_alloc_size_t number) |
| ;{ |
| ; int count = 0; /* number of digits output */ |
| ; int mincount = 1; /* minimum number required */ |
| ; int output = 0; /* digit output (for the fixed point format) */ |
| |
| ; *--end = '\0'; |
| |
| ; /* This is written so that the loop always runs at least once, even with |
| ; * number zero. |
| |
| ; while (end > start && (number != 0 || count < mincount)) |
| ; { |
| |
| ; char digits[] = "0123456789ABCDEF"; |
| |
| ; switch (format) |
| ; { |
| ; case PNG_NUMBER_FORMAT_fixed: |
| ; /* Needs five digits (the fraction) */ |
| ; mincount = 5; |
| ; if (output != 0 || number % 10 != 0) |
| ; { |
| ; *--end = digits[number % 10]; |
| ; output = 1; |
| ; } |
| ; number /= 10; |
| ; break; |
| |
| ; case PNG_NUMBER_FORMAT_02u: |
| ; /* Expects at least 2 digits. */ |
| ; mincount = 2; |
| ; /* FALL THROUGH */ |
| |
| ; case PNG_NUMBER_FORMAT_u: |
| ; *--end = digits[number % 10]; |
| ; number /= 10; |
| ; break; |
| |
| ; case PNG_NUMBER_FORMAT_02x: |
| ; /* This format expects at least two digits */ |
| ; mincount = 2; |
| ; /* FALL THROUGH */ |
| |
| ; case PNG_NUMBER_FORMAT_x: |
| ; *--end = digits[number & 0xf]; |
| ; number >>= 4; |
| ; break; |
| |
| ; default: /* an error */ |
| ; number = 0; |
| ; break; |
| ; } |
| |
| ; Keep track of the number of digits added |
| ; ++count; |
| |
| ; Float a fixed number here: |
| ; if ((format == PNG_NUMBER_FORMAT_fixed) && (count == 5) && (end > start)) |
| ; { |
| ; End of the fraction, but maybe nothing was output? In that case |
| ; drop the decimal point. If the number is a true zero handle that |
| ; here. |
| |
| ; if (output != 0) |
| ; *--end = '.'; |
| ; else if (number == 0) /* and !output */ |
| ; *--end = '0'; |
| ; } |
| ; } |
| |
| ; return end; |
| ;} |
| ;end if |
| |
| ;if PNG_WARNINGS_SUPPORTED |
| ; 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 png_warning(png_const_structrp png_ptr, charp warning_message) |
| ;{ |
| ; int offset = 0; |
| ; if (png_ptr != NULL) |
| ; { |
| if PNG_ERROR_NUMBERS_SUPPORTED eq 1 |
| ; if ((png_ptr->flags & |
| ; (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0) |
| end if |
| ; { |
| ; if (*warning_message == PNG_LITERAL_SHARP) |
| ; { |
| ; for (offset = 1; offset < 15; offset++) |
| ; if (warning_message[offset] == ' ') |
| ; break; |
| ; } |
| ; } |
| ; } |
| ; if (png_ptr != NULL && png_ptr->warning_fn != NULL) |
| ; (*(png_ptr->warning_fn))(png_ptr, warning_message + offset); |
| ; else |
| ; png_default_warning(png_ptr, warning_message + offset); |
| ;} |
| |
| ; These functions support 'formatted' warning messages with up to |
| ; PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter |
| ; is introduced by @<number>, where 'number' starts at 1. This follows the |
| ; standard established by X/Open for internationalizable error messages. |
| |
| ;void |
| ;png_warning_parameter(png_warning_parameters p, int number, |
| ; charp string) |
| ;{ |
| ; if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT) |
| ; (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string); |
| ;} |
| |
| ;void |
| ;png_warning_parameter_unsigned(png_warning_parameters p, int number, int format, |
| ; png_alloc_size_t value) |
| ;{ |
| ; char buffer[PNG_NUMBER_BUFFER_SIZE]; |
| ; png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value)); |
| ;} |
| |
| ;void (png_warning_parameters p, int number, int format, int_32 value) |
| align 4 |
| proc png_warning_parameter_signed, p:dword, number:dword, format:dword, value:dword |
| ; png_alloc_size_t u; |
| ; charp str; |
| ; char buffer[PNG_NUMBER_BUFFER_SIZE]; |
| |
| ; Avoid overflow by doing the negate in a png_alloc_size_t: |
| ; u = (png_alloc_size_t)value; |
| ; if (value < 0) |
| ; u = ~u + 1; |
| |
| ; str = PNG_FORMAT_NUMBER(buffer, format, u); |
| |
| ; if (value < 0 && str > buffer) |
| ; *--str = '-'; |
| |
| ; png_warning_parameter(p, number, str); |
| ret |
| endp |
| |
| ;void (png_const_structrp png_ptr, png_warning_parameters p, charp message) |
| align 4 |
| proc png_formatted_warning, png_ptr:dword, p:dword, message:dword |
| ; The internal buffer is just 192 bytes - enough for all our messages, |
| ; overflow doesn't happen because this code checks! If someone figures |
| ; out how to send us a message longer than 192 bytes, all that will |
| ; happen is that the message will be truncated appropriately. |
| |
| ; size_t i = 0; /* Index in the msg[] buffer: */ |
| ; char msg[192]; |
| |
| ; Each iteration through the following loop writes at most one character |
| ; to msg[i++] then returns here to validate that there is still space for |
| ; the trailing '\0'. It may (in the case of a parameter) read more than |
| ; one character from message[]; it must check for '\0' and continue to the |
| ; test if it finds the end of string. |
| |
| ; while (i<(sizeof msg)-1 && *message != '\0') |
| ; { |
| ; '@' at end of string is now just printed (previously it was skipped); |
| ; it is an error in the calling code to terminate the string with @. |
| |
| ; if (p != NULL && *message == '@' && message[1] != '\0') |
| ; { |
| ; int parameter_char = *++message; /* Consume the '@' */ |
| ; char valid_parameters[] = "123456789"; |
| ; int parameter = 0; |
| |
| ; Search for the parameter digit, the index in the string is the |
| ; parameter to use. |
| |
| ; while (valid_parameters[parameter] != parameter_char && |
| ; valid_parameters[parameter] != '\0') |
| ; ++parameter; |
| |
| ; If the parameter digit is out of range it will just get printed. |
| ; if (parameter < PNG_WARNING_PARAMETER_COUNT) |
| ; { |
| ; Append this parameter |
| ; charp parm = p[parameter]; |
| ; charp pend = p[parameter] + (sizeof p[parameter]); |
| |
| ; No need to copy the trailing '\0' here, but there is no guarantee |
| ; that parm[] has been initialized, so there is no guarantee of a |
| ; trailing '\0': |
| |
| ; while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend) |
| ; msg[i++] = *parm++; |
| |
| ; Consume the parameter digit too: |
| ; ++message; |
| ; continue; |
| ; } |
| |
| ; else not a parameter and there is a character after the @ sign; just |
| ; copy that. This is known not to be '\0' because of the test above. |
| |
| ; } |
| |
| ; At this point *message can't be '\0', even in the bad parameter case |
| ; above where there is a lone '@' at the end of the message string. |
| |
| ; msg[i++] = *message++; |
| ; } |
| |
| ; i is always less than (sizeof msg), so: |
| ; msg[i] = '\0'; |
| |
| ; And this is the formatted message. It may be larger than |
| ; PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these |
| ; are not (currently) formatted. |
| |
| ; png_warning(png_ptr, msg); |
| ret |
| endp |
| ;end if /* WARNINGS */ |
| |
| ;void png_benign_error(png_const_structrp png_ptr, charp error_message) |
| ;{ |
| ; if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0) |
| ; { |
| ;# ifdef PNG_READ_SUPPORTED |
| ; if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && |
| ; png_ptr->chunk_name != 0) |
| ; png_chunk_warning(png_ptr, error_message); |
| ; else |
| ;# endif |
| ; png_warning(png_ptr, error_message); |
| ; } |
| |
| ; else |
| ; { |
| ;# ifdef PNG_READ_SUPPORTED |
| ; if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && |
| ; png_ptr->chunk_name != 0) |
| ; png_chunk_error(png_ptr, error_message); |
| ; else |
| ;# endif |
| ; png_error(png_ptr, error_message); |
| ; } |
| ;} |
| |
| ;void png_app_warning(png_const_structrp png_ptr, charp error_message) |
| ;{ |
| ; if ((png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) != 0) |
| ; png_warning(png_ptr, error_message); |
| ; else |
| ; png_error(png_ptr, error_message); |
| ;} |
| |
| ;void (png_structrp png_ptr, charp error_message) |
| align 4 |
| proc png_app_error uses eax edi, png_ptr:dword, error_message:dword |
| mov edi,[png_ptr] |
| mov eax,[edi+png_struct.flags] |
| and eax,PNG_FLAG_APP_ERRORS_WARN |
| cmp eax,0 |
| je @f ;if (..!=0) |
| png_warning edi, [error_message] |
| jmp .end0 |
| @@: ;else |
| png_error edi, [error_message] |
| .end0: |
| ret |
| endp |
| |
| PNG_MAX_ERROR_TEXT equ 196 ;Currently limited by profile_error in png.asm |
| if (PNG_WARNINGS_SUPPORTED eq 1) | \ |
| ((PNG_READ_SUPPORTED eq 1) & (PNG_ERROR_TEXT_SUPPORTED eq 1)) |
| ; 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, |
| ; which 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) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) |
| align 4 |
| png_digit db \ ;char[16] |
| '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', \ |
| 'A', 'B', 'C', 'D', 'E', 'F' |
| |
| ;void (png_const_structrp png_ptr, charp buffer, charp error_message) |
| align 4 |
| proc png_format_buffer, png_ptr:dword, buffer:dword, error_message:dword |
| ; uint_32 chunk_name = png_ptr->chunk_name; |
| ; int iout = 0, ishift = 24; |
| |
| ; while (ishift >= 0) |
| ; { |
| ; int c = (int)(chunk_name >> ishift) & 0xff; |
| |
| ; ishift -= 8; |
| ; if (isnonalpha(c) != 0) |
| ; { |
| ; buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET; |
| ; buffer[iout++] = png_digit[(c & 0xf0) >> 4]; |
| ; buffer[iout++] = png_digit[c & 0x0f]; |
| ; buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET; |
| ; } |
| |
| ; else |
| ; { |
| ; buffer[iout++] = (char)c; |
| ; } |
| ; } |
| |
| ; if (error_message == NULL) |
| ; buffer[iout] = '\0'; |
| |
| ; else |
| ; { |
| ; int iin = 0; |
| |
| ; buffer[iout++] = ':'; |
| ; buffer[iout++] = ' '; |
| |
| ; while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0') |
| ; buffer[iout++] = error_message[iin++]; |
| |
| ;iin < PNG_MAX_ERROR_TEXT, so the following is safe: |
| ; buffer[iout] = '\0'; |
| ; } |
| ret |
| endp |
| end if ;WARNINGS || ERROR_TEXT |
| |
| ;void (png_const_structrp png_ptr, charp error_message) |
| align 4 |
| proc png_chunk_error, png_ptr:dword, error_message:dword |
| ; char msg[18+PNG_MAX_ERROR_TEXT]; |
| ; if (png_ptr == NULL) |
| ; png_error(png_ptr, error_message); |
| |
| ; else |
| ; { |
| ; png_format_buffer(png_ptr, msg, error_message); |
| ; png_error(png_ptr, msg); |
| ; } |
| ret |
| endp |
| |
| ;void (png_const_structrp png_ptr, charp warning_message) |
| align 4 |
| proc png_chunk_warning, png_ptr:dword, warning_message:dword |
| ; char msg[18+PNG_MAX_ERROR_TEXT]; |
| ; if (png_ptr == NULL) |
| ; png_warning(png_ptr, warning_message); |
| |
| ; else |
| ; { |
| ; png_format_buffer(png_ptr, msg, warning_message); |
| ; png_warning(png_ptr, msg); |
| ; } |
| ret |
| endp |
| |
| ;void (png_const_structrp png_ptr, charp error_message) |
| align 4 |
| proc png_chunk_benign_error, png_ptr:dword, error_message:dword |
| ; if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0) |
| ; png_chunk_warning(png_ptr, error_message); |
| |
| ; else |
| ; png_chunk_error(png_ptr, error_message); |
| ret |
| endp |
| |
| ;void (png_const_structrp png_ptr, charp message, int error) |
| align 4 |
| proc png_chunk_report, png_ptr:dword, message:dword, error:dword |
| ; This is always supported, but for just read or just write it |
| ; unconditionally does the right thing. |
| |
| ;# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED) |
| ; if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) |
| ;# endif |
| |
| if PNG_READ_SUPPORTED eq 1 |
| ; { |
| ; if (error < PNG_CHUNK_ERROR) |
| ; png_chunk_warning(png_ptr, message); |
| |
| ; else |
| ; png_chunk_benign_error(png_ptr, message); |
| ; } |
| end if |
| |
| ;# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED) |
| ; else if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) |
| ;# endif |
| |
| if PNG_WRITE_SUPPORTED eq 1 |
| ; { |
| ; if (error < PNG_CHUNK_WRITE_ERROR) |
| ; png_app_warning(png_ptr, message); |
| ; |
| ; else |
| ; png_app_error(png_ptr, message); |
| ; } |
| end if |
| ret |
| endp |
| |
| ;void (png_const_structrp png_ptr, charp name) |
| align 4 |
| proc png_fixed_error, png_ptr:dword, name:dword |
| ;# define fixed_message "fixed point overflow in " |
| ;# define fixed_message_ln ((sizeof fixed_message)-1) |
| ; int iin; |
| ; char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT]; |
| ; memcpy(msg, fixed_message, fixed_message_ln); |
| ; iin = 0; |
| ; if (name != NULL) |
| ; while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0) |
| ; { |
| ; msg[fixed_message_ln + iin] = name[iin]; |
| ; ++iin; |
| ; } |
| ; msg[fixed_message_ln + iin] = 0; |
| ; png_error(png_ptr, msg); |
| ret |
| endp |
| |
| ; This API only exists if ANSI-C style error handling is used, |
| ; otherwise it is necessary for png_default_error to be overridden. |
| |
| ;jmp_buf* (png_structrp png_ptr, png_longjmp_ptr longjmp_fn, |
| ; size_t jmp_buf_size) |
| align 4 |
| proc png_set_longjmp_fn, png_ptr:dword, longjmp_fn:dword, jmp_buf_size:dword |
| ; From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value |
| ; and it must not change after that. Libpng doesn't care how big the |
| ; buffer is, just that it doesn't change. |
| |
| ; If the buffer size is no *larger* than the size of jmp_buf when libpng is |
| ; compiled a built in jmp_buf is returned; this preserves the pre-1.6.0 |
| ; semantics that this call will not fail. If the size is larger, however, |
| ; the buffer is allocated and this may fail, causing the function to return |
| ; NULL. |
| |
| ; if (png_ptr == NULL) |
| ; return NULL; |
| |
| ; if (png_ptr->jmp_buf_ptr == NULL) |
| ; { |
| ; png_ptr->jmp_buf_size = 0; /* not allocated */ |
| |
| ; if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local)) |
| ; png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; |
| |
| ; else |
| ; { |
| ; png_ptr->jmp_buf_ptr = png_malloc_warn(png_ptr, jmp_buf_size); |
| |
| ; if (png_ptr->jmp_buf_ptr == NULL) |
| ; return NULL; /* new NULL return on OOM */ |
| |
| ; png_ptr->jmp_buf_size = jmp_buf_size; |
| ; } |
| ; } |
| |
| ; else /* Already allocated: check the size */ |
| ; { |
| ; size_t size = png_ptr->jmp_buf_size; |
| |
| ; if (size == 0) |
| ; { |
| ; size = (sizeof png_ptr->jmp_buf_local); |
| ; if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local) |
| ; { |
| ; This is an internal error in libpng: somehow we have been left |
| ; with a stack allocated jmp_buf when the application regained |
| ; control. It's always possible to fix this up, but for the moment |
| ; this is a png_error because that makes it easy to detect. |
| |
| ; png_error(png_ptr, "Libpng jmp_buf still allocated"); |
| ; /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */ |
| ; } |
| ; } |
| |
| ; if (size != jmp_buf_size) |
| ; { |
| ; png_warning(png_ptr, "Application jmp_buf size changed"); |
| ; return NULL; /* caller will probably crash: no choice here */ |
| ; } |
| ; } |
| |
| ; Finally fill in the function, now we have a satisfactory buffer. It is |
| ; valid to change the function on every call. |
| |
| ; png_ptr->longjmp_fn = longjmp_fn; |
| ; return png_ptr->jmp_buf_ptr; |
| .end_f: |
| ret |
| endp |
| |
| ;void (png_structrp png_ptr) |
| align 4 |
| proc png_free_jmpbuf, png_ptr:dword |
| ; if (png_ptr != NULL) |
| ; { |
| ; jmp_buf *jb = png_ptr->jmp_buf_ptr; |
| |
| ; A size of 0 is used to indicate a local, stack, allocation of the |
| ; pointer; used here and in png.c |
| |
| ; if (jb != NULL && png_ptr->jmp_buf_size > 0) |
| ; { |
| |
| ; This stuff is so that a failure to free the error control structure |
| ; does not leave libpng in a state with no valid error handling: the |
| ; free always succeeds, if there is an error it gets ignored. |
| |
| ; if (jb != &png_ptr->jmp_buf_local) |
| ; { |
| ; /* Make an internal, libpng, jmp_buf to return here */ |
| ; jmp_buf free_jmp_buf; |
| |
| ; if (!setjmp(free_jmp_buf)) |
| ; { |
| ; png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */ |
| ; png_ptr->jmp_buf_size = 0; /* stack allocation */ |
| ; png_ptr->longjmp_fn = longjmp; |
| ; png_free(png_ptr, jb); /* Return to setjmp on error */ |
| ; } |
| ; } |
| ; } |
| |
| ; *Always* cancel everything out: |
| ; png_ptr->jmp_buf_size = 0; |
| ; png_ptr->jmp_buf_ptr = NULL; |
| ; png_ptr->longjmp_fn = 0; |
| ; } |
| ret |
| endp |
| |
| ; 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(). |
| |
| ;void (png_const_structrp png_ptr, charp error_message) |
| align 4 |
| proc png_default_error, png_ptr:dword, error_message:dword |
| if PNG_CONSOLE_IO_SUPPORTED eq 1 |
| if PNG_ERROR_NUMBERS_SUPPORTED eq 1 |
| ; Check on NULL only added in 1.5.4 |
| ; if (error_message != NULL && *error_message == PNG_LITERAL_SHARP) |
| ; { |
| ; Strip "#nnnn " from beginning of error message. |
| ; int offset; |
| ; char error_number[16]; |
| ; for (offset = 0; offset<15; offset++) |
| ; { |
| ; error_number[offset] = error_message[offset + 1]; |
| ; if (error_message[offset] == ' ') |
| ; break; |
| ; } |
| |
| ; if ((offset > 1) && (offset < 15)) |
| ; { |
| ; error_number[offset - 1] = '\0'; |
| ; fprintf(stderr, "libpng error no. %s: %s", |
| ; error_number, error_message + offset + 1); |
| ; fprintf(stderr, PNG_STRING_NEWLINE); |
| ; } |
| |
| ; else |
| ; { |
| ; fprintf(stderr, "libpng error: %s, offset=%d", |
| ; error_message, offset); |
| ; fprintf(stderr, PNG_STRING_NEWLINE); |
| ; } |
| ; } |
| ; else |
| end if |
| ; { |
| ; fprintf(stderr, "libpng error: %s", error_message ? error_message : |
| ; "undefined"); |
| ; fprintf(stderr, PNG_STRING_NEWLINE); |
| ; } |
| end if |
| ; png_longjmp(png_ptr, 1); |
| ret |
| endp |
| |
| ; 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. |
| |
| ;void (png_const_structrp png_ptr, charp warning_message) |
| align 4 |
| proc png_default_warning, png_ptr:dword, warning_message:dword |
| if PNG_CONSOLE_IO_SUPPORTED eq 1 |
| if PNG_ERROR_NUMBERS_SUPPORTED eq 1 |
| ; if (*warning_message == PNG_LITERAL_SHARP) |
| ; { |
| ; int offset; |
| ; char warning_number[16]; |
| ; for (offset = 0; offset < 15; offset++) |
| ; { |
| ; warning_number[offset] = warning_message[offset + 1]; |
| ; if (warning_message[offset] == ' ') |
| ; break; |
| ; } |
| |
| ; if ((offset > 1) && (offset < 15)) |
| ; { |
| ; warning_number[offset + 1] = '\0'; |
| ; fprintf(stderr, "libpng warning no. %s: %s", |
| ; warning_number, warning_message + offset); |
| ; fprintf(stderr, PNG_STRING_NEWLINE); |
| ; } |
| |
| ; else |
| ; { |
| ; fprintf(stderr, "libpng warning: %s", |
| ; warning_message); |
| ; fprintf(stderr, PNG_STRING_NEWLINE); |
| ; } |
| ; } |
| ; else |
| end if |
| ; { |
| ; fprintf(stderr, "libpng warning: %s", warning_message); |
| ; fprintf(stderr, PNG_STRING_NEWLINE); |
| ; } |
| end if |
| ret |
| endp |
| |
| ; 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->jmp_buf_ptr, 1) |
| |
| ;void (png_structrp png_ptr, voidp error_ptr, |
| ; png_error_ptr error_fn, png_error_ptr warning_fn) |
| align 4 |
| proc png_set_error_fn, png_ptr:dword, error_ptr:dword, error_fn:dword, warning_fn:dword |
| ; if (png_ptr == NULL) |
| ; return; |
| |
| ; png_ptr->error_ptr = error_ptr; |
| ; png_ptr->error_fn = error_fn; |
| if PNG_WARNINGS_SUPPORTED eq 1 |
| ; png_ptr->warning_fn = warning_fn; |
| end if |
| ret |
| endp |
| |
| |
| ; 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. |
| |
| ;voidp (png_const_structrp png_ptr) |
| align 4 |
| proc png_get_error_ptr, png_ptr:dword |
| ; if (png_ptr == NULL) |
| ; return NULL; |
| |
| ; return ((voidp)png_ptr->error_ptr); |
| ret |
| endp |
| |
| ;void (png_structrp png_ptr, uint_32 strip_mode) |
| align 4 |
| proc png_set_strip_error_numbers, png_ptr:dword, strip_mode:dword |
| ; if (png_ptr != NULL) |
| ; { |
| ; png_ptr->flags &= |
| ; ((~(PNG_FLAG_STRIP_ERROR_NUMBERS | |
| ; PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); |
| ; } |
| ret |
| endp |
| |
| ; Currently the above both depend on SETJMP_SUPPORTED, however it would be |
| ; possible to implement without setjmp support just so long as there is some |
| ; way to handle the error return here: |
| |
| ;void (png_structp png_nonconst_ptr, charp error_message) |
| align 4 |
| proc png_safe_error uses eax ebx, png_nonconst_ptr:dword, error_message:dword |
| mov ebx,[png_nonconst_ptr] |
| mov ebx,[ebx+png_struct.error_ptr] |
| ; An error is always logged here, overwriting anything (typically a warning) |
| ; that is already there: |
| |
| cmp ebx,0 |
| je .end0 ;if (..!=0) |
| stdcall png_safecat, dword[ebx+png_image.message], sizeof.png_image.message, 0, [error_message] |
| or dword[ebx+png_image.warning_or_error], PNG_IMAGE_ERROR |
| |
| ; Retrieve the jmp_buf from within the png_control, making this work for |
| ; C++ compilation too is pretty tricky: C++ wants a pointer to the first |
| ; element of a jmp_buf, but C doesn't tell us the type of that. |
| |
| ; if (image->opaque != NULL && image->opaque->error_buf != NULL) |
| ; longjmp(png_control_jmp_buf(image->opaque), 1); |
| |
| ; Missing longjmp buffer, the following is to help debugging: |
| ; { |
| ; size_t pos = png_safecat(image->message, (sizeof image->message), 0, |
| ; "bad longjmp: "); |
| ; png_safecat(image->message, (sizeof image->message), pos, |
| ; error_message); |
| ; } |
| .end0: |
| |
| ; Here on an internal programming error. |
| ; abort(); |
| ret |
| endp |
| |
| ;void (png_structp png_nonconst_ptr, charp warning_message) |
| align 4 |
| proc png_safe_warning uses eax ebx, png_nonconst_ptr:dword, warning_message:dword |
| mov ebx,[png_nonconst_ptr] |
| mov ebx,[ebx+png_struct.error_ptr] |
| |
| ; A warning is only logged if there is no prior warning or error. |
| cmp dword[ebx+png_image.warning_or_error],0 |
| jne @f ;if (..==0) |
| stdcall png_safecat, dword[ebx+png_image.message], sizeof.png_image.message, 0, [warning_message] |
| or dword[ebx+png_image.warning_or_error], PNG_IMAGE_WARNING |
| @@: |
| ret |
| endp |
| |
| ;int (png_imagep image_in, int (*function)(voidp), voidp arg) |
| align 4 |
| proc png_safe_execute uses ebx, image_in:dword, function:dword, arg:dword |
| ; volatile png_imagep image = image_in; |
| ; volatile int result; |
| ; volatile voidp saved_error_buf; |
| ; jmp_buf safe_jmpbuf; |
| |
| ; Safely execute function(arg) with png_error returning to this function. |
| mov ebx,[image_in] |
| ; saved_error_buf = image->opaque->error_buf; |
| ; result = setjmp(safe_jmpbuf) == 0; |
| |
| ; if (result != 0) |
| ; { |
| ; image->opaque->error_buf = safe_jmpbuf; |
| stdcall [function], [arg] |
| ; } |
| |
| ; image->opaque->error_buf = saved_error_buf; |
| |
| ; And do the cleanup prior to any failure return. |
| cmp eax,0 |
| jne @f ;if (..==0) |
| stdcall png_image_free, ebx |
| @@: |
| ret |
| endp |
| |