/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012 Bolton Software Ltd.
 * Copyright (C) 2004 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file COPYING that should have accompanied this file.
 * 
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "synergy/IClipboard.h"
#include "common/stdvector.h"

//
// IClipboard
//

void
IClipboard::unmarshall(IClipboard* clipboard, const CString& data, Time time)
{
	assert(clipboard != NULL);

	const char* index = data.data();

	// clear existing data
	clipboard->open(time);
	clipboard->empty();

	// read the number of formats
	const UInt32 numFormats = readUInt32(index);
	index += 4;

	// read each format
	for (UInt32 i = 0; i < numFormats; ++i) {
		// get the format id
		IClipboard::EFormat format =
			static_cast<IClipboard::EFormat>(readUInt32(index));
		index += 4;

		// get the size of the format data
		UInt32 size = readUInt32(index);
		index += 4;

		// save the data if it's a known format.  if either the client
		// or server supports more clipboard formats than the other
		// then one of them will get a format >= kNumFormats here.
		if (format <IClipboard::kNumFormats) {
			clipboard->add(format, CString(index, size));
		}
		index += size;
	}

	// done
	clipboard->close();
}

CString
IClipboard::marshall(const IClipboard* clipboard)
{
	assert(clipboard != NULL);

	CString data;

	std::vector<CString> formatData;
	formatData.resize(IClipboard::kNumFormats);
	// FIXME -- use current time
	clipboard->open(0);

	// compute size of marshalled data
	UInt32 size = 4;
	UInt32 numFormats = 0;
	for (UInt32 format = 0; format != IClipboard::kNumFormats; ++format) {
		if (clipboard->has(static_cast<IClipboard::EFormat>(format))) {
			++numFormats;
			formatData[format] =
				clipboard->get(static_cast<IClipboard::EFormat>(format));
			size += 4 + 4 + (UInt32)formatData[format].size();
		}
	}

	// allocate space
	data.reserve(size);

	// marshall the data
	writeUInt32(&data, numFormats);
	for (UInt32 format = 0; format != IClipboard::kNumFormats; ++format) {
		if (clipboard->has(static_cast<IClipboard::EFormat>(format))) {
			writeUInt32(&data, format);
			writeUInt32(&data, (UInt32)formatData[format].size());
			data += formatData[format];
		}
	}
	clipboard->close();

	return data;
}

bool
IClipboard::copy(IClipboard* dst, const IClipboard* src)
{
	assert(dst != NULL);
	assert(src != NULL);

	return copy(dst, src, src->getTime());
}

bool
IClipboard::copy(IClipboard* dst, const IClipboard* src, Time time)
{
	assert(dst != NULL);
	assert(src != NULL);

	bool success = false;
	if (src->open(time)) {
		if (dst->open(time)) {
			if (dst->empty()) {
				for (SInt32 format = 0;
								format != IClipboard::kNumFormats; ++format) {
					IClipboard::EFormat eFormat = (IClipboard::EFormat)format;
					if (src->has(eFormat)) {
						dst->add(eFormat, src->get(eFormat));
					}
				}
				success = true;
			}
			dst->close();
		}
		src->close();
	}

	return success;
}

UInt32
IClipboard::readUInt32(const char* buf)
{
	const unsigned char* ubuf = reinterpret_cast<const unsigned char*>(buf);
	return	(static_cast<UInt32>(ubuf[0]) << 24) |
			(static_cast<UInt32>(ubuf[1]) << 16) |
			(static_cast<UInt32>(ubuf[2]) <<  8) |
			 static_cast<UInt32>(ubuf[3]);
}

void
IClipboard::writeUInt32(CString* buf, UInt32 v)
{
	*buf += static_cast<UInt8>((v >> 24) & 0xff);
	*buf += static_cast<UInt8>((v >> 16) & 0xff);
	*buf += static_cast<UInt8>((v >>  8) & 0xff);
	*buf += static_cast<UInt8>( v        & 0xff);
}