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[CHDFile] Organization
This commit is contained in:
Matt Nadareski
250
SabreTools.Library/External/CHDFile.cs
vendored
250
SabreTools.Library/External/CHDFile.cs
vendored
@@ -66,126 +66,29 @@ namespace SabreTools.Library.External
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/// </remrks>
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public class CHDFile
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{
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#region Private instance variables
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// Core parameters from the header
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public ulong m_signature; // signature
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public uint m_headersize; // size of the header
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public uint m_version; // version of the header
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public ulong m_logicalbytes; // logical size of the raw CHD data in bytes
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public ulong m_mapoffset; // offset of map
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public ulong m_metaoffset; // offset to first metadata bit
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public uint m_hunkbytes; // size of each raw hunk in bytes
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private ulong m_signature; // signature
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private uint m_headersize; // size of the header
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private uint m_version; // version of the header
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private ulong m_logicalbytes; // logical size of the raw CHD data in bytes
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private ulong m_mapoffset; // offset of map
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private ulong m_metaoffset; // offset to first metadata bit
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private uint m_hunkbytes; // size of each raw hunk in bytes
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private ulong m_hunkcount; // number of hunks represented
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public uint m_unitbytes; // size of each unit in bytes
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public ulong m_unitcount; // number of units represented
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public CHDCodecType[] m_compression = new CHDCodecType[4]; // array of compression types used
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private uint m_unitbytes; // size of each unit in bytes
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private ulong m_unitcount; // number of units represented
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private CHDCodecType[] m_compression = new CHDCodecType[4]; // array of compression types used
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// map information
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public uint m_mapentrybytes; // length of each entry in a map
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private uint m_mapentrybytes; // length of each entry in a map
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/// <summary>
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/// Get internal metadata from a CHD
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/// </summary>
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/// <param name="filename">Filename of possible CHD</param>
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/// <returns>A Disk object with internal SHA-1 on success, null on error, empty Disk otherwise</returns>
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/// <remarks>
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/// Original code had a "writable" param. This is not required for metadata checking
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/// </remarks>
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public static DatItem GetCHDInfo(string filename)
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{
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FileStream fs = FileTools.TryOpenRead(filename);
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DatItem datItem = GetCHDInfo(fs);
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fs.Dispose();
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return datItem;
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}
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#endregion
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/// <summary>
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/// Get internal metadata from a CHD
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/// </summary>
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/// <param name="fs">Stream of possible CHD</param>
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/// <returns>A Disk object with internal SHA-1 on success, null on error, empty Disk otherwise</returns>
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/// <remarks>
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/// Original code had a "writable" param. This is not required for metadata checking
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/// </remarks>
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public static DatItem GetCHDInfo(Stream fs)
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{
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// Create a blank Disk to populate and return
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Disk datItem = new Disk();
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#region Instance Methods
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// Get a CHD object to store the data
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CHDFile chd = new CHDFile();
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// Get a binary reader to make life easier
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BinaryReader br = new BinaryReader(fs);
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// Read and verify the CHD signature
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chd.m_signature = br.ReadUInt64();
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if (chd.m_signature != Constants.CHDSignature)
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{
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// throw CHDERR_INVALID_FILE;
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return null;
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}
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// Get the header size and version
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chd.m_headersize = br.ReadUInt32();
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chd.m_version = br.ReadUInt32();
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// Create a placeholder for the extracted SHA-1
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byte[] sha1 = new byte[20];
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// If we have a CHD v3 file, parse it accordingly
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if (chd.m_headersize == Constants.CHD_V3_HEADER_SIZE && chd.m_version == 3)
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{
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sha1 = chd.ParseCHDv3Header(br);
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}
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// If we have a CHD v4 file, parse it accordingly
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else if (chd.m_headersize == Constants.CHD_V4_HEADER_SIZE && chd.m_version == 4)
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{
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sha1 = chd.ParseCHDv4Header(br);
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}
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// If we have a CHD v5 file, parse it accordingly
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else if (chd.m_headersize == Constants.CHD_V5_HEADER_SIZE && chd.m_version == 5)
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{
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sha1 = chd.ParseCHDv5Header(br);
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}
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// If we don't have a valid combination, return null
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else
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{
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// throw CHDERR_UNSUPPORTED_VERSION;
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// throw CHDERR_INVALID_FILE;
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return null;
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}
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// Set the SHA-1 of the Disk to return
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datItem.SHA1 = BitConverter.ToString(sha1).Replace("-", string.Empty).ToLowerInvariant();
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return datItem;
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}
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/// <summary>
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/// Get if file is a valid CHD
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/// </summary>
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/// <param name="filename">Filename of possible CHD</param>
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/// <returns>True if a the file is a valid CHD, false otherwise</returns>
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public static bool IsValidCHD(string filename)
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{
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DatItem datItem = GetCHDInfo(filename);
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return datItem != null
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&& datItem.Type == ItemType.Disk
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&& ((Disk)datItem).SHA1 != null;
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}
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/// <summary>
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/// Get if stream is a valid CHD
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/// </summary>
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/// <param name="fs">Stream of possible CHD</param>
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/// <returns>True if a the file is a valid CHD, false otherwise</returns>
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public static bool IsValidCHD(Stream fs)
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{
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DatItem datItem = GetCHDInfo(fs);
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return datItem != null
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&& datItem.Type == ItemType.Disk
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&& ((Disk)datItem).SHA1 != null;
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}
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#region Header Parsing
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/// <summary>
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/// Parse a CHD v3 header
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@@ -311,5 +214,126 @@ namespace SabreTools.Library.External
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sha1 = br.ReadBytes(20);
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return sha1;
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}
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#endregion
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#endregion // Instance Methods
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#region Static Methods
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#region File Information
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/// <summary>
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/// Get internal metadata from a CHD
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/// </summary>
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/// <param name="filename">Filename of possible CHD</param>
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/// <returns>A Disk object with internal SHA-1 on success, null on error, empty Disk otherwise</returns>
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/// <remarks>
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/// Original code had a "writable" param. This is not required for metadata checking
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/// </remarks>
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public static DatItem GetCHDInfo(string filename)
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{
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FileStream fs = FileTools.TryOpenRead(filename);
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DatItem datItem = GetCHDInfo(fs);
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fs.Dispose();
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return datItem;
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}
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/// <summary>
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/// Get if file is a valid CHD
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/// </summary>
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/// <param name="filename">Filename of possible CHD</param>
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/// <returns>True if a the file is a valid CHD, false otherwise</returns>
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public static bool IsValidCHD(string filename)
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{
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DatItem datItem = GetCHDInfo(filename);
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return datItem != null
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&& datItem.Type == ItemType.Disk
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&& ((Disk)datItem).SHA1 != null;
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}
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#endregion
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#region Stream Information
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/// <summary>
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/// Get internal metadata from a CHD
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/// </summary>
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/// <param name="fs">Stream of possible CHD</param>
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/// <returns>A Disk object with internal SHA-1 on success, null on error, empty Disk otherwise</returns>
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/// <remarks>
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/// Original code had a "writable" param. This is not required for metadata checking
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/// </remarks>
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public static DatItem GetCHDInfo(Stream fs)
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{
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// Create a blank Disk to populate and return
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Disk datItem = new Disk();
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// Get a CHD object to store the data
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CHDFile chd = new CHDFile();
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// Get a binary reader to make life easier
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BinaryReader br = new BinaryReader(fs);
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// Read and verify the CHD signature
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chd.m_signature = br.ReadUInt64();
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if (chd.m_signature != Constants.CHDSignature)
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{
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// throw CHDERR_INVALID_FILE;
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return null;
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}
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// Get the header size and version
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chd.m_headersize = br.ReadUInt32();
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chd.m_version = br.ReadUInt32();
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// Create a placeholder for the extracted SHA-1
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byte[] sha1 = new byte[20];
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// If we have a CHD v3 file, parse it accordingly
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if (chd.m_headersize == Constants.CHD_V3_HEADER_SIZE && chd.m_version == 3)
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{
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sha1 = chd.ParseCHDv3Header(br);
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}
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// If we have a CHD v4 file, parse it accordingly
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else if (chd.m_headersize == Constants.CHD_V4_HEADER_SIZE && chd.m_version == 4)
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{
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sha1 = chd.ParseCHDv4Header(br);
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}
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// If we have a CHD v5 file, parse it accordingly
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else if (chd.m_headersize == Constants.CHD_V5_HEADER_SIZE && chd.m_version == 5)
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{
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sha1 = chd.ParseCHDv5Header(br);
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}
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// If we don't have a valid combination, return null
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else
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{
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// throw CHDERR_UNSUPPORTED_VERSION;
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// throw CHDERR_INVALID_FILE;
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return null;
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}
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// Set the SHA-1 of the Disk to return
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datItem.SHA1 = BitConverter.ToString(sha1).Replace("-", string.Empty).ToLowerInvariant();
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return datItem;
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}
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/// <summary>
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/// Get if stream is a valid CHD
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/// </summary>
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/// <param name="fs">Stream of possible CHD</param>
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/// <returns>True if a the file is a valid CHD, false otherwise</returns>
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public static bool IsValidCHD(Stream fs)
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{
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DatItem datItem = GetCHDInfo(fs);
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return datItem != null
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&& datItem.Type == ItemType.Disk
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&& ((Disk)datItem).SHA1 != null;
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}
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#endregion
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#endregion //Static Methods
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}
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}
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