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// Copyright (c) 2017 Cloudflare, Inc. and contributors
// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#pragma once
#include <kj/io.h>
#include <kj/async-io.h>
#include <zlib.h>
namespace kj {
namespace _ { // private
class GzipOutputContext final {
public:
GzipOutputContext(kj::Maybe<int> compressionLevel);
~GzipOutputContext() noexcept(false);
KJ_DISALLOW_COPY(GzipOutputContext);
void setInput(const void* in, size_t size);
kj::Tuple<bool, kj::ArrayPtr<const byte>> pumpOnce(int flush);
private:
bool compressing;
z_stream ctx = {};
byte buffer[4096];
void fail(int result);
};
} // namespace _ (private)
class GzipInputStream final: public InputStream {
public:
GzipInputStream(InputStream& inner);
~GzipInputStream() noexcept(false);
KJ_DISALLOW_COPY(GzipInputStream);
size_t tryRead(void* buffer, size_t minBytes, size_t maxBytes) override;
private:
InputStream& inner;
z_stream ctx = {};
bool atValidEndpoint = false;
byte buffer[4096];
size_t readImpl(byte* buffer, size_t minBytes, size_t maxBytes, size_t alreadyRead);
};
class GzipOutputStream final: public OutputStream {
public:
enum { DECOMPRESS };
GzipOutputStream(OutputStream& inner, int compressionLevel = Z_DEFAULT_COMPRESSION);
GzipOutputStream(OutputStream& inner, decltype(DECOMPRESS));
~GzipOutputStream() noexcept(false);
KJ_DISALLOW_COPY(GzipOutputStream);
void write(const void* buffer, size_t size) override;
using OutputStream::write;
inline void flush() {
pump(Z_SYNC_FLUSH);
}
private:
OutputStream& inner;
_::GzipOutputContext ctx;
void pump(int flush);
};
class GzipAsyncInputStream final: public AsyncInputStream {
public:
GzipAsyncInputStream(AsyncInputStream& inner);
~GzipAsyncInputStream() noexcept(false);
KJ_DISALLOW_COPY(GzipAsyncInputStream);
Promise<size_t> tryRead(void* buffer, size_t minBytes, size_t maxBytes) override;
private:
AsyncInputStream& inner;
z_stream ctx = {};
bool atValidEndpoint = false;
byte buffer[4096];
Promise<size_t> readImpl(byte* buffer, size_t minBytes, size_t maxBytes, size_t alreadyRead);
};
class GzipAsyncOutputStream final: public AsyncOutputStream {
public:
enum { DECOMPRESS };
GzipAsyncOutputStream(AsyncOutputStream& inner, int compressionLevel = Z_DEFAULT_COMPRESSION);
GzipAsyncOutputStream(AsyncOutputStream& inner, decltype(DECOMPRESS));
KJ_DISALLOW_COPY(GzipAsyncOutputStream);
Promise<void> write(const void* buffer, size_t size) override;
Promise<void> write(ArrayPtr<const ArrayPtr<const byte>> pieces) override;
inline Promise<void> flush() {
return pump(Z_SYNC_FLUSH);
}
// Call if you need to flush a stream at an arbitrary data point.
Promise<void> end() {
return pump(Z_FINISH);
}
// Must call to flush and finish the stream, since some data may be buffered.
//
// TODO(cleanup): This should be a virtual method on AsyncOutputStream.
private:
AsyncOutputStream& inner;
_::GzipOutputContext ctx;
kj::Promise<void> pump(int flush);
};
} // namespace kj