Last change
on this file since 3767 was 3621, checked in by Bruno Cornec, 8 years ago |
New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
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Property svn:eol-style
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File size:
1.4 KB
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[3621] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 4 | */
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| 5 |
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| 6 | //kbuild:lib-y += percent_decode.o
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| 7 |
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| 8 | #include "libbb.h"
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| 9 |
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| 10 | static unsigned hex_to_bin(unsigned char c)
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| 11 | {
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| 12 | unsigned v;
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| 13 |
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| 14 | v = c - '0';
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| 15 | if (v <= 9)
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| 16 | return v;
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| 17 | /* c | 0x20: letters to lower case, non-letters
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| 18 | * to (potentially different) non-letters */
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| 19 | v = (unsigned)(c | 0x20) - 'a';
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| 20 | if (v <= 5)
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| 21 | return v + 10;
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| 22 | return ~0;
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| 23 | /* For testing:
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| 24 | void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
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| 25 | int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
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| 26 | t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
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| 27 | */
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| 28 | }
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| 29 |
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| 30 | char* FAST_FUNC percent_decode_in_place(char *str, int strict)
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| 31 | {
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| 32 | /* note that decoded string is always shorter than original */
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| 33 | char *src = str;
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| 34 | char *dst = str;
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| 35 | char c;
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| 36 |
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| 37 | while ((c = *src++) != '\0') {
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| 38 | unsigned v;
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| 39 |
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| 40 | if (!strict && c == '+') {
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| 41 | *dst++ = ' ';
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| 42 | continue;
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| 43 | }
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| 44 | if (c != '%') {
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| 45 | *dst++ = c;
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| 46 | continue;
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| 47 | }
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| 48 | v = hex_to_bin(src[0]);
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| 49 | if (v > 15) {
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| 50 | bad_hex:
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| 51 | if (strict)
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| 52 | return NULL;
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| 53 | *dst++ = '%';
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| 54 | continue;
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| 55 | }
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| 56 | v = (v * 16) | hex_to_bin(src[1]);
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| 57 | if (v > 255)
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| 58 | goto bad_hex;
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| 59 | if (strict && (v == '/' || v == '\0')) {
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| 60 | /* caller takes it as indication of invalid
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| 61 | * (dangerous wrt exploits) chars */
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| 62 | return str + 1;
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| 63 | }
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| 64 | *dst++ = v;
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| 65 | src += 2;
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| 66 | }
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| 67 | *dst = '\0';
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| 68 | return str;
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| 69 | }
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