mirror of
https://github.com/samuelclay/NewsBlur.git
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208 lines
7.5 KiB
Objective-C
Executable file
208 lines
7.5 KiB
Objective-C
Executable file
//
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// NSData+OSKDerp.m
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// DerpKit
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//
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// Created by Steve Streza on 7/15/12.
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// Copyright (c) 2012 Steve Streza
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#import "NSData+OSKDerp.h"
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NSUInteger OSKDerpKitBase64encode_len(NSUInteger len);
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int OSKDerpKitBase64encode(char * coded_dst, const char *plain_src, NSUInteger len_plain_src);
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NSUInteger OSKDerpKitBase64decode_len(const char * coded_src);
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int OSKDerpKitBase64decode(char * plain_dst, const char *coded_src);
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static const char OSKDerpKitBase64EncodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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@implementation NSData (OSKDerp)
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-(NSString *)osk_derp_stringByBase64EncodingData{
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if ([self length] == 0)
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return @"";
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char *characters = malloc((([self length] + 2) / 3) * 4);
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if (characters == NULL)
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return nil;
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NSUInteger length = 0;
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NSUInteger i = 0;
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while (i < [self length])
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{
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char buffer[3] = {0,0,0};
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short bufferLength = 0;
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while (bufferLength < 3 && i < [self length])
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buffer[bufferLength++] = ((char *)[self bytes])[i++];
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// Encode the bytes in the buffer to four characters, including padding "=" characters if necessary.
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characters[length++] = OSKDerpKitBase64EncodingTable[(buffer[0] & 0xFC) >> 2];
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characters[length++] = OSKDerpKitBase64EncodingTable[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];
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if (bufferLength > 1)
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characters[length++] = OSKDerpKitBase64EncodingTable[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];
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else characters[length++] = '=';
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if (bufferLength > 2)
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characters[length++] = OSKDerpKitBase64EncodingTable[buffer[2] & 0x3F];
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else characters[length++] = '=';
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}
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return [[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES];
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}
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-(NSString *)osk_derp_stringByBase64DecodingData{
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const void *inBytes = [self bytes];
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int outLength = (int)(OSKDerpKitBase64decode_len(inBytes));
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void *outBytes = malloc(outLength);
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OSKDerpKitBase64decode(outBytes, inBytes);
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NSData *outData = [NSData dataWithBytesNoCopy:outBytes length:outLength freeWhenDone:YES];
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return [[NSString alloc] initWithData:outData encoding:NSASCIIStringEncoding];
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}
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-(NSString *)osk_derp_UTF8String{
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return [[NSString alloc] initWithData:self encoding:NSUTF8StringEncoding];
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}
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@end
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#include <string.h>
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static const unsigned char OSKDerpKitBase64_pr2six[256] =
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{
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/* ASCII table */
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
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64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
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64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
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};
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NSUInteger OSKDerpKitBase64decode_len(const char *bufcoded)
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{
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int nbytesdecoded;
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register const unsigned char *bufin;
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register int nprbytes;
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bufin = (const unsigned char *) bufcoded;
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while (OSKDerpKitBase64_pr2six[*(bufin++)] <= 63);
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nprbytes = (int)((bufin - (const unsigned char *) bufcoded) - 1);
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nbytesdecoded = ((nprbytes + 3) / 4) * 3;
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return nbytesdecoded + 1;
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}
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int OSKDerpKitBase64decode(char *bufplain, const char *bufcoded)
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{
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int nbytesdecoded;
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register const unsigned char *bufin;
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register unsigned char *bufout;
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register int nprbytes;
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bufin = (const unsigned char *) bufcoded;
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while (OSKDerpKitBase64_pr2six[*(bufin++)] <= 63);
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nprbytes = (int)((bufin - (const unsigned char *) bufcoded) - 1);
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nbytesdecoded = ((nprbytes + 3) / 4) * 3;
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bufout = (unsigned char *) bufplain;
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bufin = (const unsigned char *) bufcoded;
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while (nprbytes > 4) {
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*(bufout++) =
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(unsigned char) (OSKDerpKitBase64_pr2six[*bufin] << 2 | OSKDerpKitBase64_pr2six[bufin[1]] >> 4);
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*(bufout++) =
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(unsigned char) (OSKDerpKitBase64_pr2six[bufin[1]] << 4 | OSKDerpKitBase64_pr2six[bufin[2]] >> 2);
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*(bufout++) =
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(unsigned char) (OSKDerpKitBase64_pr2six[bufin[2]] << 6 | OSKDerpKitBase64_pr2six[bufin[3]]);
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bufin += 4;
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nprbytes -= 4;
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}
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/* Note: (nprbytes == 1) would be an error, so just ingore that case */
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if (nprbytes > 1) {
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*(bufout++) =
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(unsigned char) (OSKDerpKitBase64_pr2six[*bufin] << 2 | OSKDerpKitBase64_pr2six[bufin[1]] >> 4);
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}
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if (nprbytes > 2) {
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*(bufout++) =
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(unsigned char) (OSKDerpKitBase64_pr2six[bufin[1]] << 4 | OSKDerpKitBase64_pr2six[bufin[2]] >> 2);
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}
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if (nprbytes > 3) {
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*(bufout++) =
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(unsigned char) (OSKDerpKitBase64_pr2six[bufin[2]] << 6 | OSKDerpKitBase64_pr2six[bufin[3]]);
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}
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*(bufout++) = '\0';
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nbytesdecoded -= (4 - nprbytes) & 3;
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return nbytesdecoded;
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}
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static const char OSKDerpKitBase64_basis64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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NSUInteger OSKDerpKitBase64encode_len(NSUInteger len)
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{
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return ((len + 2) / 3 * 4) + 1;
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}
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int OSKDerpKitBase64encode(char *encoded, const char *string, NSUInteger len)
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{
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int i;
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char *p;
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p = encoded;
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for (i = 0; i < len - 2; i += 3) {
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*p++ = OSKDerpKitBase64_basis64[(string[i] >> 2) & 0x3F];
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*p++ = OSKDerpKitBase64_basis64[((string[i] & 0x3) << 4) |
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((int) (string[i + 1] & 0xF0) >> 4)];
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*p++ = OSKDerpKitBase64_basis64[((string[i + 1] & 0xF) << 2) |
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((int) (string[i + 2] & 0xC0) >> 6)];
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*p++ = OSKDerpKitBase64_basis64[string[i + 2] & 0x3F];
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}
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if (i < len) {
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*p++ = OSKDerpKitBase64_basis64[(string[i] >> 2) & 0x3F];
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if (i == (len - 1)) {
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*p++ = OSKDerpKitBase64_basis64[((string[i] & 0x3) << 4)];
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*p++ = '=';
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}
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else {
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*p++ = OSKDerpKitBase64_basis64[((string[i] & 0x3) << 4) |
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((int) (string[i + 1] & 0xF0) >> 4)];
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*p++ = OSKDerpKitBase64_basis64[((string[i + 1] & 0xF) << 2)];
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}
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*p++ = '=';
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}
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*p++ = '\0';
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return (int)(p - encoded);
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}
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