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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 "contrib/libs/apache/arrow_next/cpp/src/arrow/io/transform.h"
#include <algorithm>
#include <cstring>
#include <mutex>
#include <random>
#include <thread>
#include <utility>
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/buffer.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/io/util_internal.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/result.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/status.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/logging.h"
namespace arrow20 {
namespace io {
struct TransformInputStream::Impl {
std::shared_ptr<InputStream> wrapped_;
TransformInputStream::TransformFunc transform_;
std::shared_ptr<Buffer> pending_;
int64_t pos_ = 0;
bool closed_ = false;
Impl(std::shared_ptr<InputStream> wrapped,
TransformInputStream::TransformFunc transform)
: wrapped_(std::move(wrapped)), transform_(std::move(transform)) {}
void Close() {
closed_ = true;
pending_.reset();
}
Status CheckClosed() const {
if (closed_) {
return Status::Invalid("Operation on closed file");
}
return Status::OK();
}
};
TransformInputStream::TransformInputStream(std::shared_ptr<InputStream> wrapped,
TransformInputStream::TransformFunc transform)
: impl_(new Impl{std::move(wrapped), std::move(transform)}) {}
TransformInputStream::~TransformInputStream() {}
Status TransformInputStream::Close() {
impl_->Close();
return impl_->wrapped_->Close();
}
Status TransformInputStream::Abort() { return impl_->wrapped_->Abort(); }
bool TransformInputStream::closed() const { return impl_->closed_; }
Result<std::shared_ptr<Buffer>> TransformInputStream::Read(int64_t nbytes) {
RETURN_NOT_OK(impl_->CheckClosed());
ARROW_ASSIGN_OR_RAISE(auto buf, AllocateResizableBuffer(nbytes));
ARROW_ASSIGN_OR_RAISE(auto bytes_read, this->Read(nbytes, buf->mutable_data()));
if (bytes_read < nbytes) {
RETURN_NOT_OK(buf->Resize(bytes_read, /*shrink_to_fit=*/true));
}
return std::shared_ptr<Buffer>(std::move(buf));
}
Result<int64_t> TransformInputStream::Read(int64_t nbytes, void* out) {
RETURN_NOT_OK(impl_->CheckClosed());
if (nbytes == 0) {
return 0;
}
int64_t avail_size = 0;
std::vector<std::shared_ptr<Buffer>> avail;
if (impl_->pending_) {
avail.push_back(impl_->pending_);
avail_size += impl_->pending_->size();
}
// Accumulate enough transformed data to satisfy read
while (avail_size < nbytes) {
ARROW_ASSIGN_OR_RAISE(auto buf, impl_->wrapped_->Read(nbytes));
const bool have_eof = (buf->size() == 0);
// Even if EOF is met, let the transform function run a last time
// (for example to flush internal buffers)
ARROW_ASSIGN_OR_RAISE(buf, impl_->transform_(std::move(buf)));
avail_size += buf->size();
avail.push_back(std::move(buf));
if (have_eof) {
break;
}
}
DCHECK(!avail.empty());
// Coalesce buffer data
uint8_t* out_data = reinterpret_cast<uint8_t*>(out);
int64_t copied_bytes = 0;
for (size_t i = 0; i < avail.size() - 1; ++i) {
// All buffers except the last fit fully into `nbytes`
const auto buf = std::move(avail[i]);
DCHECK_LE(buf->size(), nbytes);
memcpy(out_data, buf->data(), static_cast<size_t>(buf->size()));
out_data += buf->size();
nbytes -= buf->size();
copied_bytes += buf->size();
}
{
// Last buffer: splice into `out` and `pending_`
auto buf = std::move(avail.back());
const int64_t to_copy = std::min(buf->size(), nbytes);
memcpy(out_data, buf->data(), static_cast<size_t>(to_copy));
copied_bytes += to_copy;
if (buf->size() > to_copy) {
impl_->pending_ = SliceBuffer(std::move(buf), to_copy);
} else {
impl_->pending_.reset();
}
}
impl_->pos_ += copied_bytes;
return copied_bytes;
}
Result<int64_t> TransformInputStream::Tell() const {
RETURN_NOT_OK(impl_->CheckClosed());
return impl_->pos_;
}
Result<std::shared_ptr<const KeyValueMetadata>> TransformInputStream::ReadMetadata() {
RETURN_NOT_OK(impl_->CheckClosed());
return impl_->wrapped_->ReadMetadata();
}
Future<std::shared_ptr<const KeyValueMetadata>> TransformInputStream::ReadMetadataAsync(
const IOContext& io_context) {
RETURN_NOT_OK(impl_->CheckClosed());
return impl_->wrapped_->ReadMetadataAsync(io_context);
}
} // namespace io
} // namespace arrow20
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