am 155fa8c6: am c0c674cd: Make MmappedBuffer use byte array view.
* commit '155fa8c6f7030001906da4b6a97e4d6d26f96c6b':
Make MmappedBuffer use byte array view.
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/content/single_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/content/single_dict_content.h
index 6433650..49f4468 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/content/single_dict_content.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/content/single_dict_content.h
@@ -30,6 +30,7 @@
#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
+#include "utils/byte_array_view.h"
namespace latinime {
namespace backward {
@@ -40,8 +41,9 @@
SingleDictContent(const char *const dictPath, const char *const contentFileName,
const bool isUpdatable)
: mMmappedBuffer(MmappedBuffer::openBuffer(dictPath, contentFileName, isUpdatable)),
- mExpandableContentBuffer(mMmappedBuffer ? mMmappedBuffer->getBuffer() : nullptr,
- mMmappedBuffer ? mMmappedBuffer->getBufferSize() : 0,
+ mExpandableContentBuffer(
+ mMmappedBuffer ? mMmappedBuffer->getReadWriteByteArrayView() :
+ ReadWriteByteArrayView(),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
mIsValid(mMmappedBuffer) {}
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/content/sparse_table_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/content/sparse_table_dict_content.h
index c7233ed..3c626df 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/content/sparse_table_dict_content.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/content/sparse_table_dict_content.h
@@ -31,6 +31,7 @@
#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
#include "suggest/policyimpl/dictionary/utils/sparse_table.h"
+#include "utils/byte_array_view.h"
namespace latinime {
namespace backward {
@@ -50,15 +51,16 @@
mContentBuffer(
MmappedBuffer::openBuffer(dictPath, contentFileName, isUpdatable)),
mExpandableLookupTableBuffer(
- mLookupTableBuffer ? mLookupTableBuffer->getBuffer() : nullptr,
- mLookupTableBuffer ? mLookupTableBuffer->getBufferSize() : 0,
+ mLookupTableBuffer ? mLookupTableBuffer->getReadWriteByteArrayView() :
+ ReadWriteByteArrayView(),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
mExpandableAddressTableBuffer(
- mAddressTableBuffer ? mAddressTableBuffer->getBuffer() : nullptr,
- mAddressTableBuffer ? mAddressTableBuffer->getBufferSize() : 0,
+ mAddressTableBuffer ? mAddressTableBuffer->getReadWriteByteArrayView() :
+ ReadWriteByteArrayView(),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
- mExpandableContentBuffer(mContentBuffer ? mContentBuffer->getBuffer() : nullptr,
- mContentBuffer ? mContentBuffer->getBufferSize() : 0,
+ mExpandableContentBuffer(
+ mContentBuffer ? mContentBuffer->getReadWriteByteArrayView() :
+ ReadWriteByteArrayView(),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
mAddressLookupTable(&mExpandableLookupTableBuffer, &mExpandableAddressTableBuffer,
sparseTableBlockSize, sparseTableDataSize),
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_dict_buffers.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_dict_buffers.cpp
index 93f1929..3dfbd1c 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_dict_buffers.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/backward/v402/ver4_dict_buffers.cpp
@@ -30,6 +30,7 @@
#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
#include "suggest/policyimpl/dictionary/utils/file_utils.h"
+#include "utils/byte_array_view.h"
namespace latinime {
namespace backward {
@@ -130,12 +131,12 @@
: mHeaderBuffer(std::move(headerBuffer)),
mDictBuffer(MmappedBuffer::openBuffer(dictPath,
Ver4DictConstants::TRIE_FILE_EXTENSION, isUpdatable)),
- mHeaderPolicy(mHeaderBuffer->getBuffer(), formatVersion),
- mExpandableHeaderBuffer(mHeaderBuffer ? mHeaderBuffer->getBuffer() : nullptr,
- mHeaderPolicy.getSize(),
+ mHeaderPolicy(mHeaderBuffer->getReadOnlyByteArrayView().data(), formatVersion),
+ mExpandableHeaderBuffer(mHeaderBuffer->getReadWriteByteArrayView(),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
- mExpandableTrieBuffer(mDictBuffer ? mDictBuffer->getBuffer() : nullptr,
- mDictBuffer ? mDictBuffer->getBufferSize() : 0,
+ mExpandableTrieBuffer(
+ mDictBuffer ? mDictBuffer->getReadWriteByteArrayView() :
+ ReadWriteByteArrayView(),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
mTerminalPositionLookupTable(dictPath, isUpdatable),
mProbabilityDictContent(dictPath, mHeaderPolicy.hasHistoricalInfoOfWords(), isUpdatable),
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp
index e4b5fa2..e4ea3da 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp
@@ -31,6 +31,7 @@
#include "suggest/policyimpl/dictionary/utils/file_utils.h"
#include "suggest/policyimpl/dictionary/utils/format_utils.h"
#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
+#include "utils/byte_array_view.h"
namespace latinime {
@@ -110,7 +111,8 @@
return nullptr;
}
const FormatUtils::FORMAT_VERSION formatVersion = FormatUtils::detectFormatVersion(
- mmappedBuffer->getBuffer(), mmappedBuffer->getBufferSize());
+ mmappedBuffer->getReadOnlyByteArrayView().data(),
+ mmappedBuffer->getReadOnlyByteArrayView().size());
switch (formatVersion) {
case FormatUtils::VERSION_2:
AKLOGE("Given path is a directory but the format is version 2. path: %s", path);
@@ -172,8 +174,8 @@
if (!mmappedBuffer) {
return nullptr;
}
- switch (FormatUtils::detectFormatVersion(mmappedBuffer->getBuffer(),
- mmappedBuffer->getBufferSize())) {
+ switch (FormatUtils::detectFormatVersion(mmappedBuffer->getReadOnlyByteArrayView().data(),
+ mmappedBuffer->getReadOnlyByteArrayView().size())) {
case FormatUtils::VERSION_2:
return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(
new PatriciaTriePolicy(std::move(mmappedBuffer)));
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
index 18a62a9..70351d1 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
@@ -29,6 +29,7 @@
#include "suggest/policyimpl/dictionary/structure/v2/ver2_pt_node_array_reader.h"
#include "suggest/policyimpl/dictionary/utils/format_utils.h"
#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
+#include "utils/byte_array_view.h"
namespace latinime {
@@ -39,9 +40,12 @@
public:
PatriciaTriePolicy(MmappedBuffer::MmappedBufferPtr mmappedBuffer)
: mMmappedBuffer(std::move(mmappedBuffer)),
- mHeaderPolicy(mMmappedBuffer->getBuffer(), FormatUtils::VERSION_2),
- mDictRoot(mMmappedBuffer->getBuffer() + mHeaderPolicy.getSize()),
- mDictBufferSize(mMmappedBuffer->getBufferSize() - mHeaderPolicy.getSize()),
+ mHeaderPolicy(mMmappedBuffer->getReadOnlyByteArrayView().data(),
+ FormatUtils::VERSION_2),
+ mDictRoot(mMmappedBuffer->getReadOnlyByteArrayView().data()
+ + mHeaderPolicy.getSize()),
+ mDictBufferSize(mMmappedBuffer->getReadOnlyByteArrayView().size()
+ - mHeaderPolicy.getSize()),
mBigramListPolicy(mDictRoot, mDictBufferSize), mShortcutListPolicy(mDictRoot),
mPtNodeReader(mDictRoot, mDictBufferSize, &mBigramListPolicy, &mShortcutListPolicy),
mPtNodeArrayReader(mDictRoot, mDictBufferSize),
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h
index 203c790..9217741 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h
@@ -24,13 +24,14 @@
#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
+#include "utils/byte_array_view.h"
namespace latinime {
class SingleDictContent {
public:
SingleDictContent(uint8_t *const buffer, const int bufferSize)
- : mExpandableContentBuffer(buffer, bufferSize,
+ : mExpandableContentBuffer(ReadWriteByteArrayView(buffer, bufferSize),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE) {}
SingleDictContent()
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h
index d665961..c98dd11 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h
@@ -24,6 +24,7 @@
#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
#include "suggest/policyimpl/dictionary/utils/sparse_table.h"
+#include "utils/byte_array_view.h"
namespace latinime {
@@ -32,14 +33,17 @@
public:
AK_FORCE_INLINE SparseTableDictContent(uint8_t *const *buffers, const int *bufferSizes,
const int sparseTableBlockSize, const int sparseTableDataSize)
- : mExpandableLookupTableBuffer(buffers[LOOKUP_TABLE_BUFFER_INDEX],
- bufferSizes[LOOKUP_TABLE_BUFFER_INDEX],
+ : mExpandableLookupTableBuffer(
+ ReadWriteByteArrayView(buffers[LOOKUP_TABLE_BUFFER_INDEX],
+ bufferSizes[LOOKUP_TABLE_BUFFER_INDEX]),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
- mExpandableAddressTableBuffer(buffers[ADDRESS_TABLE_BUFFER_INDEX],
- bufferSizes[ADDRESS_TABLE_BUFFER_INDEX],
+ mExpandableAddressTableBuffer(
+ ReadWriteByteArrayView(buffers[ADDRESS_TABLE_BUFFER_INDEX],
+ bufferSizes[ADDRESS_TABLE_BUFFER_INDEX]),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
- mExpandableContentBuffer(buffers[CONTENT_BUFFER_INDEX],
- bufferSizes[CONTENT_BUFFER_INDEX],
+ mExpandableContentBuffer(
+ ReadWriteByteArrayView(buffers[CONTENT_BUFFER_INDEX],
+ bufferSizes[CONTENT_BUFFER_INDEX]),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
mAddressLookupTable(&mExpandableLookupTableBuffer, &mExpandableAddressTableBuffer,
sparseTableBlockSize, sparseTableDataSize) {}
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
index e350108..a2920e4 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
@@ -26,6 +26,7 @@
#include "suggest/policyimpl/dictionary/utils/byte_array_utils.h"
#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
#include "suggest/policyimpl/dictionary/utils/file_utils.h"
+#include "utils/byte_array_view.h"
namespace latinime {
@@ -46,14 +47,16 @@
}
std::vector<uint8_t *> buffers;
std::vector<int> bufferSizes;
- uint8_t *const buffer = bodyBuffer->getBuffer();
+ const ReadWriteByteArrayView buffer = bodyBuffer->getReadWriteByteArrayView();
int position = 0;
- while (position < bodyBuffer->getBufferSize()) {
- const int bufferSize = ByteArrayUtils::readUint32AndAdvancePosition(buffer, &position);
- buffers.push_back(buffer + position);
- bufferSizes.push_back(bufferSize);
+ while (position < static_cast<int>(buffer.size())) {
+ const int bufferSize = ByteArrayUtils::readUint32AndAdvancePosition(
+ buffer.data(), &position);
+ const ReadWriteByteArrayView subBuffer = buffer.subView(position, bufferSize);
+ buffers.push_back(subBuffer.data());
+ bufferSizes.push_back(subBuffer.size());
position += bufferSize;
- if (bufferSize < 0 || position < 0 || position > bodyBuffer->getBufferSize()) {
+ if (bufferSize < 0 || position < 0 || position > static_cast<int>(buffer.size())) {
AKLOGE("The dict body file is corrupted.");
return Ver4DictBuffersPtr(nullptr);
}
@@ -177,12 +180,12 @@
const FormatUtils::FORMAT_VERSION formatVersion,
const std::vector<uint8_t *> &contentBuffers, const std::vector<int> &contentBufferSizes)
: mHeaderBuffer(std::move(headerBuffer)), mDictBuffer(std::move(bodyBuffer)),
- mHeaderPolicy(mHeaderBuffer->getBuffer(), formatVersion),
- mExpandableHeaderBuffer(mHeaderBuffer ? mHeaderBuffer->getBuffer() : nullptr,
- mHeaderPolicy.getSize(),
+ mHeaderPolicy(mHeaderBuffer->getReadOnlyByteArrayView().data(), formatVersion),
+ mExpandableHeaderBuffer(mHeaderBuffer->getReadWriteByteArrayView(),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
- mExpandableTrieBuffer(contentBuffers[Ver4DictConstants::TRIE_BUFFER_INDEX],
- contentBufferSizes[Ver4DictConstants::TRIE_BUFFER_INDEX],
+ mExpandableTrieBuffer(
+ ReadWriteByteArrayView(contentBuffers[Ver4DictConstants::TRIE_BUFFER_INDEX],
+ contentBufferSizes[Ver4DictConstants::TRIE_BUFFER_INDEX]),
BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
mTerminalPositionLookupTable(
contentBuffers[Ver4DictConstants::TERMINAL_ADDRESS_LOOKUP_TABLE_BUFFER_INDEX],
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h b/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h
index 24e2dd4..fad83aa 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h
@@ -35,15 +35,14 @@
public:
static const size_t DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE;
- BufferWithExtendableBuffer(uint8_t *const originalBuffer, const int originalBufferSize,
+ BufferWithExtendableBuffer(const ReadWriteByteArrayView originalBuffer,
const int maxAdditionalBufferSize)
- : mOriginalBuffer(originalBuffer, originalBufferSize),
- mAdditionalBuffer(0), mUsedAdditionalBufferSize(0),
+ : mOriginalBuffer(originalBuffer), mAdditionalBuffer(), mUsedAdditionalBufferSize(0),
mMaxAdditionalBufferSize(maxAdditionalBufferSize) {}
// Without original buffer.
BufferWithExtendableBuffer(const int maxAdditionalBufferSize)
- : mOriginalBuffer(), mAdditionalBuffer(0), mUsedAdditionalBufferSize(0),
+ : mOriginalBuffer(), mAdditionalBuffer(), mUsedAdditionalBufferSize(0),
mMaxAdditionalBufferSize(maxAdditionalBufferSize) {}
AK_FORCE_INLINE int getTailPosition() const {
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h b/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h
index 8460087..e253103 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h
@@ -21,6 +21,7 @@
#include <memory>
#include "defines.h"
+#include "utils/byte_array_view.h"
namespace latinime {
@@ -39,12 +40,12 @@
~MmappedBuffer();
- AK_FORCE_INLINE uint8_t *getBuffer() const {
- return mBuffer;
+ ReadWriteByteArrayView getReadWriteByteArrayView() const {
+ return mByteArrayView;
}
- AK_FORCE_INLINE int getBufferSize() const {
- return mBufferSize;
+ ReadOnlyByteArrayView getReadOnlyByteArrayView() const {
+ return mByteArrayView.getReadOnlyView();
}
AK_FORCE_INLINE bool isUpdatable() const {
@@ -55,18 +56,17 @@
AK_FORCE_INLINE MmappedBuffer(uint8_t *const buffer, const int bufferSize,
void *const mmappedBuffer, const int alignedSize, const int mmapFd,
const bool isUpdatable)
- : mBuffer(buffer), mBufferSize(bufferSize), mMmappedBuffer(mmappedBuffer),
+ : mByteArrayView(buffer, bufferSize), mMmappedBuffer(mmappedBuffer),
mAlignedSize(alignedSize), mMmapFd(mmapFd), mIsUpdatable(isUpdatable) {}
// Empty file. We have to handle an empty file as a valid part of a dictionary.
AK_FORCE_INLINE MmappedBuffer(const bool isUpdatable)
- : mBuffer(nullptr), mBufferSize(0), mMmappedBuffer(nullptr), mAlignedSize(0),
+ : mByteArrayView(), mMmappedBuffer(nullptr), mAlignedSize(0),
mMmapFd(0), mIsUpdatable(isUpdatable) {}
DISALLOW_IMPLICIT_CONSTRUCTORS(MmappedBuffer);
- uint8_t *const mBuffer;
- const int mBufferSize;
+ const ReadWriteByteArrayView mByteArrayView;
void *const mMmappedBuffer;
const int mAlignedSize;
const int mMmapFd;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.cpp
index 2904b1e..407b8ef 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.cpp
@@ -43,9 +43,8 @@
writeEntry(EMPTY_BITMAP_ENTRY, ROOT_BITMAP_ENTRY_INDEX);
}
-TrieMap::TrieMap(uint8_t *const buffer, const int bufferSize)
- : mBuffer(buffer, bufferSize,
- BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE) {}
+TrieMap::TrieMap(const ReadWriteByteArrayView buffer)
+ : mBuffer(buffer, BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE) {}
void TrieMap::dump(const int from, const int to) const {
AKLOGI("BufSize: %d", mBuffer.getTailPosition());
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.h b/native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.h
index 8b33346..a294ab8 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/trie_map.h
@@ -24,6 +24,7 @@
#include "defines.h"
#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "utils/byte_array_view.h"
namespace latinime {
@@ -161,7 +162,7 @@
TrieMap();
// Construct TrieMap using existing data in the memory region written by save().
- TrieMap(uint8_t *const buffer, const int bufferSize);
+ TrieMap(const ReadWriteByteArrayView buffer);
void dump(const int from = 0, const int to = 0) const;
bool isNearSizeLimit() const {
diff --git a/native/jni/src/utils/byte_array_view.h b/native/jni/src/utils/byte_array_view.h
index d13999c..2c97c6d 100644
--- a/native/jni/src/utils/byte_array_view.h
+++ b/native/jni/src/utils/byte_array_view.h
@@ -71,6 +71,11 @@
return ReadOnlyByteArrayView(mPtr, mSize);
}
+ ReadWriteByteArrayView subView(const size_t start, const size_t n) const {
+ ASSERT(start + n <= mSize);
+ return ReadWriteByteArrayView(mPtr + start, n);
+ }
+
private:
DISALLOW_ASSIGNMENT_OPERATOR(ReadWriteByteArrayView);