181 lines
6.3 KiB
C
181 lines
6.3 KiB
C
#include "utils.h"
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// base64 转换表, 共64个
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static const char base64_alphabet[] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G',
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'H', 'I', 'J', 'K', 'L', 'M', 'N',
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'O', 'P', 'Q', 'R', 'S', 'T',
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'U', 'V', 'W', 'X', 'Y', 'Z',
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'a', 'b', 'c', 'd', 'e', 'f', 'g',
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'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't',
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'u', 'v', 'w', 'x', 'y', 'z',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'+', '/'};
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// 解码时使用
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static const unsigned char base64_suffix_map[256] = {
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 253, 255,
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255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 253, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
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255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255 };
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static char cmove_bits(unsigned char src, unsigned lnum, unsigned rnum) {
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src <<= lnum; // src = src << lnum;
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src >>= rnum; // src = src >> rnum;
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return src;
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}
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int base64_encode(const char *indata, int inlen, char *outdata) {
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int ret = 0; // return value
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if (indata == NULL || inlen == 0) {
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return ret = -1;
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}
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int in_len = 0; // 源字符串长度, 如果in_len不是3的倍数, 那么需要补成3的倍数
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int pad_num = 0; // 需要补齐的字符个数, 这样只有2, 1, 0(0的话不需要拼接, )
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if (inlen % 3 != 0) {
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pad_num = 3 - inlen % 3;
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}
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in_len = inlen + pad_num; // 拼接后的长度, 实际编码需要的长度(3的倍数)
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char *p = outdata; // 定义指针指向传出data的首地址
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//编码, 长度为调整后的长度, 3字节一组
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int i = 0;
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for (i = 0; i < in_len; i+=3) {
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int value = *indata >> 2; // 将indata第一个字符向右移动2bit(丢弃2bit)
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char c = base64_alphabet[value]; // 对应base64转换表的字符
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*p = c; // 将对应字符(编码后字符)赋值给outdata第一字节
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//处理最后一组(最后3字节)的数据
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if (i == inlen + pad_num - 3 && pad_num != 0) {
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if(pad_num == 1) {
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*(p + 1) = base64_alphabet[(int)(cmove_bits(*indata, 6, 2) + cmove_bits(*(indata + 1), 0, 4))];
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*(p + 2) = base64_alphabet[(int)cmove_bits(*(indata + 1), 4, 2)];
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*(p + 3) = '=';
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} else if (pad_num == 2) { // 编码后的数据要补两个 '='
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*(p + 1) = base64_alphabet[(int)cmove_bits(*indata, 6, 2)];
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*(p + 2) = '=';
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*(p + 3) = '=';
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}
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} else { // 处理正常的3字节的数据
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*(p + 1) = base64_alphabet[cmove_bits(*indata, 6, 2) + cmove_bits(*(indata + 1), 0, 4)];
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*(p + 2) = base64_alphabet[cmove_bits(*(indata + 1), 4, 2) + cmove_bits(*(indata + 2), 0, 6)];
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*(p + 3) = base64_alphabet[*(indata + 2) & 0x3f];
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}
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p += 4;
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indata += 3;
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}
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return ret;
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}
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int base64_decode(const char *indata, int inlen, char *outdata) {
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int ret = 0;
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if (indata == NULL || inlen <= 0 || outdata == NULL) {
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return ret = -1;
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}
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if (inlen % 4 != 0) { // 需要解码的数据不是4字节倍数
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return ret = -2;
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}
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int t = 0, x = 0, y = 0, i = 0;
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unsigned char c = 0;
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int g = 3;
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while (indata[x] != 0) {
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// 需要解码的数据对应的ASCII值对应base64_suffix_map的值
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c = base64_suffix_map[(unsigned int)indata[x++]];
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if (c == 255) return -1;// 对应的值不在转码表中
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if (c == 253) continue;// 对应的值是换行或者回车
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if (c == 254) { c = 0; g--; }// 对应的值是'='
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t = (t<<6) | c; // 将其依次放入一个int型中占3字节
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if (++y == 4) {
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outdata[i++] = (unsigned char)((t>>16)&0xff);
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if (g > 1) outdata[i++] = (unsigned char)((t>>8)&0xff);
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if (g > 2) outdata[i++] = (unsigned char)(t&0xff);
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y = t = 0;
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}
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}
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return ret;
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}
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int calc_file_len(const char *file_path)
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{
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FILE *fp;
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fp = fopen(file_path, "r");
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if(NULL == fp)
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{
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printf("cannot open file:%s\r\n",file_path);
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return 0;
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}
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//计算文件大小，申请内存
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fseek(fp,0L,SEEK_END);
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int file_len = ftell(fp);
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fclose(fp);
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return file_len;
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}
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static int _count_string(char *data, char *key)
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{
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int count = 0;
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int klen = strlen(key);
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char *pos_start = data, *pos_end;
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while (NULL != (pos_end = strstr(pos_start, key))) {
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pos_start = pos_end + klen;
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count++;
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}
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return count;
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}
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void replace_str(char *new_buf, char *data, char *rep, char *to)
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{
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int rep_len = strlen(rep);
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int to_len = strlen(to);
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int counts = _count_string(data, rep);
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if(0 == counts)
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{
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strcpy(new_buf, data);
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return;
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}
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char *pos_start = data, *pos_end, *pbuf = new_buf;
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int copy_len;
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while (NULL != (pos_end = strstr(pos_start, rep))) {
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copy_len = pos_end - pos_start;
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strncpy(pbuf, pos_start, copy_len);
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pbuf += copy_len;
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strcpy(pbuf, to);
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pbuf += to_len;
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pos_start = pos_end + rep_len;
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}
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strcpy(pbuf, pos_start);
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return;
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}
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