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path: root/vendor/github.com/boltdb/bolt/page.go
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Diffstat (limited to 'vendor/github.com/boltdb/bolt/page.go')
-rw-r--r--vendor/github.com/boltdb/bolt/page.go197
1 files changed, 0 insertions, 197 deletions
diff --git a/vendor/github.com/boltdb/bolt/page.go b/vendor/github.com/boltdb/bolt/page.go
deleted file mode 100644
index cde403ae8..000000000
--- a/vendor/github.com/boltdb/bolt/page.go
+++ /dev/null
@@ -1,197 +0,0 @@
-package bolt
-
-import (
- "fmt"
- "os"
- "sort"
- "unsafe"
-)
-
-const pageHeaderSize = int(unsafe.Offsetof(((*page)(nil)).ptr))
-
-const minKeysPerPage = 2
-
-const branchPageElementSize = int(unsafe.Sizeof(branchPageElement{}))
-const leafPageElementSize = int(unsafe.Sizeof(leafPageElement{}))
-
-const (
- branchPageFlag = 0x01
- leafPageFlag = 0x02
- metaPageFlag = 0x04
- freelistPageFlag = 0x10
-)
-
-const (
- bucketLeafFlag = 0x01
-)
-
-type pgid uint64
-
-type page struct {
- id pgid
- flags uint16
- count uint16
- overflow uint32
- ptr uintptr
-}
-
-// typ returns a human readable page type string used for debugging.
-func (p *page) typ() string {
- if (p.flags & branchPageFlag) != 0 {
- return "branch"
- } else if (p.flags & leafPageFlag) != 0 {
- return "leaf"
- } else if (p.flags & metaPageFlag) != 0 {
- return "meta"
- } else if (p.flags & freelistPageFlag) != 0 {
- return "freelist"
- }
- return fmt.Sprintf("unknown<%02x>", p.flags)
-}
-
-// meta returns a pointer to the metadata section of the page.
-func (p *page) meta() *meta {
- return (*meta)(unsafe.Pointer(&p.ptr))
-}
-
-// leafPageElement retrieves the leaf node by index
-func (p *page) leafPageElement(index uint16) *leafPageElement {
- n := &((*[0x7FFFFFF]leafPageElement)(unsafe.Pointer(&p.ptr)))[index]
- return n
-}
-
-// leafPageElements retrieves a list of leaf nodes.
-func (p *page) leafPageElements() []leafPageElement {
- if p.count == 0 {
- return nil
- }
- return ((*[0x7FFFFFF]leafPageElement)(unsafe.Pointer(&p.ptr)))[:]
-}
-
-// branchPageElement retrieves the branch node by index
-func (p *page) branchPageElement(index uint16) *branchPageElement {
- return &((*[0x7FFFFFF]branchPageElement)(unsafe.Pointer(&p.ptr)))[index]
-}
-
-// branchPageElements retrieves a list of branch nodes.
-func (p *page) branchPageElements() []branchPageElement {
- if p.count == 0 {
- return nil
- }
- return ((*[0x7FFFFFF]branchPageElement)(unsafe.Pointer(&p.ptr)))[:]
-}
-
-// dump writes n bytes of the page to STDERR as hex output.
-func (p *page) hexdump(n int) {
- buf := (*[maxAllocSize]byte)(unsafe.Pointer(p))[:n]
- fmt.Fprintf(os.Stderr, "%x\n", buf)
-}
-
-type pages []*page
-
-func (s pages) Len() int { return len(s) }
-func (s pages) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
-func (s pages) Less(i, j int) bool { return s[i].id < s[j].id }
-
-// branchPageElement represents a node on a branch page.
-type branchPageElement struct {
- pos uint32
- ksize uint32
- pgid pgid
-}
-
-// key returns a byte slice of the node key.
-func (n *branchPageElement) key() []byte {
- buf := (*[maxAllocSize]byte)(unsafe.Pointer(n))
- return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos]))[:n.ksize]
-}
-
-// leafPageElement represents a node on a leaf page.
-type leafPageElement struct {
- flags uint32
- pos uint32
- ksize uint32
- vsize uint32
-}
-
-// key returns a byte slice of the node key.
-func (n *leafPageElement) key() []byte {
- buf := (*[maxAllocSize]byte)(unsafe.Pointer(n))
- return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos]))[:n.ksize:n.ksize]
-}
-
-// value returns a byte slice of the node value.
-func (n *leafPageElement) value() []byte {
- buf := (*[maxAllocSize]byte)(unsafe.Pointer(n))
- return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos+n.ksize]))[:n.vsize:n.vsize]
-}
-
-// PageInfo represents human readable information about a page.
-type PageInfo struct {
- ID int
- Type string
- Count int
- OverflowCount int
-}
-
-type pgids []pgid
-
-func (s pgids) Len() int { return len(s) }
-func (s pgids) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
-func (s pgids) Less(i, j int) bool { return s[i] < s[j] }
-
-// merge returns the sorted union of a and b.
-func (a pgids) merge(b pgids) pgids {
- // Return the opposite slice if one is nil.
- if len(a) == 0 {
- return b
- }
- if len(b) == 0 {
- return a
- }
- merged := make(pgids, len(a)+len(b))
- mergepgids(merged, a, b)
- return merged
-}
-
-// mergepgids copies the sorted union of a and b into dst.
-// If dst is too small, it panics.
-func mergepgids(dst, a, b pgids) {
- if len(dst) < len(a)+len(b) {
- panic(fmt.Errorf("mergepgids bad len %d < %d + %d", len(dst), len(a), len(b)))
- }
- // Copy in the opposite slice if one is nil.
- if len(a) == 0 {
- copy(dst, b)
- return
- }
- if len(b) == 0 {
- copy(dst, a)
- return
- }
-
- // Merged will hold all elements from both lists.
- merged := dst[:0]
-
- // Assign lead to the slice with a lower starting value, follow to the higher value.
- lead, follow := a, b
- if b[0] < a[0] {
- lead, follow = b, a
- }
-
- // Continue while there are elements in the lead.
- for len(lead) > 0 {
- // Merge largest prefix of lead that is ahead of follow[0].
- n := sort.Search(len(lead), func(i int) bool { return lead[i] > follow[0] })
- merged = append(merged, lead[:n]...)
- if n >= len(lead) {
- break
- }
-
- // Swap lead and follow.
- lead, follow = follow, lead[n:]
- }
-
- // Append what's left in follow.
- _ = append(merged, follow...)
-}