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Tried to implement full MSAT blindly, needs to be tested with a file with more than 109 SecIDs

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This commit is contained in:
Michael Becker 2014-10-22 23:29:35 -04:00
parent e2ce6e6f6b
commit d96f8461d0
1 changed files with 18 additions and 4 deletions
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22
CSharp/Plugins/UniversalEditor.Plugins.Microsoft/DataFormats/FileSystem/Microsoft/CompoundDocument/CompoundDocumentDataFormat.cs
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@ -20,6 +20,7 @@ namespace UniversalEditor.DataFormats.FileSystem.Microsoft.CompoundDocument
_dfr.ExportOptions.Add(new CustomOptionNumber("SectorSize", "&Sector size (in bytes):", 512, 128));
_dfr.ExportOptions.Add(new CustomOptionNumber("ShortSectorSize", "S&hort sector size (in bytes):", 64));
_dfr.ExportOptions.Add(new CustomOptionNumber("MinimumStandardStreamSize", "&Minimum standard stream size (in bytes):", 4096, 4096));
_dfr.Filters.Add("Microsoft Compound Document file system", new byte?[][] { new byte?[] { 0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1 } }, new string[] { "*.cbf" });
_dfr.Sources.Add("http://www.openoffice.org/sc/compdocfileformat.pdf");
}
return _dfr;
@ -125,13 +126,24 @@ namespace UniversalEditor.DataFormats.FileSystem.Microsoft.CompoundDocument
mvarMasterSectorAllocationTableFirstSectorID = reader.ReadInt32();
mvarMasterSectorAllocationTableSize = reader.ReadInt32();
#region Read Master Sector Allocation Table
// First part of the master sector allocation table, containing 109 SecIDs
int[] masterSectorAllocationTable = reader.ReadInt32Array(109);
if (mvarMasterSectorAllocationTableFirstSectorID != (int)CompoundDocumentKnownSectorID.EndOfChain)
// TODO: test this! when MSAT contains more than 109 SecIDs
int countForMSAT = (int)((double)mvarSectorSize / 4);
int nextSectorForMSAT = mvarMasterSectorAllocationTableFirstSectorID;
int nextPositionForMSAT = masterSectorAllocationTable.Length;
while (nextSectorForMSAT != (int)CompoundDocumentKnownSectorID.EndOfChain)
{
int nextSectorForMSAT = masterSectorAllocationTable[masterSectorAllocationTable.Length - 1];
Array.Resize(ref masterSectorAllocationTable, masterSectorAllocationTable.Length + countForMSAT);
int[] masterSectorAllocationTablePart = reader.ReadInt32Array(countForMSAT);
Array.Copy(masterSectorAllocationTablePart, 0, masterSectorAllocationTable, nextPositionForMSAT, masterSectorAllocationTablePart.Length);
nextSectorForMSAT = masterSectorAllocationTablePart[masterSectorAllocationTablePart.Length - 1];
}
#endregion
#region Read Sector Allocation Table
int pos = GetSectorPositionFromSectorID(masterSectorAllocationTable[0]);
reader.Accessor.Seek(pos, SeekOrigin.Begin);
int[] sectorAllocationTable = reader.ReadInt32Array((int)(mvarSectorSize / 4));
@ -152,7 +164,8 @@ namespace UniversalEditor.DataFormats.FileSystem.Microsoft.CompoundDocument
byte[] sectorData = reader.ReadBytes(mvarSectorSize);
Array.Copy(sectorData, 0, data, (i * mvarSectorSize), mvarSectorSize);
}
#endregion
#region Read Sector Directory Entries
Accessors.MemoryAccessor ma = new Accessors.MemoryAccessor(data);
reader = new Reader(ma);
@ -198,6 +211,7 @@ namespace UniversalEditor.DataFormats.FileSystem.Microsoft.CompoundDocument
file.DataRequest += file_DataRequest;
files.Add(file);
}
#endregion
}
private int GetSectorPositionFromSectorID(int sectorID)