Remove now unused Balsa code.

net/tools/balsa/simple_buffer.cc

-// Copyright 2013 The Chromium 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 "net/tools/balsa/simple_buffer.h"
-#include "base/logging.h"
-
-// Some of the following member functions are marked inlined, even though they
-// are virtual. This may seem counter-intuitive, since virtual functions are
-// generally not eligible for inlining. Profiling results indicate that these
-// large amount of runtime is spent on virtual function dispatch on these
-// simple functions. They are virtual because of the interface this class
-// inherits from. However, it is very unlikely that anyone will sub-class
-// SimpleBuffer and change their implementation. To get rid of this baggage,
-// internal implementation (e.g., Write) explicitly use SimpleBuffer:: to
-// qualify the method calls, thus disabling the virtual dispatch and enable
-// inlining.
-
-namespace net {
-
-static const int kInitialSimpleBufferSize = 10;
-
-SimpleBuffer::SimpleBuffer()
-  : storage_(new char[kInitialSimpleBufferSize]),
-    write_idx_(0),
-    read_idx_(0),
-    storage_size_(kInitialSimpleBufferSize) {
-}
-
-SimpleBuffer::SimpleBuffer(int size)
-  : write_idx_(0),
-    read_idx_(0),
-    storage_size_(size) {
-  // Callers may try to allocate overly large blocks, but negative sizes are
-  // obviously wrong.
-  CHECK_GE(size, 0);
-  storage_ = new char[size];
-}
-
-SimpleBuffer::~SimpleBuffer() {
-  delete[] storage_;
-}
-
-
-////////////////////////////////////////////////////////////////////////////////
-
-int SimpleBuffer::ReadableBytes() const {
-  return write_idx_ - read_idx_;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-std::string SimpleBuffer::str() const {
-  std::string s;
-  char * readable_ptr;
-  int readable_size;
-  GetReadablePtr(&readable_ptr, &readable_size);
-  s.append(readable_ptr, readable_ptr + readable_size);
-  return s;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-int SimpleBuffer::BufferSize() const {
-  return storage_size_;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-inline int SimpleBuffer::BytesFree() const {
-  return (storage_size_ - write_idx_);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-bool SimpleBuffer::Empty() const {
-  return (read_idx_ == write_idx_);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-bool SimpleBuffer::Full() const {
-  return ((write_idx_ == storage_size_) && (read_idx_ != write_idx_));
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// returns the number of characters written.
-// appends up-to-'size' bytes to the simplebuffer.
-int SimpleBuffer::Write(const char* bytes, int size) {
-  bool has_room = ((storage_size_ - write_idx_) >= size);
-  if (!has_room) {
-    (void)Reserve(size);
-  }
-  memcpy(storage_ + write_idx_, bytes, size);
-  SimpleBuffer::AdvanceWritablePtr(size);
-  return size;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// stores a pointer into the simple buffer in *ptr,
-// and stores the number of characters which are allowed
-// to be written in *size.
-inline void SimpleBuffer::GetWritablePtr(char **ptr, int* size) const {
-  *ptr = storage_ + write_idx_;
-  *size = SimpleBuffer::BytesFree();
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// stores a pointer into the simple buffer in *ptr,
-// and stores the number of characters which are allowed
-// to be read in *size.
-void SimpleBuffer::GetReadablePtr(char **ptr, int* size) const {
-  *ptr = storage_ + read_idx_;
-  *size = write_idx_ - read_idx_;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// returns the number of bytes read into 'bytes'
-int SimpleBuffer::Read(char* bytes, int size) {
-  char * read_ptr = NULL;
-  int read_size = 0;
-  GetReadablePtr(&read_ptr, &read_size);
-  if (read_size > size) {
-    read_size = size;
-  }
-  memcpy(bytes, read_ptr, read_size);
-  AdvanceReadablePtr(read_size);
-  return read_size;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// removes all data from the simple buffer
-void SimpleBuffer::Clear() {
-  read_idx_ = write_idx_ = 0;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// Attempts to reserve a contiguous block of buffer space by either reclaiming
-// old data that is already read, and reallocate large storage as needed.
-bool SimpleBuffer::Reserve(int size) {
-  if (size > 0 && BytesFree() < size) {
-    char * read_ptr = NULL;
-    int read_size = 0;
-    GetReadablePtr(&read_ptr, &read_size);
-
-    if (read_size + size <= BufferSize()) {
-      // Can reclaim space from already read bytes by shifting
-      memmove(storage_, read_ptr, read_size);
-      read_idx_ = 0;
-      write_idx_ = read_size;
-      CHECK_GE(BytesFree(), size);
-    } else {
-      // what we need is to have at least size bytes available for writing.
-      // This implies that the buffer needs to be at least size bytes +
-      // read_size bytes long. Since we want linear time extensions in the case
-      // that we're extending this thing repeatedly, we should extend to twice
-      // the current size (if that is big enough), or the size + read_size
-      // bytes, whichever is larger.
-      int new_storage_size = 2 * storage_size_;
-      if (new_storage_size < size + read_size) {
-        new_storage_size = size + read_size;
-      }
-
-      // have to extend the thing
-      char* new_storage = new char[new_storage_size];
-
-      // copy still useful info to the new buffer.
-      memcpy(new_storage, read_ptr, read_size);
-      // reset pointers.
-      read_idx_ = 0;
-      write_idx_ = read_size;
-      delete[] storage_;
-      storage_ = new_storage;
-      storage_size_ = new_storage_size;
-    }
-  }
-  return true;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// removes the oldest 'amount_to_consume' characters.
-void SimpleBuffer::AdvanceReadablePtr(int amount_to_advance) {
-  read_idx_ += amount_to_advance;
-  if (read_idx_ > storage_size_) {
-    read_idx_ = storage_size_;
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// Moves the internal pointers around such that the
-// amount of data specified here is expected to
-// already be resident (as if it was Written)
-inline void SimpleBuffer::AdvanceWritablePtr(int amount_to_advance) {
-  write_idx_ += amount_to_advance;
-  if (write_idx_ > storage_size_) {
-    write_idx_ = storage_size_;
-  }
-}
-
-}  // namespace net