Adds trunk/talk folder of revision 359 from libjingles google code to

trunk/talk


git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/base/buffer.h

@@ -0,0 +1,119 @@
+/*
+ * libjingle
+ * Copyright 2004-2010, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TALK_BASE_BUFFER_H_
+#define TALK_BASE_BUFFER_H_
+
+#include <cstring>
+
+#include "talk/base/scoped_ptr.h"
+
+namespace talk_base {
+
+// Basic buffer class, can be grown and shrunk dynamically.
+// Unlike std::string/vector, does not initialize data when expanding capacity.
+class Buffer {
+ public:
+  Buffer() {
+    Construct(NULL, 0, 0);
+  }
+  Buffer(const void* data, size_t length) {
+    Construct(data, length, length);
+  }
+  Buffer(const void* data, size_t length, size_t capacity) {
+    Construct(data, length, capacity);
+  }
+  Buffer(const Buffer& buf) {
+    Construct(buf.data(), buf.length(), buf.length());
+  }
+
+  const char* data() const { return data_.get(); }
+  char* data() { return data_.get(); }
+  // TODO: should this be size(), like STL?
+  size_t length() const { return length_; }
+  size_t capacity() const { return capacity_; }
+
+  Buffer& operator=(const Buffer& buf) {
+    if (&buf != this) {
+      Construct(buf.data(), buf.length(), buf.length());
+    }
+    return *this;
+  }
+  bool operator==(const Buffer& buf) const {
+    return (length_ == buf.length() &&
+            memcmp(data_.get(), buf.data(), length_) == 0);
+  }
+  bool operator!=(const Buffer& buf) const {
+    return !operator==(buf);
+  }
+
+  void SetData(const void* data, size_t length) {
+    ASSERT(data != NULL || length == 0);
+    SetLength(length);
+    memcpy(data_.get(), data, length);
+  }
+  void AppendData(const void* data, size_t length) {
+    ASSERT(data != NULL || length == 0);
+    size_t old_length = length_;
+    SetLength(length_ + length);
+    memcpy(data_.get() + old_length, data, length);
+  }
+  void SetLength(size_t length) {
+    SetCapacity(length);
+    length_ = length;
+  }
+  void SetCapacity(size_t capacity) {
+    if (capacity > capacity_) {
+      talk_base::scoped_array<char> data(new char[capacity]);
+      memcpy(data.get(), data_.get(), length_);
+      data_.swap(data);
+      capacity_ = capacity;
+    }
+  }
+
+  void TransferTo(Buffer* buf) {
+    ASSERT(buf != NULL);
+    buf->data_.reset(data_.release());
+    buf->length_ = length_;
+    buf->capacity_ = capacity_;
+    Construct(NULL, 0, 0);
+  }
+
+ protected:
+  void Construct(const void* data, size_t length, size_t capacity) {
+    data_.reset(new char[capacity_ = capacity]);
+    SetData(data, length);
+  }
+
+  scoped_array<char> data_;
+  size_t length_;
+  size_t capacity_;
+};
+
+}  // namespace talk_base
+
+#endif  // TALK_BASE_BUFFER_H_