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[CHDFile] Make versions more invisible

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This commit is contained in:
Matt Nadareski
2017-10-31 09:59:09 -07:00
parent fa1284c707
commit 80f8778be9
1 changed files with 51 additions and 27 deletions
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78
SabreTools.Library/External/CHDFile.cs vendored
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@@ -120,6 +120,9 @@ namespace SabreTools.Library.External
/// <returns>Unsigned int containing the version number, null if invalid</returns>
public uint? ValidateHeaderVersion()
{
// Seek to the beginning to make sure we're reading the correct bytes
m_br.BaseStream.Seek(0, SeekOrigin.Begin);
// Read and verify the CHD signature
m_signature = m_br.ReadUInt64();
if (m_signature != Constants.CHDSignature)
@@ -145,12 +148,48 @@ namespace SabreTools.Library.External
return m_version;
}
/// <summary>
/// Get the internal SHA-1 from the CHD
/// </summary>
/// <returns>SHA-1 as a byte array, null on error</returns>
public byte[] GetSHA1FromHeader()
{
// Validate the header by default just in case
uint? version = ValidateHeaderVersion();
// Now get the SHA-1 hash, if possible
byte[] sha1 = new byte[20];
// Now parse the rest of the header according to the version
switch (version)
{
case 3:
sha1 = ParseCHDv3Header();
break;
case 4:
sha1 = ParseCHDv4Header();
break;
case 5:
sha1 = ParseCHDv5Header();
break;
case null:
default:
// throw CHDERR_INVALID_FILE;
return null;
}
return sha1;
}
/// <summary>
/// Parse a CHD v3 header
/// </summary>
/// <returns>The extracted SHA-1 on success, null otherwise</returns>
public byte[] ParseCHDv3Header()
private byte[] ParseCHDv3Header()
{
// Seek to after the signature to make sure we're reading the correct bytes
m_br.BaseStream.Seek(8, SeekOrigin.Begin);
// Set the blank SHA-1 hash
byte[] sha1 = new byte[20];
@@ -194,8 +233,11 @@ namespace SabreTools.Library.External
/// Parse a CHD v4 header
/// </summary>
/// <returns>The extracted SHA-1 on success, null otherwise</returns>
public byte[] ParseCHDv4Header()
private byte[] ParseCHDv4Header()
{
// Seek to after the signature to make sure we're reading the correct bytes
m_br.BaseStream.Seek(8, SeekOrigin.Begin);
// Set the blank SHA-1 hash
byte[] sha1 = new byte[20];
@@ -238,8 +280,11 @@ namespace SabreTools.Library.External
/// Parse a CHD v5 header
/// </summary>
/// <returns>The extracted SHA-1 on success, null otherwise</returns>
public byte[] ParseCHDv5Header()
private byte[] ParseCHDv5Header()
{
// Seek to after the signature to make sure we're reading the correct bytes
m_br.BaseStream.Seek(8, SeekOrigin.Begin);
// Set the blank SHA-1 hash
byte[] sha1 = new byte[20];
@@ -324,32 +369,11 @@ namespace SabreTools.Library.External
// Get a CHD object to store the data
CHDFile chd = new CHDFile(fs);
// Get and validate the header version
uint? version = chd.ValidateHeaderVersion();
// Create a placeholder for the extracted SHA-1
byte[] sha1 = new byte[20];
// Now parse the rest of the header according to the version
switch (version)
{
case 3:
sha1 = chd.ParseCHDv3Header();
break;
case 4:
sha1 = chd.ParseCHDv4Header();
break;
case 5:
sha1 = chd.ParseCHDv5Header();
break;
case null:
default:
// throw CHDERR_INVALID_FILE;
return null;
}
// Get the SHA-1 from the chd
byte[] sha1 = chd.GetSHA1FromHeader();
// Set the SHA-1 of the Disk to return
datItem.SHA1 = BitConverter.ToString(sha1).Replace("-", string.Empty).ToLowerInvariant();
datItem.SHA1 = (sha1 == null ? null : BitConverter.ToString(sha1).Replace("-", string.Empty).ToLowerInvariant());
return datItem;
}