mirror of
https://github.com/shadowsocks/shadowsocks-libev.git
synced 2026-10-21 14:33:55 +00:00
Max Lv
8cb4f81eba
Add experimental HTTP/TLS obfuscating as an **optional extension** of shadowsocks protocol. More discussions can be found here: https://github.com/shadowsocks/shadowsocks-org/issues/26 As this feature is still a SIP (Shadowsocks Improvement Proposal), it's very unstable and experimental. So, 1. Don't enable it unless you know what it is. 2. Be very careful when using it in production environment.
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*
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* Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 GNU
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* 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief Base64 encode/decode
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* @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <limits.h>
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#include <stddef.h>
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#include "base64.h"
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/* ---------------- private code */
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static const uint8_t map2[] =
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{
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0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
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0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
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0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
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0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
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0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
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0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
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0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
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0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
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};
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int base64_decode(uint8_t *out, const char *in, int out_size)
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{
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int i, v;
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uint8_t *dst = out;
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v = 0;
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for (i = 0; in[i] && in[i] != '='; i++) {
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unsigned int index= in[i]-43;
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if (index >= sizeof(map2) || map2[index] == 0xff)
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return -1;
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v = (v << 6) + map2[index];
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if (i & 3) {
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if (dst - out < out_size) {
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*dst++ = v >> (6 - 2 * (i & 3));
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}
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}
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}
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return dst - out;
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}
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/*****************************************************************************
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* b64_encode: Stolen from VLC's http.c.
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* Simplified by Michael.
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* Fixed edge cases and made it work from data (vs. strings) by Ryan.
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*****************************************************************************/
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char *base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
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{
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static const char b64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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char *ret, *dst;
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unsigned i_bits = 0;
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int i_shift = 0;
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int bytes_remaining = in_size;
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if (in_size >= UINT_MAX / 4 ||
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out_size < BASE64_SIZE(in_size))
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return NULL;
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ret = dst = out;
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while (bytes_remaining) {
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i_bits = (i_bits << 8) + *in++;
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bytes_remaining--;
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i_shift += 8;
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do {
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*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
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i_shift -= 6;
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} while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
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}
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while ((dst - ret) & 3)
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*dst++ = '=';
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*dst = '\0';
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return ret;
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}
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