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388 lines
10 KiB
Go
388 lines
10 KiB
Go
package gozstd
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/*
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#cgo CFLAGS: -O3
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#define ZSTD_STATIC_LINKING_ONLY
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#include "zstd.h"
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#include "zstd_errors.h"
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#include <stdint.h> // for uintptr_t
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// The following *_wrapper functions allow avoiding memory allocations
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// durting calls from Go.
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// See https://github.com/golang/go/issues/24450 .
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static size_t ZSTD_compressCCtx_wrapper(ZSTD_CCtx* ctx, uintptr_t dst, size_t dstCapacity, uintptr_t src, size_t srcSize, int compressionLevel) {
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return ZSTD_compressCCtx(ctx, (void*)dst, dstCapacity, (const void*)src, srcSize, compressionLevel);
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}
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static size_t ZSTD_compress_usingCDict_wrapper(ZSTD_CCtx* ctx, uintptr_t dst, size_t dstCapacity, uintptr_t src, size_t srcSize, const ZSTD_CDict* cdict) {
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return ZSTD_compress_usingCDict(ctx, (void*)dst, dstCapacity, (const void*)src, srcSize, cdict);
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}
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static size_t ZSTD_decompressDCtx_wrapper(ZSTD_DCtx* ctx, uintptr_t dst, size_t dstCapacity, uintptr_t src, size_t srcSize) {
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return ZSTD_decompressDCtx(ctx, (void*)dst, dstCapacity, (const void*)src, srcSize);
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}
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static size_t ZSTD_decompress_usingDDict_wrapper(ZSTD_DCtx* ctx, uintptr_t dst, size_t dstCapacity, uintptr_t src, size_t srcSize, const ZSTD_DDict *ddict) {
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return ZSTD_decompress_usingDDict(ctx, (void*)dst, dstCapacity, (const void*)src, srcSize, ddict);
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}
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static unsigned long long ZSTD_getFrameContentSize_wrapper(uintptr_t src, size_t srcSize) {
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return ZSTD_getFrameContentSize((const void*)src, srcSize);
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}
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*/
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import "C"
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import (
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"fmt"
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"io"
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"runtime"
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"sync"
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"unsafe"
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)
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// DefaultCompressionLevel is the default compression level.
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const DefaultCompressionLevel = 3 // Obtained from ZSTD_CLEVEL_DEFAULT.
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// Compress appends compressed src to dst and returns the result.
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func Compress(dst, src []byte) []byte {
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return compressDictLevel(dst, src, nil, DefaultCompressionLevel)
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}
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// CompressLevel appends compressed src to dst and returns the result.
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//
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// The given compressionLevel is used for the compression.
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func CompressLevel(dst, src []byte, compressionLevel int) []byte {
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return compressDictLevel(dst, src, nil, compressionLevel)
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}
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// CompressDict appends compressed src to dst and returns the result.
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//
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// The given dictionary is used for the compression.
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func CompressDict(dst, src []byte, cd *CDict) []byte {
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return compressDictLevel(dst, src, cd, 0)
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}
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func compressDictLevel(dst, src []byte, cd *CDict, compressionLevel int) []byte {
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concurrencyLimitCh <- struct{}{}
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var cctx, cctxDict *cctxWrapper
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if cd == nil {
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cctx = cctxPool.Get().(*cctxWrapper)
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} else {
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cctxDict = cctxDictPool.Get().(*cctxWrapper)
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}
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dst = compress(cctx, cctxDict, dst, src, cd, compressionLevel)
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if cd == nil {
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cctxPool.Put(cctx)
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} else {
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cctxDictPool.Put(cctxDict)
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}
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<-concurrencyLimitCh
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return dst
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}
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var cctxPool = &sync.Pool{
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New: newCCtx,
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}
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var cctxDictPool = &sync.Pool{
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New: newCCtx,
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}
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func newCCtx() interface{} {
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cctx := C.ZSTD_createCCtx()
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cw := &cctxWrapper{
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cctx: cctx,
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}
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runtime.SetFinalizer(cw, freeCCtx)
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return cw
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}
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func freeCCtx(cw *cctxWrapper) {
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C.ZSTD_freeCCtx(cw.cctx)
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cw.cctx = nil
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}
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type cctxWrapper struct {
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cctx *C.ZSTD_CCtx
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}
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func compress(cctx, cctxDict *cctxWrapper, dst, src []byte, cd *CDict, compressionLevel int) []byte {
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if len(src) == 0 {
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return dst
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}
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dstLen := len(dst)
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if cap(dst) > dstLen {
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// Fast path - try compressing without dst resize.
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result := compressInternal(cctx, cctxDict, dst[dstLen:cap(dst)], src, cd, compressionLevel, false)
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compressedSize := int(result)
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if compressedSize >= 0 {
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// All OK.
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return dst[:dstLen+compressedSize]
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}
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if C.ZSTD_getErrorCode(result) != C.ZSTD_error_dstSize_tooSmall {
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// Unexpected error.
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panic(fmt.Errorf("BUG: unexpected error during compression with cd=%p: %s", cd, errStr(result)))
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}
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}
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// Slow path - resize dst to fit compressed data.
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compressBound := int(C.ZSTD_compressBound(C.size_t(len(src)))) + 1
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if n := dstLen + compressBound - cap(dst) + dstLen; n > 0 {
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// This should be optimized since go 1.11 - see https://golang.org/doc/go1.11#performance-compiler.
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dst = append(dst[:cap(dst)], make([]byte, n)...)
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}
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result := compressInternal(cctx, cctxDict, dst[dstLen:dstLen+compressBound], src, cd, compressionLevel, true)
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compressedSize := int(result)
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return dst[:dstLen+compressedSize]
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}
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func compressInternal(cctx, cctxDict *cctxWrapper, dst, src []byte, cd *CDict, compressionLevel int, mustSucceed bool) C.size_t {
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if cd != nil {
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result := C.ZSTD_compress_usingCDict_wrapper(cctxDict.cctx,
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C.uintptr_t(uintptr(unsafe.Pointer(&dst[0]))),
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C.size_t(cap(dst)),
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C.uintptr_t(uintptr(unsafe.Pointer(&src[0]))),
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C.size_t(len(src)),
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cd.p)
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// Prevent from GC'ing of dst and src during CGO call above.
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runtime.KeepAlive(dst)
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runtime.KeepAlive(src)
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if mustSucceed {
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ensureNoError("ZSTD_compress_usingCDict_wrapper", result)
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}
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return result
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}
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result := C.ZSTD_compressCCtx_wrapper(cctx.cctx,
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C.uintptr_t(uintptr(unsafe.Pointer(&dst[0]))),
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C.size_t(cap(dst)),
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C.uintptr_t(uintptr(unsafe.Pointer(&src[0]))),
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C.size_t(len(src)),
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C.int(compressionLevel))
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// Prevent from GC'ing of dst and src during CGO call above.
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runtime.KeepAlive(dst)
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runtime.KeepAlive(src)
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if mustSucceed {
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ensureNoError("ZSTD_compressCCtx_wrapper", result)
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}
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return result
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}
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// Decompress appends decompressed src to dst and returns the result.
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func Decompress(dst, src []byte) ([]byte, error) {
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return DecompressDict(dst, src, nil)
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}
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// DecompressDict appends decompressed src to dst and returns the result.
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//
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// The given dictionary dd is used for the decompression.
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func DecompressDict(dst, src []byte, dd *DDict) ([]byte, error) {
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concurrencyLimitCh <- struct{}{}
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var dctx, dctxDict *dctxWrapper
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if dd == nil {
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dctx = dctxPool.Get().(*dctxWrapper)
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} else {
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dctxDict = dctxDictPool.Get().(*dctxWrapper)
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}
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var err error
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dst, err = decompress(dctx, dctxDict, dst, src, dd)
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if dd == nil {
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dctxPool.Put(dctx)
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} else {
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dctxDictPool.Put(dctxDict)
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}
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<-concurrencyLimitCh
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return dst, err
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}
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var dctxPool = &sync.Pool{
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New: newDCtx,
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}
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var dctxDictPool = &sync.Pool{
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New: newDCtx,
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}
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func newDCtx() interface{} {
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dctx := C.ZSTD_createDCtx()
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dw := &dctxWrapper{
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dctx: dctx,
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}
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runtime.SetFinalizer(dw, freeDCtx)
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return dw
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}
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func freeDCtx(dw *dctxWrapper) {
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C.ZSTD_freeDCtx(dw.dctx)
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dw.dctx = nil
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}
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type dctxWrapper struct {
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dctx *C.ZSTD_DCtx
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}
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func decompress(dctx, dctxDict *dctxWrapper, dst, src []byte, dd *DDict) ([]byte, error) {
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if len(src) == 0 {
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return dst, nil
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}
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dstLen := len(dst)
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if cap(dst)-dstLen >= len(src) {
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// Fast path - try decompressing without dst resize.
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result := decompressInternal(dctx, dctxDict, dst[dstLen:cap(dst)], src, dd)
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decompressedSize := int(result)
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if decompressedSize >= 0 {
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// All OK.
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return dst[:dstLen+decompressedSize], nil
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}
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if C.ZSTD_getErrorCode(result) != C.ZSTD_error_dstSize_tooSmall {
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// Error during decompression.
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return dst[:dstLen], fmt.Errorf("decompression error: %s", errStr(result))
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}
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}
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// Slow path - resize dst to fit decompressed data.
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decompressBound := int(C.ZSTD_getFrameContentSize_wrapper(
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C.uintptr_t(uintptr(unsafe.Pointer(&src[0]))), C.size_t(len(src))))
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// Prevent from GC'ing of src during CGO call above.
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runtime.KeepAlive(src)
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switch uint64(decompressBound) {
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case uint64(C.ZSTD_CONTENTSIZE_UNKNOWN):
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return streamDecompress(dst, src, dd)
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case uint64(C.ZSTD_CONTENTSIZE_ERROR):
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return dst, fmt.Errorf("cannot decompress invalid src")
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}
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decompressBound++
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if n := dstLen + decompressBound - cap(dst); n > 0 {
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// This should be optimized since go 1.11 - see https://golang.org/doc/go1.11#performance-compiler.
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dst = append(dst[:cap(dst)], make([]byte, n)...)
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}
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result := decompressInternal(dctx, dctxDict, dst[dstLen:dstLen+decompressBound], src, dd)
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decompressedSize := int(result)
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if decompressedSize >= 0 {
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// All OK.
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return dst[:dstLen+decompressedSize], nil
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}
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// Error during decompression.
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return dst[:dstLen], fmt.Errorf("decompression error: %s", errStr(result))
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}
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func decompressInternal(dctx, dctxDict *dctxWrapper, dst, src []byte, dd *DDict) C.size_t {
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var n C.size_t
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if dd != nil {
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n = C.ZSTD_decompress_usingDDict_wrapper(dctxDict.dctx,
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C.uintptr_t(uintptr(unsafe.Pointer(&dst[0]))),
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C.size_t(cap(dst)),
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C.uintptr_t(uintptr(unsafe.Pointer(&src[0]))),
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C.size_t(len(src)),
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dd.p)
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} else {
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n = C.ZSTD_decompressDCtx_wrapper(dctx.dctx,
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C.uintptr_t(uintptr(unsafe.Pointer(&dst[0]))),
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C.size_t(cap(dst)),
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C.uintptr_t(uintptr(unsafe.Pointer(&src[0]))),
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C.size_t(len(src)))
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}
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// Prevent from GC'ing of dst and src during CGO calls above.
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runtime.KeepAlive(dst)
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runtime.KeepAlive(src)
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return n
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}
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var concurrencyLimitCh = func() chan struct{} {
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gomaxprocs := runtime.GOMAXPROCS(-1)
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return make(chan struct{}, gomaxprocs)
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}()
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func errStr(result C.size_t) string {
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errCode := C.ZSTD_getErrorCode(result)
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errCStr := C.ZSTD_getErrorString(errCode)
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return C.GoString(errCStr)
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}
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func ensureNoError(funcName string, result C.size_t) {
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if int(result) >= 0 {
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// Fast path - avoid calling C function.
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return
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}
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if C.ZSTD_getErrorCode(result) != 0 {
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panic(fmt.Errorf("BUG: unexpected error in %s: %s", funcName, errStr(result)))
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}
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}
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func streamDecompress(dst, src []byte, dd *DDict) ([]byte, error) {
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sd := getStreamDecompressor(dd)
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sd.dst = dst
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sd.src = src
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_, err := sd.zr.WriteTo(sd)
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dst = sd.dst
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putStreamDecompressor(sd)
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return dst, err
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}
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type streamDecompressor struct {
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dst []byte
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src []byte
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srcOffset int
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zr *Reader
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}
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type srcReader streamDecompressor
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func (sr *srcReader) Read(p []byte) (int, error) {
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sd := (*streamDecompressor)(sr)
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n := copy(p, sd.src[sd.srcOffset:])
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sd.srcOffset += n
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if n < len(p) {
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return n, io.EOF
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}
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return n, nil
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}
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func (sd *streamDecompressor) Write(p []byte) (int, error) {
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sd.dst = append(sd.dst, p...)
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return len(p), nil
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}
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func getStreamDecompressor(dd *DDict) *streamDecompressor {
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v := streamDecompressorPool.Get()
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if v == nil {
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sd := &streamDecompressor{
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zr: NewReader(nil),
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}
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v = sd
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}
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sd := v.(*streamDecompressor)
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sd.zr.Reset((*srcReader)(sd), dd)
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return sd
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}
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func putStreamDecompressor(sd *streamDecompressor) {
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sd.dst = nil
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sd.src = nil
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sd.srcOffset = 0
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sd.zr.Reset(nil, nil)
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streamDecompressorPool.Put(sd)
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}
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var streamDecompressorPool sync.Pool
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