forked from mia/Aegisub
80 lines
2.2 KiB
C++
80 lines
2.2 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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#include <libaegisub/line_iterator.h>
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#include <libaegisub/charset_conv.h>
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#include <boost/algorithm/string/case_conv.hpp>
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namespace agi {
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line_iterator_base::line_iterator_base(std::istream &stream, std::string encoding)
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: stream(&stream)
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{
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std::string encoding_lower{ encoding };
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boost::to_lower(encoding_lower);
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if (encoding_lower != "utf-8") {
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agi::charset::IconvWrapper c("utf-8", encoding.c_str());
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c.Convert("\r", 1, reinterpret_cast<char *>(&cr), sizeof(int));
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c.Convert("\n", 1, reinterpret_cast<char *>(&lf), sizeof(int));
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width = c.RequiredBufferSize("\n");
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conv = std::make_shared<agi::charset::IconvWrapper>(encoding.c_str(), "utf-8");
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}
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}
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bool line_iterator_base::getline(std::string &str) {
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if (!stream) return false;
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if (!stream->good()) {
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stream = nullptr;
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return false;
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}
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if (width == 1) {
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std::getline(*stream, str);
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if (str.size() && str.back() == '\r')
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str.pop_back();
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}
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else {
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union {
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int32_t chr;
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char buf[4];
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} u;
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for (;;) {
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u.chr = 0;
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std::streamsize read = stream->rdbuf()->sgetn(u.buf, width);
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if (read < (std::streamsize)width) {
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for (int i = 0; i < read; i++) {
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str += u.buf[i];
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}
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stream->setstate(std::ios::eofbit);
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break;
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}
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if (u.chr == cr) continue;
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if (u.chr == lf) break;
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for (int i = 0; i < read; i++) {
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str += u.buf[i];
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}
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}
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}
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if (conv.get()) {
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std::string tmp;
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conv->Convert(str, tmp);
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str = std::move(tmp);
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}
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return true;
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}
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}
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