forked from mia/Aegisub
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
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// 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 <libaegisub/ass/uuencode.h>
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#include <algorithm>
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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::string UUEncode(const char *begin, const char *end, bool insert_linebreaks) {
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size_t size = std::distance(begin, end);
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std::string ret;
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ret.reserve((size * 4 + 2) / 3 + size / 80 * 2);
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size_t written = 0;
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for (size_t pos = 0; pos < size; pos += 3) {
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unsigned char src[3] = { '\0', '\0', '\0' };
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memcpy(src, begin + pos, std::min<size_t>(3u, 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>(size - pos + 1, 4u); ++i) {
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ret += dst[i] + 33;
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if (insert_linebreaks && ++written == 80 && pos + 3 < 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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std::vector<char> UUDecode(const char *begin, const char *end) {
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std::vector<char> ret;
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size_t len = end - begin;
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ret.reserve(len * 3 / 4);
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for (size_t pos = 0; pos + 1 < len; ) {
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size_t bytes = 0;
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unsigned char src[4] = { '\0', '\0', '\0', '\0' };
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for (size_t i = 0; i < 4 && pos < len; ++pos) {
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char c = begin[pos];
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if (c && c != '\n' && c != '\r') {
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src[i++] = c - 33;
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++bytes;
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}
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}
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if (bytes > 1)
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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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} }
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