internal void Read(
PdbStreamHelper reader,
int position,
byte[] bytes,
int offset,
int data)
{
if (position + data > _contentSize)
{
throw new PdbException(
"DataStream can't read off end of stream. " +
"(pos={0},siz={1})",
position,
data);
}
if (position == _contentSize)
{
return;
}
int left = data;
int page = position / reader.PageSize;
int rema = position % reader.PageSize;
// First get remained of first page.
if (rema != 0)
{
int todo = reader.PageSize - rema;
if (todo > left)
{
todo = left;
}
reader.Seek(_pages[page], rema);
reader.Read(bytes, offset, todo);
offset += todo;
left -= todo;
page++;
}
// Now get the remaining pages.
while (left > 0)
{
int todo = reader.PageSize;
if (todo > left)
{
todo = left;
}
reader.Seek(_pages[page], 0);
reader.Read(bytes, offset, todo);
offset += todo;
left -= todo;
page++;
}
}
internal MsfDirectory(PdbStreamHelper reader, PdbFileHeader head, BitAccess bits)
{
int pages = reader.PagesFromSize(head.DirectorySize);
// 0..n in page of directory pages.
bits.MinCapacity(head.DirectorySize);
int directoryRootPages = head.DirectoryRoot.Length;
int pagesPerPage = head.PageSize / 4;
int pagesToGo = pages;
for (int i = 0; i < directoryRootPages; i++)
{
int pagesInThisPage = pagesToGo <= pagesPerPage ? pagesToGo : pagesPerPage;
reader.Seek(head.DirectoryRoot[i], 0);
bits.Append(reader.Reader, pagesInThisPage * 4);
pagesToGo -= pagesInThisPage;
}
bits.Position = 0;
DataStream stream = new DataStream(head.DirectorySize, bits, pages);
bits.MinCapacity(head.DirectorySize);
stream.Read(reader, bits);
// 0..3 in directory pages
int count;
bits.ReadInt32(out count);
// 4..n
int[] sizes = new int[count];
bits.ReadInt32(sizes);
// n..m
_streams = new DataStream[count];
for (int i = 0; i < count; i++)
{
if (sizes[i] <= 0)
{
_streams[i] = new DataStream();
}
else
{
_streams[i] = new DataStream(
sizes[i],
bits,
reader.PagesFromSize(sizes[i]));
}
}
}
internal void Read(PdbStreamHelper reader, BitAccess bits)
{
bits.MinCapacity(_contentSize);
Read(reader, 0, bits.Buffer, 0, _contentSize);
}
