public _7z_parser(string filepath)
{
//opens xxx.7z passed in parameter
Console.WriteLine("[7z-parser] specified file: " + filepath);
archive_file_reader = new BinaryReader(File.Open(filepath, FileMode.Open));
Console.WriteLine("[7z-parser] reader opened");
//pretty much self-explanatory, covers "SignatureHeader" section in 7zFormat.txt (line 171~188)
read_signature_and_archive_version();
read_StartHeader();
//Move position of archive_file_reader
//will be a problem when _NextHeaderOffset is bigger than "long.MaxValue - 32" but.......... it requires a sinle 1EB .7z file if I do math correctly
//So... this program will break if you have a 1EB .7z file and I don't want to fix this in... foreseeable future
archive_file_reader.BaseStream.Position += (long)_NextHeaderOffset;
Property_IDs flag = (Property_IDs)archive_file_reader.ReadByte();
if (flag == Property_IDs.kHeader)
{
read_Header();
}
else if (flag == Property_IDs.kEncodedHeader)
{
_Encoded_Header = read_Streams_info();
}
else
{
throw new ParseError("Expected kHeader or kEncodedHeader, but got 0x" + Util.Byte_to_hex_string((byte)flag) + "\n" +
"Stream position = " + archive_file_reader.BaseStream.Position);
}
}
/// <summary>
/// covers "Header" section in 7zFormat.txt (line 435~457)
/// </summary>
private void read_Header()
{
Console.WriteLine("[7z-parser] read Header");
Property_IDs flag = (Property_IDs)archive_file_reader.ReadByte();
//optional ArchiveProperties
if (flag == Property_IDs.kArchiveProperties)
{
_Archive_Properties = read_Archive_Properties();
flag = (Property_IDs)archive_file_reader.ReadByte();
}
//optional AdditionalStreamsInfo
if (flag == Property_IDs.kAdditionalStreamsInfo)
{
_Additional_Streams_Info = read_Streams_info();
flag = (Property_IDs)archive_file_reader.ReadByte();
}
//optional MainStreamsInfo
if (flag == Property_IDs.kMainStreamsInfo)
{
_Main_Streams_Info = read_Streams_info();
flag = (Property_IDs)archive_file_reader.ReadByte();
}
//Check kEnd
assert(flag == Property_IDs.kEnd,
"Expected kEnd (0x00), but got 0x" + Util.Byte_to_hex_string((byte)flag) + "\n" +
"Stream position (decimal) = " + archive_file_reader.BaseStream.Position);
Console.WriteLine("[7z-parser] read Header complete");
}
/// <summary>
/// covers "PackInfo" section in 7zFormat.txt (line 218~234)
/// </summary>
private PackInfo read_Pack_Info()
{
Console.WriteLine("[7z-parser] read Pack Info");
PackInfo pack_info = new PackInfo();
pack_info.PackPos = read_7z_UInt64();
Console.WriteLine("PackPos = " + pack_info.PackPos);
pack_info.NumPackStreams = read_7z_UInt64();
Console.WriteLine("NumPackStreams = " + pack_info.NumPackStreams);
Property_IDs flag = (Property_IDs)archive_file_reader.ReadByte();
//handles optional PackSizes
if (flag == Property_IDs.kSize)
{
Console.WriteLine("read KSize");
pack_info.PackSizes = new ulong[pack_info.NumPackStreams];
for (ulong i = 0; i < pack_info.NumPackStreams; i++)
{
pack_info.PackSizes[i] = read_7z_UInt64();
Console.WriteLine("PackSizes[" + i + "] = " + pack_info.PackSizes[i]);
}
flag = (Property_IDs)archive_file_reader.ReadByte();
}
else
{
pack_info.PackSizes = null;
}
//handles optional PackStreamDigests
if (flag == Property_IDs.kCRC)
{
pack_info.PackStreamDigests = new string[pack_info.NumPackStreams];
byte[] CRC_in_bytes;
for (ulong i = 0; i < pack_info.NumPackStreams; i++)
{
CRC_in_bytes = archive_file_reader.ReadBytes(4);
Array.Reverse(CRC_in_bytes);
pack_info.PackStreamDigests[i] = Util.Bytes_to_CRC_string(CRC_in_bytes);
}
flag = (Property_IDs)archive_file_reader.ReadByte();
}
else
{
pack_info.PackSizes = null;
}
//Check kEnd
assert(flag == Property_IDs.kEnd,
"Expected kEnd (0x00), but got 0x" + Util.Byte_to_hex_string((byte)flag) + "\n" +
"Stream position (decimal) = " + archive_file_reader.BaseStream.Position);
Console.WriteLine("[7z-parser] read Pack Info complete");
return(pack_info);
}
/// <summary>
/// covers "Streams Info" section in 7zFormat.txt (line 341~358)
/// </summary>
private StreamsInfo read_Streams_info()
{
Console.WriteLine("[7z-parser] read Streams Info");
StreamsInfo streams_info = new StreamsInfo();
Property_IDs flag = (Property_IDs)archive_file_reader.ReadByte();
//handles optional PackInfo
if (flag == Property_IDs.kPackInfo)
{
streams_info.packInfo = read_Pack_Info();
flag = (Property_IDs)archive_file_reader.ReadByte();
}
else
{
streams_info.packInfo = null;
}
//handles optional CodersInfo
if (flag == Property_IDs.kUnPackInfo)
{
streams_info.codersInfo = read_Coders_Info();
flag = (Property_IDs)archive_file_reader.ReadByte();
}
else
{
streams_info.codersInfo = null;
}
//handles optional PackInfo
if (flag == Property_IDs.kSubStreamsInfo)
{
streams_info.subStreamsInfo = read_SubStreams_info();
flag = (Property_IDs)archive_file_reader.ReadByte();
}
else
{
streams_info.subStreamsInfo = null;
}
//Check kEnd
assert(flag == Property_IDs.kEnd,
"Expected kEnd (0x00), but got 0x" + Util.Byte_to_hex_string((byte)flag) + "\n" +
"Stream position (decimal) = " + archive_file_reader.BaseStream.Position);
Console.WriteLine("[7z-parser] read Header complete");
return(streams_info);
}
/// <summary>
/// covers "ArchiveProperties" section in 7zFormat.txt (line 194~204)
/// </summary>
private List <ArchiveProperty> read_Archive_Properties()
{
List <ArchiveProperty> list = new List <ArchiveProperty>();
while (true)
{
Property_IDs PropertyType = (Property_IDs)archive_file_reader.ReadByte();
if (PropertyType == Property_IDs.kEnd)
{
return(list);
}
ArchiveProperty entry = new ArchiveProperty();
entry.PropertyType = PropertyType;
entry.PropertyData = archive_file_reader.ReadBytes((int)read_7z_UInt64()); //might crash with big PropertySize
Array.Reverse(entry.PropertyData);
list.Add(entry);
//debug message
Console.WriteLine("[7z-parser] archive property type = " + Util.Byte_to_hex_string((byte)entry.PropertyType) +
", PropertySize = " + entry.PropertyData.Length +
", PropertyData = " + Util.Bytes_to_hex_string(entry.PropertyData));
}
}
private SubStreamsInfo read_SubStreams_info()
{
Console.WriteLine("[7z-parser] read Sub streams info");
Console.WriteLine("position = 0x" + archive_file_reader.BaseStream.Position.ToString("X"));
SubStreamsInfo sub_streams_info = new SubStreamsInfo();
Property_IDs flag = (Property_IDs)archive_file_reader.ReadByte();
//handles optional NumUnPackStream
if (flag == Property_IDs.kNumUnPackStream)
{
sub_streams_info.NumUnPackStreamsInFolders = new ulong[_Additional_Streams_Info.codersInfo.NumFolders];
for (ulong i = 0; i < _Additional_Streams_Info.codersInfo.NumFolders; i++)
{
sub_streams_info.NumUnPackStreamsInFolders[i] = read_7z_UInt64();
}
flag = (Property_IDs)archive_file_reader.ReadByte();
}
if (flag == Property_IDs.kSize)
{
}
throw new ParseError("read_SubStreams_info() is not yet implemented");
}
/// <summary>
/// covers "Coders Info" section in 7zFormat.txt (line 281~312)
/// </summary>
private CodersInfo read_Coders_Info()
{
Console.WriteLine("[7z-parser] read Coders Info");
CodersInfo coders_info = new CodersInfo();
Property_IDs flag = (Property_IDs)archive_file_reader.ReadByte();
assert(flag == Property_IDs.kFolder,
"Expected kFolder (0x0B), but got 0x" + Util.Byte_to_hex_string((byte)flag) + "\n" +
"Stream position (decimal) = " + archive_file_reader.BaseStream.Position);
//read NumFolders (line 288 in 7zFormat.txt)
coders_info.NumFolders = read_7z_UInt64();
//read External (line 289~296 in 7zFormat.txt)
coders_info.External = archive_file_reader.ReadBoolean();
Console.WriteLine("External = " + coders_info.External.ToString());
if (!coders_info.External)
{
coders_info.Folders = new Folder[coders_info.NumFolders];
Console.WriteLine("position = 0x" + archive_file_reader.BaseStream.Position.ToString("X"));
for (ulong i = 0; i < coders_info.NumFolders; i++)
{
coders_info.Folders[i] = read_Folder();
}
Console.WriteLine("position = 0x" + archive_file_reader.BaseStream.Position.ToString("X"));
}
else
{
coders_info.Folders = new Folder[0];
coders_info.DataStreamIndex = read_7z_UInt64();
}
//kCodersUnPackSize (line 299 in 7zFormat.txt)
flag = (Property_IDs)archive_file_reader.ReadByte();
assert(flag == Property_IDs.kCodersUnPackSize,
"Expected kCodersUnPackSize (0x0C), but got 0x" + Util.Byte_to_hex_string((byte)flag) + "\n" +
"Stream position (decimal) = " + archive_file_reader.BaseStream.Position);
//read UnPackSize (line 300~302 in 7zFormat.txt)
coders_info.UnPackSizes = new List <ulong>();
foreach (Folder f in coders_info.Folders)
{
for (ulong i = 0; i < f.NumOutStreams; i++)
{
coders_info.UnPackSizes.Add(read_7z_UInt64());
Console.WriteLine("UnPackSizes: " + coders_info.UnPackSizes.Last());
}
}
//kCRC (line 306 in 7zFormat.txt)
flag = (Property_IDs)archive_file_reader.ReadByte();
if (flag == Property_IDs.kCRC)
{
coders_info.UnPackDigests = new string[coders_info.NumFolders];
byte[] CRCbytes;
for (ulong i = 0; i < coders_info.NumFolders; i++)
{
CRCbytes = archive_file_reader.ReadBytes(4);
Array.Reverse(CRCbytes);
coders_info.UnPackDigests[i] = Util.Bytes_to_CRC_string(CRCbytes);
}
flag = (Property_IDs)archive_file_reader.ReadByte();
}
else
{
coders_info.UnPackDigests = null;
}
//Check kEnd
assert(flag == Property_IDs.kEnd,
"Expected kEnd (0x00), but got 0x" + Util.Byte_to_hex_string((byte)flag) + "\n" +
"Stream position (decimal) = " + archive_file_reader.BaseStream.Position);
Console.WriteLine("[7z-parser] read Coders Info complete");
return(coders_info);
}