public static void Compile(Stream[] streams, Stream output, uint pageSize)
{
// ðàñ÷èòûâàåì ðàçìåðû
uint streamsNumPages = 0;
uint numStreams = Int2UInt(streams.Length);
uint[] lengths = new uint[numStreams];
for (int i = 0; i < numStreams; i++)
{
lengths[i] = Long2UInt(streams[i].Length) - Long2UInt(streams[i].Position);
streamsNumPages += NumPages(lengths[i], pageSize);
}
uint rootStmSize = 0;
uint rootStmNumPages = 0;
while (true)
{
uint wasRootStmSize = rootStmSize;
rootStmNumPages = NumPages(rootStmSize, pageSize);
rootStmSize = 4 + 4 * (numStreams + 1) + 4 * (streamsNumPages + rootStmNumPages);
if (wasRootStmSize == rootStmSize)
break;
}
uint rootStmIndexSize = rootStmNumPages * 4;
uint rootStmIndexNumPages = NumPages(rootStmIndexSize, pageSize);
uint filePages = 0;
uint bitmapNumPages = 0;
uint bitmapSizeBits = 0;
while (true)
{
uint wasBitmapSizeBits = bitmapSizeBits;
bitmapNumPages = NumPages(bitmapSizeBits, pageSize * 8);
filePages = 1 + rootStmNumPages + streamsNumPages +
rootStmIndexNumPages + bitmapNumPages;
bitmapSizeBits = filePages;
if (wasBitmapSizeBits == bitmapSizeBits)
break;
}
uint startPage = 1 + bitmapNumPages;
byte[] pad = new byte[pageSize - 1];
byte[] onespad = new byte[pageSize - 1];
for (int i = 0; i < onespad.Length; i++)
onespad[i] = 0xff;
byte[] buffer;
// ïèøåì çàãîëîâîê
const string SIGNATURE = "Microsoft C/C++ MSF 7.00\r\n\x001ADS\0\0\0";
byte[] signature = Encoding.ASCII.GetBytes(SIGNATURE);
output.Write(signature, 0, signature.Length);
Header hdr = new Header();
hdr.PageSize = pageSize;
hdr.StartPage = startPage;
hdr.FilePages = filePages;
hdr.RootStreamSize = rootStmSize;
hdr.RootPageIndex = filePages - rootStmIndexNumPages;
buffer = GetBytes(hdr);
output.Write(buffer, 0, buffer.Length);
output.Write(pad, 0, PageRemains(Int2UInt(signature.Length +
Marshal.SizeOf(typeof(Header))), pageSize));
// ïèøåì áèòìàï
byte[] bitmap = new byte[NumPages(bitmapSizeBits, 8)];
byte lastByte = 0xff;
byte bit = 1;
uint lastByteBits = bitmapSizeBits - bitmapSizeBits / 8 * 8;
for (uint i = 0; i < lastByteBits; i++)
{
lastByte &= (byte)~bit;
bit <<= 1;
}
bitmap[bitmap.Length - 1] = lastByte;
output.Write(bitmap, 0, bitmap.Length);
output.Write(onespad, 0, PageRemains(NumPages(bitmapSizeBits, 8), pageSize));
// çàïèñûâàåì êîðíåâîé ñòðèì (îãëàâëåíèå)
buffer = BitConverter.GetBytes(numStreams + 1);
output.Write(buffer, 0, buffer.Length);
// ïèøåì ðàçìåð êîðíåâîãî (0-ãî) ñòðèìà
buffer = BitConverter.GetBytes(rootStmSize);
output.Write(buffer, 0, buffer.Length);
// ïèøåì ðàçìåðû îñòàëüíûõ ñòðèìîâ
foreach (uint len in lengths)
{
buffer = BitConverter.GetBytes(len);
output.Write(buffer, 0, buffer.Length);
}
// ïèøåì èíäåêñû ñòðàíèö êîðíåâîãî ñòðèìà
uint rootStmStartPage = startPage;
uint pageIndex = rootStmStartPage;
for (uint i = 0; i < rootStmNumPages; i++)
{
buffer = BitConverter.GetBytes(pageIndex);
output.Write(buffer, 0, buffer.Length);
pageIndex++;
}
// ïèøåì èíäåêñû ñòðàíèö îñòàëüíûõ ñòðèìîâ
for (uint s = 0; s < numStreams; s++)
{
for (uint i = 0; i < NumPages(lengths[s], pageSize); i++)
{
buffer = BitConverter.GetBytes(pageIndex);
output.Write(buffer, 0, buffer.Length);
pageIndex++;
}
}
output.Write(pad, 0, PageRemains(rootStmSize, pageSize));
// çàïèñûâàåì ñòðèìû
for (uint i = 0; i < numStreams; i++)
{
if (lengths[i] == 0)
continue;
PumpStreams(streams[i], output);
output.Write(pad, 0, PageRemains(lengths[i], pageSize));
}
// çàïèñûâàåì èíäåêñ îãëàâëåíèÿ
Debug.Assert(pageIndex == hdr.RootPageIndex);
pageIndex = rootStmStartPage;
for (uint i = 0; i < rootStmNumPages; i++)
{
buffer = BitConverter.GetBytes(pageIndex);
output.Write(buffer, 0, buffer.Length);
pageIndex++;
}
output.Write(pad, 0, PageRemains(rootStmIndexSize, pageSize));
}