/// <summary>
/// This function is called from the Parse routine. The purpose of this exercise , is to figure out the escape
/// values in the regular 32 bit EOCD. We shouldn't be using values from the 64 bit structure if it wasn't
/// escaped in the 32 bit structure.
/// </summary>
private void OverrideValuesBasedOnEndOfCentralDirectory(ZipIOEndOfCentralDirectoryBlock zipIoEocd)
{
// 16 bit numbers
if (zipIoEocd.NumberOfThisDisk < UInt16.MaxValue)
{
_numberOfThisDisk = zipIoEocd.NumberOfThisDisk;
}
if (zipIoEocd.NumberOfTheDiskWithTheStartOfTheCentralDirectory < UInt16.MaxValue)
{
_numberOfTheDiskWithTheStartOfTheCentralDirectory = zipIoEocd.NumberOfTheDiskWithTheStartOfTheCentralDirectory;
}
if (zipIoEocd.TotalNumberOfEntriesInTheCentralDirectoryOnThisDisk < UInt16.MaxValue)
{
_totalNumberOfEntriesInTheCentralDirectoryOnThisDisk = zipIoEocd.TotalNumberOfEntriesInTheCentralDirectoryOnThisDisk;
}
if (zipIoEocd.TotalNumberOfEntriesInTheCentralDirectory < UInt16.MaxValue)
{
_totalNumberOfEntriesInTheCentralDirectory = zipIoEocd.TotalNumberOfEntriesInTheCentralDirectory;
}
// 32 bit numbers
if (zipIoEocd.SizeOfTheCentralDirectory < UInt32.MaxValue)
{
_sizeOfTheCentralDirectory = zipIoEocd.SizeOfTheCentralDirectory;
}
if (zipIoEocd.OffsetOfStartOfCentralDirectory < UInt32.MaxValue)
{
_offsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber = zipIoEocd.OffsetOfStartOfCentralDirectory;
}
}
/// <summary>
/// This function is called from the Create New routine. The purpose of this exercise , is to copy data from 32 bit EOCD into this record,
/// for scenarios when ZIP64 EOCD wasn't parsed from a file, but was just made up.
/// This is done so that Central Dir parsing code can ask the ZIP64 EOCD for this data, and regardless of whether it is real zip 64 file or
/// not a zip 64 file it will get the right CD offset , size and so on
/// </summary>
private void InitializeFromEndOfCentralDirectory(ZipIOEndOfCentralDirectoryBlock zipIoEocd)
{
_numberOfThisDisk = zipIoEocd.NumberOfThisDisk;
_numberOfTheDiskWithTheStartOfTheCentralDirectory = zipIoEocd.NumberOfTheDiskWithTheStartOfTheCentralDirectory;
_totalNumberOfEntriesInTheCentralDirectoryOnThisDisk = zipIoEocd.TotalNumberOfEntriesInTheCentralDirectoryOnThisDisk;
_totalNumberOfEntriesInTheCentralDirectory = zipIoEocd.TotalNumberOfEntriesInTheCentralDirectory;
_sizeOfTheCentralDirectory = zipIoEocd.SizeOfTheCentralDirectory;
_offsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber = zipIoEocd.OffsetOfStartOfCentralDirectory;
}
internal static ZipIOEndOfCentralDirectoryBlock CreateNew(ZipIOBlockManager blockManager, long offset)
{
ZipIOEndOfCentralDirectoryBlock block = new ZipIOEndOfCentralDirectoryBlock(blockManager);
block._offset = offset;
block._dirtyFlag = true;
return(block);
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
internal static ZipIOEndOfCentralDirectoryBlock SeekableLoad(ZipIOBlockManager blockManager)
{
// perform custom serach for record
long blockPosition = FindPosition(blockManager.Stream);
blockManager.Stream.Seek(blockPosition, SeekOrigin.Begin);
ZipIOEndOfCentralDirectoryBlock block = new ZipIOEndOfCentralDirectoryBlock(blockManager);
block.ParseRecord(blockManager.BinaryReader, blockPosition);
return(block);
}
/// <summary>
/// This function is called from the Parse routine. The purpose of this exercise , is to figure out the escape
/// values in the regular 32 bit EOCD. We shouldn't be using values from the 64 bit structure if it wasn't
/// escaped in the 32 bit structure.
/// </summary>
private void OverrideValuesBasedOnEndOfCentralDirectory(ZipIOEndOfCentralDirectoryBlock zipIoEocd)
{
// 16 bit numbers
if (zipIoEocd.NumberOfThisDisk < UInt16.MaxValue)
{_numberOfThisDisk = zipIoEocd.NumberOfThisDisk;}
if (zipIoEocd.NumberOfTheDiskWithTheStartOfTheCentralDirectory < UInt16.MaxValue)
{_numberOfTheDiskWithTheStartOfTheCentralDirectory = zipIoEocd.NumberOfTheDiskWithTheStartOfTheCentralDirectory;}
if (zipIoEocd.TotalNumberOfEntriesInTheCentralDirectoryOnThisDisk < UInt16.MaxValue)
{_totalNumberOfEntriesInTheCentralDirectoryOnThisDisk = zipIoEocd.TotalNumberOfEntriesInTheCentralDirectoryOnThisDisk;}
if (zipIoEocd.TotalNumberOfEntriesInTheCentralDirectory < UInt16.MaxValue)
{_totalNumberOfEntriesInTheCentralDirectory = zipIoEocd.TotalNumberOfEntriesInTheCentralDirectory;}
// 32 bit numbers
if (zipIoEocd.SizeOfTheCentralDirectory < UInt32.MaxValue)
{_sizeOfTheCentralDirectory = zipIoEocd.SizeOfTheCentralDirectory;}
if (zipIoEocd.OffsetOfStartOfCentralDirectory < UInt32.MaxValue)
{_offsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber = zipIoEocd.OffsetOfStartOfCentralDirectory;}
}
/// <summary>
/// This function is called from the Create New routine. The purpose of this exercise , is to copy data from 32 bit EOCD into this record,
/// for scenarios when ZIP64 EOCD wasn't parsed from a file, but was just made up.
/// This is done so that Central Dir parsing code can ask the ZIP64 EOCD for this data, and regardless of whether it is real zip 64 file or
/// not a zip 64 file it will get the right CD offset , size and so on
/// </summary>
private void InitializeFromEndOfCentralDirectory(ZipIOEndOfCentralDirectoryBlock zipIoEocd)
{
_numberOfThisDisk = zipIoEocd.NumberOfThisDisk;
_numberOfTheDiskWithTheStartOfTheCentralDirectory = zipIoEocd.NumberOfTheDiskWithTheStartOfTheCentralDirectory;
_totalNumberOfEntriesInTheCentralDirectoryOnThisDisk = zipIoEocd.TotalNumberOfEntriesInTheCentralDirectoryOnThisDisk;
_totalNumberOfEntriesInTheCentralDirectory = zipIoEocd.TotalNumberOfEntriesInTheCentralDirectory;
_sizeOfTheCentralDirectory = zipIoEocd.SizeOfTheCentralDirectory;
_offsetOfStartOfCentralDirectoryWithRespectToTheStartingDiskNumber = zipIoEocd.OffsetOfStartOfCentralDirectory;
}
internal static ZipIOEndOfCentralDirectoryBlock CreateNew(ZipIOBlockManager blockManager, long offset)
{
ZipIOEndOfCentralDirectoryBlock block = new ZipIOEndOfCentralDirectoryBlock(blockManager);
block._offset = offset;
block._dirtyFlag = true;
return block;
}
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
internal static ZipIOEndOfCentralDirectoryBlock SeekableLoad (ZipIOBlockManager blockManager)
{
// perform custom serach for record
long blockPosition = FindPosition(blockManager.Stream);
blockManager.Stream.Seek(blockPosition, SeekOrigin.Begin);
ZipIOEndOfCentralDirectoryBlock block = new ZipIOEndOfCentralDirectoryBlock(blockManager);
block.ParseRecord(blockManager.BinaryReader, blockPosition);
return block;
}
