S3M+IT: fix reading, IT: untested support for message writing

IT: reading was off starting with global volume because of wrong read size.
S3M+IT: correctly read the number of used patterns.
IT: fixed reading of message tag and implemented writing of message tag
(not tested yet).

I also added S3M+IT test files. TODO: Unit tests using them.

1 files changed, 26 insertions, 0 deletions

diff --git a/taglib/mod/modfilebase.cpp b/taglib/mod/modfilebase.cpp
index 66df3857..e074dac8 100644
--- a/taglib/mod/modfilebase.cpp
+++ b/taglib/mod/modfilebase.cpp
@@ -55,6 +55,32 @@ bool Mod::FileBase::readString(String &s, ulong size)
   return true;
 }
 
+void Mod::FileBase::writeByte(uchar byte)
+{
+  ByteVector data(1, byte);
+  writeBlock(data);
+}
+
+void Mod::FileBase::writeU16L(ushort number)
+{
+  writeBlock(ByteVector::fromShort(number, false));
+}
+
+void Mod::FileBase::writeU32L(ulong number)
+{
+  writeBlock(ByteVector::fromUInt(number, false));
+}
+
+void Mod::FileBase::writeU16B(ushort number)
+{
+  writeBlock(ByteVector::fromShort(number, true));
+}
+
+void Mod::FileBase::writeU32B(ulong number)
+{
+  writeBlock(ByteVector::fromUInt(number, true));
+}
+
 bool Mod::FileBase::readByte(uchar &byte)
 {
   ByteVector data(readBlock(1));