iphone-common-codes-ccteam源代码 CCNSData.m

//
//  CCNSData.m
//  CCFC
//
//  Created by xichen on 11-12-17.
//  Copyright 2011年 ccteam. All rights reserved.
//


#import "CCNSData.h"




@implementation NSData(cc)


// 将UTF8格式的数据进行URL编码,返回编码后的总字节
- (int)URLEncode:(char *)dest len:(const int)destLen
{ 
        int i; 
        int j = 0;
        char ch; 
    char *src = (char *)[self bytes];
        
        for (i = 0; (i < [self length]) && (j < destLen); i++) 
        { 
                ch = src[i]; 
                if ( ((ch >= 'A') && (ch <= 'Z')) 
                        || ((ch >= 'a') && (ch <= 'z'))
                        || ((ch >= '0') && (ch <= '9')))
                { 
                        dest[j++] = ch;                 // 普通ASCII字符
                }
                else if(' ' == ch)
                { 
                        dest[j++] = '+'; 
                } 
                else 
                { 
                        if (j + 3 < destLen)    // 是中文
                        { 
                                sprintf(dest + j, "%%%02X", (unsigned char)ch); 
                                j += 3; 
                        } 
                        else                                    // 出现保存空间不足的错误
                        { 
                                return 0; 
                        } 
                } 
        } 
        
        dest[j] = '\0';                                 // char*字符串结尾符
        return j; 
}


// 打印每个字符
- (void)print
{
        const unsigned char *bytes = (const unsigned char *)[self bytes];
        for(int i = 0; i < [self length]; ++i)
        {
                printf("%#X ", bytes[i]);
        }
}


// 已指定字符个数为单位打印数据
- (void)printWithUint:(NSDATA_UNIT)unit
{
        switch (unit)
        {
                case NSDATA_UNIT_ONE:
                {
                        [self print];
                }
                break;
                        
                case NSDATA_UNIT_TWO:
                {
                        const unsigned short *bytes = (const unsigned short *)[self bytes];
                        int unitCnt = [self length] / unit;
                        int last = [self length] - unitCnt * unit;
                        
                        for(int i = 0; i < unitCnt; ++i)
                                printf("%#X ", bytes[i]);
                        
                        if(last != 0)
                                printf("%#X ", *(const unsigned char *)(bytes + unitCnt));
                }
                break;
                        
                case NSDATA_UNIT_FOUR:
                {
                        const unsigned int *bytes = (const unsigned int *)[self bytes];
                        int unitCnt = [self length] / unit;
                        int last = [self length] - unitCnt * unit;
                        
                        for(int i = 0; i < unitCnt; ++i)
                                printf("%#X ", bytes[i]);
                        
                        for(int i = 0; i < last; ++i)
                                printf("%#X ", *(const unsigned char *)(bytes + unitCnt + i));
                }
                break;
                        
                default:
                        break;
        }
        
}


// returns the string that converts from the UTF8 encoding data
- (NSString *)UTF8Str
{
        return [[[NSString alloc] initWithData:self encoding:NSUTF8StringEncoding] autorelease];
}


@end

可能有更新:

googlecode链接地址：http://code.google.com/p/iphone-common-codes-ccteam/source/browse/trunk/CCFC/files/CCNSData.m

github地址: https://github.com/cxsjabc/iphone-common-codes-ccteam/tree/master/CCFC/files/CCNSData.m