ec1f89217a
Full Mattermost server source with integrated Community Enterprise features. Includes vendor directory for offline/air-gapped builds. Structure: - enterprise-impl/: Enterprise feature implementations - enterprise-community/: Init files that register implementations - enterprise/: Bridge imports (community_imports.go) - vendor/: All dependencies for offline builds Build (online): go build ./cmd/mattermost Build (offline/air-gapped): go build -mod=vendor ./cmd/mattermost 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
75 lines
1.4 KiB
Go
75 lines
1.4 KiB
Go
// SPDX-FileCopyrightText: 2024 Shun Sakai
|
|
//
|
|
// SPDX-License-Identifier: Apache-2.0 OR MIT
|
|
|
|
// Package lzip implements the [lzip compressed format].
|
|
//
|
|
// The package supports version 1 of the lzip format.
|
|
//
|
|
// [lzip compressed format]: https://www.nongnu.org/lzip/manual/lzip_manual.html#File-format
|
|
package lzip
|
|
|
|
import (
|
|
"math/bits"
|
|
|
|
"github.com/ulikunitz/xz/lzma"
|
|
)
|
|
|
|
const (
|
|
headerSize = 6
|
|
trailerSize = 20
|
|
)
|
|
|
|
const magic = "LZIP"
|
|
const magicSize = 4
|
|
|
|
type version byte
|
|
|
|
const (
|
|
version0 version = iota
|
|
version1
|
|
)
|
|
|
|
// MinDictSize is the minimum dictionary size, which is 4 KiB.
|
|
const MinDictSize = lzma.MinDictCap
|
|
|
|
// MaxDictSize is the maximum dictionary size, which is 512 MiB.
|
|
const MaxDictSize = 1 << 29
|
|
|
|
// DefaultDictSize is the default dictionary size, which is 8 MiB.
|
|
const DefaultDictSize = 1 << 23
|
|
|
|
// MaxMemberSize is the maximum member size, which is 2 PiB.
|
|
const MaxMemberSize = 1 << 51
|
|
|
|
type header struct {
|
|
magic [magicSize]byte
|
|
version
|
|
dictSize byte
|
|
}
|
|
|
|
func newHeader(dictSize uint32) *header {
|
|
ds := bits.Len32(dictSize - 1)
|
|
|
|
if dictSize > MinDictSize {
|
|
base := 1 << dictSize
|
|
frac := base / 16
|
|
|
|
for i := 7; i >= 1; i-- {
|
|
if (base - (i * frac)) >= ds {
|
|
ds |= i << 5
|
|
}
|
|
}
|
|
}
|
|
|
|
z := &header{[magicSize]byte([]byte(magic)), version1, byte(ds)}
|
|
|
|
return z
|
|
}
|
|
|
|
type trailer struct {
|
|
crc uint32
|
|
dataSize uint64
|
|
memberSize uint64
|
|
}
|