fix(Foundation): Poco::BasicMemoryStreamBuf is missing seekpos() #4492

pocoproject · Mar 22, 2024 · 5fec3de · 5fec3de
1 parent 77eb14e
commit 5fec3de
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diff --git a/Foundation/include/Poco/MemoryStream.h b/Foundation/include/Poco/MemoryStream.h
@@ -140,6 +140,12 @@ class BasicMemoryStreamBuf: public std::basic_streambuf<ch, tr>
 
 		return newoff;
 	}
+
+	virtual pos_type seekpos(pos_type pos, std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
+	{
+		const off_type off = pos;
+		return seekoff(off, std::ios::beg, which);
+	}
 
 	virtual int sync()
 	{

diff --git a/Foundation/testsuite/src/MemoryStreamTest.cpp b/Foundation/testsuite/src/MemoryStreamTest.cpp
@@ -143,6 +143,14 @@ void MemoryStreamTest::testInputSeek()
 	assertTrue (istr.good());
 	assertTrue (9 == istr.tellg());
 
+
+	istr.seekg(5);
+	assertTrue (istr.good());
+	assertTrue (5 == istr.tellg());
+	istr >> c;
+	assertTrue (c == '6');
+
+
 	{
 		Poco::MemoryInputStream istr2(buffer.begin(), buffer.size());
 		istr2.seekg(10, std::ios_base::beg);
@@ -337,6 +345,12 @@ void MemoryStreamTest::testOutputSeek()
 	assertTrue (ostr.good());
 	assertTrue (9 == ostr.tellp());
 
+
+	ostr.seekp(5);
+	assertTrue (ostr.good());
+	assertTrue (5 == ostr.tellp());
+
+
 	{
 		Poco::MemoryOutputStream ostr2(buffer.begin(), buffer.size());
 		ostr2.seekp(10, std::ios_base::beg);