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684b7a999f
* Dump: Use mholt/archive/v3 to support tar including many compressions Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: Allow dump output to stdout Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: Fixed bug present since #6677 where SessionConfig.Provider is never "file" Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: never pack RepoRootPath, LFS.ContentPath and LogRootPath when they are below AppDataPath Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: also dump LFS (fixes #10058) Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Dump: never dump CustomPath if CustomPath is a subdir of or equal to AppDataPath (fixes #10365) Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * Use log.Info instead of fmt.Fprintf Signed-off-by: Philipp Homann <homann.philipp@googlemail.com> * import ordering * make fmt Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io> Co-authored-by: Matti R <matti@mdranta.net>
197 lines
5.3 KiB
Go
Vendored
197 lines
5.3 KiB
Go
Vendored
package brotli
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const fastOnePassCompressionQuality = 0
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const fastTwoPassCompressionQuality = 1
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const zopflificationQuality = 10
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const hqZopflificationQuality = 11
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const maxQualityForStaticEntropyCodes = 2
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const minQualityForBlockSplit = 4
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const minQualityForNonzeroDistanceParams = 4
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const minQualityForOptimizeHistograms = 4
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const minQualityForExtensiveReferenceSearch = 5
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const minQualityForContextModeling = 5
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const minQualityForHqContextModeling = 7
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const minQualityForHqBlockSplitting = 10
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/* For quality below MIN_QUALITY_FOR_BLOCK_SPLIT there is no block splitting,
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so we buffer at most this much literals and commands. */
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const maxNumDelayedSymbols = 0x2FFF
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/* Returns hash-table size for quality levels 0 and 1. */
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func maxHashTableSize(quality int) uint {
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if quality == fastOnePassCompressionQuality {
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return 1 << 15
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} else {
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return 1 << 17
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}
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}
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/* The maximum length for which the zopflification uses distinct distances. */
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const maxZopfliLenQuality10 = 150
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const maxZopfliLenQuality11 = 325
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/* Do not thoroughly search when a long copy is found. */
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const longCopyQuickStep = 16384
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func maxZopfliLen(params *encoderParams) uint {
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if params.quality <= 10 {
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return maxZopfliLenQuality10
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} else {
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return maxZopfliLenQuality11
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}
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}
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/* Number of best candidates to evaluate to expand Zopfli chain. */
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func maxZopfliCandidates(params *encoderParams) uint {
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if params.quality <= 10 {
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return 1
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} else {
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return 5
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}
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}
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func sanitizeParams(params *encoderParams) {
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params.quality = brotli_min_int(maxQuality, brotli_max_int(minQuality, params.quality))
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if params.quality <= maxQualityForStaticEntropyCodes {
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params.large_window = false
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}
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if params.lgwin < minWindowBits {
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params.lgwin = minWindowBits
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} else {
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var max_lgwin int
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if params.large_window {
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max_lgwin = largeMaxWindowBits
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} else {
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max_lgwin = maxWindowBits
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}
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if params.lgwin > uint(max_lgwin) {
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params.lgwin = uint(max_lgwin)
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}
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}
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}
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/* Returns optimized lg_block value. */
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func computeLgBlock(params *encoderParams) int {
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var lgblock int = params.lgblock
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if params.quality == fastOnePassCompressionQuality || params.quality == fastTwoPassCompressionQuality {
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lgblock = int(params.lgwin)
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} else if params.quality < minQualityForBlockSplit {
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lgblock = 14
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} else if lgblock == 0 {
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lgblock = 16
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if params.quality >= 9 && params.lgwin > uint(lgblock) {
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lgblock = brotli_min_int(18, int(params.lgwin))
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}
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} else {
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lgblock = brotli_min_int(maxInputBlockBits, brotli_max_int(minInputBlockBits, lgblock))
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}
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return lgblock
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}
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/* Returns log2 of the size of main ring buffer area.
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Allocate at least lgwin + 1 bits for the ring buffer so that the newly
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added block fits there completely and we still get lgwin bits and at least
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read_block_size_bits + 1 bits because the copy tail length needs to be
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smaller than ring-buffer size. */
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func computeRbBits(params *encoderParams) int {
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return 1 + brotli_max_int(int(params.lgwin), params.lgblock)
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}
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func maxMetablockSize(params *encoderParams) uint {
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var bits int = brotli_min_int(computeRbBits(params), maxInputBlockBits)
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return uint(1) << uint(bits)
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}
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/* When searching for backward references and have not seen matches for a long
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time, we can skip some match lookups. Unsuccessful match lookups are very
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expensive and this kind of a heuristic speeds up compression quite a lot.
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At first 8 byte strides are taken and every second byte is put to hasher.
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After 4x more literals stride by 16 bytes, every put 4-th byte to hasher.
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Applied only to qualities 2 to 9. */
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func literalSpreeLengthForSparseSearch(params *encoderParams) uint {
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if params.quality < 9 {
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return 64
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} else {
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return 512
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}
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}
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func chooseHasher(params *encoderParams, hparams *hasherParams) {
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if params.quality > 9 {
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hparams.type_ = 10
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} else if params.quality == 4 && params.size_hint >= 1<<20 {
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hparams.type_ = 54
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} else if params.quality < 5 {
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hparams.type_ = params.quality
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} else if params.lgwin <= 16 {
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if params.quality < 7 {
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hparams.type_ = 40
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} else if params.quality < 9 {
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hparams.type_ = 41
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} else {
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hparams.type_ = 42
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}
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} else if params.size_hint >= 1<<20 && params.lgwin >= 19 {
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hparams.type_ = 6
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hparams.block_bits = params.quality - 1
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hparams.bucket_bits = 15
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hparams.hash_len = 5
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if params.quality < 7 {
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hparams.num_last_distances_to_check = 4
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} else if params.quality < 9 {
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hparams.num_last_distances_to_check = 10
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} else {
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hparams.num_last_distances_to_check = 16
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}
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} else {
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hparams.type_ = 5
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hparams.block_bits = params.quality - 1
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if params.quality < 7 {
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hparams.bucket_bits = 14
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} else {
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hparams.bucket_bits = 15
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}
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if params.quality < 7 {
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hparams.num_last_distances_to_check = 4
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} else if params.quality < 9 {
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hparams.num_last_distances_to_check = 10
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} else {
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hparams.num_last_distances_to_check = 16
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}
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}
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if params.lgwin > 24 {
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/* Different hashers for large window brotli: not for qualities <= 2,
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these are too fast for large window. Not for qualities >= 10: their
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hasher already works well with large window. So the changes are:
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H3 --> H35: for quality 3.
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H54 --> H55: for quality 4 with size hint > 1MB
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H6 --> H65: for qualities 5, 6, 7, 8, 9. */
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if hparams.type_ == 3 {
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hparams.type_ = 35
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}
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if hparams.type_ == 54 {
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hparams.type_ = 55
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}
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if hparams.type_ == 6 {
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hparams.type_ = 65
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}
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}
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}
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