162 lines
4.8 KiB
C++
162 lines
4.8 KiB
C++
// Copyright (c) 2010, Rodrigo Braz Monteiro, Thomas Goyne
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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//
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// $Id$
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/// @file text_file_reader.cpp
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/// @brief Read plain text files line by line
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/// @ingroup utility
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///
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#include "config.h"
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#ifndef AGI_PRE
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#include <assert.h>
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#include <errno.h>
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#include <algorithm>
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#include <fstream>
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#include <string>
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#endif
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#include <libaegisub/log.h>
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#include "charset_conv.h"
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#include "charset_detect.h"
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#include "text_file_reader.h"
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TextFileReader::TextFileReader(wxString const& filename, wxString encoding, bool trim)
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: isBinary(false)
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, conv()
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, trim(trim)
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, readComplete(false)
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, currout(0)
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, outptr(0)
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, currentLine(0)
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{
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#ifdef __WINDOWS__
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file.open(filename.wc_str(),std::ios::in | std::ios::binary);
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#else
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file.open(wxFNCONV(filename),std::ios::in | std::ios::binary);
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#endif
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if (!file.is_open()) throw L"Failed opening file for reading.";
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if (encoding.IsEmpty()) encoding = CharSetDetect::GetEncoding(filename);
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if (encoding == L"binary") {
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isBinary = true;
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return;
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}
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conv.reset(new agi::charset::IconvWrapper(encoding.c_str(), "wchar_t"));
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}
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TextFileReader::~TextFileReader() {
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}
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wchar_t TextFileReader::GetWChar() {
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// If there's already some converted characters waiting, return the next one
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if (++currout < outptr) {
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return *currout;
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}
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if (file.eof()) return 0;
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// Otherwise convert another block
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char inbuf[64];
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char *inptr = inbuf;
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size_t inbytesleft = sizeof(inbuf) - 4;
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int bytesAdded = 0;
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memset(inbuf, 0, inbytesleft);
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outptr = outbuf;
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outbytesleft = sizeof(outbuf);
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currout = outbuf;
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file.read(inbuf, inbytesleft);
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inbytesleft = file.gcount();
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if (inbytesleft == 0)
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return 0;
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do {
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// Without this const_cast the wrong overload is chosen
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size_t ret = conv->Convert(const_cast<const char**>(&inptr), &inbytesleft, reinterpret_cast<char **>(&outptr), &outbytesleft);
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if (ret != (size_t)-1) break;
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int err = errno;
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// If 64 chars do not fit into 256 wchar_ts the environment is so bizzare that doing
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// anything is probably futile
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assert(err != E2BIG);
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// (Hopefully) the edge of the buffer happened to split a multibyte character, so keep
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// adding one byte to the input buffer until either it succeeds or we add enough bytes to
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// complete any character
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if (++bytesAdded > 3)
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throw wxString::Format(L"Invalid input character found near line %u", currentLine);
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file.read(inptr + inbytesleft, 1);
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inbytesleft++;
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} while (!file.eof() && file.gcount());
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if (outptr > outbuf)
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return *currout;
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throw wxString::Format(L"Invalid input character found near line %u", currentLine);
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}
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wxString TextFileReader::ReadLineFromFile() {
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wxString buffer;
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buffer.Alloc(1024);
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currentLine++;
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// Read a line
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wchar_t ch;
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bool first = true;
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// This doesn't work for \r deliminated files, but it's very unlikely
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// that we'll run into one of those
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for (ch = GetWChar(); ch != L'\n' && ch != 0; ch = GetWChar()) {
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if (ch == L'\r') continue;
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// Skip the BOM -- we don't need it as the encoding is already known
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// and it sometimes causes conversion problems
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if (ch == 0xFEFF && first) continue;
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buffer += ch;
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first = false;
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}
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if (ch == 0)
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readComplete = true;
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if (trim) {
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buffer.Trim(true);
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buffer.Trim(false);
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}
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return buffer;
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}
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bool TextFileReader::HasMoreLines() {
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return !readComplete;
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}
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