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130 lines
3.4 KiB
C++
130 lines
3.4 KiB
C++
// Copyright 2009 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Input and output classes for streaming brotli compression.
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#ifndef BROTLI_ENC_STREAMS_H_
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#define BROTLI_ENC_STREAMS_H_
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#include <stddef.h>
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#include <stdio.h>
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#include <string>
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namespace brotli {
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// Input interface for the compression routines.
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class BrotliIn {
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public:
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virtual ~BrotliIn() {}
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// Return a pointer to the next block of input of at most n bytes.
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// Return the actual length in *nread.
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// At end of data, return NULL. Don't return NULL if there is more data
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// to read, even if called with n == 0.
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// Read will only be called if some of its bytes are needed.
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virtual const void* Read(size_t n, size_t* nread) = 0;
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};
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// Output interface for the compression routines.
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class BrotliOut {
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public:
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virtual ~BrotliOut() {}
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// Write n bytes of data from buf.
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// Return true if all written, false otherwise.
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virtual bool Write(const void *buf, size_t n) = 0;
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};
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// Adapter class to make BrotliIn objects from raw memory.
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class BrotliMemIn : public BrotliIn {
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public:
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BrotliMemIn(const void* buf, int len);
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void Reset(const void* buf, int len);
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// returns the amount of data consumed
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int position() const { return pos_; }
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const void* Read(size_t n, size_t* OUTPUT) override;
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private:
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const void* buf_; // start of input buffer
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int len_; // length of input
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int pos_; // current read position within input
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};
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// Adapter class to make BrotliOut objects from raw memory.
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class BrotliMemOut : public BrotliOut {
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public:
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BrotliMemOut(void* buf, int len);
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void Reset(void* buf, int len);
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// returns the amount of data written
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int position() const { return pos_; }
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bool Write(const void* buf, size_t n) override;
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private:
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void* buf_; // start of output buffer
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int len_; // length of output
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int pos_; // current write position within output
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};
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// Adapter class to make BrotliOut objects from a string.
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class BrotliStringOut : public BrotliOut {
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public:
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// Create a writer that appends its data to buf.
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// buf->size() will grow to at most max_size
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// buf is expected to be empty when constructing BrotliStringOut.
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BrotliStringOut(std::string* buf, int max_size);
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void Reset(std::string* buf, int max_len);
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bool Write(const void* buf, size_t n) override;
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private:
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std::string* buf_; // start of output buffer
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int max_size_; // max length of output
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};
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// Adapter class to make BrotliIn object from a file.
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class BrotliFileIn : public BrotliIn {
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public:
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BrotliFileIn(FILE* f, size_t max_read_size);
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~BrotliFileIn();
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const void* Read(size_t n, size_t* bytes_read) override;
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private:
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FILE* f_;
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void* buf_;
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size_t buf_size_;
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};
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// Adapter class to make BrotliOut object from a file.
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class BrotliFileOut : public BrotliOut {
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public:
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explicit BrotliFileOut(FILE* f);
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bool Write(const void* buf, size_t n) override;
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private:
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FILE* f_;
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};
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} // namespace brotli
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#endif // BROTLI_ENC_STREAMS_H_
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