From 72c187011a160ef63dc099bee866c5895808b8f2 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Sat, 8 Dec 2018 16:27:55 +0100 Subject: define some structs --- hash/hash.go | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++ testdata/aliases.db | Bin 0 -> 65536 bytes 2 files changed, 77 insertions(+) create mode 100644 testdata/aliases.db diff --git a/hash/hash.go b/hash/hash.go index 7adc22f..f84edeb 100644 --- a/hash/hash.go +++ b/hash/hash.go @@ -1 +1,78 @@ package hash + +type Action int + +// Operations +const ( + HashGet Action = iota + HashPut + HashPutNew + HashDelete + HashFirst + HashNext +) + +const ( + BufMod = 1 << iota + BufDisk + BufBucket + BufPin +) + +type BufHead struct { + Prev *BufHead // LRU links + Next *BufHead // LRU links + Ovrlf *BufHead // Overflow page buffer header + Addr uint32 // Address of this page + Page []byte // Actual page data + Flags byte +} + +type Segment *BufHead + +// HTab is memroy resident data structure +type HTab struct { + Hdr HashHdr // Header + NSegs int // Number of allocated segments + ExSegs int // Number of extra allocated + Hash func(interface{}, int64) uint32 // Hash function + Flags int // Flag values + FP int // File pointer + TmpBuf []byte // Temprory Buffer for BIG data + TmpKey []byte // Temprory Buffer for BIG keys + CPage BufHead // Currrent page + CBucket int // Current bucket + Err int // Error Number -- for DBM compatibility + NewFile int // Indicates if fd is backing store or not + SaveFile int // Indicates whether we need to flush file at exit + Mapp [nCached]uint32 // Pointers to page maps + NMaps int // Initial number of bitmaps + NBufs int // Number of buffers left to allocate + BufHead BufHead // Header of buffer lru list + Dir Segment // Hash Bucket directory +} + +const nCached = 32 // number of bit maps and spare points + +// HashHdr holds hash table invormation +type HashHdr struct { + Magic int32 // Magic NO for hash tables + Version int32 // Version ID + LOrder uint32 // Byte Order + BSize int32 // Bucket/Page Size + BShift int32 // Bucket shift + DSize int32 // Directory Size + SSize int32 // Segment Size + SShift int32 // Segment shift + OvflPoint int32 // Where overflow pages are being allocated + LastFreed int32 // Last overflow page freed + MaxBucket int32 // ID of Maximum bucket in use + HighMask int32 // Mask to modulo into entire table + LowMask int32 // Mask to modulo into lower half of table + FFactor int32 // Fill factor + NKeys int32 // Number of keys in hash table + HdrPages int32 // Size of table header + HCharkey int32 // value of hash(CHARKEY) + Spares [nCached]int32 // spare pages for overflow + Bitmaps [nCached]uint16 // address of overflow page bitmaps +} diff --git a/testdata/aliases.db b/testdata/aliases.db new file mode 100644 index 0000000..0fb69a5 Binary files /dev/null and b/testdata/aliases.db differ -- cgit v1.2.3