public void TestFetchBlocks()
{
// strategy:
//
// 1. Set up a single BAT block from which to construct a
// BAT. create nonsense blocks in the raw data block ArrayList
// corresponding to the indices in the BAT block.
// 2. The indices will include very short documents (0 and 1
// block in Length), longer documents, and some screwed up
// documents (one with a loop, one that will peek into
// another document's data, one that includes an unused
// document, one that includes a reserved (BAT) block, one
// that includes a reserved (XBAT) block, and one that
// points off into space somewhere
LocalRawDataBlockList list = new LocalRawDataBlockList();
byte[] data = new byte[512];
int offset = 0;
LittleEndian.PutInt(data, offset, -3); // for the BAT block itself
offset += LittleEndianConsts.INT_SIZE;
// document 1: Is at end of file alReady; start block = -2
// document 2: has only one block; start block = 1
LittleEndian.PutInt(data, offset, -2);
offset += LittleEndianConsts.INT_SIZE;
// document 3: has a loop in it; start block = 2
LittleEndian.PutInt(data, offset, 2);
offset += LittleEndianConsts.INT_SIZE;
// document 4: peeks into document 2's data; start block = 3
LittleEndian.PutInt(data, offset, 4);
offset += LittleEndianConsts.INT_SIZE;
LittleEndian.PutInt(data, offset, 1);
offset += LittleEndianConsts.INT_SIZE;
// document 5: includes an unused block; start block = 5
LittleEndian.PutInt(data, offset, 6);
offset += LittleEndianConsts.INT_SIZE;
LittleEndian.PutInt(data, offset, -1);
offset += LittleEndianConsts.INT_SIZE;
// document 6: includes a BAT block; start block = 7
LittleEndian.PutInt(data, offset, 8);
offset += LittleEndianConsts.INT_SIZE;
LittleEndian.PutInt(data, offset, 0);
offset += LittleEndianConsts.INT_SIZE;
// document 7: includes an XBAT block; start block = 9
LittleEndian.PutInt(data, offset, 10);
offset += LittleEndianConsts.INT_SIZE;
LittleEndian.PutInt(data, offset, -4);
offset += LittleEndianConsts.INT_SIZE;
// document 8: goes off into space; start block = 11;
LittleEndian.PutInt(data, offset, 1000);
offset += LittleEndianConsts.INT_SIZE;
// document 9: no screw ups; start block = 12;
int index = 13;
for (; offset < 508; offset += LittleEndianConsts.INT_SIZE)
{
LittleEndian.PutInt(data, offset, index++);
}
LittleEndian.PutInt(data, offset, -2);
list.Add(new RawDataBlock(new MemoryStream(data)));
list.Fill(1);
int[] blocks = { 0 };
BlockAllocationTableReader table =
new BlockAllocationTableReader(POIFSConstants.SMALLER_BIG_BLOCK_SIZE_DETAILS, 1, blocks, 0, -2, list);
int[] start_blocks = { -2, 1, 2, 3, 5, 7, 9, 11, 12};
int[] expected_Length = { 0, 1, -1, -1, -1, -1, -1, -1, 116 };
for (int j = 0; j < start_blocks.Length; j++)
{
try
{
ListManagedBlock[] dataBlocks =
table.FetchBlocks(start_blocks[j],-1, list);
if (expected_Length[j] == -1)
{
Assert.Fail("document " + j + " should have failed");
}
else
{
Assert.AreEqual(expected_Length[j], dataBlocks.Length);
}
}
catch (IOException)
{
if (expected_Length[j] == -1)
{
// no problem, we expected a failure here
}
else
{
throw;
}
}
}
}
