mirror of
https://github.com/aykhans/AzSuicideDataVisualization.git
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119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// Compressed stream implementations
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#pragma once
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#include <memory>
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#include <string>
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#include "arrow/io/concurrency.h"
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#include "arrow/io/interfaces.h"
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#include "arrow/util/visibility.h"
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namespace arrow {
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class MemoryPool;
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class Status;
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namespace util {
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class Codec;
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} // namespace util
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namespace io {
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class ARROW_EXPORT CompressedOutputStream : public OutputStream {
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public:
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~CompressedOutputStream() override;
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/// \brief Create a compressed output stream wrapping the given output stream.
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static Result<std::shared_ptr<CompressedOutputStream>> Make(
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util::Codec* codec, const std::shared_ptr<OutputStream>& raw,
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MemoryPool* pool = default_memory_pool());
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// OutputStream interface
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/// \brief Close the compressed output stream. This implicitly closes the
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/// underlying raw output stream.
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Status Close() override;
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Status Abort() override;
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bool closed() const override;
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Result<int64_t> Tell() const override;
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Status Write(const void* data, int64_t nbytes) override;
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/// \cond FALSE
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using Writable::Write;
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/// \endcond
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Status Flush() override;
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/// \brief Return the underlying raw output stream.
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std::shared_ptr<OutputStream> raw() const;
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private:
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ARROW_DISALLOW_COPY_AND_ASSIGN(CompressedOutputStream);
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CompressedOutputStream() = default;
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class ARROW_NO_EXPORT Impl;
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std::unique_ptr<Impl> impl_;
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};
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class ARROW_EXPORT CompressedInputStream
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: public internal::InputStreamConcurrencyWrapper<CompressedInputStream> {
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public:
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~CompressedInputStream() override;
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/// \brief Create a compressed input stream wrapping the given input stream.
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static Result<std::shared_ptr<CompressedInputStream>> Make(
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util::Codec* codec, const std::shared_ptr<InputStream>& raw,
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MemoryPool* pool = default_memory_pool());
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// InputStream interface
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bool closed() const override;
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Result<std::shared_ptr<const KeyValueMetadata>> ReadMetadata() override;
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Future<std::shared_ptr<const KeyValueMetadata>> ReadMetadataAsync(
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const IOContext& io_context) override;
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/// \brief Return the underlying raw input stream.
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std::shared_ptr<InputStream> raw() const;
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private:
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friend InputStreamConcurrencyWrapper<CompressedInputStream>;
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ARROW_DISALLOW_COPY_AND_ASSIGN(CompressedInputStream);
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CompressedInputStream() = default;
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/// \brief Close the compressed input stream. This implicitly closes the
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/// underlying raw input stream.
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Status DoClose();
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Status DoAbort() override;
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Result<int64_t> DoTell() const;
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Result<int64_t> DoRead(int64_t nbytes, void* out);
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Result<std::shared_ptr<Buffer>> DoRead(int64_t nbytes);
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class ARROW_NO_EXPORT Impl;
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std::unique_ptr<Impl> impl_;
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};
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} // namespace io
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} // namespace arrow
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