Create 2272 release branch for CEF3.

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/2272@1993 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef_dll/wrapper/cef_byte_read_handler.cc

@@ -0,0 +1,66 @@
+// Copyright (c) 2010 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+
+#include "include/wrapper/cef_byte_read_handler.h"
+
+#include <algorithm>
+#include <cstdio>
+#include <cstdlib>
+
+CefByteReadHandler::CefByteReadHandler(const unsigned char* bytes, size_t size,
+                                       CefRefPtr<CefBase> source)
+  : bytes_(bytes), size_(size), offset_(0), source_(source) {
+}
+
+size_t CefByteReadHandler::Read(void* ptr, size_t size, size_t n) {
+  base::AutoLock lock_scope(lock_);
+  size_t s = static_cast<size_t>(size_ - offset_) / size;
+  size_t ret = std::min(n, s);
+  memcpy(ptr, bytes_ + offset_, ret * size);
+  offset_ += ret * size;
+  return ret;
+}
+
+int CefByteReadHandler::Seek(int64 offset, int whence) {
+  int rv = -1L;
+  base::AutoLock lock_scope(lock_);
+  switch (whence) {
+  case SEEK_CUR:
+    if (offset_ + offset > size_ || offset_ + offset < 0)
+      break;
+    offset_ += offset;
+    rv = 0;
+    break;
+  case SEEK_END: {
+#if defined(OS_WIN)
+    int64 offset_abs = _abs64(offset);
+#else
+    int64 offset_abs = std::abs(offset);
+#endif
+    if (offset_abs > size_)
+      break;
+    offset_ = size_ - offset_abs;
+    rv = 0;
+    break;
+  }
+  case SEEK_SET:
+    if (offset > size_ || offset < 0)
+      break;
+    offset_ = offset;
+    rv = 0;
+    break;
+  }
+
+  return rv;
+}
+
+int64 CefByteReadHandler::Tell() {
+  base::AutoLock lock_scope(lock_);
+  return offset_;
+}
+
+int CefByteReadHandler::Eof() {
+  base::AutoLock lock_scope(lock_);
+  return (offset_ >= size_);
+}