public void UpdateReferences(bool closingFlag)
{
// we just need to ask Block Manager for the new Values for each header
// there are 2 distinct cases here
// 1. local file data is mapped . loaded and might have been changed in size and position
// 2. local file data is not loaded and might have been changed only in position (not in size)
foreach (IZipIOBlock block in _blockManager)
{
ZipIOLocalFileBlock localFileBlock = block as ZipIOLocalFileBlock;
ZipIORawDataFileBlock rawDataFileBlock = block as ZipIORawDataFileBlock;
if (localFileBlock != null)
{
// this is case 1 data is mapped and loaded, so we only need to find the matching
// Centraldirectory record and update it
Debug.Assert(CentralDirectoryDictionary.Contains(localFileBlock.FileName));
ZipIOCentralDirectoryFileHeader centralDirFileHeader =
(ZipIOCentralDirectoryFileHeader)CentralDirectoryDictionary[localFileBlock.FileName];
if (centralDirFileHeader.UpdateIfNeeded(localFileBlock))
{
//update was required let's mark ourselves as dirty
_dirtyFlag = true;
}
}
//check whether we deal with raw data block and it was moved
else if (rawDataFileBlock != null)
{
long diskImageShift = rawDataFileBlock.DiskImageShift;
if (diskImageShift != 0)
{
//this is case #2 data isn't loaded based on the shift in the RawData Block
// we need to move all overlapping central directory references
foreach (ZipIOCentralDirectoryFileHeader centralDirFileHeader in CentralDirectoryDictionary.Values)
{
// check whether central dir header points into the region of a moved RawDataBlock
if (rawDataFileBlock.DiskImageContains(centralDirFileHeader.OffsetOfLocalHeader))
{
centralDirFileHeader.MoveReference(diskImageShift);
_dirtyFlag = true;
}
}
}
}
}
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
internal static ZipIORawDataFileBlock Assign(ZipIOBlockManager blockManager, long offset, long size)
{
if (size <= 0)
{
throw new ArgumentOutOfRangeException("size");
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset");
}
ZipIORawDataFileBlock block = new ZipIORawDataFileBlock(blockManager);
block._persistedOffset = offset;
block._offset = offset;
block._size = size;
return(block);
}
internal void SplitIntoPrefixSuffix(IZipIOBlock block,
out ZipIORawDataFileBlock prefixBlock, out ZipIORawDataFileBlock suffixBlock)
{
// assert that current's block cache isn't loaded, if it is
// we probably missed an opportunity to used this cache in order to parse the new block
// and it might be based on the overriden data on disk
// This block can only be in cached state as a part of single BlockManager.Save execution.
// It can NOT be in cached state prior to BlockManager.Save function entry or after
// BlockManager.Save execution completed
Debug.Assert(_cachePrefixStream == null);
// Assert that block is containe inside the current raw block
Debug.Assert(DiskImageContains(block));
checked
{
prefixBlock = null;
suffixBlock = null;
if (block.Offset > _persistedOffset)
{
// we have a new non empty prefix;
long newBlockOffset = _persistedOffset;
long newBlockSize = block.Offset - _persistedOffset;
prefixBlock = Assign(_blockManager, newBlockOffset, newBlockSize);
}
if (block.Offset + block.Size < _persistedOffset + _size)
{
// we have a new non empty suffix;
long newBlockOffset = block.Offset + block.Size;
long newBlockSize = _persistedOffset + _size - newBlockOffset;
suffixBlock = Assign(_blockManager, newBlockOffset, newBlockSize);
}
}
}
internal void SplitIntoPrefixSuffix(IZipIOBlock block,
out ZipIORawDataFileBlock prefixBlock, out ZipIORawDataFileBlock suffixBlock)
{
// assert that current's block cache isn't loaded, if it is
// we probably missed an opportunity to used this cache in order to parse the new block
// and it might be based on the overriden data on disk
// This block can only be in cached state as a part of single BlockManager.Save execution.
// It can NOT be in cached state prior to BlockManager.Save function entry or after
// BlockManager.Save execution completed
Debug.Assert(_cachePrefixStream == null);
// Assert that block is containe inside the current raw block
Debug.Assert(DiskImageContains(block));
checked
{
prefixBlock = null;
suffixBlock = null;
if (block.Offset > _persistedOffset)
{
// we have a new non empty prefix;
long newBlockOffset = _persistedOffset;
long newBlockSize = block.Offset - _persistedOffset;
prefixBlock = Assign(_blockManager, newBlockOffset , newBlockSize);
}
if (block.Offset + block.Size < _persistedOffset + _size)
{
// we have a new non empty suffix;
long newBlockOffset = block.Offset + block.Size;
long newBlockSize = _persistedOffset + _size - newBlockOffset;
suffixBlock = Assign(_blockManager, newBlockOffset, newBlockSize);
}
}
}
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
internal static ZipIORawDataFileBlock Assign(ZipIOBlockManager blockManager, long offset, long size)
{
if (size <= 0)
{
throw new ArgumentOutOfRangeException ("size");
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException ("offset");
}
ZipIORawDataFileBlock block = new ZipIORawDataFileBlock(blockManager);
block._persistedOffset = offset;
block._offset = offset;
block._size = size;
return block;
}