diff options
Diffstat (limited to 'src/base64.c')
| -rw-r--r-- | src/base64.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/base64.c b/src/base64.c new file mode 100644 index 0000000..2bc0e1f --- /dev/null +++ b/src/base64.c @@ -0,0 +1,186 @@ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "base64.h" +/**************************************************************** +20060905 lqy +(1)mailsubject_base64_decode ��������������base64����,'='���ַ���ĩβ�� + ����Ĵ��� +***************************************************************** +20061130 LQY +mime_base64_decode ��������������base64����,'='���ַ���ĩβ�� + ����Ĵ��� + +****************************************************************/ +/* The following diagram shows the logical steps by which three octets + get transformed into eight Base64 characters. It helps understanding + shifts and masks in the transformation functions. + + .--------. .--------. .--------. + |aaaaaabb| |bbbbcccc| |ccdddddd| + `--------' `--------' `--------' + 6 2 4 4 2 6 + .--------+--------+--------+--------. + |00aaaaaa|00bbbbbb|00cccccc|00dddddd| + `--------+--------+--------+--------' + + .--------+--------+--------+--------. + |AAAAAAAA|BBBBBBBB|CCCCCCCC|DDDDDDDD| + `--------+--------+--------+--------' + + The octets are divided into 6 bit chunks, which are then encoded into + Base64 characters. */ + +/* Table of characters coding the 64 values. */ +char httpproxy_base64_value_to_char[64] = +{ + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', /* 0- 9 */ + 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', /* 10-19 */ + 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', /* 20-29 */ + 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 30-39 */ + 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', /* 40-49 */ + 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', /* 50-59 */ + '8', '9', '+', '/' /* 60-63 */ +}; + +/* Table of base64 values for first 128 characters. */ +#define z -1 +int httpproxy_base64_char_to_value[128] = +{ + z, z, z, z, z, z, z, z, z, z, /* 0- 9 */ + z, z, z, z, z, z, z, z, z, z, /* 10- 19 */ + z, z, z, z, z, z, z, z, z, z, /* 20- 29 */ + z, z, z, z, z, z, z, z, z, z, /* 30- 39 */ + z, z, z, 62, z, z, z, 63, 52, 53, /* 40- 49 */ + 54, 55, 56, 57, 58, 59, 60, 61, z, z, /* 50- 59 */ + z, z, z, z, z, 0, 1, 2, 3, 4, /* 60- 69 */ + 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 70- 79 */ + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, /* 80- 89 */ + 25, z, z, z, z, z, z, 26, 27, 28, /* 90- 99 */ + 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, /* 100-109 */ + 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, /* 110-119 */ + 49, 50, 51, z, z, z, z, z /* 120-127 */ +}; +#undef z + +int http_proxy_base64_decode(int flag_quote,char *src_buf,int srclen, char *dest) +{ + unsigned long value=0; + char *temp=NULL; + char *inputend=NULL; + int result=0; + char *dst_buf=NULL; + int dst_len=0; + + if(srclen==0) + { + return 0; + } + + + temp=src_buf; + inputend=src_buf+srclen; + dst_buf=dest; + + if(flag_quote==1) + { + + strcpy(dst_buf,"\""); + dst_len++; + } + else + { + strcpy(dst_buf,""); + } + while(temp<inputend) + { + if(*temp=='\n'||*temp=='\r') + { + temp=temp+1; + continue; + } + // process first byte of a quadruplet. + if(IS_BASE64(*temp)) + value=httpproxy_base64_char_to_value[(int)*temp]<<18; + else + value=0; + temp=temp+1; + //process second byte of a quadruplet. + if(temp==inputend) + { + result=-1; + goto dowith; + } + else + { + if(IS_BASE64(*temp)) + { + value|=httpproxy_base64_char_to_value[(int)*temp]<<12; + } + dst_buf[dst_len++]=(unsigned char)(value>>16); + dst_buf[dst_len]='\0'; + } + temp=temp+1; + // process third byte of a quadruple + if(temp==inputend) + { + result=-1; + goto dowith; + } + else + { + if(*temp=='=') + { + temp=temp+1; + //add by lqy 060905 + if(temp==inputend) + { + goto dowith; + } + temp=temp+1; + continue; + } + if(IS_BASE64(*temp)) + { + value|=httpproxy_base64_char_to_value[(int)*temp]<<6; + } + dst_buf[dst_len++]=(unsigned char)(MASK(8)&(value>>8)); + dst_buf[dst_len]='\0'; + } + temp=temp+1; + if(temp==inputend) + { + result=-1; + goto dowith; + } + else + { + if(*temp=='=') + { + temp=temp+1; + continue; + } + if(IS_BASE64(*temp)) + { + value|=httpproxy_base64_char_to_value[(int)*temp]; + } + dst_buf[dst_len++]=(unsigned char)(MASK(8)&value); + dst_buf[dst_len]='\0'; + } + temp=temp+1; + } + + if(flag_quote==1) + { + strcat(dst_buf," \""); + } + +dowith: + + return result; +} + + + + |