Remove //net (except for Android test stuff) and sdch

net/disk_cache/memory/mem_entry_impl.cc

Index: net/disk_cache/memory/mem_entry_impl.cc
diff --git a/net/disk_cache/memory/mem_entry_impl.cc b/net/disk_cache/memory/mem_entry_impl.cc
deleted file mode 100644
index 7c6199b951b28febf2c2d2cb3b1c595a67ab0324..0000000000000000000000000000000000000000
--- a/net/disk_cache/memory/mem_entry_impl.cc
+++ /dev/null
@@ -1,631 +0,0 @@
-// Copyright (c) 2012 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/disk_cache/memory/mem_entry_impl.h"
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "base/strings/stringprintf.h"
-#include "base/values.h"
-#include "net/base/io_buffer.h"
-#include "net/base/net_errors.h"
-#include "net/disk_cache/memory/mem_backend_impl.h"
-#include "net/disk_cache/net_log_parameters.h"
-
-using base::Time;
-
-namespace {
-
-const int kSparseData = 1;
-
-// Maximum size of a sparse entry is 2 to the power of this number.
-const int kMaxSparseEntryBits = 12;
-
-// Sparse entry has maximum size of 4KB.
-const int kMaxSparseEntrySize = 1 << kMaxSparseEntryBits;
-
-// Convert global offset to child index.
-inline int ToChildIndex(int64 offset) {
-  return static_cast<int>(offset >> kMaxSparseEntryBits);
-}
-
-// Convert global offset to offset in child entry.
-inline int ToChildOffset(int64 offset) {
-  return static_cast<int>(offset & (kMaxSparseEntrySize - 1));
-}
-
-// Returns a name for a child entry given the base_name of the parent and the
-// child_id.  This name is only used for logging purposes.
-// If the entry is called entry_name, child entries will be named something
-// like Range_entry_name:YYY where YYY is the number of the particular child.
-std::string GenerateChildName(const std::string& base_name, int child_id) {
-  return base::StringPrintf("Range_%s:%i", base_name.c_str(), child_id);
-}
-
-// Returns NetLog parameters for the creation of a child MemEntryImpl.  Separate
-// function needed because child entries don't suppport GetKey().
-base::Value* NetLogChildEntryCreationCallback(
-    const disk_cache::MemEntryImpl* parent,
-    int child_id,
-    net::NetLog::LogLevel /* log_level */) {
-  base::DictionaryValue* dict = new base::DictionaryValue();
-  dict->SetString("key", GenerateChildName(parent->GetKey(), child_id));
-  dict->SetBoolean("created", true);
-  return dict;
-}
-
-}  // namespace
-
-namespace disk_cache {
-
-MemEntryImpl::MemEntryImpl(MemBackendImpl* backend) {
-  doomed_ = false;
-  backend_ = backend;
-  ref_count_ = 0;
-  parent_ = NULL;
-  child_id_ = 0;
-  child_first_pos_ = 0;
-  next_ = NULL;
-  prev_ = NULL;
-  for (int i = 0; i < NUM_STREAMS; i++)
-    data_size_[i] = 0;
-}
-
-// ------------------------------------------------------------------------
-
-bool MemEntryImpl::CreateEntry(const std::string& key, net::NetLog* net_log) {
-  key_ = key;
-  Time current = Time::Now();
-  last_modified_ = current;
-  last_used_ = current;
-
-  net_log_ = net::BoundNetLog::Make(net_log,
-                                    net::NetLog::SOURCE_MEMORY_CACHE_ENTRY);
-  // Must be called after |key_| is set, so GetKey() works.
-  net_log_.BeginEvent(
-      net::NetLog::TYPE_DISK_CACHE_MEM_ENTRY_IMPL,
-      CreateNetLogEntryCreationCallback(this, true));
-
-  Open();
-  backend_->ModifyStorageSize(0, static_cast<int32>(key.size()));
-  return true;
-}
-
-void MemEntryImpl::InternalDoom() {
-  net_log_.AddEvent(net::NetLog::TYPE_ENTRY_DOOM);
-  doomed_ = true;
-  if (!ref_count_) {
-    if (type() == kParentEntry) {
-      // If this is a parent entry, we need to doom all the child entries.
-      if (children_.get()) {
-        EntryMap children;
-        children.swap(*children_);
-        for (EntryMap::iterator i = children.begin();
-             i != children.end(); ++i) {
-          // Since a pointer to this object is also saved in the map, avoid
-          // dooming it.
-          if (i->second != this)
-            i->second->Doom();
-        }
-        DCHECK(children_->empty());
-      }
-    } else {
-      // If this is a child entry, detach it from the parent.
-      parent_->DetachChild(child_id_);
-    }
-    delete this;
-  }
-}
-
-void MemEntryImpl::Open() {
-  // Only a parent entry can be opened.
-  // TODO(hclam): make sure it's correct to not apply the concept of ref
-  // counting to child entry.
-  DCHECK(type() == kParentEntry);
-  ref_count_++;
-  DCHECK_GE(ref_count_, 0);
-  DCHECK(!doomed_);
-}
-
-bool MemEntryImpl::InUse() {
-  if (type() == kParentEntry) {
-    return ref_count_ > 0;
-  } else {
-    // A child entry is always not in use. The consequence is that a child entry
-    // can always be evicted while the associated parent entry is currently in
-    // used (i.e. opened).
-    return false;
-  }
-}
-
-// ------------------------------------------------------------------------
-
-void MemEntryImpl::Doom() {
-  if (doomed_)
-    return;
-  if (type() == kParentEntry) {
-    // Perform internal doom from the backend if this is a parent entry.
-    backend_->InternalDoomEntry(this);
-  } else {
-    // Manually detach from the backend and perform internal doom.
-    backend_->RemoveFromRankingList(this);
-    InternalDoom();
-  }
-}
-
-void MemEntryImpl::Close() {
-  // Only a parent entry can be closed.
-  DCHECK(type() == kParentEntry);
-  ref_count_--;
-  DCHECK_GE(ref_count_, 0);
-  if (!ref_count_ && doomed_)
-    InternalDoom();
-}
-
-std::string MemEntryImpl::GetKey() const {
-  // A child entry doesn't have key so this method should not be called.
-  DCHECK(type() == kParentEntry);
-  return key_;
-}
-
-Time MemEntryImpl::GetLastUsed() const {
-  return last_used_;
-}
-
-Time MemEntryImpl::GetLastModified() const {
-  return last_modified_;
-}
-
-int32 MemEntryImpl::GetDataSize(int index) const {
-  if (index < 0 || index >= NUM_STREAMS)
-    return 0;
-  return data_size_[index];
-}
-
-int MemEntryImpl::ReadData(int index, int offset, IOBuffer* buf, int buf_len,
-                           const CompletionCallback& callback) {
-  if (net_log_.IsLogging()) {
-    net_log_.BeginEvent(
-        net::NetLog::TYPE_ENTRY_READ_DATA,
-        CreateNetLogReadWriteDataCallback(index, offset, buf_len, false));
-  }
-
-  int result = InternalReadData(index, offset, buf, buf_len);
-
-  if (net_log_.IsLogging()) {
-    net_log_.EndEvent(
-        net::NetLog::TYPE_ENTRY_READ_DATA,
-        CreateNetLogReadWriteCompleteCallback(result));
-  }
-  return result;
-}
-
-int MemEntryImpl::WriteData(int index, int offset, IOBuffer* buf, int buf_len,
-                            const CompletionCallback& callback, bool truncate) {
-  if (net_log_.IsLogging()) {
-    net_log_.BeginEvent(
-        net::NetLog::TYPE_ENTRY_WRITE_DATA,
-        CreateNetLogReadWriteDataCallback(index, offset, buf_len, truncate));
-  }
-
-  int result = InternalWriteData(index, offset, buf, buf_len, truncate);
-
-  if (net_log_.IsLogging()) {
-    net_log_.EndEvent(
-        net::NetLog::TYPE_ENTRY_WRITE_DATA,
-        CreateNetLogReadWriteCompleteCallback(result));
-  }
-  return result;
-}
-
-int MemEntryImpl::ReadSparseData(int64 offset, IOBuffer* buf, int buf_len,
-                                 const CompletionCallback& callback) {
-  if (net_log_.IsLogging()) {
-    net_log_.BeginEvent(
-        net::NetLog::TYPE_SPARSE_READ,
-        CreateNetLogSparseOperationCallback(offset, buf_len));
-  }
-  int result = InternalReadSparseData(offset, buf, buf_len);
-  if (net_log_.IsLogging())
-    net_log_.EndEvent(net::NetLog::TYPE_SPARSE_READ);
-  return result;
-}
-
-int MemEntryImpl::WriteSparseData(int64 offset, IOBuffer* buf, int buf_len,
-                                  const CompletionCallback& callback) {
-  if (net_log_.IsLogging()) {
-    net_log_.BeginEvent(
-        net::NetLog::TYPE_SPARSE_WRITE,
-        CreateNetLogSparseOperationCallback(offset, buf_len));
-  }
-  int result = InternalWriteSparseData(offset, buf, buf_len);
-  if (net_log_.IsLogging())
-    net_log_.EndEvent(net::NetLog::TYPE_SPARSE_WRITE);
-  return result;
-}
-
-int MemEntryImpl::GetAvailableRange(int64 offset, int len, int64* start,
-                                    const CompletionCallback& callback) {
-  if (net_log_.IsLogging()) {
-    net_log_.BeginEvent(
-        net::NetLog::TYPE_SPARSE_GET_RANGE,
-        CreateNetLogSparseOperationCallback(offset, len));
-  }
-  int result = GetAvailableRange(offset, len, start);
-  if (net_log_.IsLogging()) {
-    net_log_.EndEvent(
-        net::NetLog::TYPE_SPARSE_GET_RANGE,
-        CreateNetLogGetAvailableRangeResultCallback(*start, result));
-  }
-  return result;
-}
-
-bool MemEntryImpl::CouldBeSparse() const {
-  DCHECK_EQ(kParentEntry, type());
-  return (children_.get() != NULL);
-}
-
-int MemEntryImpl::ReadyForSparseIO(const CompletionCallback& callback) {
-  return net::OK;
-}
-
-// ------------------------------------------------------------------------
-
-MemEntryImpl::~MemEntryImpl() {
-  for (int i = 0; i < NUM_STREAMS; i++)
-    backend_->ModifyStorageSize(data_size_[i], 0);
-  backend_->ModifyStorageSize(static_cast<int32>(key_.size()), 0);
-  net_log_.EndEvent(net::NetLog::TYPE_DISK_CACHE_MEM_ENTRY_IMPL);
-}
-
-int MemEntryImpl::InternalReadData(int index, int offset, IOBuffer* buf,
-                                   int buf_len) {
-  DCHECK(type() == kParentEntry || index == kSparseData);
-
-  if (index < 0 || index >= NUM_STREAMS)
-    return net::ERR_INVALID_ARGUMENT;
-
-  int entry_size = GetDataSize(index);
-  if (offset >= entry_size || offset < 0 || !buf_len)
-    return 0;
-
-  if (buf_len < 0)
-    return net::ERR_INVALID_ARGUMENT;
-
-  if (offset + buf_len > entry_size)
-    buf_len = entry_size - offset;
-
-  UpdateRank(false);
-
-  memcpy(buf->data(), &(data_[index])[offset], buf_len);
-  return buf_len;
-}
-
-int MemEntryImpl::InternalWriteData(int index, int offset, IOBuffer* buf,
-                                    int buf_len, bool truncate) {
-  DCHECK(type() == kParentEntry || index == kSparseData);
-
-  if (index < 0 || index >= NUM_STREAMS)
-    return net::ERR_INVALID_ARGUMENT;
-
-  if (offset < 0 || buf_len < 0)
-    return net::ERR_INVALID_ARGUMENT;
-
-  int max_file_size = backend_->MaxFileSize();
-
-  // offset of buf_len could be negative numbers.
-  if (offset > max_file_size || buf_len > max_file_size ||
-      offset + buf_len > max_file_size) {
-    return net::ERR_FAILED;
-  }
-
-  // Read the size at this point.
-  int entry_size = GetDataSize(index);
-
-  PrepareTarget(index, offset, buf_len);
-
-  if (entry_size < offset + buf_len) {
-    backend_->ModifyStorageSize(entry_size, offset + buf_len);
-    data_size_[index] = offset + buf_len;
-  } else if (truncate) {
-    if (entry_size > offset + buf_len) {
-      backend_->ModifyStorageSize(entry_size, offset + buf_len);
-      data_size_[index] = offset + buf_len;
-    }
-  }
-
-  UpdateRank(true);
-
-  if (!buf_len)
-    return 0;
-
-  memcpy(&(data_[index])[offset], buf->data(), buf_len);
-  return buf_len;
-}
-
-int MemEntryImpl::InternalReadSparseData(int64 offset, IOBuffer* buf,
-                                         int buf_len) {
-  DCHECK(type() == kParentEntry);
-
-  if (!InitSparseInfo())
-    return net::ERR_CACHE_OPERATION_NOT_SUPPORTED;
-
-  if (offset < 0 || buf_len < 0)
-    return net::ERR_INVALID_ARGUMENT;
-
-  // We will keep using this buffer and adjust the offset in this buffer.
-  scoped_refptr<net::DrainableIOBuffer> io_buf(
-      new net::DrainableIOBuffer(buf, buf_len));
-
-  // Iterate until we have read enough.
-  while (io_buf->BytesRemaining()) {
-    MemEntryImpl* child = OpenChild(offset + io_buf->BytesConsumed(), false);
-
-    // No child present for that offset.
-    if (!child)
-      break;
-
-    // We then need to prepare the child offset and len.
-    int child_offset = ToChildOffset(offset + io_buf->BytesConsumed());
-
-    // If we are trying to read from a position that the child entry has no data
-    // we should stop.
-    if (child_offset < child->child_first_pos_)
-      break;
-    if (net_log_.IsLogging()) {
-      net_log_.BeginEvent(
-          net::NetLog::TYPE_SPARSE_READ_CHILD_DATA,
-          CreateNetLogSparseReadWriteCallback(child->net_log().source(),
-                                              io_buf->BytesRemaining()));
-    }
-    int ret = child->ReadData(kSparseData, child_offset, io_buf.get(),
-                              io_buf->BytesRemaining(), CompletionCallback());
-    if (net_log_.IsLogging()) {
-      net_log_.EndEventWithNetErrorCode(
-          net::NetLog::TYPE_SPARSE_READ_CHILD_DATA, ret);
-    }
-
-    // If we encounter an error in one entry, return immediately.
-    if (ret < 0)
-      return ret;
-    else if (ret == 0)
-      break;
-
-    // Increment the counter by number of bytes read in the child entry.
-    io_buf->DidConsume(ret);
-  }
-
-  UpdateRank(false);
-
-  return io_buf->BytesConsumed();
-}
-
-int MemEntryImpl::InternalWriteSparseData(int64 offset, IOBuffer* buf,
-                                          int buf_len) {
-  DCHECK(type() == kParentEntry);
-
-  if (!InitSparseInfo())
-    return net::ERR_CACHE_OPERATION_NOT_SUPPORTED;
-
-  if (offset < 0 || buf_len < 0)
-    return net::ERR_INVALID_ARGUMENT;
-
-  scoped_refptr<net::DrainableIOBuffer> io_buf(
-      new net::DrainableIOBuffer(buf, buf_len));
-
-  // This loop walks through child entries continuously starting from |offset|
-  // and writes blocks of data (of maximum size kMaxSparseEntrySize) into each
-  // child entry until all |buf_len| bytes are written. The write operation can
-  // start in the middle of an entry.
-  while (io_buf->BytesRemaining()) {
-    MemEntryImpl* child = OpenChild(offset + io_buf->BytesConsumed(), true);
-    int child_offset = ToChildOffset(offset + io_buf->BytesConsumed());
-
-    // Find the right amount to write, this evaluates the remaining bytes to
-    // write and remaining capacity of this child entry.
-    int write_len = std::min(static_cast<int>(io_buf->BytesRemaining()),
-                             kMaxSparseEntrySize - child_offset);
-
-    // Keep a record of the last byte position (exclusive) in the child.
-    int data_size = child->GetDataSize(kSparseData);
-
-    if (net_log_.IsLogging()) {
-      net_log_.BeginEvent(
-          net::NetLog::TYPE_SPARSE_WRITE_CHILD_DATA,
-          CreateNetLogSparseReadWriteCallback(child->net_log().source(),
-                                              write_len));
-    }
-
-    // Always writes to the child entry. This operation may overwrite data
-    // previously written.
-    // TODO(hclam): if there is data in the entry and this write is not
-    // continuous we may want to discard this write.
-    int ret = child->WriteData(kSparseData, child_offset, io_buf.get(),
-                               write_len, CompletionCallback(), true);
-    if (net_log_.IsLogging()) {
-      net_log_.EndEventWithNetErrorCode(
-          net::NetLog::TYPE_SPARSE_WRITE_CHILD_DATA, ret);
-    }
-    if (ret < 0)
-      return ret;
-    else if (ret == 0)
-      break;
-
-    // Keep a record of the first byte position in the child if the write was
-    // not aligned nor continuous. This is to enable witting to the middle
-    // of an entry and still keep track of data off the aligned edge.
-    if (data_size != child_offset)
-      child->child_first_pos_ = child_offset;
-
-    // Adjust the offset in the IO buffer.
-    io_buf->DidConsume(ret);
-  }
-
-  UpdateRank(true);
-
-  return io_buf->BytesConsumed();
-}
-
-int MemEntryImpl::GetAvailableRange(int64 offset, int len, int64* start) {
-  DCHECK(type() == kParentEntry);
-  DCHECK(start);
-
-  if (!InitSparseInfo())
-    return net::ERR_CACHE_OPERATION_NOT_SUPPORTED;
-
-  if (offset < 0 || len < 0 || !start)
-    return net::ERR_INVALID_ARGUMENT;
-
-  MemEntryImpl* current_child = NULL;
-
-  // Find the first child and record the number of empty bytes.
-  int empty = FindNextChild(offset, len, &current_child);
-  if (current_child) {
-    *start = offset + empty;
-    len -= empty;
-
-    // Counts the number of continuous bytes.
-    int continuous = 0;
-
-    // This loop scan for continuous bytes.
-    while (len && current_child) {
-      // Number of bytes available in this child.
-      int data_size = current_child->GetDataSize(kSparseData) -
-                      ToChildOffset(*start + continuous);
-      if (data_size > len)
-        data_size = len;
-
-      // We have found more continuous bytes so increment the count. Also
-      // decrement the length we should scan.
-      continuous += data_size;
-      len -= data_size;
-
-      // If the next child is discontinuous, break the loop.
-      if (FindNextChild(*start + continuous, len, &current_child))
-        break;
-    }
-    return continuous;
-  }
-  *start = offset;
-  return 0;
-}
-
-void MemEntryImpl::PrepareTarget(int index, int offset, int buf_len) {
-  int entry_size = GetDataSize(index);
-
-  if (entry_size >= offset + buf_len)
-    return;  // Not growing the stored data.
-
-  if (static_cast<int>(data_[index].size()) < offset + buf_len)
-    data_[index].resize(offset + buf_len);
-
-  if (offset <= entry_size)
-    return;  // There is no "hole" on the stored data.
-
-  // Cleanup the hole not written by the user. The point is to avoid returning
-  // random stuff later on.
-  memset(&(data_[index])[entry_size], 0, offset - entry_size);
-}
-
-void MemEntryImpl::UpdateRank(bool modified) {
-  Time current = Time::Now();
-  last_used_ = current;
-
-  if (modified)
-    last_modified_ = current;
-
-  if (!doomed_)
-    backend_->UpdateRank(this);
-}
-
-bool MemEntryImpl::InitSparseInfo() {
-  DCHECK(type() == kParentEntry);
-
-  if (!children_.get()) {
-    // If we already have some data in sparse stream but we are being
-    // initialized as a sparse entry, we should fail.
-    if (GetDataSize(kSparseData))
-      return false;
-    children_.reset(new EntryMap());
-
-    // The parent entry stores data for the first block, so save this object to
-    // index 0.
-    (*children_)[0] = this;
-  }
-  return true;
-}
-
-bool MemEntryImpl::InitChildEntry(MemEntryImpl* parent, int child_id,
-                                  net::NetLog* net_log) {
-  DCHECK(!parent_);
-  DCHECK(!child_id_);
-
-  net_log_ = net::BoundNetLog::Make(net_log,
-                                    net::NetLog::SOURCE_MEMORY_CACHE_ENTRY);
-  net_log_.BeginEvent(
-      net::NetLog::TYPE_DISK_CACHE_MEM_ENTRY_IMPL,
-      base::Bind(&NetLogChildEntryCreationCallback, parent, child_id_));
-
-  parent_ = parent;
-  child_id_ = child_id;
-  Time current = Time::Now();
-  last_modified_ = current;
-  last_used_ = current;
-  // Insert this to the backend's ranking list.
-  backend_->InsertIntoRankingList(this);
-  return true;
-}
-
-MemEntryImpl* MemEntryImpl::OpenChild(int64 offset, bool create) {
-  DCHECK(type() == kParentEntry);
-  int index = ToChildIndex(offset);
-  EntryMap::iterator i = children_->find(index);
-  if (i != children_->end()) {
-    return i->second;
-  } else if (create) {
-    MemEntryImpl* child = new MemEntryImpl(backend_);
-    child->InitChildEntry(this, index, net_log_.net_log());
-    (*children_)[index] = child;
-    return child;
-  }
-  return NULL;
-}
-
-int MemEntryImpl::FindNextChild(int64 offset, int len, MemEntryImpl** child) {
-  DCHECK(child);
-  *child = NULL;
-  int scanned_len = 0;
-
-  // This loop tries to find the first existing child.
-  while (scanned_len < len) {
-    // This points to the current offset in the child.
-    int current_child_offset = ToChildOffset(offset + scanned_len);
-    MemEntryImpl* current_child = OpenChild(offset + scanned_len, false);
-    if (current_child) {
-      int child_first_pos = current_child->child_first_pos_;
-
-      // This points to the first byte that we should be reading from, we need
-      // to take care of the filled region and the current offset in the child.
-      int first_pos =  std::max(current_child_offset, child_first_pos);
-
-      // If the first byte position we should read from doesn't exceed the
-      // filled region, we have found the first child.
-      if (first_pos < current_child->GetDataSize(kSparseData)) {
-         *child = current_child;
-
-         // We need to advance the scanned length.
-         scanned_len += first_pos - current_child_offset;
-         break;
-      }
-    }
-    scanned_len += kMaxSparseEntrySize - current_child_offset;
-  }
-  return scanned_len;
-}
-
-void MemEntryImpl::DetachChild(int child_id) {
-  children_->erase(child_id);
-}
-
-}  // namespace disk_cache