307 lines
7.5 KiB
C++
307 lines
7.5 KiB
C++
// Copyright (c) 2005, Rodrigo Braz Monteiro
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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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// -----------------------------------------------------------------------------
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//
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// AEGISUB
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//
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// Website: http://aegisub.cellosoft.com
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// Contact: mailto:zeratul@cellosoft.com
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//
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///////////
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// Headers
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#include <fstream>
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#include <algorithm>
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#include <string>
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#include "text_file_reader.h"
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///////////////
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// Constructor
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TextFileReader::TextFileReader(wxString _filename,wxString enc,bool _trim) {
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// Setup
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open = false;
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customConv = false;
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trim = _trim;
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filename = _filename;
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// Open file
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Open();
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// Set encoding
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encoding = enc;
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if (encoding.IsEmpty()) encoding = GetEncoding(filename);
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SetEncodingConfiguration();
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}
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//////////////
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// Destructor
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TextFileReader::~TextFileReader() {
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Close();
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// Clean up conversion
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if (customConv) delete conv;
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}
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///////////////////////////
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// Determine file encoding
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wxString TextFileReader::GetEncoding(const wxString _filename) {
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// Prepare
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using namespace std;
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unsigned char b[4];
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for (int i=0;i<4;i++) b[i] = 0;
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// Read four bytes from file
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#ifdef WIN32
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// TODO: maybe make this use posix-style fopen() api's instead as well?
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HANDLE ifile = CreateFile(
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_filename.c_str(), // filename
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FILE_READ_DATA, // access mode
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FILE_SHARE_READ, // share mode
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0, // security descriptor
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OPEN_EXISTING, // creation disposition
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FILE_FLAG_SEQUENTIAL_SCAN, // flags
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0); // template file
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if (ifile == INVALID_HANDLE_VALUE) {
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return _T("unknown");
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}
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DWORD numread;
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if (!ReadFile(ifile, (char*)b, 4, &numread, 0)) {
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// Unable to open
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return _T("unknown");
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}
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if (numread < 4) {
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// File too short to decide, assume local
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return _T("Local");
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}
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CloseHandle(ifile);
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#else
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ifstream ifile;
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ifile.open(_filename.mb_str(wxConvLocal));
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if (!ifile.is_open()) {
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return _T("unknown");
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}
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ifile.read((char*)b,4);
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ifile.close();
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#endif
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// Try to get the byte order mark from them
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if (b[0] == 0xEF && b[1] == 0xBB && b[2] == 0xBF) return _T("UTF-8");
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else if (b[0] == 0xFF && b[1] == 0xFE && b[2] == 0x00 && b[3] == 0x00) return _T("UTF-32LE");
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else if (b[0] == 0x00 && b[1] == 0x00 && b[2] == 0xFE && b[3] == 0xFF) return _T("UTF-32BE");
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else if (b[0] == 0xFF && b[1] == 0xFE) return _T("UTF-16LE");
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else if (b[0] == 0xFE && b[1] == 0xFF) return _T("UTF-16BE");
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else if (b[0] == 0x2B && b[1] == 0x2F && b[2] == 0x76) return _T("UTF-7");
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// Try to guess UTF-16
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else if (b[0] == 0x00 && b[2] == 0x00) return _T("UTF-16BE");
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else if (b[1] == 0x00 && b[3] == 0x00) return _T("UTF-16LE");
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// Fallback to ascii
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return _T("Local");
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}
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//////////////////////////////
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// Set encoding configuration
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void TextFileReader::SetEncodingConfiguration() {
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// Set encoding configuration
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swap = false;
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Is16 = false;
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customConv = false;
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conv = NULL;
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if (encoding == _T("UTF-8")) {
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conv = new wxMBConvUTF8;
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customConv = true;
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}
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else if (encoding == _T("UTF-16LE")) {
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Is16 = true;
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}
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else if (encoding == _T("UTF-16BE")) {
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Is16 = true;
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swap = true;
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}
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else if (encoding == _T("UTF-7")) {
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conv = new wxCSConv(encoding);
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customConv = true;
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}
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else if (encoding == _T("Local")) {
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conv = wxConvCurrent;
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}
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else {
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conv = new wxCSConv(encoding);
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customConv = true;
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}
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}
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//////////////////////////
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// Reads a line from file
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wxString TextFileReader::ReadLineFromFile() {
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Open();
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wxString wxbuffer = _T("");
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// Read UTF-16 line from file
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if (Is16) {
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char charbuffer[3];
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charbuffer[2] = 0;
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char aux;
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wchar_t ch = 0;
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int n = 0;
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#ifdef WIN32
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while (ch != L'\n' && !feof(file)) {
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// Read two chars from file
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fread(charbuffer, 2, 1, file);
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#else
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while (ch != L'\n' && !file.eof()) {
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// Read two chars from file
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file.read(charbuffer,2);
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#endif
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// Swap bytes for big endian
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if (swap) {
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aux = charbuffer[0];
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charbuffer[0] = charbuffer[1];
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charbuffer[1] = aux;
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}
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// Convert two chars into a widechar and append to string
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ch = *((wchar_t*)charbuffer);
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wxbuffer += ch;
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n++;
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}
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}
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// Read ASCII/UTF-8 line from file
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else {
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#ifdef WIN32
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char buffer[512];
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while (1) {
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buffer[511] = '\1';
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if (fgets(buffer, 512, file)) {
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// read succeeded
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// FIXME, this might break on incomplete multibyte characters
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wxString linepart(buffer, *conv);
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wxbuffer += linepart;
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if (buffer[511] == '\1') {
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// our sentinel \1 wasn't overwritten, meaning an EOL was found
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break;
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}
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// otherwise the sentinel \1 was overwritten (presumably with \0), so just loop on
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}
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else {
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// hit EOF
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break;
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}
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}
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#else
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std::string buffer;
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getline(file,buffer);
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wxString lineresult(buffer.c_str(),*conv);
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wxbuffer = lineresult;
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#endif
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}
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// Remove line breaks
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wxbuffer.Replace(_T("\r"),_T(""));
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wxbuffer.Replace(_T("\n"),_T(""));
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// Final string
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wxString final = wxString(wxbuffer);
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// Remove BOM
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if (final.length() > 0 && final[0] == 0xFEFF) {
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final = final.Mid(1);
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}
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// Trim
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if (trim) {
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final.Trim(true);
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final.Trim(false);
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}
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return final;
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}
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/////////////
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// Open file
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void TextFileReader::Open() {
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if (open) return;
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#ifdef WIN32
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// binary mode, because ascii mode is never to be trusted
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file = _tfopen(filename.c_str(), _T("rb"));
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if (file == 0) {
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throw _T("Failed opening file for reading.");
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}
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#else
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file.open(filename.mb_str(wxConvLocal),std::ios::in | std::ios::binary);
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if (!file.is_open()) {
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throw _T("Failed opening file for reading.");
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}
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#endif
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open = true;
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}
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//////////////
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// Close file
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void TextFileReader::Close() {
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if (!open) return;
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#ifdef WIN32
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fclose(file);
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#else
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file.close();
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#endif
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open = false;
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}
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//////////////////////////////////
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// Checks if there's more to read
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bool TextFileReader::HasMoreLines() {
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#ifdef WIN32
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return !feof(file);
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#else
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return (!file.eof());
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#endif
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}
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////////////////////////////////
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// Ensure that charset is valid
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void TextFileReader::EnsureValid(wxString enc) {
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if (enc == _T("unknown") || enc == _T("UTF-32BE") || enc == _T("UTF-32LE")) {
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wxString error = _T("Character set ");
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error += enc;
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error += _T(" is not supported.");
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throw error;
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}
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}
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