; 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