[英]How to Convert NSInteger or NSString to a binary (string) value
[英]Convert NSString to binary string
我有一個NSString代表一些數據的sha1哈希,我需要將它轉換為二進制字符串,但無法找到任何好的解決方案來做到這一點。 它應該等同於PHP的pack函數。
結果應該是這樣的:0xb7,0xc7,0x91,...,0x90。
我需要將此二進制文件轉換為base64編碼的字符串。
您可以使用NSString+Base64
目錄輕松完成此操作。 代碼應該是這樣的:
#import "NSString+base64.h"
//....
//some codes
//....
NSString *yourNSString = @"Some string you want to be encoded";
NSString *base64string = [yourNSString base64String];
這是NSString + Base64.h文件的代碼,例如:
//
// NSString+Base64.h
// HudsonGrowl
//
// Created by Benjamin Broll on 06.12.10.
//
// This source code is licensed under the terms of the BSD license.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
// CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#import <Foundation/Foundation.h>
@interface NSString (Base64)
+ (NSString *) base64StringFromData: (NSData *)data;
- (NSString *)base64String;
@end
和NSString + Base64.m文件:
//
// NSString+Base64.m
// HudsonGrowl
//
// Created by Benjamin Broll on 06.12.10.
//
// This source code is licensed under the terms of the BSD license.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
// CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#import "NSString+Base64.h"
@implementation NSString (Base64)
+ (NSString *)encode:(const uint8_t *)input length:(NSInteger)length {
// this code seems to be floating on a lot of stackoverflow posts.
// i'm not aware of any license issues but let me know in case there are
// problems including the source in this project.
static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
NSMutableData *data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
uint8_t *output = (uint8_t *)data.mutableBytes;
for (NSInteger i = 0; i < length; i += 3) {
NSInteger value = 0;
for (NSInteger j = i; j < (i + 3); j++) {
value <<= 8;
if (j < length) {
value |= (0xFF & input[j]);
}
}
NSInteger index = (i / 3) * 4;
output[index + 0] = table[(value >> 18) & 0x3F];
output[index + 1] = table[(value >> 12) & 0x3F];
output[index + 2] = (i + 1) < length ? table[(value >> 6) & 0x3F] : '=';
output[index + 3] = (i + 2) < length ? table[(value >> 0) & 0x3F] : '=';
}
return [[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding] autorelease];
}
+ (NSString *) base64StringFromData: (NSData *)data {
return [self encode:data.bytes length:data.length];
}
- (NSString *)base64String {
NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
return [NSString base64StringFromData:data];
}
@end
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