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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <cmath>
#include <cstdint>
#include <cstddef>
#include <cstring>
namespace vespalib::compression {
struct CompressionConfig {
enum Type : uint8_t {
NONE = 0,
NONE_MULTI = 1,
HISTORIC_2 = 2,
HISTORIC_3 = 3,
HISTORIC_4 = 4,
UNCOMPRESSABLE = 5,
LZ4 = 6,
ZSTD = 7
};
CompressionConfig() noexcept
: CompressionConfig(NONE, 0, 90) {}
CompressionConfig(Type t) noexcept
: CompressionConfig(t, 9, 90) {}
CompressionConfig(Type t, uint8_t level, uint8_t minRes) noexcept
: CompressionConfig(t, level, minRes, 0) {}
CompressionConfig(Type t, uint8_t lvl, uint8_t minRes, size_t minSz) noexcept
: minSize(minSz), type(t), compressionLevel(lvl), threshold(minRes) {}
bool operator==(const CompressionConfig& o) const noexcept {
return (type == o.type
&& compressionLevel == o.compressionLevel
&& threshold == o.threshold);
}
bool operator!=(const CompressionConfig& o) const noexcept {
return !operator==(o);
}
static Type toType(uint32_t val) noexcept {
switch (val) {
case 1: return NONE_MULTI;
case 2: return HISTORIC_2;
case 3: return HISTORIC_3;
case 4: return HISTORIC_4;
case 5: return UNCOMPRESSABLE;
case 6: return LZ4;
case 7: return ZSTD;
default: return NONE;
}
}
static Type toType(const char * val) noexcept {
if (strncasecmp(val, "lz4", 3) == 0) {
return LZ4;
} if (strncasecmp(val, "zstd", 4) == 0) {
return ZSTD;
}
return NONE;
}
static bool isCompressed(Type type) noexcept {
return (type != CompressionConfig::NONE &&
type != CompressionConfig::UNCOMPRESSABLE);
}
bool useCompression() const noexcept { return isCompressed(type); }
uint32_t minSize;
Type type;
uint8_t compressionLevel;
uint8_t threshold;
};
}
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