IClipboard.cpp

/*
 * 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 "IClipboard.h"
#include "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);
}