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; 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.)

; For conditions of distribution and use, see the disclaimer

; and license in png.h

; 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.

; 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 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;

;            {

;               int i;

;               for (i = 0; i < offset - 1; i++)

;                  msg[i] = error_message[i + 1];

;               msg[i - 1] = '\0';

;               error_message = msg;

;            }

;               error_message += offset;

;         }

;         {

;            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);

	; 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.

;      (*(png_ptr->error_fn))(png_ptr, "");

	; use the default handler, which will not return.

;   png_default_error(png_ptr, "");

;}

;end if /* ERROR_TEXT */

; error checking is not required in the caller.

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

; 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.

;    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) */

;    * number zero.

;   {

;      {

;         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;

;            /* Expects at least 2 digits. */

;            mincount = 2;

;            /* FALL THROUGH */

;            *--end = digits[number % 10];

;            number /= 10;

;            break;

;            /* This format expects at least two digits */

;            mincount = 2;

;            /* FALL THROUGH */

;            *--end = digits[number & 0xf];

;            number >>= 4;

;            break;

;            number = 0;

;            break;

;      }

;      ++count;

;      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.

;            *--end = '.';

;         else if (number == 0) /* and !output */

;            *--end = '0';

;      }

;   }

;}

;end if

; 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.

;{

;   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);

;}

; PNG_WARNING_PARAMETER_COUNT parameters.  In the format string the parameter

; is introduced by @, where 'number' starts at 1.  This follows the

; standard established by X/Open for internationalizable error messages.

;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);

;}

;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));

;}

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];

;   u = (png_alloc_size_t)value;

;   if (value < 0)

;      u = ~u + 1;

;      *--str = '-';

	ret

endp

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.

;   char msg[192];

	; 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.

;   {

	; '@' 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 @.

;      {

;         int parameter_char = *++message; /* Consume the '@' */

;         char valid_parameters[] = "123456789";

;         int parameter = 0;

		; parameter to use.

;            valid_parameters[parameter] != '\0')

;            ++parameter;

;         if (parameter < PNG_WARNING_PARAMETER_COUNT)

;         {

		; Append this parameter

;            charp parm = p[parameter];

;            charp pend = p[parameter] + (sizeof p[parameter]);

		; that parm[] has been initialized, so there is no guarantee of a

		; trailing '\0':

;               msg[i++] = *parm++;

;            ++message;

;            continue;

;         }

	; copy that.  This is known not to be '\0' because of the test above.

	; above where there is a lone '@' at the end of the message string.

;   }

;   msg[i] = '\0';

	; PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these

	; are not (currently) formatted.

	ret

endp

;end if /* WARNINGS */

;{

;   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);

;   }

;   {

;#     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);

;   }

;}

;{

;   if ((png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) != 0)

;      png_warning(png_ptr, error_message);

;   else

;      png_error(png_ptr, 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

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.

align 4

png_digit db \ ;char[16]

	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', \

	'A', 'B', 'C', 'D', 'E', 'F'

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;

;   {

;      int c = (int)(chunk_name >> ishift) & 0xff;

;      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;

;      }

;      {

;         buffer[iout++] = (char)c;

;      }

;   }

;      buffer[iout] = '\0';

;   {

;      int iin = 0;

;      buffer[iout++] = ' ';

;         buffer[iout++] = error_message[iin++];

;      buffer[iout] = '\0';

;   }

	ret

endp

end if ;WARNINGS || ERROR_TEXT

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);

;   {

;      png_format_buffer(png_ptr, msg, error_message);

;      png_error(png_ptr, msg);

;   }

	ret

endp

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);

;   {

;      png_format_buffer(png_ptr, msg, warning_message);

;      png_warning(png_ptr, msg);

;   }

	ret

endp

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);

;      png_chunk_error(png_ptr, error_message);

	ret

endp

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 ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)

;#  endif

;      {

;         if (error < PNG_CHUNK_ERROR)

;            png_chunk_warning(png_ptr, message);

;            png_chunk_benign_error(png_ptr, message);

;      }

end if

;      else if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)

;#  endif

;      {

;         if (error < PNG_CHUNK_WRITE_ERROR)

;            png_app_warning(png_ptr, message);

;

;         else

;            png_app_error(png_ptr, message);

;      }

end if

	ret

endp

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

; otherwise it is necessary for png_default_error to be overridden.

;    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.

	; 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.

;      return NULL;

;   {

;      png_ptr->jmp_buf_size = 0; /* not allocated */

;         png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local;

;      {

;         png_ptr->jmp_buf_ptr = png_malloc_warn(png_ptr, jmp_buf_size);

;            return NULL; /* new NULL return on OOM */

;      }

;   }

;   {

;      size_t size = png_ptr->jmp_buf_size;

;      {

;         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_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */

;         }

;      }

;      {

;         png_warning(png_ptr, "Application jmp_buf size changed");

;         return NULL; /* caller will probably crash: no choice here */

;      }

;   }

	; valid to change the function on every call.

;   return png_ptr->jmp_buf_ptr;

.end_f:

	ret

endp

align 4

proc png_free_jmpbuf, png_ptr:dword

;   if (png_ptr != NULL)

;   {

;      jmp_buf *jb = png_ptr->jmp_buf_ptr;

		; pointer; used here and in png.c

;      {

			; does not leave libpng in a state with no valid error handling: the

			; free always succeeds, if there is an error it gets ignored.

;         {

;            /* Make an internal, libpng, jmp_buf to return here */

;            jmp_buf 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 */

;            }

;         }

;      }

;      png_ptr->jmp_buf_size = 0;

;      png_ptr->jmp_buf_ptr = NULL;

;      png_ptr->longjmp_fn = 0;

;   }

	ret

endp

; 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().

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;

;      }

;      {

;         error_number[offset - 1] = '\0';

;         fprintf(stderr, "libpng error no. %s: %s",

;             error_number, error_message + offset + 1);

;         fprintf(stderr, PNG_STRING_NEWLINE);

;      }

;      {

;         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

; 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.

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;

;      }

;      {

;         warning_number[offset + 1] = '\0';

;         fprintf(stderr, "libpng warning no. %s: %s",

;             warning_number, warning_message + offset);

;         fprintf(stderr, PNG_STRING_NEWLINE);

;      }

;      {

;         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

; 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)

;    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_fn = error_fn;

if PNG_WARNINGS_SUPPORTED eq 1

;   png_ptr->warning_fn = warning_fn;

end if

	ret

endp

; functions.  The application should free any memory associated with this

; pointer before png_write_destroy and png_read_destroy are called.

align 4

proc png_get_error_ptr, png_ptr:dword

;   if (png_ptr == NULL)

;      return NULL;

	ret

endp

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

; possible to implement without setjmp support just so long as there is some

; way to handle the error return here:

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:

	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

		; 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.

;         longjmp(png_control_jmp_buf(image->opaque), 1);

;      {

;         size_t pos = png_safecat(image->message, (sizeof image->message), 0,

;             "bad longjmp: ");

;         png_safecat(image->message, (sizeof image->message), pos,

;             error_message);

;      }

	.end0:

;   abort();

	ret

endp

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]

	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

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;

	mov ebx,[image_in]

;   saved_error_buf = image->opaque->error_buf;

;   result = setjmp(safe_jmpbuf) == 0;

;   {

;      image->opaque->error_buf = safe_jmpbuf;

		stdcall [function], [arg]

;   }

	cmp eax,0

	jne @f ;if (..==0)

		stdcall png_image_free, ebx

	@@:

	ret

endp

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