[Scummvm-cvs-logs] SF.net SVN: scummvm:[49750] scummvm/trunk/common

[sev at users.sourceforge.net]

Revision: 49750
          http://scummvm.svn.sourceforge.net/scummvm/?rev=49750&view=rev
Author:   sev
Date:     2010-06-15 10:34:14 +0000 (Tue, 15 Jun 2010)

Log Message:
-----------
Added seek() method to MemoryWriteStreamDynamic.

If it deserves a separate class, shout.

Modified Paths:
--------------
    scummvm/trunk/common/stream.cpp
    scummvm/trunk/common/stream.h

Modified: scummvm/trunk/common/stream.cpp
===================================================================
--- scummvm/trunk/common/stream.cpp	2010-06-15 10:33:57 UTC (rev 49749)
+++ scummvm/trunk/common/stream.cpp	2010-06-15 10:34:14 UTC (rev 49750)
@@ -303,4 +303,29 @@
 	return true;	// FIXME: STREAM REWRITE
 }
 
+bool MemoryWriteStreamDynamic::seek(int32 offs, int whence) {
+	// Pre-Condition
+	assert(_pos <= _size);
+	switch (whence) {
+	case SEEK_END:
+		// SEEK_END works just like SEEK_SET, only 'reversed',
+		// i.e. from the end.
+		offs = _size + offs;
+		// Fall through
+	case SEEK_SET:
+		_ptr = _data + offs;
+		_pos = offs;
+		break;
+
+	case SEEK_CUR:
+		_ptr += offs;
+		_pos += offs;
+		break;
+	}
+	// Post-Condition
+	assert(_pos <= _size);
+
+	return true;	// FIXME: STREAM REWRITE
+}
+
 }	// End of namespace Common

Modified: scummvm/trunk/common/stream.h
===================================================================
--- scummvm/trunk/common/stream.h	2010-06-15 10:33:57 UTC (rev 49749)
+++ scummvm/trunk/common/stream.h	2010-06-15 10:34:14 UTC (rev 49750)
@@ -687,6 +687,8 @@
 	uint32 size() const { return _size; }
 
 	byte *getData() { return _data; }
+
+	bool seek(int32 offset, int whence = SEEK_SET);
 };
 
 }	// End of namespace Common


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