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annotate src/libstrfunc.c @ 257:c947b8812120

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rfc2047 and rfc2231 encoding for non-ascii headers and attachment filenames
author Carl Byington <carl@five-ten-sg.com>
date Fri, 24 Dec 2010 19:26:05 -0800
parents 6954d315aaa8
children
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1
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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 static void base64_append(char **ou, int *line_count, char data);
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10 static void base64_append(char **ou, int *line_count, char data)
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11 {
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12 if (*line_count == 76) {
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13 *(*ou)++ = '\n';
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14 *line_count = 0;
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15 }
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16 *(*ou)++ = data;
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17 if (*line_count >= 0) (*line_count)++;
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18 }
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21 char *pst_base64_encode(void *data, size_t size)
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22 {
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23 int line_count = 0;
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24 return pst_base64_encode_multiple(data, size, &line_count);
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25 }
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28 char *pst_base64_encode_single(void *data, size_t size)
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29 {
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30 int line_count = -1;
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31 return pst_base64_encode_multiple(data, size, &line_count);
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32 }
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35 char *pst_base64_encode_multiple(void *data, size_t size, int *line_count)
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36 {
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37 char *output;
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38 char *ou;
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39 unsigned char *p = (unsigned char *)data;
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40 unsigned char *dte = p + size;
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42 if (data == NULL || size == 0) return NULL;
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44 ou = output = (char *)malloc(size / 3 * 4 + (size / 57) + 6);
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45 if (!output) return NULL;
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47 while((dte-p) >= 3) {
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48 unsigned char x = p[0];
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49 unsigned char y = p[1];
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50 unsigned char z = p[2];
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51 base64_append(&ou, line_count, base64_code_chars[ x >> 2 ]);
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52 base64_append(&ou, line_count, base64_code_chars[ ((x & 0x03) << 4) | (y >> 4) ]);
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53 base64_append(&ou, line_count, base64_code_chars[ ((y & 0x0F) << 2) | (z >> 6) ]);
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54 base64_append(&ou, line_count, base64_code_chars[ z & 0x3F ]);
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55 p+=3;
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56 };
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57 if ((dte-p) == 2) {
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58 base64_append(&ou, line_count, base64_code_chars[ *p >> 2 ]);
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59 base64_append(&ou, line_count, base64_code_chars[ ((*p & 0x03) << 4) | (p[1] >> 4) ]);
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60 base64_append(&ou, line_count, base64_code_chars[ ((p[1] & 0x0F) << 2) ]);
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61 base64_append(&ou, line_count, '=');
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62 } else if ((dte-p) == 1) {
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63 base64_append(&ou, line_count, base64_code_chars[ *p >> 2 ]);
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64 base64_append(&ou, line_count, base64_code_chars[ ((*p & 0x03) << 4) ]);
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65 base64_append(&ou, line_count, '=');
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66 base64_append(&ou, line_count, '=');
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67 };
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69 *ou=0;
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70 return output;
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71 };
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