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