/// <summary>
/// Create an array of XBATBlocks from an array of int block
/// allocation table entries
/// </summary>
/// <param name="entries">the array of int entries</param>
/// <param name="startBlock">the start block of the array of XBAT blocks</param>
/// <returns>the newly created array of BATBlocks</returns>
public static BATBlock[] CreateXBATBlocks(POIFSBigBlockSize bigBlockSize, int[] entries,
int startBlock)
{
int block_count =
CalculateXBATStorageRequirements(entries.Length);
BATBlock[] blocks = new BATBlock[block_count];
int index = 0;
int remaining = entries.Length;
if (block_count != 0)
{
for (int j = 0; j < entries.Length; j += _entries_per_xbat_block)
{
blocks[index++] =
new BATBlock(bigBlockSize, entries, j,
(remaining > _entries_per_xbat_block)
? j + _entries_per_xbat_block
: entries.Length);
remaining -= _entries_per_xbat_block;
}
for (index = 0; index < blocks.Length - 1; index++)
{
blocks[index].SetXBATChain(bigBlockSize, startBlock + index + 1);
}
blocks[index].SetXBATChain(bigBlockSize, POIFSConstants.END_OF_CHAIN);
}
return(blocks);
}
/// <summary>
/// Create the BATBlocks we need
/// </summary>
/// <returns>start block index of BAT blocks</returns>
public int CreateBlocks()
{
int xbat_blocks = 0;
int bat_blocks = 0;
while (true)
{
int calculated_bat_blocks =
BATBlock.CalculateStorageRequirements(_bigBlockSize,
bat_blocks
+ xbat_blocks
+ _entries.Count);
int calculated_xbat_blocks =
HeaderBlockWriter.CalculateXBATStorageRequirements(_bigBlockSize, calculated_bat_blocks);
if ((bat_blocks == calculated_bat_blocks) &&
(xbat_blocks == calculated_xbat_blocks))
{
// stable ... we're OK
break;
}
else
{
bat_blocks = calculated_bat_blocks;
xbat_blocks = calculated_xbat_blocks;
}
}
int startBlock = AllocateSpace(bat_blocks);
AllocateSpace(xbat_blocks);
SimpleCreateBlocks();
return(startBlock);
}
///**
// * Creates a single BATBlock, with all the values set to empty.
// */
public static BATBlock CreateEmptyBATBlock(POIFSBigBlockSize bigBlockSize, bool isXBAT)
{
BATBlock block = new BATBlock(bigBlockSize);
if (isXBAT)
{
block.SetXBATChain(bigBlockSize, POIFSConstants.END_OF_CHAIN);
}
return(block);
}
/**
* Create a single BATBlock from the byte buffer, which must hold at least
* one big block of data to be read.
*/
public static BATBlock CreateBATBlock(POIFSBigBlockSize bigBlockSize, BinaryReader data)
{
// Create an empty block
BATBlock block = new BATBlock(bigBlockSize);
// Fill it
byte[] buffer = new byte[LittleEndianConsts.INT_SIZE];
for (int i = 0; i < block._values.Length; i++)
{
data.Read(buffer, 0, buffer.Length);
block._values[i] = LittleEndian.GetInt(buffer);
}
block.RecomputeFree();
// All done
return(block);
}
/// <summary>
/// Create an array of BATBlocks from an array of int block
/// allocation table entries
/// </summary>
/// <param name="entries">the array of int entries</param>
/// <returns>the newly created array of BATBlocks</returns>
public static BATBlock[] CreateBATBlocks(POIFSBigBlockSize bigBlockSize, int[] entries)
{
int block_count = CalculateStorageRequirements(entries.Length);
BATBlock[] blocks = new BATBlock[block_count];
int index = 0;
int remaining = entries.Length;
for (int j = 0; j < entries.Length; j += _entries_per_block)
{
blocks[index++] = new BATBlock(bigBlockSize, entries, j,
(remaining > _entries_per_block)
? j + _entries_per_block
: entries.Length);
remaining -= _entries_per_block;
}
return(blocks);
}
/// <summary>
/// Set BAT block parameters. Assumes that all BAT blocks are
/// contiguous. Will construct XBAT blocks if necessary and return
/// the array of newly constructed XBAT blocks.
/// </summary>
/// <param name="blockCount">count of BAT blocks</param>
/// <param name="startBlock">index of first BAT block</param>
/// <returns>array of XBAT blocks; may be zero Length, will not be
/// null</returns>
public BATBlock[] SetBATBlocks(int blockCount, int startBlock)
{
BATBlock[] rvalue;
POIFSBigBlockSize bigBlockSize = _header_block.BigBlockSize;
_header_block.BATCount = blockCount;
int limit = Math.Min(blockCount, _max_bats_in_header);
int[] bat_blocks = new int[limit];
for (int j = 0; j < limit; j++)
{
bat_blocks[j] = startBlock + j;
}
_header_block.BATArray = bat_blocks;
if (blockCount > _max_bats_in_header)
{
int excess_blocks = blockCount - _max_bats_in_header;
int[] excess_block_array = new int[excess_blocks];
for (int j = 0; j < excess_blocks; j++)
{
excess_block_array[j] = startBlock + j + _max_bats_in_header;
}
rvalue = BATBlock.CreateXBATBlocks(bigBlockSize, excess_block_array,
startBlock + blockCount);
_header_block.XBATStart = startBlock + blockCount;
}
else
{
rvalue = BATBlock.CreateXBATBlocks(bigBlockSize, new int[0], 0);
_header_block.XBATStart = POIFSConstants.END_OF_CHAIN;
}
_header_block.XBATCount = rvalue.Length;
return(rvalue);
}
//public static BATBlock CreateBATBlock(POIFSBigBlockSize bigBlockSize, byte[] data)
public static BATBlock CreateBATBlock(POIFSBigBlockSize bigBlockSize, ByteBuffer data)
{
// Create an empty block
BATBlock block = new BATBlock(bigBlockSize);
// Fill it
byte[] buffer = new byte[LittleEndianConsts.INT_SIZE];
//int index = 0;
for (int i = 0; i < block._values.Length; i++)
{
//data.Read(buffer, 0, buffer.Length);
//for (int j = 0; j < buffer.Length; j++, index++)
// buffer[j] = data[index];
data.Read(buffer);
block._values[i] = LittleEndian.GetInt(buffer);
}
block.RecomputeFree();
// All done
return(block);
}
//public static void WriteBlock(BATBlock bat, byte[] block)
public static void WriteBlock(BATBlock bat, ByteBuffer block)
{
bat.WriteData(block);
}
/// <summary>
/// create the BATBlocks
/// </summary>
internal void SimpleCreateBlocks()
{
_blocks = BATBlock.CreateBATBlocks(_bigBlockSize, _entries.ToArray());
}
public BATBlockAndIndex(int index, BATBlock block)
{
this.index = index;
this.block = block;
}
/// <summary>
/// For a given number of BAT blocks, calculate how many XBAT
/// blocks will be needed
/// </summary>
/// <param name="blockCount">number of BAT blocks</param>
/// <returns>number of XBAT blocks needed</returns>
public static int CalculateXBATStorageRequirements(POIFSBigBlockSize bigBlockSize, int blockCount)
{
return((blockCount > _max_bats_in_header)
? BATBlock.CalculateXBATStorageRequirements(bigBlockSize, blockCount - _max_bats_in_header) : 0);
}