/// <summary>Gets all of the attributes on a file.</summary>
/// <returns>A collection of the attributes from the file.</returns>
public override System.Collections.IDictionary GetAttributes()
{
if (_editor == null)
{
throw new ObjectDisposedException(GetType().Name);
}
Hashtable propsRetrieved = new Hashtable();
// Get the number of attributes
ushort attributeCount = _editor.GetAttributeCount(0);
// Get each attribute by index
for (ushort i = 0; i < attributeCount; i++)
{
MetadataItemType attributeType;
StringBuilder attributeName = null;
byte[] attributeValue = null;
ushort attributeNameLength = 0;
ushort attributeValueLength = 0;
// Get the lengths of the name and the value, then use them to create buffers to receive them
uint reserved = 0;
_editor.GetAttributeByIndex(i, ref reserved, attributeName, ref attributeNameLength,
out attributeType, attributeValue, ref attributeValueLength);
attributeName = new StringBuilder(attributeNameLength);
attributeValue = new byte[attributeValueLength];
// Get the name and value
_editor.GetAttributeByIndex(i, ref reserved, attributeName, ref attributeNameLength,
out attributeType, attributeValue, ref attributeValueLength);
// If we got a name, parse the value and add the metadata item
if (attributeName != null && attributeName.Length > 0)
{
object val = ParseAttributeValue(attributeType, attributeValue);
string key = attributeName.ToString().TrimEnd('\0');
propsRetrieved[key] = new MetadataItem(key, val, attributeType);
}
}
// Return the parsed items
return(propsRetrieved);
}
/// <summary>Converts a value to the target type and gets its byte representation.</summary>
/// <param name="item">The item whose value is to be translated.</param>
/// <param name="valueData">The output byte array.</param>
protected static bool TranslateAttributeToByteArray(MetadataItem item, out byte [] valueData)
{
int valueLength;
switch (item.Type)
{
case MetadataItemType.Dword:
valueData = BitConverter.GetBytes((int)item.Value);
return(true);
case MetadataItemType.Word:
valueData = BitConverter.GetBytes((short)item.Value);
return(true);
case MetadataItemType.Qword:
valueData = BitConverter.GetBytes((long)item.Value);
return(true);
case MetadataItemType.Boolean:
valueData = BitConverter.GetBytes(((bool)item.Value) ? 1 : 0);
return(true);
case MetadataItemType.String:
string strValue = item.Value.ToString();
valueLength = (strValue.Length + 1) * 2; // plus 1 for null-term, times 2 for unicode
valueData = new byte[valueLength];
Buffer.BlockCopy(strValue.ToCharArray(), 0, valueData, 0, strValue.Length * 2);
valueData[valueLength - 2] = 0;
valueData[valueLength - 1] = 0;
return(true);
default:
valueData = null;
return(false);
}
}
/// <summary>Gets all of the attributes on a file.</summary>
/// <returns>A collection of the attributes from the file.</returns>
public override System.Collections.IDictionary GetAttributes()
{
if (_editor == null) throw new ObjectDisposedException(GetType().Name);
Hashtable propsRetrieved = new Hashtable();
// Get the number of attributes
ushort attributeCount = _editor.GetAttributeCount(0);
// Get each attribute by index
for(ushort i = 0; i < attributeCount; i++)
{
MetadataItemType attributeType;
StringBuilder attributeName = null;
byte[] attributeValue = null;
ushort attributeNameLength = 0;
ushort attributeValueLength = 0;
// Get the lengths of the name and the value, then use them to create buffers to receive them
uint reserved = 0;
_editor.GetAttributeByIndex(i, ref reserved, attributeName, ref attributeNameLength,
out attributeType, attributeValue, ref attributeValueLength);
attributeName = new StringBuilder(attributeNameLength);
attributeValue = new byte[attributeValueLength];
// Get the name and value
_editor.GetAttributeByIndex(i, ref reserved, attributeName, ref attributeNameLength,
out attributeType, attributeValue, ref attributeValueLength);
// If we got a name, parse the value and add the metadata item
if (attributeName != null && attributeName.Length > 0)
{
object val = ParseAttributeValue(attributeType, attributeValue);
string key = attributeName.ToString().TrimEnd('\0');
propsRetrieved[key] = new MetadataItem(key, val, attributeType);
}
}
// Return the parsed items
return propsRetrieved;
}
/// <summary>Sets the value of a string attribute.</summary>
/// <param name="items">The metadata items collection.</param>
/// <param name="name">The name of the attribute.</param>
/// <param name="value">The new value of the attribute.</param>
public static void SetMetadataItemAsString(IDictionary items, string name, string value)
{
items[name] = new MetadataItem(name, value, MetadataItemType.String);
}
/// <summary>Converts a value to the target type and gets its byte representation.</summary>
/// <param name="item">The item whose value is to be translated.</param>
/// <param name="valueData">The output byte array.</param>
protected static bool TranslateAttributeToByteArray(MetadataItem item, out byte [] valueData)
{
int valueLength;
switch(item.Type)
{
case MetadataItemType.Dword:
valueData = BitConverter.GetBytes((int)item.Value);
return true;
case MetadataItemType.Word:
valueData = BitConverter.GetBytes((short)item.Value);
return true;
case MetadataItemType.Qword:
valueData = BitConverter.GetBytes((long)item.Value);
return true;
case MetadataItemType.Boolean:
valueData = BitConverter.GetBytes(((bool)item.Value) ? 1 : 0 );
return true;
case MetadataItemType.String:
string strValue = item.Value.ToString();
valueLength = (strValue.Length + 1) * 2; // plus 1 for null-term, times 2 for unicode
valueData = new byte[valueLength];
Buffer.BlockCopy(strValue.ToCharArray(), 0, valueData, 0, strValue.Length * 2);
valueData[valueLength - 2] = 0;
valueData[valueLength - 1] = 0;
return true;
default:
valueData = null;
return false;
}
}
/// <summary>Sets the value of a string attribute.</summary>
/// <param name="items">The metadata items collection.</param>
/// <param name="name">The name of the attribute.</param>
/// <param name="value">The new value of the attribute.</param>
public static void SetMetadataItemAsString(IDictionary items, string name, string value)
{
items[name] = new MetadataItem(name, value, MetadataItemType.String);
}
