Aegisub/devel/athenasub/src/text_file_reader.cpp
Amar Takhar 792225317e SVN Transition Step 6/7
1. svn mv OverLua SSATool athenasub avisynth_prs kanamemo \
     motiontracker prs traydict unit_test vsfilter devel/

* See r2749 for full description.

Originally committed to SVN as r2755.
2009-03-08 08:31:54 +00:00

254 lines
6.6 KiB
C++

// Copyright (c) 2005, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
///////////
// Headers
#include <algorithm>
#include <string>
#include <wx/wfstream.h>
#include "text_file_reader.h"
using namespace Athenasub;
#ifdef WITH_UNIVCHARDET
#include "charset_detect.h"
#endif
///////////////
// Constructor
TextFileReader::TextFileReader(wxInputStream &stream,String enc,bool _trim)
: file(stream)
{
// Setup
trim = _trim;
// Set encoding
encoding = enc.GetWxString();
if (encoding == _T("binary")) return;
SetEncodingConfiguration();
}
//////////////
// Destructor
TextFileReader::~TextFileReader()
{
}
//////////////////////////////
// Set encoding configuration
void TextFileReader::SetEncodingConfiguration()
{
// Set encoding configuration
swap = false;
Is16 = false;
isUtf8 = false;
//conv = shared_ptr<wxMBConv>();
if (encoding == _T("UTF-8")) {
conv = shared_ptr<wxMBConv> (new wxMBConvUTF8);
isUtf8 = true;
}
else if (encoding == _T("UTF-16LE")) {
Is16 = true;
}
else if (encoding == _T("UTF-16BE")) {
Is16 = true;
swap = true;
}
else if (encoding == _T("UTF-7")) {
conv = shared_ptr<wxMBConv>(new wxCSConv(encoding));
}
else if (encoding == _T("Local")) {
conv = shared_ptr<wxMBConv> (wxConvCurrent,NullDeleter());
}
else {
conv = shared_ptr<wxMBConv> (new wxCSConv(encoding));
}
// Allocate buffer
if (!Is16) buffer1.Alloc(4096);
else buffer2.Alloc(4096);
}
////////////////////
// Helper functions
String GetString(char *read,shared_ptr<wxMBConv> conv,bool isUtf8)
{
if (isUtf8) {
return String(read);
} else {
return String(wxString(read,*conv));
}
}
String GetString(wchar_t *read,shared_ptr<wxMBConv> conv,bool isUtf8)
{
(void)conv;
(void)isUtf8;
return String(read);
}
inline void Swap(wchar_t &a) {
char *c = (char*) &a;
char aux = c[0];
c[0] = c[1];
c[1] = aux;
}
inline void Swap(char &a) { (void) a; }
////////////////
// Parse a line
template <typename T>
void ParseLine(FastBuffer<T> &_buffer,wxInputStream &file,String &stringBuffer,shared_ptr<wxMBConv> conv,bool swap,bool isUtf8)
{
// Look for a new line
int newLinePos = -1;
T newLineChar = 0;
size_t size = _buffer.GetSize();
// Find first line break
if (size) _buffer.FindLineBreak(0,size,newLinePos,newLineChar);
// If no line breaks were found, load more data into file
while (newLinePos == -1) {
// Read 2048 bytes
const size_t readBytes = 1024;
const size_t read = readBytes/sizeof(T);
size_t oldSize = _buffer.GetSize();
T *ptr = _buffer.GetWritePtr(read);
file.Read(ptr,readBytes);
size_t lastRead = file.LastRead()/sizeof(T);
_buffer.AssumeSize(_buffer.GetSize()+lastRead-read);
// Swap
if (swap) {
T* ptr2 = ptr;
for (size_t i=0;i<lastRead;i++) {
Swap(*ptr2++);
}
}
// Find line break
_buffer.FindLineBreak(oldSize,lastRead+oldSize,newLinePos,newLineChar);
// End of file, force a line break
if (file.Eof() && newLinePos == -1) newLinePos = (int) _buffer.GetSize();
}
// Found newline
if (newLinePos != -1) {
T *read = _buffer.GetMutableReadPtr();
// Replace newline with null character and convert to proper charset
if (newLinePos) {
read[newLinePos] = 0;
stringBuffer = GetString(read,conv,isUtf8);
}
// Remove an extra character if the new is the complement of \n,\r (13^7=10, 10^7=13)
if (read[newLinePos+1] == (newLineChar ^ 7)) newLinePos++;
_buffer.ShiftLeft(newLinePos+1);
}
}
//////////////////////////
// Reads a line from file
Athenasub::String TextFileReader::ReadLineFromFile()
{
String stringBuffer;
size_t bufAlloc = 1024;
stringBuffer.reserve(bufAlloc);
std::string buffer = "";
// Read UTF-16 line from file
if (Is16) ParseLine<wchar_t>(buffer2,file,stringBuffer,conv,swap,false);
// Read ASCII/UTF-8 line from file
else ParseLine<char>(buffer1,file,stringBuffer,conv,false,isUtf8);
// Remove BOM (UTF-8 EF BB BF)
size_t startPos = 0;
if (stringBuffer.Length() >= 3) {
int b1 = (unsigned char) stringBuffer[0];
int b2 = (unsigned char) stringBuffer[1];
int b3 = (unsigned char) stringBuffer[2];
if (b1 == 0xEF && b2 == 0xBB && b3 == 0xBF) startPos = 3;
}
// Trim
String str = String(stringBuffer);
if (trim) return String(String::StringTrim(str,startPos));
if (startPos) return String(str.c_str() + startPos);
return str;
}
//////////////////////////////////
// Checks if there's more to read
bool TextFileReader::HasMoreLines()
{
return (!file.Eof() || buffer1.GetSize() || buffer2.GetSize());
}
////////////////////////////////
// Ensure that charset is valid
void TextFileReader::EnsureValid(Athenasub::String enc)
{
if (enc == "unknown" || enc == "UTF-32BE" || enc == "UTF-32LE") {
String error = "Character set ";
error += enc;
error += " is not supported.";
throw error.c_str();
}
}
///////////////////////////
// Get encoding being used
String TextFileReader::GetCurrentEncoding()
{
return String(encoding.c_str());
}
///////////////////
// Rewind the file
void TextFileReader::Rewind()
{
THROW_ATHENA_EXCEPTION(Exception::TODO);
}