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annotate src/libstrfunc.c @ 152:edebaf0e87d2

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more code cleanup
author Carl Byington <carl@five-ten-sg.com>
date Tue, 10 Mar 2009 13:09:20 -0700
parents cda7c812ec01
children 6954d315aaa8
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2 /* Taken from LibStrfunc v7.3 */
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4 #include "define.h"
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7 static char base64_code_chars[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/==";
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9 void base64_append(char **ou, int *line_count, char data)
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10 {
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11 if (*line_count == 76) {
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12 *(*ou)++ = '\n';
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13 *line_count = 0;
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14 }
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15 *(*ou)++ = data;
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16 (*line_count)++;
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17 }
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20 char *base64_encode(void *data, size_t size)
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21 {
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22 int line_count = 0;
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23 return base64_encode_multiple(data, size, &line_count);
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24 }
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27 char *base64_encode_multiple(void *data, size_t size, int *line_count)
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28 {
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29 char *output;
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30 char *ou;
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31 unsigned char *p = (unsigned char *)data;
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32 unsigned char *dte = p + size;
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34 if (data == NULL || size == 0) return NULL;
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36 ou = output = (char *)malloc(size / 3 * 4 + (size / 57) + 6);
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37 if (!output) return NULL;
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39 while((dte-p) >= 3) {
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40 unsigned char x = p[0];
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41 unsigned char y = p[1];
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42 unsigned char z = p[2];
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43 base64_append(&ou, line_count, base64_code_chars[ x >> 2 ]);
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44 base64_append(&ou, line_count, base64_code_chars[ ((x & 0x03) << 4) | (y >> 4) ]);
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45 base64_append(&ou, line_count, base64_code_chars[ ((y & 0x0F) << 2) | (z >> 6) ]);
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46 base64_append(&ou, line_count, base64_code_chars[ z & 0x3F ]);
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47 p+=3;
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48 };
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49 if ((dte-p) == 2) {
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50 base64_append(&ou, line_count, base64_code_chars[ *p >> 2 ]);
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51 base64_append(&ou, line_count, base64_code_chars[ ((*p & 0x03) << 4) | (p[1] >> 4) ]);
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52 base64_append(&ou, line_count, base64_code_chars[ ((p[1] & 0x0F) << 2) ]);
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53 base64_append(&ou, line_count, '=');
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54 } else if ((dte-p) == 1) {
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55 base64_append(&ou, line_count, base64_code_chars[ *p >> 2 ]);
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56 base64_append(&ou, line_count, base64_code_chars[ ((*p & 0x03) << 4) ]);
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57 base64_append(&ou, line_count, '=');
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58 base64_append(&ou, line_count, '=');
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59 };
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61 *ou=0;
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62 return output;
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63 };
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