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Imported from libpng-0.97a.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-01-03 22:40:55 -06:00
parent b6ce43d6ff
commit 70e3f543f1
14 changed files with 460 additions and 135 deletions
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54
pngerror.c
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@@ -51,6 +51,60 @@ png_warning(png_structp png_ptr, png_const_charp message)
png_default_warning(png_ptr, message);
}
/* These utilities are used internally to build an error message which 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 const char png_digit[16] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
static void
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 & 0xf];
buffer[iout++] = ']';
} else {
buffer[iout++] = c;
}
}
if (message == NULL)
buffer[iout++] = 0;
else {
buffer[iout++] = ':';
buffer[iout++] = ' ';
strncpy(buffer+iout, message, 64);
buffer[iout+63] = 0;
}
}
void
png_chunk_error(png_structp png_ptr, png_const_charp message)
{
char msg[16+64];
png_format_buffer(png_ptr, msg, message);
png_error(png_ptr, msg);
}
void
png_chunk_warning(png_structp png_ptr, png_const_charp message)
{
char msg[16+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