|
public static ParseExtraField ( Stream extraFieldData ) : List |
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| extraFieldData | Stream | |
| return | List |
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public static List <ZipGenericExtraField> GetExtraFields(BinaryReader reader)
{
List <ZipGenericExtraField> zipGenericExtraFields;
reader.BaseStream.Seek((long)26, SeekOrigin.Current);
ushort num = reader.ReadUInt16();
ushort num1 = reader.ReadUInt16();
reader.BaseStream.Seek((long)num, SeekOrigin.Current);
using (Stream subReadStream = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)num1))
{
zipGenericExtraFields = ZipGenericExtraField.ParseExtraField(subReadStream);
}
Zip64ExtraField.RemoveZip64Blocks(zipGenericExtraFields);
return(zipGenericExtraFields);
}
public static List <ZipGenericExtraField> GetExtraFields(BinaryReader reader)
{
// assumes that TrySkipBlock has already been called, so we don't have to validate twice
List <ZipGenericExtraField> result;
const int OffsetToFilenameLength = 26; // from the point before the signature
reader.BaseStream.Seek(OffsetToFilenameLength, SeekOrigin.Current);
ushort filenameLength = reader.ReadUInt16();
ushort extraFieldLength = reader.ReadUInt16();
reader.BaseStream.Seek(filenameLength, SeekOrigin.Current);
using (Stream str = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, extraFieldLength))
{
result = ZipGenericExtraField.ParseExtraField(str);
}
Zip64ExtraField.RemoveZip64Blocks(result);
return(result);
}
// if saveExtraFieldsAndComments is false, FileComment and ExtraFields will be null
// in either case, the zip64 extra field info will be incorporated into other fields
public static bool TryReadBlock(BinaryReader reader, bool saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header)
{
header = new ZipCentralDirectoryFileHeader();
if (reader.ReadUInt32() != SignatureConstant)
{
return(false);
}
header.VersionMadeBySpecification = reader.ReadByte();
header.VersionMadeByCompatibility = reader.ReadByte();
header.VersionNeededToExtract = reader.ReadUInt16();
header.GeneralPurposeBitFlag = reader.ReadUInt16();
header.CompressionMethod = reader.ReadUInt16();
header.LastModified = reader.ReadUInt32();
header.Crc32 = reader.ReadUInt32();
uint compressedSizeSmall = reader.ReadUInt32();
uint uncompressedSizeSmall = reader.ReadUInt32();
header.FilenameLength = reader.ReadUInt16();
header.ExtraFieldLength = reader.ReadUInt16();
header.FileCommentLength = reader.ReadUInt16();
ushort diskNumberStartSmall = reader.ReadUInt16();
header.InternalFileAttributes = reader.ReadUInt16();
header.ExternalFileAttributes = reader.ReadUInt32();
uint relativeOffsetOfLocalHeaderSmall = reader.ReadUInt32();
header.Filename = reader.ReadBytes(header.FilenameLength);
bool uncompressedSizeInZip64 = uncompressedSizeSmall == ZipHelper.Mask32Bit;
bool compressedSizeInZip64 = compressedSizeSmall == ZipHelper.Mask32Bit;
bool relativeOffsetInZip64 = relativeOffsetOfLocalHeaderSmall == ZipHelper.Mask32Bit;
bool diskNumberStartInZip64 = diskNumberStartSmall == ZipHelper.Mask16Bit;
Zip64ExtraField zip64;
long endExtraFields = reader.BaseStream.Position + header.ExtraFieldLength;
using (Stream str = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, header.ExtraFieldLength))
{
if (saveExtraFieldsAndComments)
{
header.ExtraFields = ZipGenericExtraField.ParseExtraField(str);
zip64 = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields,
uncompressedSizeInZip64, compressedSizeInZip64,
relativeOffsetInZip64, diskNumberStartInZip64);
}
else
{
header.ExtraFields = null;
zip64 = Zip64ExtraField.GetJustZip64Block(str,
uncompressedSizeInZip64, compressedSizeInZip64,
relativeOffsetInZip64, diskNumberStartInZip64);
}
}
// There are zip files that have malformed ExtraField blocks in which GetJustZip64Block() silently bails out without reading all the way to the end
// of the ExtraField block. Thus we must force the stream's position to the proper place.
reader.BaseStream.AdvanceToPosition(endExtraFields);
if (saveExtraFieldsAndComments)
{
header.FileComment = reader.ReadBytes(header.FileCommentLength);
}
else
{
reader.BaseStream.Position += header.FileCommentLength;
header.FileComment = null;
}
header.UncompressedSize = zip64.UncompressedSize == null
? uncompressedSizeSmall
: zip64.UncompressedSize.Value;
header.CompressedSize = zip64.CompressedSize == null
? compressedSizeSmall
: zip64.CompressedSize.Value;
header.RelativeOffsetOfLocalHeader = zip64.LocalHeaderOffset == null
? relativeOffsetOfLocalHeaderSmall
: zip64.LocalHeaderOffset.Value;
header.DiskNumberStart = zip64.StartDiskNumber == null
? diskNumberStartSmall
: zip64.StartDiskNumber.Value;
return(true);
}
public static bool TryReadBlock(BinaryReader reader, bool saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header)
{
Zip64ExtraField justZip64Block;
long? uncompressedSize;
long value;
long num;
long value1;
header = new ZipCentralDirectoryFileHeader();
if (reader.ReadUInt32() != 33639248)
{
return(false);
}
header.VersionMadeBy = reader.ReadUInt16();
header.VersionNeededToExtract = reader.ReadUInt16();
header.GeneralPurposeBitFlag = reader.ReadUInt16();
header.CompressionMethod = reader.ReadUInt16();
header.LastModified = reader.ReadUInt32();
header.Crc32 = reader.ReadUInt32();
uint num1 = reader.ReadUInt32();
uint num2 = reader.ReadUInt32();
header.FilenameLength = reader.ReadUInt16();
header.ExtraFieldLength = reader.ReadUInt16();
header.FileCommentLength = reader.ReadUInt16();
ushort num3 = reader.ReadUInt16();
header.InternalFileAttributes = reader.ReadUInt16();
header.ExternalFileAttributes = reader.ReadUInt32();
uint num4 = reader.ReadUInt32();
header.Filename = reader.ReadBytes((int)header.FilenameLength);
bool flag = num2 == -1;
bool flag1 = num1 == -1;
bool flag2 = num4 == -1;
bool flag3 = num3 == 65535;
long position = (long)(reader.BaseStream.Position + (ulong)header.ExtraFieldLength);
using (Stream subReadStream = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)header.ExtraFieldLength))
{
if (!saveExtraFieldsAndComments)
{
header.ExtraFields = null;
justZip64Block = Zip64ExtraField.GetJustZip64Block(subReadStream, flag, flag1, flag2, flag3);
}
else
{
header.ExtraFields = ZipGenericExtraField.ParseExtraField(subReadStream);
justZip64Block = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields, flag, flag1, flag2, flag3);
}
}
reader.BaseStream.AdvanceToPosition(position);
if (!saveExtraFieldsAndComments)
{
Stream baseStream = reader.BaseStream;
baseStream.Position = (long)(baseStream.Position + (ulong)header.FileCommentLength);
header.FileComment = null;
}
else
{
header.FileComment = reader.ReadBytes((int)header.FileCommentLength);
}
if (!justZip64Block.UncompressedSize.HasValue)
{
value = (long)((ulong)num2);
}
else
{
uncompressedSize = justZip64Block.UncompressedSize;
value = uncompressedSize.Value;
}
header.UncompressedSize = value;
if (!justZip64Block.CompressedSize.HasValue)
{
num = (long)((ulong)num1);
}
else
{
uncompressedSize = justZip64Block.CompressedSize;
num = uncompressedSize.Value;
}
header.CompressedSize = num;
if (!justZip64Block.LocalHeaderOffset.HasValue)
{
value1 = (long)((ulong)num4);
}
else
{
uncompressedSize = justZip64Block.LocalHeaderOffset;
value1 = uncompressedSize.Value;
}
header.RelativeOffsetOfLocalHeader = value1;
header.DiskNumberStart = (!justZip64Block.StartDiskNumber.HasValue ? (int)num3 : justZip64Block.StartDiskNumber.Value);
return(true);
}
//if saveExtraFieldsAndComments is false, FileComment and ExtraFields will be null
//in either case, the zip64 extra field info will be incorporated into other fields
static public Boolean TryReadBlock(BinaryReader reader, Boolean saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header)
{
header = new ZipCentralDirectoryFileHeader();
if (reader.ReadUInt32() != SignatureConstant)
{
return(false);
}
header.VersionMadeBy = reader.ReadUInt16();
header.VersionNeededToExtract = reader.ReadUInt16();
header.GeneralPurposeBitFlag = reader.ReadUInt16();
header.CompressionMethod = reader.ReadUInt16();
header.LastModified = reader.ReadUInt32();
header.Crc32 = reader.ReadUInt32();
UInt32 compressedSizeSmall = reader.ReadUInt32();
UInt32 uncompressedSizeSmall = reader.ReadUInt32();
header.FilenameLength = reader.ReadUInt16();
header.ExtraFieldLength = reader.ReadUInt16();
header.FileCommentLength = reader.ReadUInt16();
UInt16 diskNumberStartSmall = reader.ReadUInt16();
header.InternalFileAttributes = reader.ReadUInt16();
header.ExternalFileAttributes = reader.ReadUInt32();
UInt32 relativeOffsetOfLocalHeaderSmall = reader.ReadUInt32();
header.Filename = reader.ReadBytes(header.FilenameLength);
Boolean uncompressedSizeInZip64 = uncompressedSizeSmall == ZipHelper.Mask32Bit;
Boolean compressedSizeInZip64 = compressedSizeSmall == ZipHelper.Mask32Bit;
Boolean relativeOffsetInZip64 = relativeOffsetOfLocalHeaderSmall == ZipHelper.Mask32Bit;
Boolean diskNumberStartInZip64 = diskNumberStartSmall == ZipHelper.Mask16Bit;
Zip64ExtraField zip64;
using (Stream str = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, header.ExtraFieldLength))
{
if (saveExtraFieldsAndComments)
{
header.ExtraFields = ZipGenericExtraField.ParseExtraField(str);
zip64 = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields,
uncompressedSizeInZip64, compressedSizeInZip64,
relativeOffsetInZip64, diskNumberStartInZip64);
}
else
{
header.ExtraFields = null;
zip64 = Zip64ExtraField.GetJustZip64Block(str,
uncompressedSizeInZip64, compressedSizeInZip64,
relativeOffsetInZip64, diskNumberStartInZip64);
}
}
if (saveExtraFieldsAndComments)
{
header.FileComment = reader.ReadBytes(header.FileCommentLength);
}
else
{
reader.BaseStream.Position += header.FileCommentLength;
header.FileComment = null;
}
header.UncompressedSize = zip64.UncompressedSize == null
? uncompressedSizeSmall
: zip64.UncompressedSize.Value;
header.CompressedSize = zip64.CompressedSize == null
? compressedSizeSmall
: zip64.CompressedSize.Value;
header.RelativeOffsetOfLocalHeader = zip64.LocalHeaderOffset == null
? relativeOffsetOfLocalHeaderSmall
: zip64.LocalHeaderOffset.Value;
header.DiskNumberStart = zip64.StartDiskNumber == null
? diskNumberStartSmall
: zip64.StartDiskNumber.Value;
return(true);
}