most of JHostIO / m_Do_hostIO done (#2288)

1 files changed, 50 insertions, 1 deletions

diff --git a/src/JSystem/JSupport/JSUMemoryStream.cpp b/src/JSystem/JSupport/JSUMemoryStream.cpp
index 0b5f1bc062..494c343313 100644
--- a/src/JSystem/JSupport/JSUMemoryStream.cpp
+++ b/src/JSystem/JSupport/JSUMemoryStream.cpp
@@ -63,4 +63,53 @@ s32 JSUMemoryInputStream::getLength() const {
 /* 802DC630-802DC638 2D6F70 0008+00 1/0 0/0 0/0 .text getPosition__20JSUMemoryInputStreamCFv */
 s32 JSUMemoryInputStream::getPosition() const {
     return mPosition;
-}
\ No newline at end of file
+}
+
+void JSUMemoryOutputStream::setBuffer(void* pBuffer, s32 length) {
+    mBuffer = pBuffer;
+    mLength = length;
+    mPosition = 0;
+}
+
+s32 JSUMemoryOutputStream::writeData(const void* pData, s32 length) {
+    if (mPosition + length > mLength) {
+        length = mLength - mPosition;
+    }
+
+    if (length > 0) {
+        memcpy((void*)((s32)mBuffer + mPosition), pData, length);
+        mPosition += length;
+    }
+
+    return length;
+}
+
+s32 JSUMemoryOutputStream::seekPos(s32 pos, JSUStreamSeekFrom seekFrom) {
+    s32 oldPos = mPosition;
+
+    switch (seekFrom) {
+    case JSUStreamSeekFrom_SET:
+        mPosition = pos;
+        break;
+    case JSUStreamSeekFrom_END:
+        mPosition = mLength - pos;
+        break;
+    case JSUStreamSeekFrom_CUR:
+        mPosition += pos;
+        break;
+    }
+
+    if (mPosition < 0) {
+        mPosition = 0;
+    }
+
+    if (mPosition > mLength) {
+        mPosition = mLength;
+    }
+
+    return mPosition - oldPos;
+}
+
+s32 JSUMemoryOutputStream::getLength() const {
+    return mLength;
+}