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Add generic data reading

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This commit is contained in:
Matt Nadareski
2023-01-09 22:15:37 -08:00
parent b980b33019
commit 068ee76983
1 changed files with 106 additions and 8 deletions
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114
BurnOutSharp.Wrappers/CFB.cs
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@@ -166,16 +166,16 @@ namespace BurnOutSharp.Wrappers
/// </summary>
/// <param name="startingSector">Initial FAT sector</param>
/// <returns>Ordered list of sector numbers, null on error</returns>
public List<Models.CFB.SectorNumber> GetFATSectorChain(uint startingSector)
public List<Models.CFB.SectorNumber> GetFATSectorChain(Models.CFB.SectorNumber startingSector)
{
// If we have an invalid sector
if (startingSector < 0 || startingSector >= FATSectorNumbers.Length)
if (startingSector < 0 || (long)startingSector >= FATSectorNumbers.Length)
return null;
// Setup the returned list
var sectors = new List<Models.CFB.SectorNumber> { (Models.CFB.SectorNumber)startingSector };
var sectors = new List<Models.CFB.SectorNumber> { startingSector };
var lastSector = (Models.CFB.SectorNumber)startingSector;
var lastSector = startingSector;
while (true)
{
// Get the next sector from the lookup table
@@ -193,21 +193,55 @@ namespace BurnOutSharp.Wrappers
return sectors;
}
/// <summary>
/// Get the data for the FAT sector chain starting at a given starting sector
/// </summary>
/// <param name="startingSector">Initial FAT sector</param>
/// <returns>Ordered list of sector numbers, null on error</returns>
public byte[] GetFATSectorChainData(Models.CFB.SectorNumber startingSector)
{
// Get the sector chain first
var sectorChain = GetFATSectorChain(startingSector);
if (sectorChain == null)
return null;
// Sequentially read the sectors
var data = new List<byte>();
for (int i = 0; i < sectorChain.Count; i++)
{
// Try to get the sector data offset
int sectorDataOffset = (int)ToFileOffset(sectorChain[i]);
if (sectorDataOffset < 0 || sectorDataOffset >= GetEndOfFile())
return null;
// Try to read the sector data
int sectorDataLength = (int)Math.Pow(2, SectorShift);
var sectorData = ReadFromDataSource(sectorDataOffset, sectorDataLength);
if (sectorData == null)
return null;
// Add the sector data to the output
data.AddRange(sectorData);
}
return data.ToArray();
}
/// <summary>
/// Get the ordered Mini FAT sector chain for a given starting sector
/// </summary>
/// <param name="startingSector">Initial Mini FAT sector</param>
/// <returns>Ordered list of sector numbers, null on error</returns>
public List<Models.CFB.SectorNumber> GetMiniFATSectorChain(uint startingSector)
public List<Models.CFB.SectorNumber> GetMiniFATSectorChain(Models.CFB.SectorNumber startingSector)
{
// If we have an invalid sector
if (startingSector < 0 || startingSector >= MiniFATSectorNumbers.Length)
if (startingSector < 0 || (long)startingSector >= MiniFATSectorNumbers.Length)
return null;
// Setup the returned list
var sectors = new List<Models.CFB.SectorNumber> { (Models.CFB.SectorNumber)startingSector };
var sectors = new List<Models.CFB.SectorNumber> { startingSector };
var lastSector = (Models.CFB.SectorNumber)startingSector;
var lastSector = startingSector;
while (true)
{
// Get the next sector from the lookup table
@@ -225,6 +259,70 @@ namespace BurnOutSharp.Wrappers
return sectors;
}
/// <summary>
/// Get the data for the Mini FAT sector chain starting at a given starting sector
/// </summary>
/// <param name="startingSector">Initial Mini FAT sector</param>
/// <returns>Ordered list of sector numbers, null on error</returns>
public byte[] GetMiniFATSectorChainData(Models.CFB.SectorNumber startingSector)
{
// Get the sector chain first
var sectorChain = GetMiniFATSectorChain(startingSector);
if (sectorChain == null)
return null;
// Sequentially read the sectors
var data = new List<byte>();
for (int i = 0; i < sectorChain.Count; i++)
{
// Try to get the sector data offset
int sectorDataOffset = (int)ToMiniFileOffset(sectorChain[i]);
if (sectorDataOffset < 0 || sectorDataOffset >= GetEndOfFile())
return null;
// Try to read the sector data
int sectorDataLength = (int)Math.Pow(2, MiniSectorShift);
var sectorData = ReadFromDataSource(sectorDataOffset, sectorDataLength);
if (sectorData == null)
return null;
// Add the sector data to the output
data.AddRange(sectorData);
}
return data.ToArray();
}
/// <summary>
/// Convert a FAT sector value to a byte offset
/// </summary>
/// <param name="sector">Sector to convert</param>
/// <returns>File offset in bytes, -1 on error</returns>
public long ToFileOffset(Models.CFB.SectorNumber sector)
{
// If we have an invalid sector number
if (sector > Models.CFB.SectorNumber.MAXREGSECT)
return -1;
// Convert based on the sector shift value
return (long)((long)(sector + 1) * Math.Pow(2, SectorShift));
}
/// <summary>
/// Convert a Mini FAT sector value to a byte offset
/// </summary>
/// <param name="sector">Sector to convert</param>
/// <returns>File offset in bytes, -1 on error</returns>
public long ToMiniFileOffset(Models.CFB.SectorNumber sector)
{
// If we have an invalid sector number
if (sector > Models.CFB.SectorNumber.MAXREGSECT)
return -1;
// Convert based on the sector shift value
return (long)((long)(sector + 1) * Math.Pow(2, MiniSectorShift));
}
#endregion
#region Printing