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[FileTools] More fiddling with Tzip

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This commit is contained in:
Matt Nadareski
2016-09-15 21:25:58 -07:00
parent 6bd7162d00
commit 444fc1696b
3 changed files with 129 additions and 113 deletions
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193
SabreTools.Helper/Objects/ZipFileEntry.cs
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@@ -174,110 +174,109 @@ namespace SabreTools.Helper
try
{
// Open the stream for reading
using (BinaryReader br = new BinaryReader(_zipstream))
BinaryReader br = new BinaryReader(_zipstream);
// If the first bytes aren't a central directory header, log and return
if (br.ReadUInt32() != Constants.CentralDirectoryHeaderSignature)
{
// If the first bytes aren't a central directory header, log and return
if (br.ReadUInt32() != Constants.CentralDirectoryHeaderSignature)
return ZipReturn.ZipCentralDirError;
}
// Now read in available information, skipping the unnecessary
_versionMadeBy = (ArchiveVersion)br.ReadUInt16();
_versionNeeded = (ArchiveVersion)br.ReadUInt16();
_generalPurposeBitFlag = (GeneralPurposeBitFlag)br.ReadUInt16();
_compressionMethod = (CompressionMethod)br.ReadUInt16();
// If we have an unsupported compression method, log and return
if (_compressionMethod != CompressionMethod.Stored && _compressionMethod != CompressionMethod.Deflated)
{
return ZipReturn.ZipCentralDirError;
}
// Keep reading available information, skipping the unnecessary
_lastModFileTime = br.ReadUInt16();
_lastModFileDate = br.ReadUInt16();
_crc = br.ReadUInt32();
_compressedSize = br.ReadUInt32();
_uncompressedSize = br.ReadUInt32();
// Now store some temp vars to find the filename, extra field, and comment
ushort fileNameLength = br.ReadUInt16();
ushort extraFieldLength = br.ReadUInt16();
ushort fileCommentLength = br.ReadUInt16();
// Even more reading available information, skipping the unnecessary
br.ReadUInt16(); // Disk number start
_internalFileAttributes = (InternalFileAttributes)br.ReadUInt16();
_externalFileAttributes = br.ReadUInt32();
_relativeOffset = br.ReadUInt32();
byte[] fileNameBytes = br.ReadBytes(fileNameLength);
_fileName = ((_generalPurposeBitFlag & GeneralPurposeBitFlag.LanguageEncodingFlag) == 0
? Encoding.ASCII.GetString(fileNameBytes)
: Encoding.UTF8.GetString(fileNameBytes, 0, fileNameLength));
_extraField = br.ReadBytes(extraFieldLength);
_comment = br.ReadBytes(fileCommentLength);
/*
Full disclosure: this next section is in GordonJ's work but I honestly
have no idea everything that it does. It seems to do something to figure
out if it's Zip64, or possibly check for random things but it uses the
extra field for this, which I do not fully understand. It's copied in
its entirety below in the hope that it makes things better...
*/
int pos = 0;
while (extraFieldLength > pos)
{
ushort type = BitConverter.ToUInt16(_extraField, pos);
pos += 2;
ushort blockLength = BitConverter.ToUInt16(_extraField, pos);
pos += 2;
switch (type)
{
return ZipReturn.ZipCentralDirError;
}
case 0x0001:
Zip64 = true;
if (UncompressedSize == 0xffffffff)
{
UncompressedSize = BitConverter.ToUInt64(_extraField, pos);
pos += 8;
}
if (_compressedSize == 0xffffffff)
{
_compressedSize = BitConverter.ToUInt64(_extraField, pos);
pos += 8;
}
if (_relativeOffset == 0xffffffff)
{
_relativeOffset = BitConverter.ToUInt64(_extraField, pos);
pos += 8;
}
break;
case 0x7075:
//byte version = extraField[pos];
pos += 1;
uint nameCRC32 = BitConverter.ToUInt32(_extraField, pos);
pos += 4;
// Now read in available information, skipping the unnecessary
_versionMadeBy = (ArchiveVersion)br.ReadUInt16();
_versionNeeded = (ArchiveVersion)br.ReadUInt16();
_generalPurposeBitFlag = (GeneralPurposeBitFlag)br.ReadUInt16();
_compressionMethod = (CompressionMethod)br.ReadUInt16();
CRC32 crcTest = new CRC32();
crcTest.SlurpBlock(fileNameBytes, 0, fileNameLength);
uint fCRC = (uint)crcTest.Crc32Result;
// If we have an unsupported compression method, log and return
if (_compressionMethod != CompressionMethod.Stored && _compressionMethod != CompressionMethod.Deflated)
{
return ZipReturn.ZipCentralDirError;
}
if (nameCRC32 != fCRC)
{
return ZipReturn.ZipCentralDirError;
}
// Keep reading available information, skipping the unnecessary
_lastModFileTime = br.ReadUInt16();
_lastModFileDate = br.ReadUInt16();
_crc = br.ReadUInt32();
_compressedSize = br.ReadUInt32();
_uncompressedSize = br.ReadUInt32();
int charLen = blockLength - 5;
// Now store some temp vars to find the filename, extra field, and comment
ushort fileNameLength = br.ReadUInt16();
ushort extraFieldLength = br.ReadUInt16();
ushort fileCommentLength = br.ReadUInt16();
_fileName = Encoding.UTF8.GetString(_extraField, pos, charLen);
pos += charLen;
// Even more reading available information, skipping the unnecessary
br.ReadUInt16(); // Disk number start
_internalFileAttributes = (InternalFileAttributes)br.ReadUInt16();
_externalFileAttributes = br.ReadUInt16();
_relativeOffset = br.ReadUInt32();
byte[] fileNameBytes = br.ReadBytes(fileNameLength);
_fileName = ((_generalPurposeBitFlag & GeneralPurposeBitFlag.LanguageEncodingFlag) == 0
? Encoding.ASCII.GetString(fileNameBytes)
: Encoding.UTF8.GetString(fileNameBytes, 0, fileNameLength));
_extraField = br.ReadBytes(extraFieldLength);
_comment = br.ReadBytes(fileCommentLength);
/*
Full disclosure: this next section is in GordonJ's work but I honestly
have no idea everything that it does. It seems to do something to figure
out if it's Zip64, or possibly check for random things but it uses the
extra field for this, which I do not fully understand. It's copied in
its entirety below in the hope that it makes things better...
*/
int pos = 0;
while (extraFieldLength > pos)
{
ushort type = BitConverter.ToUInt16(_extraField, pos);
pos += 2;
ushort blockLength = BitConverter.ToUInt16(_extraField, pos);
pos += 2;
switch (type)
{
case 0x0001:
Zip64 = true;
if (UncompressedSize == 0xffffffff)
{
UncompressedSize = BitConverter.ToUInt64(_extraField, pos);
pos += 8;
}
if (_compressedSize == 0xffffffff)
{
_compressedSize = BitConverter.ToUInt64(_extraField, pos);
pos += 8;
}
if (_relativeOffset == 0xffffffff)
{
_relativeOffset = BitConverter.ToUInt64(_extraField, pos);
pos += 8;
}
break;
case 0x7075:
//byte version = extraField[pos];
pos += 1;
uint nameCRC32 = BitConverter.ToUInt32(_extraField, pos);
pos += 4;
CRC32 crcTest = new CRC32();
crcTest.SlurpBlock(fileNameBytes, 0, fileNameLength);
uint fCRC = (uint)crcTest.Crc32Result;
if (nameCRC32 != fCRC)
{
return ZipReturn.ZipCentralDirError;
}
int charLen = blockLength - 5;
_fileName = Encoding.UTF8.GetString(_extraField, pos, charLen);
pos += charLen;
break;
default:
pos += blockLength;
break;
}
break;
default:
pos += blockLength;
break;
}
}
}