驗證控制器問題

Question

的問題是：

Memory is never released; potential leak of memory pointed to by 'p' 

在代碼它發生在該單線方法的返回：

- (NSString *)encodeBase64:(const uint8_t *)input length:(NSInteger)length 
{ 
    return [NSString stringWithUTF8String:base64_encode(input, (size_t)length)]; 
} 

BASE64_ENCODE功能：

char* base64_encode(const void* buf, size_t size) 
{ 
    static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/"; 

    char* str = (char*) malloc((size+3)*4/3 + 1); 

    char* p = str; 
    unsigned char* q = (unsigned char*) buf; 
    size_t i = 0; 

    while(i < size) { 
     int c = q[i++]; 
     c *= 256; 
     if (i < size) c += q[i]; 
     i++; 

     c *= 256; 
     if (i < size) c += q[i]; 
     i++; 

     *p++ = base64[(c & 0x00fc0000) >> 18]; 
     *p++ = base64[(c & 0x0003f000) >> 12]; 

     if (i > size + 1) 
      *p++ = '='; 
     else 
      *p++ = base64[(c & 0x00000fc0) >> 6]; 

     if (i > size) 
      *p++ = '='; 
     else 
      *p++ = base64[c & 0x0000003f]; 
    } 

    *p = 0; 

    return str; 
} 

Answer 1

你應該free(str)後轉換char *到NSString：

- (NSString *)encodeBase64:(const uint8_t *)input length:(NSInteger)length 
{ 
    char *base64 = base64_encode(input, length); 
    NSString *ret = [NSString stringWithUTF8String:base64]; 
    free(base64); 
    return ret; 
} 

Answer 2

存儲器分配與malloc功能必須發佈與free，你必須改變噸他行

*p = 0; 

到

free(p);