mirror of
https://github.com/pikvm/ustreamer.git
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80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
/*****************************************************************************
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# #
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# uStreamer - Lightweight and fast MJPEG-HTTP streamer. #
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# #
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# Copyright (C) 2018-2023 Maxim Devaev <mdevaev@gmail.com> #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program 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 General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <https://www.gnu.org/licenses/>. #
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# #
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*****************************************************************************/
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#include "base64.h"
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include "types.h"
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#include "tools.h"
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static const char _ENCODING_TABLE[] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z', '0', '1', '2', '3',
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'4', '5', '6', '7', '8', '9', '+', '/',
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};
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static const uint _MOD_TABLE[] = {0, 2, 1};
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void us_base64_encode(const u8 *data, uz size, char **encoded, uz *allocated) {
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const uz encoded_size = 4 * ((size + 2) / 3) + 1; // +1 for '\0'
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if (*encoded == NULL || (allocated && *allocated < encoded_size)) {
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US_REALLOC(*encoded, encoded_size);
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if (allocated) {
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*allocated = encoded_size;
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}
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}
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for (uint data_index = 0, encoded_index = 0; data_index < size;) {
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# define OCTET(_name) uint _name = (data_index < size ? (u8)data[data_index++] : 0)
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OCTET(octet_a);
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OCTET(octet_b);
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OCTET(octet_c);
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# undef OCTET
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const uint triple = (octet_a << 0x10) + (octet_b << 0x08) + octet_c;
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# define ENCODE(_offset) (*encoded)[encoded_index++] = _ENCODING_TABLE[(triple >> _offset * 6) & 0x3F]
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ENCODE(3);
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ENCODE(2);
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ENCODE(1);
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ENCODE(0);
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# undef ENCODE
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}
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for (uint index = 0; index < _MOD_TABLE[size % 3]; index++) {
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(*encoded)[encoded_size - 2 - index] = '=';
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}
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(*encoded)[encoded_size - 1] = '\0';
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}
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