Re: Strange malloc/free issue inside a category
Re: Strange malloc/free issue inside a category
- Subject: Re: Strange malloc/free issue inside a category
- From: Ken Tozier <email@hidden>
- Date: Sun, 30 Jul 2006 22:36:34 -0400
FWIW, here are the hex encoder/decoder categories. I plan on looking
into Shawn E's base64 suggestion as well, but this (or an adaptation
of it) might prove useful to someone else.
Ken
@implementation NSData (Hex_Extensions)
- (NSString *) unicharHexStringFromData
{
int slen = [self length],
dlen = slen * 2;
unsigned char *ss = (unsigned char *) [self bytes],
*se = ss + slen;
unichar *dbuf = (unichar *) malloc (dlen * sizeof(unichar)),
*ds = dbuf,
ch;
while (ss < se)
{
ch = (*ss >> 4);
*ds = (ch < 0x0a) ? 0x30 + ch : 0x57 + ch ;
ds++;
ch = (*ss & 0x0f);
*ds = (ch < 0x0a) ? 0x30 + ch : 0x57 + ch ;
ds++;
ss++;
}
NSString *result = [NSString stringWithCharacters: dbuf length:
dlen];
free(dbuf);
return result;
}
@end
@implementation NSString (Hex_Extensions)
- (NSData *) dataFromUnicharHexString
{
int slen = [self length],
dlen = slen / 2;
unichar *sbuf = (unichar *) malloc(slen * sizeof(unichar)),
*ss = sbuf,
*se = ss + slen;
unsigned char *dbuf = (unsigned char *) malloc(dlen),
*ds = dbuf,
ch;
[self getCharacters: sbuf];
while (ss < se)
{
ch = (*ss < 0x3a) ? (*ss - 0x30) << 4 : (*ss - 0x57) << 4 ;
ss++;
ch |= (*ss < 0x3a) ? *ss - 0x30 : *ss - 0x57 ;
ss++;
*ds = ch;
ds++;
}
NSData *result = [NSData dataWithBytes: dbuf length: dlen];
free(sbuf);
free(dbuf);
return result;
}
@end
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