upload android base code part6

android/device/generic/goldfish-opengl/host/include/libOpenglRender/IOStream.h

@@ -0,0 +1,102 @@
+/*
+* Copyright (C) 2011 The Android Open Source Project
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+#ifndef __IO_STREAM_H__
+#define __IO_STREAM_H__
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "ErrorLog.h"
+
+class IOStream {
+public:
+
+    IOStream(size_t bufSize) {
+        m_buf = NULL;
+        m_bufsize = bufSize;
+        m_free = 0;
+    }
+
+    virtual void *allocBuffer(size_t minSize) = 0;
+    virtual int commitBuffer(size_t size) = 0;
+    virtual const unsigned char *readFully( void *buf, size_t len) = 0;
+    virtual const unsigned char *read( void *buf, size_t *inout_len) = 0;
+    virtual int writeFully(const void* buf, size_t len) = 0;
+
+    virtual ~IOStream() {
+
+        // NOTE: m_buf is 'owned' by the child class thus we expect it to be released by it
+    }
+
+    unsigned char *alloc(size_t len) {
+
+        if (m_buf && len > m_free) {
+            if (flush() < 0) {
+                ERR("Failed to flush in alloc\n");
+                return NULL; // we failed to flush so something is wrong
+            }
+        }
+
+        if (!m_buf || len > m_bufsize) {
+            int allocLen = m_bufsize < len ? len : m_bufsize;
+            m_buf = (unsigned char *)allocBuffer(allocLen);
+            if (!m_buf) {
+                ERR("Alloc (%u bytes) failed\n", allocLen);
+                return NULL;
+            }
+            m_bufsize = m_free = allocLen;
+        }
+
+        unsigned char *ptr;
+
+        ptr = m_buf + (m_bufsize - m_free);
+        m_free -= len;
+
+        return ptr;
+    }
+
+    int flush() {
+
+        if (!m_buf || m_free == m_bufsize) return 0;
+
+        int stat = commitBuffer(m_bufsize - m_free);
+        m_buf = NULL;
+        m_free = 0;
+        return stat;
+    }
+
+    const unsigned char *readback(void *buf, size_t len) {
+        flush();
+        return readFully(buf, len);
+    }
+
+
+private:
+    unsigned char *m_buf;
+    size_t m_bufsize;
+    size_t m_free;
+};
+
+//
+// When a client opens a connection to the renderer, it should
+// send unsigned int value indicating the "clientFlags".
+// The following are the bitmask of the clientFlags.
+// currently only one bit is used which flags the server
+// it should exit.
+//
+#define IOSTREAM_CLIENT_EXIT_SERVER      1
+
+#endif