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//
// GTMStringEncoding.h
//
// Copyright 2010 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import <Foundation/Foundation.h>
#import "GTMDefines.h"
// A generic class for arbitrary base-2 to 128 string encoding and decoding.
@interface GTMStringEncoding : NSObject {
@private
NSData *charMapData_;
char *charMap_;
int reverseCharMap_[128];
int shift_;
int mask_;
BOOL doPad_;
char paddingChar_;
int padLen_;
}
// Create a new, autoreleased GTMStringEncoding object with a standard encoding.
+ (id)binaryStringEncoding;
+ (id)hexStringEncoding;
+ (id)rfc4648Base32StringEncoding;
+ (id)rfc4648Base32HexStringEncoding;
+ (id)crockfordBase32StringEncoding;
+ (id)rfc4648Base64StringEncoding;
+ (id)rfc4648Base64WebsafeStringEncoding;
// Create a new, autoreleased GTMStringEncoding object with the given string,
// as described below.
+ (id)stringEncodingWithString:(NSString *)string;
// Initialize a new GTMStringEncoding object with the string.
//
// The length of the string must be a power of 2, at least 2 and at most 128.
// Only 7-bit ASCII characters are permitted in the string.
//
// These characters are the canonical set emitted during encoding.
// If the characters have alternatives (e.g. case, easily transposed) then use
// addDecodeSynonyms: to configure them.
- (id)initWithString:(NSString *)string;
// Add decoding synonyms as specified in the synonyms argument.
//
// It should be a sequence of one previously reverse mapped character,
// followed by one or more non-reverse mapped character synonyms.
// Only 7-bit ASCII characters are permitted in the string.
//
// e.g. If a GTMStringEncoder object has already been initialised with a set
// of characters excluding I, L and O (to avoid confusion with digits) and you
// want to accept them as digits you can call addDecodeSynonyms:@"0oO1iIlL".
- (void)addDecodeSynonyms:(NSString *)synonyms;
// A sequence of characters to ignore if they occur during encoding.
// Only 7-bit ASCII characters are permitted in the string.
- (void)ignoreCharacters:(NSString *)chars;
// Indicates whether padding is performed during encoding.
- (BOOL)doPad;
- (void)setDoPad:(BOOL)doPad;
// Sets the padding character to use during encoding.
- (void)setPaddingChar:(char)c;
// Encode a raw binary buffer to a 7-bit ASCII string.
- (NSString *)encode:(NSData *)data;
- (NSString *)encodeString:(NSString *)string;
// Decode a 7-bit ASCII string to a raw binary buffer.
- (NSData *)decode:(NSString *)string;
- (NSString *)stringByDecoding:(NSString *)string;
@end
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