168 lines
4.5 KiB
Objective-C
168 lines
4.5 KiB
Objective-C
//
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// Base64.m
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//
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// Version 1.2
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//
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// Created by Nick Lockwood on 12/01/2012.
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// Copyright (C) 2012 Charcoal Design
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//
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// Distributed under the permissive zlib License
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// Get the latest version from here:
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//
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// https://github.com/nicklockwood/Base64
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an aacknowledgment in the product documentation would be
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// appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not be
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// misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source distribution.
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//
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#import "Base64.h"
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#pragma GCC diagnostic ignored "-Wselector"
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#import <Availability.h>
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#if !__has_feature(objc_arc)
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#error This library requires automatic reference counting
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#endif
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@implementation NSData (Base64)
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+ (NSData *)dataWithBase64EncodedString:(NSString *)string
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{
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if (![string length]) return nil;
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NSData *decoded = nil;
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#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0
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if (![NSData instancesRespondToSelector:@selector(initWithBase64EncodedString:options:)])
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{
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decoded = [[self alloc] initWithBase64Encoding:[string stringByReplacingOccurrencesOfString:@"[^A-Za-z0-9+/=]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [string length])]];
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}
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else
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#endif
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{
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decoded = [[self alloc] initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];
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}
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return [decoded length]? decoded: nil;
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}
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- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth
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{
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if (![self length]) return nil;
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NSString *encoded = nil;
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#if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0
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if (![NSData instancesRespondToSelector:@selector(base64EncodedStringWithOptions:)])
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{
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encoded = [self base64Encoding];
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}
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else
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#endif
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{
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switch (wrapWidth)
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{
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case 64:
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{
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return [self base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
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}
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case 76:
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{
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return [self base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];
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}
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default:
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{
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encoded = [self base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)0];
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}
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}
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}
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if (!wrapWidth || wrapWidth >= [encoded length])
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{
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return encoded;
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}
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wrapWidth = (wrapWidth / 4) * 4;
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NSMutableString *result = [NSMutableString string];
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for (NSUInteger i = 0; i < [encoded length]; i+= wrapWidth)
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{
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if (i + wrapWidth >= [encoded length])
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{
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[result appendString:[encoded substringFromIndex:i]];
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break;
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}
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[result appendString:[encoded substringWithRange:NSMakeRange(i, wrapWidth)]];
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[result appendString:@"\r\n"];
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}
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return result;
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}
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- (NSString *)base64EncodedString
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{
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return [self base64EncodedStringWithWrapWidth:0];
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}
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@end
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@implementation NSString (Base64)
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+ (NSString *)stringWithBase64EncodedString:(NSString *)string
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{
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NSData *data = [NSData dataWithBase64EncodedString:string];
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if (data)
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{
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return [[self alloc] initWithData:data encoding:NSUTF8StringEncoding];
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}
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return nil;
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}
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- (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth
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{
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NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
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return [data base64EncodedStringWithWrapWidth:wrapWidth];
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}
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- (NSString *)base64EncodedString
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{
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NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
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return [data base64EncodedString];
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}
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- (NSString *)base64DecodedString
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{
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return [NSString stringWithBase64EncodedString:self];
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}
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- (NSData *)base64DecodedData
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{
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return [NSData dataWithBase64EncodedString:self];
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}
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@end
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