Adds a modified copy of talk/base to webrtc/base. It is the first step in
migrating talk/base to webrtc/base.
BUG=N/A
R=niklas.enbom@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/17479005
git-svn-id: http://webrtc.googlecode.com/svn/trunk@6129 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/base/bytebuffer.cc b/webrtc/base/bytebuffer.cc
new file mode 100644
index 0000000..6133759
--- /dev/null
+++ b/webrtc/base/bytebuffer.cc
@@ -0,0 +1,234 @@
+/*
+ * Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/base/bytebuffer.h"
+
+#include <assert.h>
+#include <string.h>
+
+#include <algorithm>
+
+#include "webrtc/base/basictypes.h"
+#include "webrtc/base/byteorder.h"
+
+namespace rtc {
+
+static const int DEFAULT_SIZE = 4096;
+
+ByteBuffer::ByteBuffer() {
+ Construct(NULL, DEFAULT_SIZE, ORDER_NETWORK);
+}
+
+ByteBuffer::ByteBuffer(ByteOrder byte_order) {
+ Construct(NULL, DEFAULT_SIZE, byte_order);
+}
+
+ByteBuffer::ByteBuffer(const char* bytes, size_t len) {
+ Construct(bytes, len, ORDER_NETWORK);
+}
+
+ByteBuffer::ByteBuffer(const char* bytes, size_t len, ByteOrder byte_order) {
+ Construct(bytes, len, byte_order);
+}
+
+ByteBuffer::ByteBuffer(const char* bytes) {
+ Construct(bytes, strlen(bytes), ORDER_NETWORK);
+}
+
+void ByteBuffer::Construct(const char* bytes, size_t len,
+ ByteOrder byte_order) {
+ version_ = 0;
+ start_ = 0;
+ size_ = len;
+ byte_order_ = byte_order;
+ bytes_ = new char[size_];
+
+ if (bytes) {
+ end_ = len;
+ memcpy(bytes_, bytes, end_);
+ } else {
+ end_ = 0;
+ }
+}
+
+ByteBuffer::~ByteBuffer() {
+ delete[] bytes_;
+}
+
+bool ByteBuffer::ReadUInt8(uint8* val) {
+ if (!val) return false;
+
+ return ReadBytes(reinterpret_cast<char*>(val), 1);
+}
+
+bool ByteBuffer::ReadUInt16(uint16* val) {
+ if (!val) return false;
+
+ uint16 v;
+ if (!ReadBytes(reinterpret_cast<char*>(&v), 2)) {
+ return false;
+ } else {
+ *val = (byte_order_ == ORDER_NETWORK) ? NetworkToHost16(v) : v;
+ return true;
+ }
+}
+
+bool ByteBuffer::ReadUInt24(uint32* val) {
+ if (!val) return false;
+
+ uint32 v = 0;
+ char* read_into = reinterpret_cast<char*>(&v);
+ if (byte_order_ == ORDER_NETWORK || IsHostBigEndian()) {
+ ++read_into;
+ }
+
+ if (!ReadBytes(read_into, 3)) {
+ return false;
+ } else {
+ *val = (byte_order_ == ORDER_NETWORK) ? NetworkToHost32(v) : v;
+ return true;
+ }
+}
+
+bool ByteBuffer::ReadUInt32(uint32* val) {
+ if (!val) return false;
+
+ uint32 v;
+ if (!ReadBytes(reinterpret_cast<char*>(&v), 4)) {
+ return false;
+ } else {
+ *val = (byte_order_ == ORDER_NETWORK) ? NetworkToHost32(v) : v;
+ return true;
+ }
+}
+
+bool ByteBuffer::ReadUInt64(uint64* val) {
+ if (!val) return false;
+
+ uint64 v;
+ if (!ReadBytes(reinterpret_cast<char*>(&v), 8)) {
+ return false;
+ } else {
+ *val = (byte_order_ == ORDER_NETWORK) ? NetworkToHost64(v) : v;
+ return true;
+ }
+}
+
+bool ByteBuffer::ReadString(std::string* val, size_t len) {
+ if (!val) return false;
+
+ if (len > Length()) {
+ return false;
+ } else {
+ val->append(bytes_ + start_, len);
+ start_ += len;
+ return true;
+ }
+}
+
+bool ByteBuffer::ReadBytes(char* val, size_t len) {
+ if (len > Length()) {
+ return false;
+ } else {
+ memcpy(val, bytes_ + start_, len);
+ start_ += len;
+ return true;
+ }
+}
+
+void ByteBuffer::WriteUInt8(uint8 val) {
+ WriteBytes(reinterpret_cast<const char*>(&val), 1);
+}
+
+void ByteBuffer::WriteUInt16(uint16 val) {
+ uint16 v = (byte_order_ == ORDER_NETWORK) ? HostToNetwork16(val) : val;
+ WriteBytes(reinterpret_cast<const char*>(&v), 2);
+}
+
+void ByteBuffer::WriteUInt24(uint32 val) {
+ uint32 v = (byte_order_ == ORDER_NETWORK) ? HostToNetwork32(val) : val;
+ char* start = reinterpret_cast<char*>(&v);
+ if (byte_order_ == ORDER_NETWORK || IsHostBigEndian()) {
+ ++start;
+ }
+ WriteBytes(start, 3);
+}
+
+void ByteBuffer::WriteUInt32(uint32 val) {
+ uint32 v = (byte_order_ == ORDER_NETWORK) ? HostToNetwork32(val) : val;
+ WriteBytes(reinterpret_cast<const char*>(&v), 4);
+}
+
+void ByteBuffer::WriteUInt64(uint64 val) {
+ uint64 v = (byte_order_ == ORDER_NETWORK) ? HostToNetwork64(val) : val;
+ WriteBytes(reinterpret_cast<const char*>(&v), 8);
+}
+
+void ByteBuffer::WriteString(const std::string& val) {
+ WriteBytes(val.c_str(), val.size());
+}
+
+void ByteBuffer::WriteBytes(const char* val, size_t len) {
+ memcpy(ReserveWriteBuffer(len), val, len);
+}
+
+char* ByteBuffer::ReserveWriteBuffer(size_t len) {
+ if (Length() + len > Capacity())
+ Resize(Length() + len);
+
+ char* start = bytes_ + end_;
+ end_ += len;
+ return start;
+}
+
+void ByteBuffer::Resize(size_t size) {
+ size_t len = _min(end_ - start_, size);
+ if (size <= size_) {
+ // Don't reallocate, just move data backwards
+ memmove(bytes_, bytes_ + start_, len);
+ } else {
+ // Reallocate a larger buffer.
+ size_ = _max(size, 3 * size_ / 2);
+ char* new_bytes = new char[size_];
+ memcpy(new_bytes, bytes_ + start_, len);
+ delete [] bytes_;
+ bytes_ = new_bytes;
+ }
+ start_ = 0;
+ end_ = len;
+ ++version_;
+}
+
+bool ByteBuffer::Consume(size_t size) {
+ if (size > Length())
+ return false;
+ start_ += size;
+ return true;
+}
+
+ByteBuffer::ReadPosition ByteBuffer::GetReadPosition() const {
+ return ReadPosition(start_, version_);
+}
+
+bool ByteBuffer::SetReadPosition(const ReadPosition &position) {
+ if (position.version_ != version_) {
+ return false;
+ }
+ start_ = position.start_;
+ return true;
+}
+
+void ByteBuffer::Clear() {
+ memset(bytes_, 0, size_);
+ start_ = end_ = 0;
+ ++version_;
+}
+
+} // namespace rtc