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Copy pathbuffer.cc
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251 lines (210 loc) · 8.56 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#include "arrow/buffer.h"
#include <algorithm>
#include <cstdint>
#include <utility>
#include "arrow/memory_pool.h"
#include "arrow/status.h"
#include "arrow/util/bit_util.h"
#include "arrow/util/logging.h"
#include "arrow/util/string.h"
namespace arrow {
Status Buffer::Copy(const int64_t start, const int64_t nbytes, MemoryPool* pool,
std::shared_ptr<Buffer>* out) const {
// Sanity checks
ARROW_CHECK_LT(start, size_);
ARROW_CHECK_LE(nbytes, size_ - start);
std::shared_ptr<ResizableBuffer> new_buffer;
RETURN_NOT_OK(AllocateResizableBuffer(pool, nbytes, &new_buffer));
std::memcpy(new_buffer->mutable_data(), data() + start, static_cast<size_t>(nbytes));
*out = new_buffer;
return Status::OK();
}
Status Buffer::Copy(const int64_t start, const int64_t nbytes,
std::shared_ptr<Buffer>* out) const {
return Copy(start, nbytes, default_memory_pool(), out);
}
std::string Buffer::ToHexString() {
return HexEncode(data(), static_cast<size_t>(size()));
}
bool Buffer::Equals(const Buffer& other, const int64_t nbytes) const {
return this == &other || (size_ >= nbytes && other.size_ >= nbytes &&
(data_ == other.data_ ||
!memcmp(data_, other.data_, static_cast<size_t>(nbytes))));
}
bool Buffer::Equals(const Buffer& other) const {
return this == &other || (size_ == other.size_ &&
(data_ == other.data_ ||
!memcmp(data_, other.data_, static_cast<size_t>(size_))));
}
Status Buffer::FromString(const std::string& data, MemoryPool* pool,
std::shared_ptr<Buffer>* out) {
auto size = static_cast<int64_t>(data.size());
RETURN_NOT_OK(AllocateBuffer(pool, size, out));
std::copy(data.c_str(), data.c_str() + size, (*out)->mutable_data());
return Status::OK();
}
Status Buffer::FromString(const std::string& data, std::shared_ptr<Buffer>* out) {
return FromString(data, default_memory_pool(), out);
}
class StlStringBuffer : public Buffer {
public:
explicit StlStringBuffer(std::string&& data) : Buffer(nullptr, 0), input_(data) {
data_ = reinterpret_cast<const uint8_t*>(input_.c_str());
size_ = static_cast<int64_t>(input_.size());
capacity_ = size_;
}
private:
std::string input_;
};
std::shared_ptr<Buffer> Buffer::FromString(std::string&& data) {
return std::make_shared<StlStringBuffer>(std::move(data));
}
std::string Buffer::ToString() const {
return std::string(reinterpret_cast<const char*>(data_), static_cast<size_t>(size_));
}
void Buffer::CheckMutable() const { DCHECK(is_mutable()) << "buffer not mutable"; }
/// A Buffer whose lifetime is tied to a particular MemoryPool
class PoolBuffer : public ResizableBuffer {
public:
explicit PoolBuffer(MemoryPool* pool) : ResizableBuffer(nullptr, 0) {
if (pool == nullptr) {
pool = default_memory_pool();
}
pool_ = pool;
}
~PoolBuffer() override {
if (mutable_data_ != nullptr) {
pool_->Free(mutable_data_, capacity_);
}
}
Status Reserve(const int64_t capacity) override {
if (!mutable_data_ || capacity > capacity_) {
uint8_t* new_data;
int64_t new_capacity = BitUtil::RoundUpToMultipleOf64(capacity);
if (mutable_data_) {
RETURN_NOT_OK(pool_->Reallocate(capacity_, new_capacity, &mutable_data_));
} else {
RETURN_NOT_OK(pool_->Allocate(new_capacity, &new_data));
mutable_data_ = new_data;
}
data_ = mutable_data_;
capacity_ = new_capacity;
}
return Status::OK();
}
Status Resize(const int64_t new_size, bool shrink_to_fit = true) override {
if (mutable_data_ && shrink_to_fit && new_size <= size_) {
// Buffer is non-null and is not growing, so shrink to the requested size without
// excess space.
int64_t new_capacity = BitUtil::RoundUpToMultipleOf64(new_size);
if (capacity_ != new_capacity) {
// Buffer hasn't got yet the requested size.
RETURN_NOT_OK(pool_->Reallocate(capacity_, new_capacity, &mutable_data_));
data_ = mutable_data_;
capacity_ = new_capacity;
}
} else {
RETURN_NOT_OK(Reserve(new_size));
}
size_ = new_size;
return Status::OK();
}
private:
MemoryPool* pool_;
};
std::shared_ptr<Buffer> SliceMutableBuffer(const std::shared_ptr<Buffer>& buffer,
const int64_t offset, const int64_t length) {
return std::make_shared<MutableBuffer>(buffer, offset, length);
}
MutableBuffer::MutableBuffer(const std::shared_ptr<Buffer>& parent, const int64_t offset,
const int64_t size)
: MutableBuffer(parent->mutable_data() + offset, size) {
DCHECK(parent->is_mutable()) << "Must pass mutable buffer";
parent_ = parent;
}
namespace {
// A utility that does most of the work of the `AllocateBuffer` and
// `AllocateResizableBuffer` methods. The argument `buffer` should be a smart pointer to a
// PoolBuffer.
template <typename PoolBufferPtr, typename BufferPtr>
inline Status ResizePoolBuffer(PoolBufferPtr&& buffer, const int64_t size,
BufferPtr* out) {
RETURN_NOT_OK(buffer->Resize(size));
buffer->ZeroPadding();
*out = std::move(buffer);
return Status::OK();
}
} // namespace
Status AllocateBuffer(MemoryPool* pool, const int64_t size,
std::shared_ptr<Buffer>* out) {
return ResizePoolBuffer(std::make_shared<PoolBuffer>(pool), size, out);
}
Status AllocateBuffer(MemoryPool* pool, const int64_t size,
std::unique_ptr<Buffer>* out) {
return ResizePoolBuffer(std::unique_ptr<PoolBuffer>(new PoolBuffer(pool)), size, out);
}
Status AllocateBuffer(const int64_t size, std::shared_ptr<Buffer>* out) {
return AllocateBuffer(default_memory_pool(), size, out);
}
Status AllocateBuffer(const int64_t size, std::unique_ptr<Buffer>* out) {
return AllocateBuffer(default_memory_pool(), size, out);
}
Status AllocateResizableBuffer(MemoryPool* pool, const int64_t size,
std::shared_ptr<ResizableBuffer>* out) {
return ResizePoolBuffer(std::make_shared<PoolBuffer>(pool), size, out);
}
Status AllocateResizableBuffer(MemoryPool* pool, const int64_t size,
std::unique_ptr<ResizableBuffer>* out) {
return ResizePoolBuffer(std::unique_ptr<PoolBuffer>(new PoolBuffer(pool)), size, out);
}
Status AllocateResizableBuffer(const int64_t size,
std::shared_ptr<ResizableBuffer>* out) {
return AllocateResizableBuffer(default_memory_pool(), size, out);
}
Status AllocateResizableBuffer(const int64_t size,
std::unique_ptr<ResizableBuffer>* out) {
return AllocateResizableBuffer(default_memory_pool(), size, out);
}
Status AllocateBitmap(MemoryPool* pool, int64_t length, std::shared_ptr<Buffer>* out) {
return AllocateBuffer(pool, BitUtil::BytesForBits(length), out);
}
Status AllocateEmptyBitmap(MemoryPool* pool, int64_t length,
std::shared_ptr<Buffer>* out) {
RETURN_NOT_OK(AllocateBitmap(pool, length, out));
memset((*out)->mutable_data(), 0, static_cast<size_t>((*out)->size()));
return Status::OK();
}
Status AllocateEmptyBitmap(int64_t length, std::shared_ptr<Buffer>* out) {
return AllocateEmptyBitmap(default_memory_pool(), length, out);
}
Status ConcatenateBuffers(const std::vector<std::shared_ptr<Buffer>>& buffers,
MemoryPool* pool, std::shared_ptr<Buffer>* out) {
int64_t out_length = 0;
for (const auto& buffer : buffers) {
out_length += buffer->size();
}
RETURN_NOT_OK(AllocateBuffer(pool, out_length, out));
auto out_data = (*out)->mutable_data();
for (const auto& buffer : buffers) {
std::memcpy(out_data, buffer->data(), buffer->size());
out_data += buffer->size();
}
return Status::OK();
}
} // namespace arrow