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我是用Google搜索這兩個我需要的C函數，而且我遇到的最乾淨的是http://fm4dd.com/programming/base64/base64_stringencode_c.htm但是它在我看來就像它的下面一小部分...endian-independent base64_encode/decode function
void decodeblock(unsigned char in[], char *clrstr) {
unsigned char out[4];
out[0] = in[0] << 2 | in[1] >> 4;
out[1] = in[1] << 4 | in[2] >> 2;
out[2] = in[2] << 6 | in[3] >> 0;
out[3] = '\0';
strncat(clrstr, out, sizeof(out));
}
...將會依賴於endian依賴（同上相應的encodeblack（），你可以在上面的url中看到）。但它不同於其他的一些：不同於其他一些：一個擁有三個自己的頭文件，另一個稱爲自己特殊的malloc（）函數等等。任何人都知道一個很好的，小的，乾淨的（沒有頭，沒有依賴關係等）版本，就像這個，那更獨立於架構？
編輯原因，我正在尋找這是BASE64_ENCODE（）將在PHP腳本這是一個HTML頁面的一部分，通過進行該編碼字符串的執行CGI程序在遙遠的框。然後，那cgi必須base64_decode（）它。所以架構獨立只是一個額外的安全性，以防cgi運行在非英特爾大端機箱上（英特爾很少）。
編輯按照下面的評論，在這裏與我進行了一些更改沿的完整代碼...
/* downloaded from...
http://fm4dd.com/programming/base64/base64_stringencode_c.htm */
/* ------------------------------------------------------------------------ *
* file: base64_stringencode.c v1.0 *
* purpose: tests encoding/decoding strings with base64 *
* author: 02/23/2009 Frank4DD *
* *
* source: http://base64.sourceforge.net/b64.c for encoding *
* http://en.literateprograms.org/Base64_(C) for decoding *
* ------------------------------------------------------------------------ */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* ---- Base64 Encoding/Decoding Table --- */
char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/";
/* decodeblock - decode 4 '6-bit' characters into 3 8-bit binary bytes */
void decodeblock(unsigned char in[], char *clrstr) {
unsigned char out[4];
out[0] = in[0] << 2 | in[1] >> 4;
out[1] = in[1] << 4 | in[2] >> 2;
out[2] = in[2] << 6 | in[3] >> 0;
out[3] = '\0';
strncat(clrstr, out, sizeof(out));
} /* --- end-of-function decodeblock() --- */
char *base64_decode(char *b64src /*, char *clrdst */) {
static char clrdstbuff[8192];
char *clrdst = clrdstbuff;
int c, phase, i;
unsigned char in[4];
char *p;
clrdst[0] = '\0';
phase = 0; i=0;
while(b64src[i]) {
c = (int) b64src[i];
if(c == '=') {
decodeblock(in, clrdst);
break; }
p = strchr(b64, c);
if(p) {
in[phase] = p - b64;
phase = (phase + 1) % 4;
if(phase == 0) {
decodeblock(in, clrdst);
in[0]=in[1]=in[2]=in[3]=0; }
} /* --- end-of-if(p) --- */
i++;
} /* --- end-of-while(b64src[i]) --- */
return (clrdstbuff);
} /* --- end-of-function base64_decode() --- */
/* encodeblock - encode 3 8-bit binary bytes as 4 '6-bit' characters */
void encodeblock(unsigned char in[], char b64str[], int len) {
unsigned char out[5];
out[0] = b64[ in[0] >> 2 ];
out[1] = b64[ ((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4) ];
out[2] = (unsigned char) (len > 1 ? b64[ ((in[1] & 0x0f) << 2) |
((in[2] & 0xc0) >> 6) ] : '=');
out[3] = (unsigned char) (len > 2 ? b64[ in[2] & 0x3f ] : '=');
out[4] = '\0';
strncat(b64str, out, sizeof(out));
} /* --- end-of-function encodeblock() --- */
/* encode - base64 encode a stream, adding padding if needed */
char *base64_encode(char *clrstr /*, char *b64dst */) {
static char b64dstbuff[8192];
char *b64dst = b64dstbuff;
unsigned char in[3];
int i, len = 0;
int j = 0;
b64dst[0] = '\0';
while(clrstr[j]) {
len = 0;
for(i=0; i<3; i++) {
in[i] = (unsigned char) clrstr[j];
if(clrstr[j]) {
len++; j++; }
else in[i] = 0;
} /* --- end-of-for(i) --- */
if(len) {
encodeblock(in, b64dst, len); }
} /* --- end-of-while(clrstr[j]) --- */
return (b64dstbuff);
} /* --- end-of-function base64_encode() --- */
#ifdef TESTBASE64
int main(int argc, char *argv[]) {
char *mysrc = (argc>1? argv[1] : "My bonnie is over the ocean ");
char *mysrc2 = (argc>2? argv[2] : "My bonnie is over the sea ");
char myb64[2048]="", myb642[2048]="";
char mydst[2048]="", mydst2[2048]="";
char *base64_enclode(), *base64_decode();
int testnum = 1;
if (strncmp(mysrc,"test",4) == 0)
testnum = atoi(mysrc+4);
if (testnum == 1) {
strcpy(myb64,base64_encode(mysrc));
printf("The string [%s]\n\tencodes into base64 as: [%s]\n",mysrc,myb64);
strcpy(myb642,base64_encode(mysrc2));
printf("The string [%s]\n\tencodes into base64 as: [%s]\n",mysrc2,myb642);
printf("...\n");
strcpy(mydst,base64_decode(myb64));
printf("The string [%s]\n\tdecodes from base64 as: [%s]\n",myb64,mydst);
strcpy(mydst2,base64_decode(myb642));
printf("The string [%s]\n\tdecodes from base64 as: [%s]\n",myb642,mydst2);
} /* --- end-of-if(testnum==1) --- */
if (testnum == 2) {
strcpy(mydst,base64_decode(mysrc2)); /* input is b64 */
printf("The string [%s]\n\tdecodes from base64 as: [%s]\n",mysrc2,mydst);
} /* --- end-of-if(testnum==2) --- */
if (testnum == 3) {
int itest, ntests = (argc>2?atoi(argv[2]):999);
int ichar, nchars = (argc>3?atoi(argv[3]):128);
unsigned int seed = (argc>4?atoi(argv[4]):987654321);
char blanks[999] = " ";
srand(seed);
for (itest=1; itest<=ntests; itest++) {
for (ichar=0; ichar<nchars; ichar++) mydst[ichar] = 1+(rand()%255);
mydst[nchars] = '\000';
if (strlen(blanks) > 0) strcat(mydst,blanks);
strcpy(myb64,base64_encode(mydst));
strcpy(mydst2,base64_decode(myb64));
if (strcmp(mydst,mydst2) != 0)
printf("Test#%d:\n\t in=%s\n\tout=%s\n",itest,mydst,mydst2);
} /* --- end-of-for(itest) --- */
} /* --- end-of-if(testnum==3) --- */
return 0;
} /* --- end-of-function main() --- */
#endif
但是，排序*很重要。在做其他事情之前，你可以在編碼中加入htonl/s，在解碼中加入ntohl/s。然後你知道你總是有相同的字節順序。 –
你能否詳細說明你的懷孕依賴懷疑？也許舉一個例子，你在兩個endianesses計算得到錯誤/不同的結果？ – Yunnosch
@Yunnosch我沒有得到不同的結果 - 請參閱上面的編輯（但等待一分鐘，直到我把它放在那裏） –