mirror of
https://github.com/gnustep/libs-base.git
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aa846fe651
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@15688 72102866-910b-0410-8b05-ffd578937521
424 lines
13 KiB
Objective-C
424 lines
13 KiB
Objective-C
/* Implementation of extension methods to standard classes
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Copyright (C) 2003 Free Software Foundation, Inc.
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Written by: Richard Frith-Macdonald <rfm@gnu.org>
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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*/
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#include <config.h>
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#include <Foundation/Foundation.h>
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/**
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* Extension methods for the NSCalendarDate class
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*/
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@implementation NSCalendarDate (GSCategories)
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/**
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* The ISO standard week of the year is based on the first week of the
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* year being that week (starting on monday) for which the thursday
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* is on or after the first of january.<br />
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* This has the effect that, if january first is a friday, saturday or
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* sunday, the days of that week (up to and including the sunday) are
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* considered to be in week 53 of the preceeding year. Similarly if the
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* last day of the year is a monday tuesday or wednesday, these days are
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* part of week 1 of the next year.
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*/
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- (int) weekOfYear
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{
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int dayOfWeek = [self dayOfWeek];
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int dayOfYear;
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/*
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* Whether a week is considered to be in a year or not depends on its
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* thursday ... so find thursday for the receivers week.
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* NB. this may result in a date which is not in the same year as the
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* receiver.
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*/
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if (dayOfWeek != 4)
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{
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CREATE_AUTORELEASE_POOL(arp);
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NSCalendarDate *thursday;
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/*
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* A week starts on monday ... so adjust from 0 to 7 so that a
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* sunday is counted as the last day of the week.
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*/
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if (dayOfWeek == 0)
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{
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dayOfWeek = 7;
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}
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thursday = [self dateByAddingYears: 0
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months: 0
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days: 4 - dayOfWeek
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hours: 0
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minutes: 0
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seconds: 0];
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dayOfYear = [thursday dayOfYear];
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RELEASE(arp);
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}
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else
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{
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dayOfYear = [self dayOfYear];
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}
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/*
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* Round up to a week boundary, so that when we divide by seven we
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* get a result in the range 1 to 53 as mandated by the ISO standard.
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*/
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dayOfYear += (7 - dayOfYear % 7);
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return dayOfYear / 7;
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}
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@end
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/**
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* Extension methods for the NSData class
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*/
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@implementation NSData (GSCategories)
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/**
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* Returns an NSString object containing an ASCII hexadecimal representation
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* of the receiver. This means that the returned object will contain
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* exactly twice as many characters as there are bytes as the receiver,
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* as each byte in the receiver is represented by two hexadecimal digits.<br />
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* The high order four bits of each byte is encoded before the low
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* order four bits. Capital letters 'A' to 'F' are used to represent
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* values from 10 to 15.<br />
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* If you need the hexadecimal representation as raw byte data, use code
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* like -
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* <example>
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* hexData = [[sourceData hexadecimalRepresentation]
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* dataUsingEncoding: NSASCIIStringEncoding];
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* </example>
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*/
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- (NSString*) hexadecimalRepresentation
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{
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static const char *hexChars = "0123456789ABCDEF";
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unsigned slen = [self length];
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unsigned dlen = slen * 2;
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const unsigned char *src = (const unsigned char *)[self bytes];
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char *dst = (char*)NSZoneMalloc(NSDefaultMallocZone(), dlen);
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unsigned spos = 0;
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unsigned dpos = 0;
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NSData *data;
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NSString *string;
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while (spos < slen)
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{
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unsigned char c = src[spos++];
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dst[dpos++] = hexChars[(c >> 4) & 0x0f];
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dst[dpos++] = hexChars[c & 0x0f];
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}
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data = [NSData allocWithZone: NSDefaultMallocZone()];
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data = [data initWithBytesNoCopy: dst length: dlen freeWhenDone: YES];
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string = [[NSString alloc] initWithData: data
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encoding: NSASCIIStringEncoding];
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RELEASE(data);
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return AUTORELEASE(string);
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}
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struct MD5Context
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{
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unsigned long buf[4];
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unsigned long bits[2];
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unsigned char in[64];
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};
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static void MD5Init (struct MD5Context *context);
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static void MD5Update (struct MD5Context *context, unsigned char const *buf,
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unsigned len);
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static void MD5Final (unsigned char digest[16], struct MD5Context *context);
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static void MD5Transform (unsigned long buf[4], unsigned long const in[16]);
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/*
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* This code implements the MD5 message-digest algorithm.
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* The algorithm is due to Ron Rivest. This code was
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* written by Colin Plumb in 1993, no copyright is claimed.
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* This code is in the public domain; do with it what you wish.
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*
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* Equivalent code is available from RSA Data Security, Inc.
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* This code has been tested against that, and is equivalent,
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* except that you don't need to include two pages of legalese
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* with every copy.
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*
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* To compute the message digest of a chunk of bytes, declare an
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* MD5Context structure, pass it to MD5Init, call MD5Update as
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* needed on buffers full of bytes, and then call MD5Final, which
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* will fill a supplied 16-byte array with the digest.
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*/
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/*
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* Ensure data is little-endian
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*/
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static void littleEndian (void *buf, unsigned longs)
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{
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unsigned long *ptr = (unsigned long*)buf;
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do
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{
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*ptr = NSSwapHostLongToLittle(*ptr);
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ptr++;
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}
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while (--longs);
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}
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/*
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* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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* initialization constants.
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*/
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static void MD5Init (struct MD5Context *ctx)
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{
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ctx->buf[0] = 0x67452301;
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ctx->buf[1] = 0xefcdab89;
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ctx->buf[2] = 0x98badcfe;
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ctx->buf[3] = 0x10325476;
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ctx->bits[0] = 0;
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ctx->bits[1] = 0;
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}
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/*
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* Update context to reflect the concatenation of another buffer full
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* of bytes.
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*/
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static void MD5Update (struct MD5Context *ctx, unsigned char const *buf,
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unsigned len)
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{
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unsigned long t;
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/* Update bitcount */
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t = ctx->bits[0];
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if ((ctx->bits[0] = t + ((unsigned long) len << 3)) < t)
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ctx->bits[1]++; /* Carry from low to high */
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ctx->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
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/* Handle any leading odd-sized chunks */
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if (t)
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{
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unsigned char *p = (unsigned char *) ctx->in + t;
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t = 64 - t;
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if (len < t)
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{
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memcpy (p, buf, len);
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return;
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}
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memcpy (p, buf, t);
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littleEndian (ctx->in, 16);
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MD5Transform (ctx->buf, (unsigned long *) ctx->in);
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buf += t;
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len -= t;
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}
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/* Process data in 64-byte chunks */
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while (len >= 64)
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{
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memcpy (ctx->in, buf, 64);
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littleEndian (ctx->in, 16);
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MD5Transform (ctx->buf, (unsigned long *) ctx->in);
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buf += 64;
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len -= 64;
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}
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/* Handle any remaining bytes of data. */
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memcpy (ctx->in, buf, len);
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}
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/*
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* Final wrapup - pad to 64-byte boundary with the bit pattern
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* 1 0* (64-bit count of bits processed, MSB-first)
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*/
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static void MD5Final (unsigned char digest[16], struct MD5Context *ctx)
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{
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unsigned count;
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unsigned char *p;
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/* Compute number of bytes mod 64 */
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count = (ctx->bits[0] >> 3) & 0x3F;
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/* Set the first char of padding to 0x80. This is safe since there is
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always at least one byte free */
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p = ctx->in + count;
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*p++ = 0x80;
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/* Bytes of padding needed to make 64 bytes */
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count = 64 - 1 - count;
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/* Pad out to 56 mod 64 */
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if (count < 8)
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{
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/* Two lots of padding: Pad the first block to 64 bytes */
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memset (p, 0, count);
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littleEndian (ctx->in, 16);
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MD5Transform (ctx->buf, (unsigned long *) ctx->in);
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/* Now fill the next block with 56 bytes */
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memset (ctx->in, 0, 56);
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}
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else
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{
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/* Pad block to 56 bytes */
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memset (p, 0, count - 8);
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}
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littleEndian (ctx->in, 14);
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/* Append length in bits and transform */
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((unsigned long *) ctx->in)[14] = ctx->bits[0];
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((unsigned long *) ctx->in)[15] = ctx->bits[1];
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MD5Transform (ctx->buf, (unsigned long *) ctx->in);
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littleEndian ((unsigned char *) ctx->buf, 4);
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memcpy (digest, ctx->buf, 16);
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memset (ctx, 0, sizeof (ctx)); /* In case it's sensitive */
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}
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/* The four core functions - F1 is optimized somewhat */
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/* #define F1(x, y, z) (x & y | ~x & z) */
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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/* This is the central step in the MD5 algorithm. */
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#define MD5STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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/*
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* The core of the MD5 algorithm, this alters an existing MD5 hash to
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* reflect the addition of 16 longwords of new data. MD5Update blocks
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* the data and converts bytes into longwords for this routine.
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*/
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static void MD5Transform (unsigned long buf[4], unsigned long const in[16])
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{
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register unsigned long a, b, c, d;
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a = buf[0];
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b = buf[1];
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c = buf[2];
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d = buf[3];
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MD5STEP (F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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MD5STEP (F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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MD5STEP (F1, c, d, a, b, in[2] + 0x242070db, 17);
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MD5STEP (F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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MD5STEP (F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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MD5STEP (F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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MD5STEP (F1, c, d, a, b, in[6] + 0xa8304613, 17);
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MD5STEP (F1, b, c, d, a, in[7] + 0xfd469501, 22);
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MD5STEP (F1, a, b, c, d, in[8] + 0x698098d8, 7);
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MD5STEP (F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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MD5STEP (F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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MD5STEP (F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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MD5STEP (F1, a, b, c, d, in[12] + 0x6b901122, 7);
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MD5STEP (F1, d, a, b, c, in[13] + 0xfd987193, 12);
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MD5STEP (F1, c, d, a, b, in[14] + 0xa679438e, 17);
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MD5STEP (F1, b, c, d, a, in[15] + 0x49b40821, 22);
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MD5STEP (F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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MD5STEP (F2, d, a, b, c, in[6] + 0xc040b340, 9);
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MD5STEP (F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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MD5STEP (F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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MD5STEP (F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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MD5STEP (F2, d, a, b, c, in[10] + 0x02441453, 9);
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MD5STEP (F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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MD5STEP (F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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MD5STEP (F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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MD5STEP (F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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MD5STEP (F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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MD5STEP (F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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MD5STEP (F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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MD5STEP (F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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MD5STEP (F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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MD5STEP (F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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MD5STEP (F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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MD5STEP (F3, d, a, b, c, in[8] + 0x8771f681, 11);
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MD5STEP (F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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MD5STEP (F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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MD5STEP (F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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MD5STEP (F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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MD5STEP (F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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MD5STEP (F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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MD5STEP (F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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MD5STEP (F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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MD5STEP (F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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MD5STEP (F3, b, c, d, a, in[6] + 0x04881d05, 23);
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MD5STEP (F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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MD5STEP (F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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MD5STEP (F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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MD5STEP (F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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MD5STEP (F4, a, b, c, d, in[0] + 0xf4292244, 6);
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MD5STEP (F4, d, a, b, c, in[7] + 0x432aff97, 10);
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MD5STEP (F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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MD5STEP (F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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MD5STEP (F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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MD5STEP (F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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MD5STEP (F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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MD5STEP (F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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MD5STEP (F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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MD5STEP (F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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MD5STEP (F4, c, d, a, b, in[6] + 0xa3014314, 15);
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MD5STEP (F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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MD5STEP (F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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MD5STEP (F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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MD5STEP (F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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MD5STEP (F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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/**
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* Creates an MD5 digest of the information stored in the receiver and
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* returns it as an autoreleased 16 byte NSData object.<br />
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* If you need to produce a digest of string information, you need to
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* decide what character encoding is to be used and convert your string
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* to a data object of that encoding type first using the
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* [NSString-dataUsingEncoding:] method -
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* <example>
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* myDigest = [[myString dataUsingEncoding: NSUTF8StringEncoding] md5Digest];
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* </example>
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* If you need to use the digest in a human readable form, you will
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* probably want it to be seen as 32 hexadecimal digits, and can do that
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* using the -hexadecimalRepresentation method.
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*/
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- (NSData*) md5Digest
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{
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struct MD5Context ctx;
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unsigned char digest[16];
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MD5Init(&ctx);
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MD5Update(&ctx, [self bytes], [self length]);
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MD5Final(digest, &ctx);
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return [NSData dataWithBytes: digest length: 16];
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}
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@end
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