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gitea/vendor/github.com/andybalholm/brotli/prefix.go
PhilippHomann 684b7a999f
Dump: add output format tar and output to stdout (#10376)
* 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>
2020-06-05 16:47:39 -04:00

30 lines
1.3 KiB
Go
Vendored

package brotli
/* Copyright 2013 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
/* Functions for encoding of integers into prefix codes the amount of extra
bits, and the actual values of the extra bits. */
/* Here distance_code is an intermediate code, i.e. one of the special codes or
the actual distance increased by BROTLI_NUM_DISTANCE_SHORT_CODES - 1. */
func prefixEncodeCopyDistance(distance_code uint, num_direct_codes uint, postfix_bits uint, code *uint16, extra_bits *uint32) {
if distance_code < numDistanceShortCodes+num_direct_codes {
*code = uint16(distance_code)
*extra_bits = 0
return
} else {
var dist uint = (uint(1) << (postfix_bits + 2)) + (distance_code - numDistanceShortCodes - num_direct_codes)
var bucket uint = uint(log2FloorNonZero(dist) - 1)
var postfix_mask uint = (1 << postfix_bits) - 1
var postfix uint = dist & postfix_mask
var prefix uint = (dist >> bucket) & 1
var offset uint = (2 + prefix) << bucket
var nbits uint = bucket - postfix_bits
*code = uint16(nbits<<10 | (numDistanceShortCodes + num_direct_codes + ((2*(nbits-1) + prefix) << postfix_bits) + postfix))
*extra_bits = uint32((dist - offset) >> postfix_bits)
}
}