// Copyright (c) 2006, 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
//


////////////
// Includes
#include "ass_attachment.h"


///////////////
// Constructor
AssAttachment::AssAttachment(wxString name) {
	filename = name;
	data = boost::shared_ptr<AttachData> (new AttachData);
}


//////////////
// Destructor
AssAttachment::~AssAttachment() {
}


/////////
// Clone
AssEntry *AssAttachment::Clone() {
	// New object
	AssAttachment *clone = new AssAttachment(filename);

	// Copy fields
	clone->data = data;

	// Return
	return clone;
}


////////////
// Get data
const DataVec &AssAttachment::GetData() {
	return data->GetData();
}


/////////////////
// Add more data
void AssAttachment::AddData(wxString _data) {
	data->AddData(_data);
}


//////////////////////
// Finish adding data
void AssAttachment::Finish() {
	data->Finish();
}


/////////////////////////////////////
// Get encoded data to write on file
const wxString AssAttachment::GetEntryData() {
	// Get data
	const DataVec &dat = data->GetData();
	int pos = 0;
	int size = dat.size();
	int written = 0;
	unsigned char src[3];
	unsigned char dst[4];

	// Write header
	wxString entryData;
	if (group == _T("[Fonts]")) entryData = _T("fontname: ");
	else entryData = _T("filename: ");
	entryData += filename + _T("\r\n");

	// Read three bytes
	while (pos+3 <= size) {
		// Read source
		src[0] = dat[pos];
		src[1] = dat[pos+1];
		src[2] = dat[pos+2];
		pos += 3;

		// Codify
		dst[0] = src[0] >> 2;
		dst[1] = ((src[0] & 0x3) << 4) | ((src[1] & 0xF0) >> 4);
		dst[2] = ((src[1] & 0xF) << 2) | ((src[2] & 0xC0) >> 6);
		dst[3] = src[2] & 0x3F;

		// Convert to text
		for (int i=0;i<4;i++) {
			entryData += wxChar(dst[i]+33);
			written++;

			// Line break
			if (written == 80) {
				written = 0;
				entryData += _T("\r\n");
			}
		}
	}

	// Return
	return entryData;
}



/////////////////// Attachment //////////////////
///////////////
// Constructor
AttachData::AttachData() {
}


//////////////
// Destructor
AttachData::~AttachData() {
}


////////////
// Get data
const DataVec &AttachData::GetData() {
	return data;
}


////////////
// Add data
void AttachData::AddData(wxString data) {
	buffer += data;
}


//////////
// Finish
void AttachData::Finish() {
	// Source and dest buffers
	unsigned char src[4];
	unsigned char dst[3];
	int bufPos = 0;
	bool ok = true;

	// Read buffer
	while (ok) {
		// Find characters left
		int left = buffer.Length() - bufPos;
		int nbytes;

		// At least four, proceed normally
		if (left >= 4) {
			// Move 4 bytes from buffer to src
			for (int i=0;i<4;i++) {
				src[i] = (unsigned char) buffer[bufPos] - 33;
				bufPos++;
			}
			ok = true;
			nbytes = 3;
		}

		// Zero, end
		else if (left == 0) {
			ok = false;
			break;
		}

		// Convert the 4 bytes from source to 3 in dst
		dst[0] = (src[0] << 2) | (src[1] >> 4);
		dst[1] = ((src[1] & 0xF) << 4) | (src[2] >> 2);
		dst[2] = ((src[2] & 0x3) << 6) | (src[3]);

		// Push into vector
		size_t size = data.size(); 
		data.resize(size+nbytes);
		for (int i=0;i<nbytes;i++) data[size+i] = dst[i];
	}

	// Clear buffer
	buffer.Clear();
	buffer.Shrink();
}