/// <summary>
/// Writes a variant value To an output stream. This method ensures that
/// always a multiple of 4 bytes is written.
/// If the codepage is UTF-16, which is encouraged, strings
/// <strong>must</strong> always be written as {@link Variant#VT_LPWSTR}
/// strings, not as {@link Variant#VT_LPSTR} strings. This method ensure this
/// by Converting strings appropriately, if needed.
/// </summary>
/// <param name="out1">The stream To Write the value To.</param>
/// <param name="type">The variant's type.</param>
/// <param name="value">The variant's value.</param>
/// <param name="codepage">The codepage To use To Write non-wide strings</param>
/// <returns>The number of entities that have been written. In many cases an
/// "entity" is a byte but this is not always the case.</returns>
public static int Write(Stream out1, long type,
Object value, int codepage)
{
int length = 0;
switch ((int)type)
{
case Variant.VT_BOOL:
{
byte[] data = new byte[2];
if ((bool)value)
{
out1.WriteByte(0xFF);
out1.WriteByte(0xFF);
}
else
{
out1.WriteByte(0x00);
out1.WriteByte(0x00);
}
length += 2;
break;
}
case Variant.VT_LPSTR:
{
CodePageString codePageString = new CodePageString((String)value,
codepage);
length += codePageString.Write(out1);
break;
}
case Variant.VT_LPWSTR:
{
int nrOfChars = ((String)value).Length + 1;
length += TypeWriter.WriteUIntToStream(out1, (uint)nrOfChars);
char[] s = ((String)value).ToCharArray();
for (int i = 0; i < s.Length; i++)
{
int high = ((s[i] & 0x0000ff00) >> 8);
int low = (s[i] & 0x000000ff);
byte highb = (byte)high;
byte lowb = (byte)low;
out1.WriteByte(lowb);
out1.WriteByte(highb);
length += 2;
}
// NullTerminator
out1.WriteByte(0x00);
out1.WriteByte(0x00);
length += 2;
break;
}
case Variant.VT_CF:
{
byte[] b = (byte[])value;
out1.Write(b, 0, b.Length);
length = b.Length;
break;
}
case Variant.VT_EMPTY:
{
length += TypeWriter.WriteUIntToStream(out1, Variant.VT_EMPTY);
break;
}
case Variant.VT_I2:
{
short x;
try
{
x = Convert.ToInt16(value, CultureInfo.InvariantCulture);
}
catch (OverflowException)
{
x = (short)((int)value);
}
length += TypeWriter.WriteToStream(out1, x);
//length = LittleEndianConsts.SHORT_SIZE;
break;
}
case Variant.VT_I4:
{
if (!(value is int))
{
throw new Exception("Could not cast an object To "
+ "int" + ": "
+ value.GetType().Name + ", "
+ value.ToString());
}
length += TypeWriter.WriteToStream(out1, (int)value);
break;
}
case Variant.VT_I8:
{
length += TypeWriter.WriteToStream(out1, Convert.ToInt64(value, CultureInfo.CurrentCulture));
break;
}
case Variant.VT_R8:
{
length += TypeWriter.WriteToStream(out1,
(Double)value);
break;
}
case Variant.VT_FILETIME:
{
long filetime;
if (value != null)
{
filetime = Util.DateToFileTime((DateTime)value);
}
else
{
filetime = 0;
}
int high = (int)((filetime >> 32) & 0x00000000FFFFFFFFL);
int low = (int)(filetime & 0x00000000FFFFFFFFL);
Filetime filetimeValue = new Filetime(low, high);
length += filetimeValue.Write(out1);
//length += TypeWriter.WriteUIntToStream
// (out1, (uint)(0x0000000FFFFFFFFL & low));
//length += TypeWriter.WriteUIntToStream
// (out1, (uint)(0x0000000FFFFFFFFL & high));
break;
}
default:
{
/* The variant type is not supported yet. However, if the value
* is a byte array we can Write it nevertheless. */
if (value is byte[])
{
byte[] b = (byte[])value;
out1.Write(b, 0, b.Length);
length = b.Length;
WriteUnsupportedTypeMessage
(new WritingNotSupportedException(type, value));
}
else
{
throw new WritingNotSupportedException(type, value);
}
break;
}
}
/* pad values to 4-bytes */
while ((length & 0x3) != 0)
{
out1.WriteByte(0x00);
length++;
}
return(length);
}
/// <summary>
/// Reads a variant type from a byte array
/// </summary>
/// <param name="src">The byte array</param>
/// <param name="offset">The offset in the byte array where the variant starts</param>
/// <param name="length">The Length of the variant including the variant type field</param>
/// <param name="type">The variant type To Read</param>
/// <param name="codepage">The codepage To use for non-wide strings</param>
/// <returns>A Java object that corresponds best To the variant field. For
/// example, a VT_I4 is returned as a {@link long}, a VT_LPSTR as a
/// {@link String}.</returns>
public static Object Read(byte[] src, int offset,
int length, long type, int codepage)
{
TypedPropertyValue typedPropertyValue = new TypedPropertyValue(
(int)type, null);
int unpadded;
try
{
unpadded = typedPropertyValue.ReadValue(src, offset);
}
catch (InvalidOperationException)
{
int propLength = Math.Min(length, src.Length - offset);
byte[] v = new byte[propLength];
System.Array.Copy(src, offset, v, 0, propLength);
throw new ReadingNotSupportedException(type, v);
}
switch ((int)type)
{
case Variant.VT_EMPTY:
case Variant.VT_I4:
case Variant.VT_I8:
case Variant.VT_R8:
/*
* we have more property types that can be converted into Java
* objects, but current API need to be preserved, and it returns
* other types as byte arrays. In future major versions it shall be
* changed -- sergey
*/
return(typedPropertyValue.Value);
case Variant.VT_I2:
{
/*
* also for backward-compatibility with prev. versions of POI
* --sergey
*/
return((short)typedPropertyValue.Value);
}
case Variant.VT_FILETIME:
{
Filetime filetime = (Filetime)typedPropertyValue.Value;
return(Util.FiletimeToDate((int)filetime.High,
(int)filetime.Low));
}
case Variant.VT_LPSTR:
{
CodePageString string1 = (CodePageString)typedPropertyValue.Value;
return(string1.GetJavaValue(codepage));
}
case Variant.VT_LPWSTR:
{
UnicodeString string1 = (UnicodeString)typedPropertyValue.Value;
return(string1.ToJavaString());
}
case Variant.VT_CF:
{
// if(l1 < 0) {
/*
* YK: reading the ClipboardData packet (VT_CF) is not quite
* correct. The size of the data is determined by the first four
* bytes of the packet while the current implementation calculates
* it in the Section constructor. Test files in Bugzilla 42726 and
* 45583 clearly show that this approach does not always work. The
* workaround below attempts to gracefully handle such cases instead
* of throwing exceptions.
*
* August 20, 2009
*/
// l1 = LittleEndian.getInt(src, o1); o1 += LittleEndian.INT_SIZE;
// }
// final byte[] v = new byte[l1];
// System.arraycopy(src, o1, v, 0, v.length);
// value = v;
// break;
ClipboardData clipboardData = (ClipboardData)typedPropertyValue.Value;
return(clipboardData.ToByteArray());
}
case Variant.VT_BOOL:
{
VariantBool bool1 = (VariantBool)typedPropertyValue.Value;
return((bool)bool1.Value);
}
default:
{
/*
* it is not very good, but what can do without breaking current
* API? --sergey
*/
byte[] v = new byte[unpadded];
System.Array.Copy(src, offset, v, 0, unpadded);
throw new ReadingNotSupportedException(type, v);
}
}
}