c语言解析url编码,url编码与解码（C语言）
#define _CRT_SECURE_NO_WARNINGS
#include
#include
#include
#include
typedef enum _BOOL_
{
FALSE = 0,
TRUE
} BOOL;
#ifdef GCC_GUN_C
#define HEX_TO_DEC(ch)
({
char ret = -1;
if (ch >= '0' && ch <= '9') ret = ch - '0';
else if (ch >= 'a' && ch <= 'z') ret = ch - 'a' + 10;
else if (ch >= 'A' && ch <= 'Z') ret = ch - 'A' + 10;
else ret = -1;
ret;
})
#else
int hex2dec(const char ch)
{
if (ch >= '0' && ch <= '9') return ch - '0';
if (ch >= 'a' && ch <= 'z') return ch - 'a' + 10;
if (ch >= 'A' && ch <= 'Z') return ch - 'A' + 10;
return -1;
}
#endif
BOOL urlencode(char* *lpszDest, const char* cszSrc, size_t nLen);
BOOL urldecode(char* *lpszDest, const char* pszUrl, size_t nLen);
int main()
{
char str[] = "http://www.baidu.com/s?ie=utf-8&f=8&tn=baidu&wd=临时邮箱";
char *pUrl = NULL;
char* pSrc = NULL;
printf("编码前：%s
", str);
urlencode(&pUrl, str, strlen(str)); // 编码
printf("编码后：%s
", pUrl);
urldecode(&pSrc, pUrl, strlen(pUrl)); // 解码
printf("解码后：%s
", pSrc);
if (pUrl)
free(pUrl); // 释放内存
if (pSrc)
free(pSrc); // 释放内存
_getch();
return 0;
}
// GB2312编码转url编码
BOOL urlencode(char* *lpszDest, const char* cszSrc, size_t nLen)
{
size_t i = 0, nIndex = 0;
size_t len = nLen;
char hex[] = "0123456789ABCDEF";
char ch;
char* pNew = NULL;
if (!cszSrc)
return FALSE;
*lpszDest = (char *)malloc(nLen * sizeof(char) + 1); // 增加一个长度存储' '
if (NULL == *lpszDest)
return FALSE;
for (i = 0; i < nLen; i++) {
ch = cszSrc[i];
if ((ch >= '0' && ch <= '9') ||
(ch >= 'a' && ch <= 'z') ||
(ch >= 'A' && ch <= 'Z') ||
ch == '-' || ch == '_' || ch == '.' || ch == '~') {
(*lpszDest)[nIndex++] = ch;
}
else if (ch == ' ') {
(*lpszDest)[nIndex++] = '+';
}
else {
int tmp = ch;
if (ch < 0)
tmp += 256;
(*lpszDest)[nIndex++] = '%';
(*lpszDest)[nIndex++] = hex[tmp / 16];
(*lpszDest)[nIndex++] = hex[tmp % 16];
}
if (nIndex >= len - 1) {
len *= 3;
pNew = malloc(sizeof(char) * len);
memset(pNew, ' ', sizeof(char) * len);
if (!pNew)
return FALSE;
memcpy(pNew, *lpszDest, nIndex);
free(*lpszDest);
*lpszDest = pNew;
}
}
*lpszDest = (char *)realloc(pNew, sizeof(char) * strlen(pNew) + 1); // 输出参数
if (!*lpszDest)
{
free(*lpszDest);
return FALSE;
}
return TRUE;
}
// url解码函数
BOOL urldecode(char* *lpszDest, const char* pszUrl, size_t nLen)
{
size_t i = 0, nIndex = 0;
char ch;
char* pNew = NULL;
*lpszDest = (char *)malloc(nLen * sizeof(char));
if (NULL == *lpszDest)
return FALSE;
memset(*lpszDest, ' ', nLen);
for (i = 0; i < nLen; ++i) {
ch = pszUrl[i];
if (ch != '%') {
(*lpszDest)[nIndex++] = ch;
}
else {
char h = pszUrl[++i];
char l = pszUrl[++i];
#ifdef GCC_GUN_C
int num = (HEX_TO_DEC(h) << 4) | HEX_TO_DEC(l);
#else
int num = (hex2dec(h) << 4) | hex2dec(l);
#endif
(*lpszDest)[nIndex++] = num;
}
}
pNew = (char*)malloc(sizeof(char) * strlen(*lpszDest) + 1);
if (!pNew)
return FALSE;
strncpy(pNew, *lpszDest, strlen(*lpszDest) + 1); // +1拷贝' '
free(*lpszDest);
*lpszDest = pNew;
return TRUE;
}