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CHM objectification cleanup

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This commit is contained in:
Matt Nadareski
2022-05-23 14:25:22 -07:00
parent 394b4e70fb
commit 98a7149cc9
5 changed files with 433 additions and 127 deletions
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162
BurnOutSharp/External/libmspack/CHM/Decompressor.cs vendored
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@@ -373,7 +373,7 @@ namespace LibMSPackSharp.CHM
else
{
// PMGL chunks only, search from first_pmgl to last_pmgl
for (n = chm.HeaderSection1.FirstPMGL; n <= chm.HeaderSection1.LastPMGL; n = BitConverter.ToUInt32(chunk, pmgl_NextChunk))
for (n = chm.HeaderSection1.FirstPMGL; n <= chm.HeaderSection1.LastPMGL; n = BitConverter.ToUInt32(chunk, 0x0010))
{
if ((chunk = ReadChunk(chm, fh, n)) == null)
{
@@ -386,7 +386,7 @@ namespace LibMSPackSharp.CHM
break;
// Stop simple infinite loops: can't visit the same chunk twice
if (n == BitConverter.ToUInt32(chunk, pmgl_NextChunk))
if (n == BitConverter.ToUInt32(chunk, 0x0010))
break;
}
}
@@ -458,7 +458,7 @@ namespace LibMSPackSharp.CHM
/// </summary>
internal Error InitDecompressor(DecompressFile file)
{
int window_size, window_bits, reset_interval, entry;
int entry;
byte[] data;
MSCompressedSection sec = file.Section as MSCompressedSection;
@@ -480,7 +480,7 @@ namespace LibMSPackSharp.CHM
sec.Control = controlFile;
// Read ControlData
if (sec.Control.Length != lzxcd_SIZEOF)
if (sec.Control.Length != _LZXControlData.Size)
{
Console.WriteLine("ControlData file is wrong size");
return Error = Error.MSPACK_ERR_DATAFORMAT;
@@ -492,58 +492,28 @@ namespace LibMSPackSharp.CHM
return Error;
}
//// Create a new control data based on that
//err = _LZXControlData.Create(data, out _LZXControlData lzxControlData);
//if (err != Error.MSPACK_ERR_OK)
// return err;
// Check LZXC signature
if (BitConverter.ToUInt32(data, lzxcd_Signature) != 0x43585A4C)
return Error = Error.MSPACK_ERR_SIGNATURE;
// Read reset_interval and window_size and validate version number
switch (BitConverter.ToUInt32(data, lzxcd_Version))
{
case 1:
reset_interval = (int)BitConverter.ToUInt32(data, lzxcd_ResetInterval);
window_size = (int)BitConverter.ToUInt32(data, lzxcd_WindowSize);
break;
case 2:
reset_interval = (int)BitConverter.ToUInt32(data, lzxcd_ResetInterval) * LZX.LZX_FRAME_SIZE;
window_size = (int)BitConverter.ToUInt32(data, lzxcd_WindowSize) * LZX.LZX_FRAME_SIZE;
break;
default:
Console.WriteLine("Bad controldata version");
return Error = Error.MSPACK_ERR_DATAFORMAT;
}
// Create a new control data based on that
err = _LZXControlData.Create(data, out _LZXControlData lzxControlData);
if (err != Error.MSPACK_ERR_OK)
return Error = err;
// Find window_bits from window_size
switch (window_size)
{
case 0x008000: window_bits = 15; break;
case 0x010000: window_bits = 16; break;
case 0x020000: window_bits = 17; break;
case 0x040000: window_bits = 18; break;
case 0x080000: window_bits = 19; break;
case 0x100000: window_bits = 20; break;
case 0x200000: window_bits = 21; break;
default:
Console.WriteLine("Bad controldata window size");
return Error = Error.MSPACK_ERR_DATAFORMAT;
}
err = lzxControlData.GetWindowBits(out int windowBits);
if (err != Error.MSPACK_ERR_OK)
return Error = err;
// Validate reset_interval
if (reset_interval == 0 || (reset_interval % LZX.LZX_FRAME_SIZE) != 0)
if (lzxControlData.ResetInterval == 0 || (lzxControlData.ResetInterval % LZX.LZX_FRAME_SIZE) != 0)
{
Console.WriteLine("Bad controldata reset interval");
return Error = Error.MSPACK_ERR_DATAFORMAT;
}
// Which reset table entry would we like?
entry = (int)(file.Offset / reset_interval);
entry = (int)(file.Offset / lzxControlData.ResetInterval);
// Convert from reset interval multiple (usually 64k) to 32k frames
entry *= reset_interval / LZX.LZX_FRAME_SIZE;
entry *= (int)lzxControlData.ResetInterval / LZX.LZX_FRAME_SIZE;
// Read the reset table entry
if (ReadResetTable(sec, (uint)entry, out long length, out long offset))
@@ -551,8 +521,8 @@ namespace LibMSPackSharp.CHM
// The uncompressed length given in the reset table is dishonest.
// The uncompressed data is always padded out from the given
// uncompressed length up to the next reset interval
length += reset_interval - 1;
length &= -reset_interval;
length += lzxControlData.ResetInterval - 1;
length &= -lzxControlData.ResetInterval;
}
else
{
@@ -577,7 +547,7 @@ namespace LibMSPackSharp.CHM
length -= State.Offset;
// Initialise LZX stream
State.State = LZX.Init(State.System, State.InputFileHandle, State.OutputFileHandle, window_bits, reset_interval / LZX.LZX_FRAME_SIZE, 4096, length, false);
State.State = LZX.Init(State.System, State.InputFileHandle, State.OutputFileHandle, windowBits, (int)lzxControlData.ResetInterval / LZX.LZX_FRAME_SIZE, 4096, length, false);
if (State.State == null)
Error = Error.MSPACK_ERR_NOMEMORY;
@@ -818,7 +788,7 @@ namespace LibMSPackSharp.CHM
// Ensure there are chunks and that chunk size is
// large enough for signature and num_entries
if (chm.HeaderSection1.ChunkSize < (pmgl_PMGLEntries + 2))
if (chm.HeaderSection1.ChunkSize < (_PMGHeader.PMGLSize + 2))
{
Console.WriteLine("Chunk size not large enough");
return Error.MSPACK_ERR_DATAFORMAT;
@@ -895,22 +865,22 @@ namespace LibMSPackSharp.CHM
if (System.Read(fh, chunk, 0, (int)chm.HeaderSection1.ChunkSize) != (int)chm.HeaderSection1.ChunkSize)
return Error.MSPACK_ERR_READ;
//// Create a new header based on that
//err = _PMGHeader.Create(buf, out _PMGHeader pmglHeader);
//if (err != Error.MSPACK_ERR_OK)
// return err;
// Create a new header based on that
err = _PMGHeader.Create(buf, out _PMGHeader pmgHeader);
if (err != Error.MSPACK_ERR_OK)
return err;
// Process only directory (PMGL) chunks
if (BitConverter.ToUInt32(chunk, pmgl_Signature) != 0x4C474D50)
if (!pmgHeader.IsPMGL())
continue;
if (BitConverter.ToUInt32(chunk, pmgl_QuickRefSize) < 2)
if (pmgHeader.QuickRefSize < 2)
System.Message(fh, "WARNING; PMGL quickref area is too small");
if (BitConverter.ToUInt32(chunk, pmgl_QuickRefSize) > chm.HeaderSection1.ChunkSize - pmgl_PMGLEntries)
if (pmgHeader.QuickRefSize > chm.HeaderSection1.ChunkSize - pmgHeader.PMGLEntries)
System.Message(fh, "WARNING; PMGL quickref area is too large");
p = pmgl_PMGLEntries;
p = (int)pmgHeader.PMGLEntries;
end = (int)(chm.HeaderSection1.ChunkSize - 2);
numEntries = BitConverter.ToUInt16(chunk, end);
@@ -1010,13 +980,14 @@ namespace LibMSPackSharp.CHM
continue;
}
fi = new DecompressFile();
fi.Next = null;
fi.Filename = Encoding.UTF8.GetString(chunk, name, (int)nameLen) + "\0";
fi.Section = (section == 0) ? chm.Sec0 as Section : chm.Sec1 as Section;
fi.Offset = offset;
fi.Length = length;
fi = new DecompressFile()
{
Next = null,
Filename = Encoding.UTF8.GetString(chunk, name, (int)nameLen) + "\0",
Section = (section == 0) ? chm.Sec0 as Section : chm.Sec1 as Section,
Offset = offset,
Length = length,
};
if (chunk[name + 0] == ':' && chunk[name + 1] == ':')
{
@@ -1054,12 +1025,12 @@ namespace LibMSPackSharp.CHM
/// <summary>
/// Reads one entry out of the reset table. Also reads the uncompressed
/// data length. Writes these to offset_ptr and length_ptr respectively.
/// data length. Writes these to offsetPointer and lengthPointer respectively.
/// Returns non-zero for success, zero for failure.
/// </summary>
private bool ReadResetTable(MSCompressedSection sec, uint entry, out long length_ptr, out long offset_ptr)
private bool ReadResetTable(MSCompressedSection sec, uint entry, out long lengthPointer, out long offsetPointer)
{
length_ptr = 0; offset_ptr = 0;
lengthPointer = 0; offsetPointer = 0;
byte[] data;
// Do we have a ResetTable file?
@@ -1071,7 +1042,7 @@ namespace LibMSPackSharp.CHM
sec.ResetTable = resetTable;
// Read ResetTable file
if (sec.ResetTable.Length < lzxrt_headerSIZEOF)
if (sec.ResetTable.Length < _LZXResetTable.Size)
{
Console.WriteLine("ResetTable file is too short");
return false;
@@ -1090,36 +1061,35 @@ namespace LibMSPackSharp.CHM
return false;
}
//// Create a new reset data based on that
//err = _LZXResetTable.Create(data, out _LZXResetTable lzxResetTable);
//if (err != Error.MSPACK_ERR_OK)
// return false;
// Create a new reset data based on that
err = _LZXResetTable.Create(data, out _LZXResetTable lzxResetTable);
if (err != Error.MSPACK_ERR_OK)
return false;
// Check sanity of reset table
if (BitConverter.ToUInt32(data, lzxrt_FrameLen) != LZX.LZX_FRAME_SIZE)
if (lzxResetTable.FrameLength != LZX.LZX_FRAME_SIZE)
{
Console.WriteLine("Bad reset table frame length");
return false;
}
// Get the uncompressed length of the LZX stream
if ((length_ptr = BitConverter.ToInt64(data, lzxrt_UncompLen)) == 0)
if ((lengthPointer = lzxResetTable.UncompressedLength) == 0)
return false;
uint entrysize = BitConverter.ToUInt32(data, lzxrt_EntrySize);
uint pos = BitConverter.ToUInt32(data, lzxrt_TableOffset) + (entry * entrysize);
uint pos = lzxResetTable.TableOffset + (entry * lzxResetTable.EntrySize);
// Ensure reset table entry for this offset exists
if (entry < BitConverter.ToUInt32(data, lzxrt_NumEntries) && pos <= (sec.ResetTable.Length - entrysize))
if (entry < lzxResetTable.NumEntries && pos <= (sec.ResetTable.Length - lzxResetTable.EntrySize))
{
switch (entrysize)
switch (lzxResetTable.EntrySize)
{
case 4:
offset_ptr = BitConverter.ToUInt32(data, (int)pos);
offsetPointer = BitConverter.ToUInt32(data, (int)pos);
err = Error.MSPACK_ERR_OK;
break;
case 8:
offset_ptr = BitConverter.ToInt64(data, (int)pos);
offsetPointer = BitConverter.ToInt64(data, (int)pos);
break;
default:
Console.WriteLine("Reset table entry size neither 4 nor 8");
@@ -1262,22 +1232,22 @@ namespace LibMSPackSharp.CHM
{
int p;
uint nameLen;
uint left, right, midpoint, entriesOff;
bool is_pmgl;
uint left, right, midpoint, entries;
int cmp;
// Create a new header based on the chunk
Error err = _PMGHeader.Create(chunk, out _PMGHeader pmgHeader);
if (err != Error.MSPACK_ERR_OK)
return -1;
// TODO: Figure out what `entriesOff` does. It feels like it's being used wrong
// PMGL chunk or PMGI chunk? (note: read_chunk() has already
// checked the rest of the characters in the chunk signature)
if (chunk[3] == 0x4C)
{
is_pmgl = true;
entriesOff = pmgl_PMGLEntries;
}
if (pmgHeader.IsPMGL())
entries = pmgHeader.PMGLEntries;
else
{
is_pmgl = false;
entriesOff = pmgl_PMGIEntries;
}
entries = pmgHeader.PMGIEntries;
// Step 1: binary search first filename of each QR entry
// - target filename == entry
@@ -1288,7 +1258,7 @@ namespace LibMSPackSharp.CHM
// proceed to step 2 using final entry
// - target filename between two searched entries
// Proceed to step 2
uint qrSize = BitConverter.ToUInt32(chunk, pmgl_QuickRefSize);
uint qrSize = pmgHeader.QuickRefSize;
int start = (int)(chm.HeaderSection1.ChunkSize - 2);
int end = (int)(chm.HeaderSection1.ChunkSize - qrSize);
ushort numEntries = BitConverter.ToUInt16(chunk, start);
@@ -1325,7 +1295,7 @@ namespace LibMSPackSharp.CHM
midpoint = (left + right) >> 1;
// Compare filename with entry QR points to
p = (int)(entriesOff + (midpoint != 0 ? BitConverter.ToUInt16(chunk, (int)(start - (midpoint << 1))) : 0));
p = (int)(entries + (midpoint != 0 ? BitConverter.ToUInt16(chunk, (int)(start - (midpoint << 1))) : 0));
// READ_ENCINT(nameLen)
nameLen = 0;
@@ -1376,14 +1346,14 @@ namespace LibMSPackSharp.CHM
}
// Otherwise, read the group of entries for QR entry M
p = (int)(entriesOff + (midpoint != 0 ? BitConverter.ToUInt16(chunk, (int)(start - (midpoint << 1))) : 0));
p = (int)(entries + (midpoint != 0 ? BitConverter.ToUInt16(chunk, (int)(start - (midpoint << 1))) : 0));
numEntries -= (ushort)(midpoint * qrDensity);
if (numEntries > qrDensity)
numEntries = (ushort)qrDensity;
}
else
{
p = (int)entriesOff;
p = (int)entries;
}
// Step 2: linear search through the set of entries reached in step 1.
@@ -1432,7 +1402,7 @@ namespace LibMSPackSharp.CHM
}
// Read and ignore the rest of this entry
if (is_pmgl)
if (pmgHeader.IsPMGL())
{
// Skip section, offset, and length
for (int i = 0; i < 3; i++)
@@ -1472,7 +1442,7 @@ namespace LibMSPackSharp.CHM
}
// PMGL? not found. PMGI? maybe found
return (is_pmgl) ? 0 : (result != 0 ? 1 : 0);
return (pmgHeader.IsPMGL()) ? 0 : (result != 0 ? 1 : 0);
}
#endregion

155
BurnOutSharp/External/libmspack/CHM/_LZXControlData.cs vendored Normal file
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@@ -0,0 +1,155 @@
/* This file is part of libmspack.
* (C) 2003-2004 Stuart Caie.
*
* libmspack is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License (LGPL) version 2.1
*
* For further details, see the file COPYING.LIB distributed with libmspack
*/
using System;
using LibMSPackSharp.Compression;
namespace LibMSPackSharp.CHM
{
internal class _LZXControlData
{
#region Fields
/// <summary>
/// Length of the control data
/// </summary>
/// <remarks>0x0000</remarks>
public uint Length { get; private set; }
/// <summary>
/// "LZXC"
/// </summary>
/// <remarks>0x0004</remarks>
public uint Signature { get; private set; }
/// <summary>
/// Control data version
/// </summary>
/// <remarks>0x0008</remarks>
public uint Version { get; private set; }
/// <summary>
/// Reset interval
/// </summary>
/// <remarks>0x000C</remarks>
public uint ResetInterval { get; private set; }
/// <summary>
/// Window size
/// </summary>
/// <remarks>0x0010</remarks>
public uint WindowSize { get; private set; }
/// <summary>
/// Cache size
/// </summary>
/// <remarks>0x0014</remarks>
public uint CacheSize { get; private set; }
/// <summary>
/// Cache size
/// </summary>
/// <remarks>0x0018</remarks>
public uint Unknown1 { get; private set; }
/// <summary>
/// Total size of the LZX control data in bytes
/// </summary>
public const int Size = 0x001C;
#endregion
/// <summary>
/// Private constructor
/// </summary>
private _LZXControlData() { }
/// <summary>
/// Create a _LZXControlData from a byte array, if possible
/// </summary>
public static Error Create(byte[] buffer, out _LZXControlData controlData)
{
controlData = null;
if (buffer == null || buffer.Length < Size)
return Error.MSPACK_ERR_READ;
controlData = new _LZXControlData();
controlData.Length = BitConverter.ToUInt32(buffer, 0x0000);
controlData.Signature = BitConverter.ToUInt32(buffer, 0x0004);
if (controlData.Signature != 0x43585A4C)
return Error.MSPACK_ERR_SIGNATURE;
controlData.Version = BitConverter.ToUInt32(buffer, 0x0008);
switch (controlData.Version)
{
case 1:
controlData.ResetInterval = BitConverter.ToUInt32(buffer, 0x000C);
controlData.WindowSize = BitConverter.ToUInt32(buffer, 0x0010);
break;
case 2:
controlData.ResetInterval = BitConverter.ToUInt32(buffer, 0x000C) * LZX.LZX_FRAME_SIZE;
controlData.WindowSize = BitConverter.ToUInt32(buffer, 0x0010) * LZX.LZX_FRAME_SIZE;
break;
default:
return Error.MSPACK_ERR_DATAFORMAT;
}
controlData.CacheSize = BitConverter.ToUInt32(buffer, 0x0014);
controlData.Unknown1 = BitConverter.ToUInt32(buffer, 0x0018);
return Error.MSPACK_ERR_OK;
}
/// <summary>
/// Get the number of bits in the window based on the window size
/// </summary>
/// <param name="windowBits">Window </param>
/// <returns>An error code or MSPACK_ERR_OK if all is good</returns>
public Error GetWindowBits(out int windowBits)
{
switch (WindowSize)
{
case 0x008000:
windowBits = 15;
break;
case 0x010000:
windowBits = 16;
break;
case 0x020000:
windowBits = 17;
break;
case 0x040000:
windowBits = 18;
break;
case 0x080000:
windowBits = 19;
break;
case 0x100000:
windowBits = 20;
break;
case 0x200000:
windowBits = 21;
break;
default:
windowBits = -1;
return Error.MSPACK_ERR_DATAFORMAT;
}
return Error.MSPACK_ERR_OK;
}
}
}

94
BurnOutSharp/External/libmspack/CHM/_LZXResetTable.cs vendored Normal file
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@@ -0,0 +1,94 @@
/* This file is part of libmspack.
* (C) 2003-2004 Stuart Caie.
*
* libmspack is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License (LGPL) version 2.1
*
* For further details, see the file COPYING.LIB distributed with libmspack
*/
using System;
namespace LibMSPackSharp.CHM
{
internal class _LZXResetTable
{
#region Fields
/// <summary>
/// UNKNOWN
/// </summary>
/// <remarks>0x0000</remarks>
public uint Unknown1 { get; private set; }
/// <summary>
/// Number of entries in the table
/// </summary>
/// <remarks>0x0004</remarks>
public uint NumEntries { get; private set; }
/// <summary>
/// Size of each entry
/// </summary>
/// <remarks>0x0008</remarks>
public uint EntrySize { get; private set; }
/// <summary>
/// Table offset
/// </summary>
/// <remarks>0x000C</remarks>
public uint TableOffset { get; private set; }
/// <summary>
/// Uncompressed length
/// </summary>
/// <remarks>0x0010</remarks>
public long UncompressedLength { get; private set; }
/// <summary>
/// Compressed length
/// </summary>
/// <remarks>0x0018</remarks>
public long CompressedLength { get; private set; }
/// <summary>
/// Frame length
/// </summary>
/// <remarks>0x0020</remarks>
public long FrameLength { get; private set; }
/// <summary>
/// Total size of the LZX reset table in bytes
/// </summary>
public const int Size = 0x0028;
#endregion
/// <summary>
/// Private constructor
/// </summary>
private _LZXResetTable() { }
/// <summary>
/// Create a _LZXControlData from a byte array, if possible
/// </summary>
public static Error Create(byte[] buffer, out _LZXResetTable resetTable)
{
resetTable = null;
if (buffer == null || buffer.Length < Size)
return Error.MSPACK_ERR_READ;
resetTable = new _LZXResetTable();
resetTable.Unknown1 = BitConverter.ToUInt32(buffer, 0x0000);
resetTable.NumEntries = BitConverter.ToUInt32(buffer, 0x0004);
resetTable.EntrySize = BitConverter.ToUInt32(buffer, 0x0008);
resetTable.TableOffset = BitConverter.ToUInt32(buffer, 0x000C);
resetTable.UncompressedLength = BitConverter.ToInt64(buffer, 0x0010);
resetTable.CompressedLength = BitConverter.ToInt64(buffer, 0x0018);
resetTable.FrameLength = BitConverter.ToInt64(buffer, 0x0020);
return Error.MSPACK_ERR_OK;
}
}
}

118
BurnOutSharp/External/libmspack/CHM/_PMGHeader.cs vendored Normal file
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@@ -0,0 +1,118 @@
/* This file is part of libmspack.
* (C) 2003-2004 Stuart Caie.
*
* libmspack is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License (LGPL) version 2.1
*
* For further details, see the file COPYING.LIB distributed with libmspack
*/
using System;
namespace LibMSPackSharp.CHM
{
internal class _PMGHeader
{
#region Fields
/// <summary>
/// "PMGL" or "PMGI"
/// </summary>
/// <remarks>0x0000</remarks>
public uint Signature { get; private set; }
/// <summary>
/// Quick reference size
/// </summary>
/// <remarks>0x0004</remarks>
public uint QuickRefSize { get; private set; }
/// <summary>
/// Number of entries in a PMGI chunk
/// </summary>
/// <remarks>
/// 0x0008
///
/// Unused in PMGL
/// </remarks>
public uint PMGIEntries { get; private set; }
/// <summary>
/// Previous chunk ID
/// </summary>
/// <remarks>
/// 0x000C
///
/// Does not exist in PMGI
/// </remarks>
public uint PrevChunk { get; private set; }
/// <summary>
/// Next chunk ID
/// </summary>
/// <remarks>
/// 0x0010
///
/// Does not exist in PMGI
/// </remarks>
public uint NextChunk { get; private set; }
/// <summary>
/// Number of entries in a PMGL chunk
/// </summary>
/// <remarks>
/// 0x0014
///
/// Does not exist in PMGI
/// </remarks>
public uint PMGLEntries { get; private set; }
/// <summary>
/// Total size of the PMGI header in bytes
/// </summary>
public const int PMGISize = 0x000C;
/// <summary>
/// Total size of the PMGL header in bytes
/// </summary>
public const int PMGLSize = 0x0014;
#endregion
/// <summary>
/// Private constructor
/// </summary>
private _PMGHeader() { }
/// <summary>
/// Create a _PMGHeader from a byte array, if possible
/// </summary>
public static Error Create(byte[] buffer, out _PMGHeader header)
{
header = null;
if (buffer == null || buffer.Length < PMGISize)
return Error.MSPACK_ERR_READ;
header = new _PMGHeader();
header.Signature = BitConverter.ToUInt32(buffer, 0x0000);
header.QuickRefSize = BitConverter.ToUInt32(buffer, 0x0004);
header.PMGIEntries = BitConverter.ToUInt32(buffer, 0x0008);
if (buffer.Length >= PMGLSize)
{
header.PrevChunk = BitConverter.ToUInt32(buffer, 0x000C);
header.NextChunk = BitConverter.ToUInt32(buffer, 0x0010);
header.PMGLEntries = BitConverter.ToUInt32(buffer, 0x0014);
}
return Error.MSPACK_ERR_OK;
}
/// <summary>
/// Determines if a PMG chunk is PMGL or PMGI
/// </summary>
/// <returns>True for PMGL and false of PMGI</returns>
public bool IsPMGL() => Signature == 0x4C474D50;
}
}

31
BurnOutSharp/External/libmspack/Constants.cs vendored
View File

@@ -42,37 +42,6 @@ namespace LibMSPackSharp
#region CHM
// _PMGHeader
public const int pmgl_Signature = 0x0000;
public const int pmgl_QuickRefSize = 0x0004;
public const int pmgl_PMGIEntries = 0x0008; // Unknown1 in PMGL
public const int pmgl_PrevChunk = 0x000C; // Not in PMGI
public const int pmgl_NextChunk = 0x0010; // Not in PMGI
public const int pmgl_PMGLEntries = 0x0014; // Not in PMGI
public const int pmgl_headerSIZEOF = 0x0014;
public const int pmgi_headerSIZEOF = 0x000C;
// _LZXControlData
public const int lzxcd_Length = 0x0000;
public const int lzxcd_Signature = 0x0004;
public const int lzxcd_Version = 0x0008;
public const int lzxcd_ResetInterval = 0x000C;
public const int lzxcd_WindowSize = 0x0010;
public const int lzxcd_CacheSize = 0x0014;
public const int lzxcd_Unknown1 = 0x0018;
public const int lzxcd_SIZEOF = 0x001C;
// _LZXResetTable
public const int lzxrt_Unknown1 = 0x0000;
public const int lzxrt_NumEntries = 0x0004;
public const int lzxrt_EntrySize = 0x0008;
public const int lzxrt_TableOffset = 0x000C;
public const int lzxrt_UncompLen = 0x0010;
public const int lzxrt_CompLen = 0x0018;
public const int lzxrt_FrameLen = 0x0020;
public const int lzxrt_Entries = 0x0028;
public const int lzxrt_headerSIZEOF = 0x0028;
// Filenames of the system files used for decompression.
// - Content and ControlData are essential.
// - ResetTable is preferred, but SpanInfo can be used if not available