0f37dce1ec
-added a compressor interface -added a zlib compressor -added windows support -added support to build as a DLL (sorry for the DLLX everywhere)
60 lines
1.3 KiB
C++
60 lines
1.3 KiB
C++
#pragma once
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#include <string>
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#include <cassert>
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#include <cstdint>
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#include <unordered_map>
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#include <memory>
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namespace leveldb {
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class DLLX Slice;
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class DLLX Compressor
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{
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public:
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uint64_t inputBytes = 0, compressedBytes = 0;
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//an ID that has to be unique across the whole system
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const char uniqueCompressionID;
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virtual ~Compressor() {}
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Compressor(char uniqueCompressionID) :
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uniqueCompressionID(uniqueCompressionID) {
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}
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double getAverageCompression() const
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{
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return inputBytes ? ((double)compressedBytes / (double)inputBytes) : 0;
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}
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void resetAverageCompressionStats() {
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inputBytes = compressedBytes = 0;
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}
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void compress(const char* input, size_t length, ::std::string& output) {
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compressImpl(input, length, output);
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inputBytes += length;
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compressedBytes += output.length();
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}
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void compress(const std::string& in, std::string& out) {
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compress(in.data(), in.length(), out);
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}
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virtual void compressImpl(const char* input, size_t length, ::std::string& output) const = 0;
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virtual bool decompress(const char* input, size_t length, ::std::string &output) const = 0;
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bool decompress(const std::string& input, ::std::string& output) const {
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return decompress(input.data(), input.length(), output);
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}
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protected:
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private:
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};
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} |