mirror of
https://github.com/mpv-player/mpv
synced 2024-12-22 23:02:37 +00:00
470 lines
12 KiB
C
470 lines
12 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <strings.h>
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#include <assert.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "mpv_talloc.h"
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#include "common/common.h"
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#include "misc/ctype.h"
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#include "bstr.h"
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int bstrcmp(struct bstr str1, struct bstr str2)
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{
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int ret = 0;
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if (str1.len && str2.len)
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ret = memcmp(str1.start, str2.start, MPMIN(str1.len, str2.len));
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if (!ret) {
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if (str1.len == str2.len)
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return 0;
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else if (str1.len > str2.len)
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return 1;
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else
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return -1;
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}
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return ret;
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}
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int bstrcasecmp(struct bstr str1, struct bstr str2)
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{
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int ret = 0;
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if (str1.len && str2.len)
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ret = strncasecmp(str1.start, str2.start, MPMIN(str1.len, str2.len));
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if (!ret) {
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if (str1.len == str2.len)
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return 0;
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else if (str1.len > str2.len)
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return 1;
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else
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return -1;
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}
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return ret;
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}
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int bstrchr(struct bstr str, int c)
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{
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for (int i = 0; i < str.len; i++)
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if (str.start[i] == c)
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return i;
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return -1;
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}
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int bstrrchr(struct bstr str, int c)
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{
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for (int i = str.len - 1; i >= 0; i--)
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if (str.start[i] == c)
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return i;
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return -1;
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}
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int bstrcspn(struct bstr str, const char *reject)
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{
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int i;
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for (i = 0; i < str.len; i++)
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if (strchr(reject, str.start[i]))
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break;
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return i;
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}
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int bstrspn(struct bstr str, const char *accept)
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{
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int i;
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for (i = 0; i < str.len; i++)
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if (!strchr(accept, str.start[i]))
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break;
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return i;
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}
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int bstr_find(struct bstr haystack, struct bstr needle)
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{
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for (int i = 0; i < haystack.len; i++)
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if (bstr_startswith(bstr_splice(haystack, i, haystack.len), needle))
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return i;
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return -1;
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}
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struct bstr bstr_lstrip(struct bstr str)
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{
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while (str.len && mp_isspace(*str.start)) {
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str.start++;
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str.len--;
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}
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return str;
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}
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struct bstr bstr_strip(struct bstr str)
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{
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str = bstr_lstrip(str);
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while (str.len && mp_isspace(str.start[str.len - 1]))
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str.len--;
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return str;
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}
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struct bstr bstr_split(struct bstr str, const char *sep, struct bstr *rest)
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{
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int start;
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for (start = 0; start < str.len; start++)
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if (!strchr(sep, str.start[start]))
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break;
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str = bstr_cut(str, start);
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int end = bstrcspn(str, sep);
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if (rest) {
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*rest = bstr_cut(str, end);
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}
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return bstr_splice(str, 0, end);
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}
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// Unlike with bstr_split(), tok is a string, and not a set of char.
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// If tok is in str, return true, and: concat(out_left, tok, out_right) == str
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// Otherwise, return false, and set out_left==str, out_right==""
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bool bstr_split_tok(bstr str, const char *tok, bstr *out_left, bstr *out_right)
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{
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bstr bsep = bstr0(tok);
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int pos = bstr_find(str, bsep);
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if (pos < 0)
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pos = str.len;
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*out_left = bstr_splice(str, 0, pos);
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*out_right = bstr_cut(str, pos + bsep.len);
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return pos != str.len;
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}
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struct bstr bstr_splice(struct bstr str, int start, int end)
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{
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if (start < 0)
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start += str.len;
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if (end < 0)
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end += str.len;
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end = MPMIN(end, str.len);
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start = MPMAX(start, 0);
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end = MPMAX(end, start);
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str.start += start;
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str.len = end - start;
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return str;
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}
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long long bstrtoll(struct bstr str, struct bstr *rest, int base)
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{
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str = bstr_lstrip(str);
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char buf[51];
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int len = MPMIN(str.len, 50);
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memcpy(buf, str.start, len);
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buf[len] = 0;
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char *endptr;
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long long r = strtoll(buf, &endptr, base);
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if (rest)
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*rest = bstr_cut(str, endptr - buf);
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return r;
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}
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double bstrtod(struct bstr str, struct bstr *rest)
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{
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str = bstr_lstrip(str);
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char buf[101];
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int len = MPMIN(str.len, 100);
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memcpy(buf, str.start, len);
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buf[len] = 0;
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char *endptr;
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double r = strtod(buf, &endptr);
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if (rest)
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*rest = bstr_cut(str, endptr - buf);
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return r;
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}
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struct bstr bstr_splitchar(struct bstr str, struct bstr *rest, const char c)
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{
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int pos = bstrchr(str, c);
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if (pos < 0)
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pos = str.len;
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if (rest)
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*rest = bstr_cut(str, pos + 1);
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return bstr_splice(str, 0, pos + 1);
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}
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struct bstr bstr_strip_linebreaks(struct bstr str)
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{
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if (bstr_endswith0(str, "\r\n")) {
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str = bstr_splice(str, 0, str.len - 2);
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} else if (bstr_endswith0(str, "\n")) {
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str = bstr_splice(str, 0, str.len - 1);
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}
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return str;
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}
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bool bstr_eatstart(struct bstr *s, struct bstr prefix)
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{
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if (!bstr_startswith(*s, prefix))
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return false;
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*s = bstr_cut(*s, prefix.len);
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return true;
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}
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bool bstr_eatend(struct bstr *s, struct bstr prefix)
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{
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if (!bstr_endswith(*s, prefix))
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return false;
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s->len -= prefix.len;
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return true;
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}
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void bstr_lower(struct bstr str)
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{
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for (int i = 0; i < str.len; i++)
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str.start[i] = mp_tolower(str.start[i]);
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}
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int bstr_sscanf(struct bstr str, const char *format, ...)
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{
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char *ptr = bstrdup0(NULL, str);
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va_list va;
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va_start(va, format);
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int ret = vsscanf(ptr, format, va);
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va_end(va);
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talloc_free(ptr);
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return ret;
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}
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int bstr_parse_utf8_code_length(unsigned char b)
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{
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if (b < 128)
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return 1;
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int bytes = 7 - mp_log2(b ^ 255);
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return (bytes >= 2 && bytes <= 4) ? bytes : -1;
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}
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int bstr_decode_utf8(struct bstr s, struct bstr *out_next)
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{
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if (s.len == 0)
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return -1;
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unsigned int codepoint = s.start[0];
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s.start++; s.len--;
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if (codepoint >= 128) {
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int bytes = bstr_parse_utf8_code_length(codepoint);
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if (bytes < 1 || s.len < bytes - 1)
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return -1;
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codepoint &= 127 >> bytes;
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for (int n = 1; n < bytes; n++) {
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int tmp = (unsigned char)s.start[0];
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if ((tmp & 0xC0) != 0x80)
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return -1;
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codepoint = (codepoint << 6) | (tmp & ~0xC0);
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s.start++; s.len--;
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}
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if (codepoint > 0x10FFFF || (codepoint >= 0xD800 && codepoint <= 0xDFFF))
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return -1;
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// Overlong sequences - check taken from libavcodec.
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// (The only reason we even bother with this is to make libavcodec's
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// retarded subtitle utf-8 check happy.)
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unsigned int min = bytes == 2 ? 0x80 : 1 << (5 * bytes - 4);
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if (codepoint < min)
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return -1;
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}
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if (out_next)
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*out_next = s;
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return codepoint;
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}
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struct bstr bstr_split_utf8(struct bstr str, struct bstr *out_next)
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{
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bstr rest;
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int code = bstr_decode_utf8(str, &rest);
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if (code < 0)
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return (bstr){0};
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if (out_next)
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*out_next = rest;
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return bstr_splice(str, 0, str.len - rest.len);
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}
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int bstr_validate_utf8(struct bstr s)
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{
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while (s.len) {
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if (bstr_decode_utf8(s, &s) < 0) {
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// Try to guess whether the sequence was just cut-off.
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unsigned int codepoint = (unsigned char)s.start[0];
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int bytes = bstr_parse_utf8_code_length(codepoint);
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if (bytes > 1 && s.len < 6) {
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// Manually check validity of left bytes
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for (int n = 1; n < bytes; n++) {
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if (n >= s.len) {
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// Everything valid until now - just cut off.
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return -(bytes - s.len);
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}
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int tmp = (unsigned char)s.start[n];
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if ((tmp & 0xC0) != 0x80)
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break;
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}
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}
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return -8;
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}
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}
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return 0;
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}
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struct bstr bstr_sanitize_utf8_latin1(void *talloc_ctx, struct bstr s)
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{
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bstr new = {0};
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bstr left = s;
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unsigned char *first_ok = s.start;
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while (left.len) {
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int r = bstr_decode_utf8(left, &left);
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if (r < 0) {
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bstr_xappend(talloc_ctx, &new, (bstr){first_ok, left.start - first_ok});
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mp_append_utf8_bstr(talloc_ctx, &new, (unsigned char)left.start[0]);
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left.start += 1;
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left.len -= 1;
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first_ok = left.start;
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}
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}
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if (!new.start)
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return s;
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if (first_ok != left.start)
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bstr_xappend(talloc_ctx, &new, (bstr){first_ok, left.start - first_ok});
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return new;
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}
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static void resize_append(void *talloc_ctx, bstr *s, size_t append_min)
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{
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size_t size = talloc_get_size(s->start);
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assert(s->len <= size);
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if (append_min > size - s->len) {
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if (append_min < size)
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append_min = size; // preallocate in power of 2s
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if (size >= SIZE_MAX / 2 || append_min >= SIZE_MAX / 2)
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abort(); // oom
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s->start = talloc_realloc_size(talloc_ctx, s->start, size + append_min);
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}
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}
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// Append the string, so that *s = *s + append. s->start is expected to be
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// a talloc allocation (which can be realloced) or NULL.
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// This function will always implicitly append a \0 after the new string for
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// convenience.
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// talloc_ctx will be used as parent context, if s->start is NULL.
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void bstr_xappend(void *talloc_ctx, bstr *s, bstr append)
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{
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if (!append.len)
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return;
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resize_append(talloc_ctx, s, append.len + 1);
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memcpy(s->start + s->len, append.start, append.len);
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s->len += append.len;
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s->start[s->len] = '\0';
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}
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void bstr_xappend_asprintf(void *talloc_ctx, bstr *s, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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bstr_xappend_vasprintf(talloc_ctx, s, fmt, ap);
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va_end(ap);
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}
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// Exactly as bstr_xappend(), but with a formatted string.
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void bstr_xappend_vasprintf(void *talloc_ctx, bstr *s, const char *fmt,
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va_list ap)
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{
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int size;
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va_list copy;
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va_copy(copy, ap);
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size_t avail = talloc_get_size(s->start) - s->len;
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char *dest = s->start ? s->start + s->len : NULL;
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char c;
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if (avail < 1)
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dest = &c;
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size = vsnprintf(dest, MPMAX(avail, 1), fmt, copy);
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va_end(copy);
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if (size < 0)
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abort();
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if (avail < 1 || size + 1 > avail) {
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resize_append(talloc_ctx, s, size + 1);
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vsnprintf(s->start + s->len, size + 1, fmt, ap);
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}
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s->len += size;
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}
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bool bstr_case_startswith(struct bstr s, struct bstr prefix)
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{
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struct bstr start = bstr_splice(s, 0, prefix.len);
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return start.len == prefix.len && bstrcasecmp(start, prefix) == 0;
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}
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bool bstr_case_endswith(struct bstr s, struct bstr suffix)
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{
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struct bstr end = bstr_cut(s, -suffix.len);
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return end.len == suffix.len && bstrcasecmp(end, suffix) == 0;
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}
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struct bstr bstr_strip_ext(struct bstr str)
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{
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int dotpos = bstrrchr(str, '.');
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if (dotpos < 0)
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return str;
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return (struct bstr){str.start, dotpos};
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}
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struct bstr bstr_get_ext(struct bstr s)
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{
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int dotpos = bstrrchr(s, '.');
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if (dotpos < 0)
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return (struct bstr){NULL, 0};
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return bstr_splice(s, dotpos + 1, s.len);
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}
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static int h_to_i(unsigned char c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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return -1; // invalid char
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}
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bool bstr_decode_hex(void *talloc_ctx, struct bstr hex, struct bstr *out)
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{
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if (!out)
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return false;
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char *arr = talloc_array(talloc_ctx, char, hex.len / 2);
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int len = 0;
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while (hex.len >= 2) {
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int a = h_to_i(hex.start[0]);
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int b = h_to_i(hex.start[1]);
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hex = bstr_splice(hex, 2, hex.len);
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if (a < 0 || b < 0) {
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talloc_free(arr);
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return false;
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}
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arr[len++] = (a << 4) | b;
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}
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*out = (struct bstr){ .start = arr, .len = len };
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return true;
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}
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