internal static ZipIOLocalFileHeader ParseRecord(BinaryReader reader, Encoding encoding)
{
ZipIOLocalFileHeader header = new ZipIOLocalFileHeader();
header._signature = reader.ReadUInt32();
header._versionNeededToExtract = reader.ReadUInt16();
header._generalPurposeBitFlag = reader.ReadUInt16();
header._compressionMethod = reader.ReadUInt16();
header._lastModFileDateTime = reader.ReadUInt32();
header._crc32 = reader.ReadUInt32();
header._compressedSize = reader.ReadUInt32();
header._uncompressedSize = reader.ReadUInt32();
header._fileNameLength = reader.ReadUInt16();
header._extraFieldLength = reader.ReadUInt16();
header._fileName = reader.ReadBytes(header._fileNameLength);
ZipIOZip64ExtraFieldUsage none = ZipIOZip64ExtraFieldUsage.None;
if (header._versionNeededToExtract >= 0x2d)
{
if (header._compressedSize == uint.MaxValue)
{
none |= ZipIOZip64ExtraFieldUsage.CompressedSize;
}
if (header._uncompressedSize == uint.MaxValue)
{
none |= ZipIOZip64ExtraFieldUsage.UncompressedSize;
}
}
header._extraField = ZipIOExtraField.ParseRecord(reader, none, header._extraFieldLength);
header._stringFileName = ZipIOBlockManager.ValidateNormalizeFileName(encoding.GetString(header._fileName));
header.Validate();
return(header);
}
internal static ZipIOCentralDirectoryFileHeader ParseRecord(BinaryReader reader, Encoding encoding)
{
ZipIOCentralDirectoryFileHeader header = new ZipIOCentralDirectoryFileHeader(encoding);
header._signature = reader.ReadUInt32();
header._versionMadeBy = reader.ReadUInt16();
header._versionNeededToExtract = reader.ReadUInt16();
header._generalPurposeBitFlag = reader.ReadUInt16();
header._compressionMethod = reader.ReadUInt16();
header._lastModFileDateTime = reader.ReadUInt32();
header._crc32 = reader.ReadUInt32();
header._compressedSize = reader.ReadUInt32();
header._uncompressedSize = reader.ReadUInt32();
header._fileNameLength = reader.ReadUInt16();
header._extraFieldLength = reader.ReadUInt16();
header._fileCommentLength = reader.ReadUInt16();
header._diskNumberStart = reader.ReadUInt16();
header._internalFileAttributes = reader.ReadUInt16();
header._externalFileAttributes = reader.ReadUInt32();
header._relativeOffsetOfLocalHeader = reader.ReadUInt32();
header._fileName = reader.ReadBytes(header._fileNameLength);
// check for the ZIP 64 version and escaped values
ZipIOZip64ExtraFieldUsage zip64extraFieldUsage = ZipIOZip64ExtraFieldUsage.None;
if (header._versionNeededToExtract >= (ushort)ZipIOVersionNeededToExtract.Zip64FileFormat)
{
if (header._compressedSize == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.CompressedSize;
}
if (header._uncompressedSize == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.UncompressedSize;
}
if (header._relativeOffsetOfLocalHeader == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader;
}
if (header._diskNumberStart == UInt16.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.DiskNumber;
}
}
// if the ZIP 64 record is missing the zip64extraFieldUsage value will be ignored
header._extraField = ZipIOExtraField.ParseRecord(reader,
zip64extraFieldUsage,
header._extraFieldLength);
header._fileComment = reader.ReadBytes(header._fileCommentLength);
//populate frequently used field with user friendly data representations
header._stringFileName = ZipIOBlockManager.ValidateNormalizeFileName(encoding.GetString(header._fileName));
header.Validate();
return(header);
}
internal static ZipIOExtraField ParseRecord(BinaryReader reader, ZipIOZip64ExtraFieldUsage zip64extraFieldUsage, ushort expectedExtraFieldSize)
{
if (expectedExtraFieldSize == 0)
{
if (zip64extraFieldUsage != ZipIOZip64ExtraFieldUsage.None)
{
throw new FileFormatException(SR.Get("CorruptedData"));
}
return(CreateNew(false));
}
ZipIOExtraField field = new ZipIOExtraField();
while (expectedExtraFieldSize > 0)
{
if (expectedExtraFieldSize < ZipIOExtraFieldElement.MinimumSize)
{
throw new FileFormatException(SR.Get("CorruptedData"));
}
ZipIOExtraFieldElement element = ZipIOExtraFieldElement.Parse(reader, zip64extraFieldUsage);
ZipIOExtraFieldZip64Element element3 = element as ZipIOExtraFieldZip64Element;
ZipIOExtraFieldPaddingElement element2 = element as ZipIOExtraFieldPaddingElement;
if (element3 != null)
{
if (field._zip64Element != null)
{
throw new FileFormatException(SR.Get("CorruptedData"));
}
field._zip64Element = element3;
}
else if (element2 != null)
{
if (field._paddingElement != null)
{
throw new FileFormatException(SR.Get("CorruptedData"));
}
field._paddingElement = element2;
}
else
{
if (field._extraFieldElements == null)
{
field._extraFieldElements = new ArrayList(3);
}
field._extraFieldElements.Add(element);
}
expectedExtraFieldSize = (ushort)(expectedExtraFieldSize - element.Size);
}
if (expectedExtraFieldSize != 0)
{
throw new FileFormatException(SR.Get("CorruptedData"));
}
if (field._zip64Element == null)
{
field._zip64Element = ZipIOExtraFieldZip64Element.CreateNew();
}
return(field);
}
internal static ZipIOExtraFieldElement Parse(BinaryReader reader, ZipIOZip64ExtraFieldUsage zip64extraFieldUsage)
{
// we can safely parse the Id and Size here
// since the minimum size is checked from the caller (ZipIoExtraField)
UInt16 id = reader.ReadUInt16();
UInt16 size = reader.ReadUInt16();
ZipIOExtraFieldElement newElement;
if (id == ZipIOExtraFieldZip64Element.ConstantFieldId) // Found Zip64 Extra Field element
{
newElement = new ZipIOExtraFieldZip64Element();
((ZipIOExtraFieldZip64Element)newElement).Zip64ExtraFieldUsage = zip64extraFieldUsage;
}
else if (id == ZipIOExtraFieldPaddingElement.ConstantFieldId) // Found potential Padding Extra Field element
{
// Even if the id matches Padding Extra Element id, we cannot be sure if it is Microsoft defined one
// until its signature is verified
// This extra field matches Padding Extra Element id, but it is not big enough to be ours
if (size < ZipIOExtraFieldPaddingElement.MinimumFieldDataSize)
{
// Treat it as an unknown Extra Field element
newElement = new ZipIOExtraFieldElement(id);
}
else
{
// Sniff bytes to check it it matches our Padding extra field signature
byte[] sniffedBytes = reader.ReadBytes(ZipIOExtraFieldPaddingElement.SignatureSize);
if (ZipIOExtraFieldPaddingElement.MatchesPaddingSignature(sniffedBytes))
{
// Signature matches the Padding Extra Field signature
newElement = new ZipIOExtraFieldPaddingElement();
}
else
{
// Signature doesn't match; treat it a an unknown Extra Field element
newElement = new ZipIOExtraFieldElement(id, sniffedBytes);
}
}
}
else
{
newElement = new ZipIOExtraFieldElement(id);
}
// Parse the data field of the Extra Field element
newElement.ParseDataField(reader, size);
return(newElement);
}
internal static ZipIOExtraFieldElement Parse(BinaryReader reader, ZipIOZip64ExtraFieldUsage zip64extraFieldUsage)
{
// we can safely parse the Id and Size here
// since the minimum size is checked from the caller (ZipIoExtraField)
UInt16 id = reader.ReadUInt16();
UInt16 size = reader.ReadUInt16();
ZipIOExtraFieldElement newElement;
if (id == ZipIOExtraFieldZip64Element.ConstantFieldId) // Found Zip64 Extra Field element
{
newElement = new ZipIOExtraFieldZip64Element();
((ZipIOExtraFieldZip64Element) newElement).Zip64ExtraFieldUsage = zip64extraFieldUsage;
}
else if (id == ZipIOExtraFieldPaddingElement.ConstantFieldId) // Found potential Padding Extra Field element
{
// Even if the id matches Padding Extra Element id, we cannot be sure if it is Microsoft defined one
// until its signature is verified
// This extra field matches Padding Extra Element id, but it is not big enough to be ours
if (size < ZipIOExtraFieldPaddingElement.MinimumFieldDataSize)
{
// Treat it as an unknown Extra Field element
newElement = new ZipIOExtraFieldElement(id);
}
else
{
// Sniff bytes to check it it matches our Padding extra field signature
byte[] sniffedBytes = reader.ReadBytes(ZipIOExtraFieldPaddingElement.SignatureSize);
if (ZipIOExtraFieldPaddingElement.MatchesPaddingSignature(sniffedBytes))
{
// Signature matches the Padding Extra Field signature
newElement = new ZipIOExtraFieldPaddingElement();
}
else
{
// Signature doesn't match; treat it a an unknown Extra Field element
newElement = new ZipIOExtraFieldElement(id, sniffedBytes);
}
}
}
else
{
newElement = new ZipIOExtraFieldElement(id);
}
// Parse the data field of the Extra Field element
newElement.ParseDataField(reader, size);
return newElement;
}
internal static ZipIOCentralDirectoryFileHeader ParseRecord(BinaryReader reader, Encoding encoding)
{
ZipIOCentralDirectoryFileHeader header = new ZipIOCentralDirectoryFileHeader(encoding);
header._signature = reader.ReadUInt32();
header._versionMadeBy = reader.ReadUInt16();
header._versionNeededToExtract = reader.ReadUInt16();
header._generalPurposeBitFlag = reader.ReadUInt16();
header._compressionMethod = reader.ReadUInt16();
header._lastModFileDateTime = reader.ReadUInt32();
header._crc32 = reader.ReadUInt32();
header._compressedSize = reader.ReadUInt32();
header._uncompressedSize = reader.ReadUInt32();
header._fileNameLength = reader.ReadUInt16();
header._extraFieldLength = reader.ReadUInt16();
header._fileCommentLength = reader.ReadUInt16();
header._diskNumberStart = reader.ReadUInt16();
header._internalFileAttributes = reader.ReadUInt16();
header._externalFileAttributes = reader.ReadUInt32();
header._relativeOffsetOfLocalHeader = reader.ReadUInt32();
header._fileName = reader.ReadBytes(header._fileNameLength);
ZipIOZip64ExtraFieldUsage none = ZipIOZip64ExtraFieldUsage.None;
if (header._versionNeededToExtract >= 0x2d)
{
if (header._compressedSize == uint.MaxValue)
{
none |= ZipIOZip64ExtraFieldUsage.CompressedSize;
}
if (header._uncompressedSize == uint.MaxValue)
{
none |= ZipIOZip64ExtraFieldUsage.UncompressedSize;
}
if (header._relativeOffsetOfLocalHeader == uint.MaxValue)
{
none |= ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader;
}
if (header._diskNumberStart == 0xffff)
{
none |= ZipIOZip64ExtraFieldUsage.DiskNumber;
}
}
header._extraField = ZipIOExtraField.ParseRecord(reader, none, header._extraFieldLength);
header._fileComment = reader.ReadBytes(header._fileCommentLength);
header._stringFileName = ZipIOBlockManager.ValidateNormalizeFileName(encoding.GetString(header._fileName));
header.Validate();
return(header);
}
internal static ZipIOExtraFieldElement Parse(BinaryReader reader, ZipIOZip64ExtraFieldUsage zip64extraFieldUsage)
{
ZipIOExtraFieldElement element;
ushort id = reader.ReadUInt16();
ushort size = reader.ReadUInt16();
if (id == ZipIOExtraFieldZip64Element.ConstantFieldId)
{
element = new ZipIOExtraFieldZip64Element();
((ZipIOExtraFieldZip64Element)element).Zip64ExtraFieldUsage = zip64extraFieldUsage;
}
else if (id == ZipIOExtraFieldPaddingElement.ConstantFieldId)
{
if (size < ZipIOExtraFieldPaddingElement.MinimumFieldDataSize)
{
element = new ZipIOExtraFieldElement(id);
}
else
{
byte[] sniffiedBytes = reader.ReadBytes(ZipIOExtraFieldPaddingElement.SignatureSize);
if (ZipIOExtraFieldPaddingElement.MatchesPaddingSignature(sniffiedBytes))
{
element = new ZipIOExtraFieldPaddingElement();
}
else
{
element = new ZipIOExtraFieldElement(id, sniffiedBytes);
}
}
}
else
{
element = new ZipIOExtraFieldElement(id);
}
element.ParseDataField(reader, size);
return(element);
}
// Methods
internal ZipIOExtraFieldZip64Element()
: base(1)
{
this._zip64ExtraFieldUsage = ZipIOZip64ExtraFieldUsage.None;
}
internal static ZipIOExtraField ParseRecord(BinaryReader reader, ZipIOZip64ExtraFieldUsage zip64extraFieldUsage, ushort expectedExtraFieldSize)
{
// most of the files are not ZIP 64, and instead of trying to parse it we should create new empty record
if (expectedExtraFieldSize == 0)
{
if (zip64extraFieldUsage != ZipIOZip64ExtraFieldUsage.None)
{
// in case there is an expectation by the caller for a non empty record we should throw
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
// We are creating Extra Fields for the existing Local File Header,
// so no need to create a new padding field
return(CreateNew(false));
}
ZipIOExtraField extraField = new ZipIOExtraField();
// Parse all Extra elements from Extra Field
while (expectedExtraFieldSize > 0)
{
if (expectedExtraFieldSize < ZipIOExtraFieldElement.MinimumSize)
{
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
ZipIOExtraFieldElement newElement = ZipIOExtraFieldElement.Parse(reader, zip64extraFieldUsage);
ZipIOExtraFieldZip64Element zip64Element = newElement as ZipIOExtraFieldZip64Element;
ZipIOExtraFieldPaddingElement paddingElement = newElement as ZipIOExtraFieldPaddingElement;
// if we have found the Zip 64 record. let's remember it
if (zip64Element != null)
{
if (extraField._zip64Element != null)
{
// multiple ZIP 64 extra fields are not allowed
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
extraField._zip64Element = zip64Element;
}
else if (paddingElement != null)
{
if (extraField._paddingElement != null)
{
// multiple padding extra fields are not allowed
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
extraField._paddingElement = paddingElement;
}
else
{
if (extraField._extraFieldElements == null)
{
extraField._extraFieldElements = new ArrayList(3); // we expect to see a few records there, as it sould have been produced by other authoring systems.
}
// any other instances of extra fields with the same id are allowed
extraField._extraFieldElements.Add(newElement);
}
checked { expectedExtraFieldSize -= newElement.Size; }
}
// if we didn't end up at the exact expected position, we are treating this as a corrupted file
if (expectedExtraFieldSize != 0)
{
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
// As we treat the ZIP 64 extra field as optional for all version >= 4.5
// we need to explicitly consider a case when it is missing
if (extraField._zip64Element == null)
{
extraField._zip64Element = ZipIOExtraFieldZip64Element.CreateNew();
}
/////////////////////////////////////////////////////////////////////
// extraField.Validate();
// an instance Validate function is removed to fix FxCop violation, please add it back
// if extra validation steps are required
//
// we are checking for uniqueness of the Zip 64 header ID in the Parse function.
// Although it might be a good idea to check for record id uniqueness in general,
// we are treating the rest of the field as a bag of bits, so it is probably not worth it to
// search for other duplicate ID especially as appnote considers ID duplication a possibility
// and even suggest a work around for file producers.
/////////////////////////////////////////////////////////////////////
return(extraField);
}
internal static ZipIOExtraField ParseRecord(BinaryReader reader, ZipIOZip64ExtraFieldUsage zip64extraFieldUsage, ushort expectedExtraFieldSize)
{
// most of the files are not ZIP 64, and instead of trying to parse it we should create new empty record
if (expectedExtraFieldSize == 0)
{
if (zip64extraFieldUsage != ZipIOZip64ExtraFieldUsage.None)
{
// in case there is an expectation by the caller for a non empty record we should throw
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
// We are creating Extra Fields for the existing Local File Header,
// so no need to create a new padding field
return CreateNew(false);
}
ZipIOExtraField extraField = new ZipIOExtraField();
// Parse all Extra elements from Extra Field
while (expectedExtraFieldSize > 0)
{
if (expectedExtraFieldSize < ZipIOExtraFieldElement.MinimumSize)
{
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
ZipIOExtraFieldElement newElement = ZipIOExtraFieldElement.Parse(reader, zip64extraFieldUsage);
ZipIOExtraFieldZip64Element zip64Element = newElement as ZipIOExtraFieldZip64Element;
ZipIOExtraFieldPaddingElement paddingElement = newElement as ZipIOExtraFieldPaddingElement;
// if we have found the Zip 64 record. let's remember it
if (zip64Element != null)
{
if (extraField._zip64Element != null)
{
// multiple ZIP 64 extra fields are not allowed
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
extraField._zip64Element = zip64Element;
}
else if (paddingElement != null)
{
if (extraField._paddingElement != null)
{
// multiple padding extra fields are not allowed
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
extraField._paddingElement = paddingElement;
}
else
{
if (extraField._extraFieldElements == null)
extraField._extraFieldElements = new ArrayList(3); // we expect to see a few records there, as it sould have been produced by other authoring systems.
// any other instances of extra fields with the same id are allowed
extraField._extraFieldElements.Add(newElement);
}
checked { expectedExtraFieldSize -= newElement.Size; }
}
// if we didn't end up at the exact expected position, we are treating this as a corrupted file
if (expectedExtraFieldSize != 0)
{
throw new FileFormatException(SR.Get(SRID.CorruptedData));
}
// As we treat the ZIP 64 extra field as optional for all version >= 4.5
// we need to explicitly consider a case when it is missing
if (extraField._zip64Element == null)
{
extraField._zip64Element = ZipIOExtraFieldZip64Element.CreateNew();
}
/////////////////////////////////////////////////////////////////////
// extraField.Validate();
// an instance Validate function is removed to fix FxCop violation, please add it back
// if extra validation steps are required
//
// we are checking for uniqueness of the Zip 64 header ID in the Parse function.
// Although it might be a good idea to check for record id uniqueness in general,
// we are treating the rest of the field as a bag of bits, so it is probably not worth it to
// search for other duplicate ID especially as appnote considers ID duplication a possibility
// and even suggest a work around for file producers.
/////////////////////////////////////////////////////////////////////
return extraField;
}