mirror of https://github.com/odrling/Aegisub
301 lines
7.5 KiB
C++
301 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 <algorithm>
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#include <string>
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#include <wx/wfstream.h>
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#include "text_file_reader.h"
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using namespace Athenasub;
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#ifdef WITH_UNIVCHARDET
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#include "charset_detect.h"
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#endif
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///////////////
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// Constructor
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TextFileReader::TextFileReader(wxInputStream &stream,Athenasub::String enc,bool _trim,bool prefetch)
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: file(stream)
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{
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// Setup
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trim = _trim;
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threaded = prefetch && false;
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thread = NULL;
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// Set encoding
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encoding = enc.GetWxString();
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if (encoding == _T("binary")) return;
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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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{
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wxCriticalSectionLocker locker(mutex);
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if (thread) thread->Delete();
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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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{
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// Set encoding configuration
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swap = false;
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Is16 = false;
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//conv = shared_ptr<wxMBConv>();
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if (encoding == _T("UTF-8")) {
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conv = shared_ptr<wxMBConv> (new wxMBConvUTF8);
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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 = shared_ptr<wxMBConv>(new wxCSConv(encoding));
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}
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else if (encoding == _T("Local")) {
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conv = shared_ptr<wxMBConv> (wxConvCurrent,NullDeleter());
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}
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else {
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conv = shared_ptr<wxMBConv> (new wxCSConv(encoding));
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}
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// Allocate buffer
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if (!Is16) buffer1.Alloc(4096);
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else buffer2.Alloc(4096);
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}
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////////////////////
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// Helper functions
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wxString GetString(char *read,shared_ptr<wxMBConv> conv) { return wxString(read,*conv); }
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wxString GetString(wchar_t *read,shared_ptr<wxMBConv> conv) { (void)conv; return wxString(read); }
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inline void Swap(wchar_t &a) {
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char *c = (char*) &a;
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char aux = c[0];
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c[0] = c[1];
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c[1] = aux;
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}
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inline void Swap(char &a) { (void) a; }
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////////////////
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// Parse a line
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template <typename T>
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void ParseLine(FastBuffer<T> &_buffer,wxInputStream &file,wxString &stringBuffer,shared_ptr<wxMBConv> conv,bool swap)
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{
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// Look for a new line
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int newLinePos = -1;
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T newLineChar = 0;
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size_t size = _buffer.GetSize();
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// Find first line break
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if (size) _buffer.FindLineBreak(0,size,newLinePos,newLineChar);
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// If no line breaks were found, load more data into file
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while (newLinePos == -1) {
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// Read 2048 bytes
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const size_t readBytes = 1024;
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const size_t read = readBytes/sizeof(T);
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size_t oldSize = _buffer.GetSize();
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T *ptr = _buffer.GetWritePtr(read);
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file.Read(ptr,readBytes);
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size_t lastRead = file.LastRead()/sizeof(T);
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_buffer.AssumeSize(_buffer.GetSize()+lastRead-read);
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// Swap
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if (swap) {
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T* ptr2 = ptr;
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for (size_t i=0;i<lastRead;i++) {
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Swap(*ptr2++);
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}
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}
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// Find line break
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_buffer.FindLineBreak(oldSize,lastRead+oldSize,newLinePos,newLineChar);
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// End of file, force a line break
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if (file.Eof() && newLinePos == -1) newLinePos = (int) _buffer.GetSize();
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}
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// Found newline
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if (newLinePos != -1) {
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T *read = _buffer.GetMutableReadPtr();
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// Replace newline with null character and convert to proper charset
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if (newLinePos) {
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read[newLinePos] = 0;
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stringBuffer = GetString(read,conv);
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}
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// Remove an extra character if the new is the complement of \n,\r (13^7=10, 10^7=13)
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if (read[newLinePos+1] == (newLineChar ^ 7)) newLinePos++;
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_buffer.ShiftLeft(newLinePos+1);
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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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Athenasub::String TextFileReader::ActuallyReadLine()
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{
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wxString stringBuffer;
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size_t bufAlloc = 1024;
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stringBuffer.Alloc(bufAlloc);
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std::string buffer = "";
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// Read UTF-16 line from file
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if (Is16) ParseLine<wchar_t>(buffer2,file,stringBuffer,conv,swap);
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// Read ASCII/UTF-8 line from file
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else ParseLine<char>(buffer1,file,stringBuffer,conv,false);
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// Remove BOM
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size_t startPos = 0;
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if (stringBuffer.Length() > 0 && stringBuffer[0] == 0xFEFF) startPos = 3;
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// Trim
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String str = String(stringBuffer);
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if (trim) return String(String::StringTrim(str,startPos));
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if (startPos) return String(str.c_str() + startPos);
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return str;
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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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{
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if (cache.size()) return true;
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wxCriticalSectionLocker locker(mutex);
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return (!file.Eof() || buffer1.GetSize() || buffer2.GetSize());
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}
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////////////////////////////////
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// Ensure that charset is valid
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void TextFileReader::EnsureValid(Athenasub::String enc)
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{
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if (enc == "unknown" || enc == "UTF-32BE" || enc == "UTF-32LE") {
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String error = "Character set ";
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error += enc;
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error += " is not supported.";
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throw error.c_str();
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}
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}
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///////////////////////////
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// Get encoding being used
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String TextFileReader::GetCurrentEncoding()
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{
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return encoding.c_str();
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}
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///////////////////////////
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// Reads a line from cache
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String TextFileReader::ReadLineFromFile()
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{
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// Not threaded, just return it
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if (!threaded) return ActuallyReadLine();
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// Load into cache if needed
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String final;
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{
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wxCriticalSectionLocker locker(mutex);
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if (cache.size() == 0) {
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cache.push_back(ActuallyReadLine());
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}
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}
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{
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// Retrieve from cache
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wxCriticalSectionLocker locker(mutex);
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if (cache.size()) {
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final = cache.front();
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cache.pop_front();
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}
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// Start the thread to prefetch more
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if (cache.size() < 3 && thread == NULL) {
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thread = new PrefetchThread(this);
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thread->Create();
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thread->Run();
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}
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}
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return final;
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}
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////////////////
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// Thread entry
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wxThread::ExitCode PrefetchThread::Entry()
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{
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// Lock
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bool run = true;
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while (run) {
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if (TestDestroy()) {
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parent->thread = NULL;
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return 0;
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}
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{
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wxCriticalSectionLocker locker(parent->mutex);
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if (parent->cache.size() < 6) {
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if (!parent->file.Eof()) {
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// Get line
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parent->cache.push_back(parent->ActuallyReadLine());
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}
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else run = false;
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}
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}
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Sleep(50);
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}
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// Die
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wxCriticalSectionLocker locker(parent->mutex);
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parent->thread = NULL;
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return 0;
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}
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