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59 lines
1.0 KiB
59 lines
1.0 KiB
#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "houdini.h"
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#define UNESCAPE_GROW_FACTOR(x) (x)
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#define hex2c(c) ((c | 32) % 39 - 9)
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static void
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unescape(struct buf *ob, const uint8_t *src, size_t size, int is_url)
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{
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size_t i = 0, org;
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bufgrow(ob, UNESCAPE_GROW_FACTOR(size));
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while (i < size) {
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org = i;
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while (i < size && src[i] != '%')
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i++;
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if (i > org)
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bufput(ob, src + org, i - org);
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/* escaping */
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if (i >= size)
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break;
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i++;
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if (i + 1 < size && _isxdigit(src[i]) && _isxdigit(src[i + 1])) {
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unsigned char new_char = (hex2c(src[i]) << 4) + hex2c(src[i + 1]);
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bufputc(ob, new_char);
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i += 2;
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} else {
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bufputc(ob, '%');
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}
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}
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if (is_url) {
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char *find = (char *)bufcstr(ob);
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while ((find = strchr(find, '+')) != NULL)
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*find = ' ';
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}
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}
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void
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houdini_unescape_uri(struct buf *ob, const uint8_t *src, size_t size)
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{
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return unescape(ob, src, size, 0);
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}
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void
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houdini_unescape_url(struct buf *ob, const uint8_t *src, size_t size)
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{
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return unescape(ob, src, size, 1);
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}
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