/* * Copyright (c) 2003-2010 by FlashCode * See README for License detail, AUTHORS for developers list. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ /* wee-string.c: string functions for WeeChat */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include #if defined(__OpenBSD__) #include #else #include #endif #ifdef HAVE_ICONV #include #endif #ifndef ICONV_CONST #ifdef ICONV_2ARG_IS_CONST #define ICONV_CONST const #else #define ICONV_CONST #endif #endif #include "weechat.h" #include "wee-string.h" #include "wee-utf8.h" #include "../gui/gui-color.h" /* * string_strndup: define strndup function for systems where this function does * not exist (FreeBSD and maybe other) */ char * string_strndup (const char *string, int length) { char *result; if ((int)strlen (string) < length) return strdup (string); result = malloc (length + 1); if (!result) return NULL; memcpy (result, string, length); result[length] = '\0'; return result; } /* * string_tolower: locale independant string conversion to lower case */ void string_tolower (char *string) { while (string && string[0]) { if ((string[0] >= 'A') && (string[0] <= 'Z')) string[0] += ('a' - 'A'); string = utf8_next_char (string); } } /* * string_toupper: locale independant string conversion to upper case */ void string_toupper (char *string) { while (string && string[0]) { if ((string[0] >= 'a') && (string[0] <= 'z')) string[0] -= ('a' - 'A'); string = utf8_next_char (string); } } /* * string_strcasecmp: locale and case independent string comparison */ int string_strcasecmp (const char *string1, const char *string2) { int diff; if (!string1 || !string2) return (string1) ? 1 : ((string2) ? -1 : 0); while (string1[0] && string2[0]) { diff = utf8_charcasecmp (string1, string2); if (diff != 0) return diff; string1 = utf8_next_char (string1); string2 = utf8_next_char (string2); } return (string1[0]) ? 1 : ((string2[0]) ? -1 : 0); } /* * string_strncasecmp: locale and case independent string comparison * with max length */ int string_strncasecmp (const char *string1, const char *string2, int max) { int count, diff; if (!string1 || !string2) return (string1) ? 1 : ((string2) ? -1 : 0); count = 0; while ((count < max) && string1[0] && string2[0]) { diff = utf8_charcasecmp (string1, string2); if (diff != 0) return diff; string1 = utf8_next_char (string1); string2 = utf8_next_char (string2); count++; } if (count >= max) return 0; else return (string1[0]) ? 1 : ((string2[0]) ? -1 : 0); } /* * string_strcmp_ignore_chars: compare 2 strings, ignoring ignore some chars */ int string_strcmp_ignore_chars (const char *string1, const char *string2, const char *chars_ignored, int case_sensitive) { int diff; if (!string1 && !string2) return 0; if (!string1 && string2) return -1; if (string1 && !string2) return 1; while (string1 && string1[0] && string2 && string2[0]) { /* skip ignored chars */ while (string1 && string1[0] && strchr (chars_ignored, string1[0])) { string1 = utf8_next_char (string1); } while (string2 && string2[0] && strchr (chars_ignored, string2[0])) { string2 = utf8_next_char (string2); } /* end of one (or both) string(s) ? */ if ((!string1 || !string1[0]) && (!string2 || !string2[0])) return 0; if ((!string1 || !string1[0]) && string2 && string2[0]) return -1; if (string1 && string1[0] && (!string2 || !string2[0])) return 1; /* look at diff */ diff = (case_sensitive) ? (int)string1[0] - (int)string2[0] : utf8_charcasecmp (string1, string2); if (diff != 0) return diff; string1 = utf8_next_char (string1); string2 = utf8_next_char (string2); /* skip ignored chars */ while (string1 && string1[0] && strchr (chars_ignored, string1[0])) { string1 = utf8_next_char (string1); } while (string2 && string2[0] && strchr (chars_ignored, string2[0])) { string2 = utf8_next_char (string2); } } if ((!string1 || !string1[0]) && string2 && string2[0]) return -1; if (string1 && string1[0] && (!string2 || !string2[0])) return 1; return 0; } /* * string_strcasestr: locale and case independent string search */ char * string_strcasestr (const char *string, const char *search) { int length_search; length_search = utf8_strlen (search); if (!string || !search || (length_search == 0)) return NULL; while (string[0]) { if (string_strncasecmp (string, search, length_search) == 0) return (char *)string; string = utf8_next_char (string); } return NULL; } /* * string_match: return 1 if string matches a mask * mask can begin or end with "*", no other "*" are allowed * inside mask */ int string_match (const char *string, const char *mask, int case_sensitive) { char last, *mask2; int len_string, len_mask, rc; if (!mask || !mask[0]) return 0; /* if mask is "*", then any string matches */ if (strcmp (mask, "*") == 0) return 1; len_string = strlen (string); len_mask = strlen (mask); last = mask[len_mask - 1]; /* mask begins with "*" */ if ((mask[0] == '*') && (last != '*')) { /* not enough chars in string to match */ if (len_string < len_mask - 1) return 0; /* check if end of string matches */ if ((case_sensitive && (strcmp (string + len_string - (len_mask - 1), mask + 1) == 0)) || (!case_sensitive && (string_strcasecmp (string + len_string - (len_mask - 1), mask + 1) == 0))) return 1; /* no match */ return 0; } /* mask ends with "*" */ if ((mask[0] != '*') && (last == '*')) { /* not enough chars in string to match */ if (len_string < len_mask - 1) return 0; /* check if beginning of string matches */ if ((case_sensitive && (strncmp (string, mask, len_mask - 1) == 0)) || (!case_sensitive && (string_strncasecmp (string, mask, len_mask - 1) == 0))) return 1; /* no match */ return 0; } /* mask begins and ends with "*" */ if ((mask[0] == '*') && (last == '*')) { /* not enough chars in string to match */ if (len_string < len_mask - 1) return 0; /* keep only relevant chars in mask for searching string */ mask2 = string_strndup (mask + 1, len_mask - 2); if (!mask2) return 0; /* search string */ rc = ((case_sensitive && strstr (string, mask2)) || (!case_sensitive && string_strcasestr (string, mask2))) ? 1 : 0; /* free and return */ free (mask2); return rc; } /* no "*" at all, compare strings */ if ((case_sensitive && (strcmp (string, mask) == 0)) || (!case_sensitive && (string_strcasecmp (string, mask) == 0))) return 1; /* no match */ return 0; } /* * string_replace: replace a string by new one in a string * note: returned value has to be free() after use */ char * string_replace (const char *string, const char *search, const char *replace) { const char *pos; char *new_string; int length1, length2, length_new, count; if (!string || !search || !replace) return NULL; length1 = strlen (search); length2 = strlen (replace); /* count number of strings to replace */ count = 0; pos = string; while (pos && pos[0] && (pos = strstr (pos, search))) { count++; pos += length1; } /* easy: no string to replace! */ if (count == 0) return strdup (string); /* compute needed memory for new string */ length_new = strlen (string) - (count * length1) + (count * length2) + 1; /* allocate new string */ new_string = malloc (length_new); if (!new_string) return strdup (string); /* replace all occurences */ new_string[0] = '\0'; while (string && string[0]) { pos = strstr (string, search); if (pos) { strncat (new_string, string, pos - string); strcat (new_string, replace); pos += length1; } else strcat (new_string, string); string = pos; } return new_string; } /* * string_remove_quotes: remove quotes at beginning/end of string * (ignore spaces if there are before first quote or * after last quote) * note: returned value has to be free() after use */ char * string_remove_quotes (const char *string, const char *quotes) { int length; const char *pos_start, *pos_end; if (!string || !quotes) return NULL; if (!string[0]) return strdup (string); pos_start = string; while (pos_start[0] == ' ') { pos_start++; } length = strlen (string); pos_end = string + length - 1; while ((pos_end[0] == ' ') && (pos_end > pos_start)) { pos_end--; } if (!pos_start[0] || !pos_end[0] || (pos_end <= pos_start)) return strdup (string); if (strchr (quotes, pos_start[0]) && (pos_end[0] == pos_start[0])) { if (pos_end == (pos_start + 1)) return strdup (""); return string_strndup (pos_start + 1, pos_end - pos_start - 1); } return strdup (string); } /* * string_strip: strip chars at beginning and/or end of string * note: returned value has to be free() after use */ char * string_strip (const char *string, int left, int right, const char *chars) { const char *ptr_start, *ptr_end; if (!string) return NULL; if (!string[0]) return strdup (string); ptr_start = string; ptr_end = string + strlen (string) - 1; if (left) { while (ptr_start[0] && strchr (chars, ptr_start[0])) { ptr_start++; } if (!ptr_start[0]) return strdup (ptr_start); } if (right) { while ((ptr_end >= ptr_start) && strchr (chars, ptr_end[0])) { ptr_end--; } if (ptr_end < ptr_start) return strdup (""); } return string_strndup (ptr_start, ptr_end - ptr_start + 1); } /* * string_convert_hex_chars: convert hex chars (\x??) to value * note: returned value has to be free() after use */ char * string_convert_hex_chars (const char *string) { char *output, hex_str[8], *error; int pos_output; long number; output = malloc (strlen (string) + 1); if (output) { pos_output = 0; while (string && string[0]) { if (string[0] == '\\') { string++; switch (string[0]) { case '\\': output[pos_output++] = '\\'; string++; break; case 'x': case 'X': if (isxdigit (string[1]) && isxdigit (string[2])) { snprintf (hex_str, sizeof (hex_str), "0x%c%c", string[1], string[2]); number = strtol (hex_str, &error, 16); if (error && !error[0]) { output[pos_output++] = number; string += 3; } else { output[pos_output++] = '\\'; output[pos_output++] = string[0]; string++; } } else { output[pos_output++] = string[0]; string++; } break; default: output[pos_output++] = '\\'; output[pos_output++] = string[0]; string++; break; } } else { output[pos_output++] = string[0]; string++; } } output[pos_output] = '\0'; } return output; } /* * string_is_word_char: return 1 if given character is a "word character" */ int string_is_word_char (const char *string) { wint_t c = utf8_wide_char (string); if (c == WEOF) return 0; if (iswalnum (c)) return 1; switch (c) { case '-': case '_': case '|': return 1; } /* not a 'word char' */ return 0; } /* * string_has_highlight: return 1 if string contains a highlight (using list of * words to highlight) * return 0 if no highlight is found in string */ int string_has_highlight (const char *string, const char *highlight_words) { char *msg, *highlight, *match, *match_pre, *match_post, *msg_pos, *pos, *pos_end; int end, length, startswith, endswith, wildcard_start, wildcard_end; if (!string || !string[0] || !highlight_words || !highlight_words[0]) return 0; /* convert both strings to lower case */ msg = strdup (string); if (!msg) return 0; string_tolower (msg); highlight = strdup (highlight_words); if (!highlight) { free (msg); return 0; } string_tolower (highlight); pos = highlight; end = 0; while (!end) { pos_end = strchr (pos, ','); if (!pos_end) { pos_end = strchr (pos, '\0'); end = 1; } /* error parsing string! */ if (!pos_end) { free (msg); free (highlight); return 0; } length = pos_end - pos; pos_end[0] = '\0'; if (length > 0) { if ((wildcard_start = (pos[0] == '*'))) { pos++; length--; } if ((wildcard_end = (*(pos_end - 1) == '*'))) { *(pos_end - 1) = '\0'; length--; } } if (length > 0) { msg_pos = msg; /* highlight found! */ while ((match = strstr (msg_pos, pos)) != NULL) { match_pre = match - 1; match_pre = utf8_prev_char (msg, match); if (!match_pre) match_pre = match - 1; match_post = match + length; startswith = ((match == msg) || (!string_is_word_char (match_pre))); endswith = ((!match_post[0]) || (!string_is_word_char (match_post))); if ((wildcard_start && wildcard_end) || (!wildcard_start && !wildcard_end && startswith && endswith) || (wildcard_start && endswith) || (wildcard_end && startswith)) { free (msg); free (highlight); return 1; } msg_pos = match_post; } } if (!end) pos = pos_end + 1; } free (msg); free (highlight); /* no highlight found */ return 0; } /* * string_mask_to_regex: convert a mask (string with only "*" as joker) to a * regex, paying attention to special chars in a regex */ char * string_mask_to_regex (const char *mask) { char *result; const char *ptr_mask; int index_result; char *regex_special_char = ".[]{}()?+"; if (!mask) return NULL; result = malloc ((strlen (mask) * 2) + 1); if (!result) return NULL; result[0] = '\0'; index_result = 0; ptr_mask = mask; while (ptr_mask[0]) { /* '*' in string ? then replace by '.*' */ if (ptr_mask[0] == '*') { result[index_result++] = '.'; result[index_result++] = '*'; } /* special regex char in string ? escape it with '\' */ else if (strchr (regex_special_char, ptr_mask[0])) { result[index_result++] = '\\'; result[index_result++] = ptr_mask[0]; } /* standard char, just copy it */ else result[index_result++] = ptr_mask[0]; ptr_mask++; } /* add final '\0' */ result[index_result] = '\0'; return result; } /* * string_split: split a string according to separators * examples: * string_split ("abc de fghi", " ", 0, 0, NULL) * ==> array[0] = "abc" * array[1] = "de" * array[2] = "fghi" * array[3] = NULL * string_split ("abc de fghi", " ", 1, 0, NULL) * ==> array[0] = "abc de fghi" * array[1] = "de fghi" * array[2] = "fghi" * array[3] = NULL */ char ** string_split (const char *string, const char *separators, int keep_eol, int num_items_max, int *num_items) { int i, j, n_items; char *string2, **array; char *ptr, *ptr1, *ptr2; if (num_items != NULL) *num_items = 0; if (!string || !string[0] || !separators || !separators[0]) return NULL; string2 = string_strip (string, 1, 1, separators); if (!string2 || !string2[0]) return NULL; /* calculate number of items */ ptr = string2; i = 1; while ((ptr = strpbrk (ptr, separators))) { while (ptr[0] && (strchr (separators, ptr[0]) != NULL)) { ptr++; } i++; } n_items = i; if ((num_items_max != 0) && (n_items > num_items_max)) n_items = num_items_max; array = malloc ((n_items + 1) * sizeof (array[0])); if (!array) return NULL; ptr1 = string2; ptr2 = string2; for (i = 0; i < n_items; i++) { while (ptr1[0] && (strchr (separators, ptr1[0]) != NULL)) { ptr1++; } if (i == (n_items - 1)) { ptr2 = strpbrk (ptr1, separators); if (!ptr2) ptr2 = strchr (ptr1, '\0'); } else { if ((ptr2 = strpbrk (ptr1, separators)) == NULL) { if ((ptr2 = strchr (ptr1, '\r')) == NULL) { if ((ptr2 = strchr (ptr1, '\n')) == NULL) { ptr2 = strchr (ptr1, '\0'); } } } } if ((ptr1 == NULL) || (ptr2 == NULL)) { array[i] = NULL; } else { if (ptr2 - ptr1 > 0) { if (keep_eol) { array[i] = strdup (ptr1); if (!array[i]) { for (j = 0; j < n_items; j++) { if (array[j]) free (array[j]); } free (array); free (string2); return NULL; } } else { array[i] = malloc (ptr2 - ptr1 + 1); if (!array[i]) { for (j = 0; j < n_items; j++) { if (array[j]) free (array[j]); } free (array); free (string2); return NULL; } strncpy (array[i], ptr1, ptr2 - ptr1); array[i][ptr2 - ptr1] = '\0'; } ptr1 = ++ptr2; } else { array[i] = NULL; } } } array[i] = NULL; if (num_items != NULL) *num_items = i; free (string2); return array; } /* * string_free_split: free a split string */ void string_free_split (char **split_string) { int i; if (split_string) { for (i = 0; split_string[i]; i++) free (split_string[i]); free (split_string); } } /* * string_build_with_split_string: build a string with a split string * note: returned value has to be free() after * use */ char * string_build_with_split_string (const char **split_string, const char *separator) { int i, length, length_separator; char *result; if (!split_string) return NULL; length = 0; length_separator = (separator) ? strlen (separator) : 0; for (i = 0; split_string[i]; i++) { length += strlen (split_string[i]) + length_separator; } result = malloc (length + 1); if (result) { result[0] = '\0'; for (i = 0; split_string[i]; i++) { strcat (result, split_string[i]); if (separator && split_string[i + 1]) strcat (result, separator); } } return result; } /* * string_split_command: split a list of commands separated by 'separator' * and ecscaped with '\' * - empty commands are removed * - spaces on the left of each commands are stripped * Result must be freed with free_multi_command */ char ** string_split_command (const char *command, char separator) { int nb_substr, arr_idx, str_idx, type; char **array; char *buffer, *p; const char *ptr; if (!command || !command[0]) return NULL; nb_substr = 1; ptr = command; while ( (p = strchr(ptr, separator)) != NULL) { nb_substr++; ptr = ++p; } array = malloc ((nb_substr + 1) * sizeof (array[0])); if (!array) return NULL; buffer = malloc (strlen(command) + 1); if (!buffer) { free (array); return NULL; } ptr = command; str_idx = 0; arr_idx = 0; while(*ptr != '\0') { type = 0; if (*ptr == ';') { if (ptr == command) type = 1; else if ( *(ptr-1) != '\\') type = 1; else if ( *(ptr-1) == '\\') type = 2; } if (type == 1) { buffer[str_idx] = '\0'; str_idx = -1; p = buffer; /* strip white spaces a the begining of the line */ while (*p == ' ') p++; if (p && p[0]) array[arr_idx++] = strdup (p); } else if (type == 2) buffer[--str_idx] = *ptr; else buffer[str_idx] = *ptr; str_idx++; ptr++; } buffer[str_idx] = '\0'; p = buffer; while (*p == ' ') p++; if (p && p[0]) array[arr_idx++] = strdup (p); array[arr_idx] = NULL; free (buffer); array = realloc (array, (arr_idx + 1) * sizeof(array[0])); return array; } /* * string_free_split_command : free a list of commands split * with string_split_command */ void string_free_split_command (char **split_command) { int i; if (split_command) { for (i = 0; split_command[i]; i++) free (split_command[i]); free (split_command); } } /* * string_iconv: convert string to another charset * note: returned value has to be free() after use */ char * string_iconv (int from_utf8, const char *from_code, const char *to_code, const char *string) { char *outbuf; #ifdef HAVE_ICONV iconv_t cd; char *inbuf, *ptr_inbuf, *ptr_outbuf, *next_char; char *ptr_inbuf_shift; int done; size_t err, inbytesleft, outbytesleft; if (from_code && from_code[0] && to_code && to_code[0] && (string_strcasecmp(from_code, to_code) != 0)) { cd = iconv_open (to_code, from_code); if (cd == (iconv_t)(-1)) outbuf = strdup (string); else { inbuf = strdup (string); if (!inbuf) return NULL; ptr_inbuf = inbuf; inbytesleft = strlen (inbuf); outbytesleft = inbytesleft * 4; outbuf = malloc (outbytesleft + 2); if (!outbuf) return inbuf; ptr_outbuf = outbuf; ptr_inbuf_shift = NULL; done = 0; while (!done) { err = iconv (cd, (ICONV_CONST char **)(&ptr_inbuf), &inbytesleft, &ptr_outbuf, &outbytesleft); if (err == (size_t)(-1)) { switch (errno) { case EINVAL: done = 1; break; case E2BIG: done = 1; break; case EILSEQ: if (from_utf8) { next_char = utf8_next_char (ptr_inbuf); if (next_char) { inbytesleft -= next_char - ptr_inbuf; ptr_inbuf = next_char; } else { inbytesleft--; ptr_inbuf++; } } else { ptr_inbuf++; inbytesleft--; } ptr_outbuf[0] = '?'; ptr_outbuf++; outbytesleft--; break; } } else { if (!ptr_inbuf_shift) { ptr_inbuf_shift = ptr_inbuf; ptr_inbuf = NULL; inbytesleft = 0; } else done = 1; } } if (ptr_inbuf_shift) ptr_inbuf = ptr_inbuf_shift; ptr_outbuf[0] = '\0'; free (inbuf); iconv_close (cd); } } else outbuf = strdup (string); #else /* make C compiler happy */ (void) from_utf8; (void) from_code; (void) to_code; outbuf = strdup (string); #endif /* HAVE_ICONV */ return outbuf; } /* * string_iconv_to_internal: convert user string (input, script, ..) to * WeeChat internal storage charset * note: returned value has to be free() after use */ char * string_iconv_to_internal (const char *charset, const char *string) { char *input, *output; if (!string) return NULL; input = strdup (string); if (!input) return NULL; /* optimize for UTF-8: if charset is NULL => we use term charset => if ths charset is already UTF-8, then no iconv needed */ if (local_utf8 && (!charset || !charset[0])) return input; if (utf8_has_8bits (input) && utf8_is_valid (input, NULL)) return input; output = string_iconv (0, (charset && charset[0]) ? charset : weechat_local_charset, WEECHAT_INTERNAL_CHARSET, input); if (!output) return input; utf8_normalize (output, '?'); free (input); return output; } /* * string_iconv_from_internal: convert internal string to terminal charset, * for display * note: returned value has to be free() after use */ char * string_iconv_from_internal (const char *charset, const char *string) { char *input, *output; if (!string) return NULL; input = strdup (string); if (!input) return NULL; /* optimize for UTF-8: if charset is NULL => we use term charset => if ths charset is already UTF-8, then no iconv needed */ if (local_utf8 && (!charset || !charset[0])) return input; utf8_normalize (input, '?'); output = string_iconv (1, WEECHAT_INTERNAL_CHARSET, (charset && charset[0]) ? charset : weechat_local_charset, input); if (!output) return input; free (input); return output; } /* * string_iconv_fprintf: encode to terminal charset, then call fprintf on a file */ void string_iconv_fprintf (FILE *file, const char *data, ...) { va_list argptr; char *buf, *buf2; buf = malloc (128 * 1024); if (!buf) return; va_start (argptr, data); vsnprintf (buf, 128 * 1024, data, argptr); va_end (argptr); buf2 = string_iconv_from_internal (NULL, buf); fprintf (file, "%s", (buf2) ? buf2 : buf); free (buf); if (buf2) free (buf2); } /* * string_format_size: format a string with size and unit name (bytes, KB, MB, GB) * note: returned value has to be free() after use */ char * string_format_size (unsigned long size) { char *unit_name[] = { N_("bytes"), N_("KB"), N_("MB"), N_("GB") }; char *unit_format[] = { "%.0f", "%.1f", "%.02f", "%.02f" }; float unit_divide[] = { 1, 1024, 1024*1024, 1024*1024*1024 }; char format_size[128], str_size[128]; int num_unit; str_size[0] = '\0'; if (size < 1024*10) num_unit = 0; else if (size < 1024*1024) num_unit = 1; else if (size < 1024*1024*1024) num_unit = 2; else num_unit = 3; snprintf (format_size, sizeof (format_size), "%s %%s", unit_format[num_unit]); snprintf (str_size, sizeof (str_size), format_size, ((float)size) / ((float)(unit_divide[num_unit])), (size <= 1) ? _("byte") : _(unit_name[num_unit])); return strdup (str_size); } /* * string_convbase64_8x3_to_6x4 : convert 3 bytes of 8 bits in 4 bytes of 6 bits */ void string_convbase64_8x3_to_6x4 (const char *from, char *to) { unsigned char base64_table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz0123456789+/"; to[0] = base64_table [ (from[0] & 0xfc) >> 2 ]; to[1] = base64_table [ ((from[0] & 0x03) << 4) + ((from[1] & 0xf0) >> 4) ]; to[2] = base64_table [ ((from[1] & 0x0f) << 2) + ((from[2] & 0xc0) >> 6) ]; to[3] = base64_table [ from[2] & 0x3f ]; } /* * string_encode_base64: encode a string in base64 * length is number of bytes in "from" to convert * (commonly strlen(from)) */ void string_encode_base64 (const char *from, int length, char *to) { const char *ptr_from; char *ptr_to; ptr_from = from; ptr_to = to; while (length >= 3) { string_convbase64_8x3_to_6x4 (ptr_from, ptr_to); ptr_from += 3 * sizeof (*ptr_from); ptr_to += 4 * sizeof (*ptr_to); length -= 3; } if (length > 0) { char rest[3] = { 0, 0, 0 }; switch (length) { case 1 : rest[0] = ptr_from[0]; string_convbase64_8x3_to_6x4 (rest, ptr_to); ptr_to[2] = ptr_to[3] = '='; break; case 2 : rest[0] = ptr_from[0]; rest[1] = ptr_from[1]; string_convbase64_8x3_to_6x4 (rest, ptr_to); ptr_to[3] = '='; break; } ptr_to[4] = 0; } else ptr_to[0] = '\0'; } /* * string_convbase64_6x4_to_8x3 : convert 4 bytes of 6 bits to 3 bytes of 8 bits */ void string_convbase64_6x4_to_8x3 (const unsigned char *from, unsigned char *to) { to[0] = from[0] << 2 | from[1] >> 4; to[1] = from[1] << 4 | from[2] >> 2; to[2] = ((from[2] << 6) & 0xc0) | from[3]; } /* * string_decode_base64: decode a base64 string * return length of string in *to * (does not count final \0) */ int string_decode_base64 (const char *from, char *to) { const char *ptr_from; int length, to_length, i; char *ptr_to; unsigned char c, in[4], out[3]; unsigned char base64_table[]="|$$$}rstuvwxyz{$$$$$$$>?" "@ABCDEFGHIJKLMNOPQRSTUVW$$$$$$XYZ[\\]^_`abcdefghijklmnopq"; ptr_from = from; ptr_to = to; ptr_to[0] = '\0'; to_length = 0; while (ptr_from && ptr_from[0]) { length = 0; for (i = 0; i < 4; i++) { c = 0; while (ptr_from[0] && (c == 0)) { c = (unsigned char) ptr_from[0]; ptr_from++; c = ((c < 43) || (c > 122)) ? 0 : base64_table[c - 43]; if (c) c = (c == '$') ? 0 : c - 61; } if (ptr_from[0]) { length++; if (c) in[i] = c - 1; } else { in[i] = '\0'; break; } } if (length) { string_convbase64_6x4_to_8x3 (in, out); for (i = 0; i < length - 1; i++) { ptr_to[0] = out[i]; ptr_to++; to_length++; } } } ptr_to[0] = '\0'; return to_length; }