forked from mia/Aegisub
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
// Copyright (c) 2013, Thomas Goyne <plorkyeran@aegisub.org>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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// Aegisub Project http://www.aegisub.org/
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#include "../config.h"
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#include "libaegisub/ass/uuencode.h"
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// Despite being called uuencoding by ass_specs.doc, the format is actually
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// somewhat different from real uuencoding. Each 3-byte chunk is split into 4
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// 6-bit pieces, then 33 is added to each piece. Lines are wrapped after 80
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// characters, and files with non-multiple-of-three lengths are padded with
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// zero.
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namespace agi { namespace ass {
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std::vector<char> UUDecode(std::string const& str) {
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std::vector<char> ret;
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ret.reserve(str.size() * 3 / 4);
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for(size_t pos = 0; pos + 1 < str.size(); pos += 4) {
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size_t bytes = std::min<size_t>(str.size() - pos, 4);
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unsigned char src[4] = { '\0', '\0', '\0', '\0' };
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for (size_t i = 0; i < bytes; ++i)
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src[i] = str[pos + i] - 33;
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ret.push_back((src[0] << 2) | (src[1] >> 4));
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if (bytes > 2)
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ret.push_back(((src[1] & 0xF) << 4) | (src[2] >> 2));
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if (bytes > 3)
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ret.push_back(((src[2] & 0x3) << 6) | (src[3]));
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}
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return ret;
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}
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std::string UUEncode(std::vector<char> const& data) {
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std::string ret;
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ret.reserve((data.size() * 4 + 2) / 3 + data.size() / 80 * 2);
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size_t written = 0;
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for (size_t pos = 0; pos < data.size(); pos += 3) {
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unsigned char src[3] = { '\0', '\0', '\0' };
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memcpy(src, &data[pos], std::min<size_t>(3u, data.size() - pos));
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unsigned char dst[4] = {
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static_cast<unsigned char>(src[0] >> 2),
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static_cast<unsigned char>(((src[0] & 0x3) << 4) | ((src[1] & 0xF0) >> 4)),
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static_cast<unsigned char>(((src[1] & 0xF) << 2) | ((src[2] & 0xC0) >> 6)),
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static_cast<unsigned char>(src[2] & 0x3F)
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};
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for (size_t i = 0; i < std::min<size_t>(data.size() - pos + 1, 4u); ++i) {
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ret += dst[i] + 33;
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if (++written == 80 && pos + 3 < data.size()) {
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written = 0;
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ret += "\r\n";
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}
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}
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}
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return ret;
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}
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} }
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