479 lines
10 KiB
Go
479 lines
10 KiB
Go
|
// Copyright 2014 The Go Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
package hpack
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
)
|
||
|
|
|
||
|
|
// headerFieldTable implements a list of HeaderFields.
|
||
|
|
// This is used to implement the static and dynamic tables.
|
||
|
|
type headerFieldTable struct {
|
||
|
|
// For static tables, entries are never evicted.
|
||
|
|
//
|
||
|
|
// For dynamic tables, entries are evicted from ents[0] and added to the end.
|
||
|
|
// Each entry has a unique id that starts at one and increments for each
|
||
|
|
// entry that is added. This unique id is stable across evictions, meaning
|
||
|
|
// it can be used as a pointer to a specific entry. As in hpack, unique ids
|
||
|
|
// are 1-based. The unique id for ents[k] is k + evictCount + 1.
|
||
|
|
//
|
||
|
|
// Zero is not a valid unique id.
|
||
|
|
//
|
||
|
|
// evictCount should not overflow in any remotely practical situation. In
|
||
|
|
// practice, we will have one dynamic table per HTTP/2 connection. If we
|
||
|
|
// assume a very powerful server that handles 1M QPS per connection and each
|
||
|
|
// request adds (then evicts) 100 entries from the table, it would still take
|
||
|
|
// 2M years for evictCount to overflow.
|
||
|
|
ents []HeaderField
|
||
|
|
evictCount uint64
|
||
|
|
|
||
|
|
// byName maps a HeaderField name to the unique id of the newest entry with
|
||
|
|
// the same name. See above for a definition of "unique id".
|
||
|
|
byName map[string]uint64
|
||
|
|
|
||
|
|
// byNameValue maps a HeaderField name/value pair to the unique id of the newest
|
||
|
|
// entry with the same name and value. See above for a definition of "unique id".
|
||
|
|
byNameValue map[pairNameValue]uint64
|
||
|
|
}
|
||
|
|
|
||
|
|
type pairNameValue struct {
|
||
|
|
name, value string
|
||
|
|
}
|
||
|
|
|
||
|
|
func (t *headerFieldTable) init() {
|
||
|
|
t.byName = make(map[string]uint64)
|
||
|
|
t.byNameValue = make(map[pairNameValue]uint64)
|
||
|
|
}
|
||
|
|
|
||
|
|
// len reports the number of entries in the table.
|
||
|
|
func (t *headerFieldTable) len() int {
|
||
|
|
return len(t.ents)
|
||
|
|
}
|
||
|
|
|
||
|
|
// addEntry adds a new entry.
|
||
|
|
func (t *headerFieldTable) addEntry(f HeaderField) {
|
||
|
|
id := uint64(t.len()) + t.evictCount + 1
|
||
|
|
t.byName[f.Name] = id
|
||
|
|
t.byNameValue[pairNameValue{f.Name, f.Value}] = id
|
||
|
|
t.ents = append(t.ents, f)
|
||
|
|
}
|
||
|
|
|
||
|
|
// evictOldest evicts the n oldest entries in the table.
|
||
|
|
func (t *headerFieldTable) evictOldest(n int) {
|
||
|
|
if n > t.len() {
|
||
|
|
panic(fmt.Sprintf("evictOldest(%v) on table with %v entries", n, t.len()))
|
||
|
|
}
|
||
|
|
for k := 0; k < n; k++ {
|
||
|
|
f := t.ents[k]
|
||
|
|
id := t.evictCount + uint64(k) + 1
|
||
|
|
if t.byName[f.Name] == id {
|
||
|
|
delete(t.byName, f.Name)
|
||
|
|
}
|
||
|
|
if p := (pairNameValue{f.Name, f.Value}); t.byNameValue[p] == id {
|
||
|
|
delete(t.byNameValue, p)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
copy(t.ents, t.ents[n:])
|
||
|
|
for k := t.len() - n; k < t.len(); k++ {
|
||
|
|
t.ents[k] = HeaderField{} // so strings can be garbage collected
|
||
|
|
}
|
||
|
|
t.ents = t.ents[:t.len()-n]
|
||
|
|
if t.evictCount+uint64(n) < t.evictCount {
|
||
|
|
panic("evictCount overflow")
|
||
|
|
}
|
||
|
|
t.evictCount += uint64(n)
|
||
|
|
}
|
||
|
|
|
||
|
|
// search finds f in the table. If there is no match, i is 0.
|
||
|
|
// If both name and value match, i is the matched index and nameValueMatch
|
||
|
|
// becomes true. If only name matches, i points to that index and
|
||
|
|
// nameValueMatch becomes false.
|
||
|
|
//
|
||
|
|
// The returned index is a 1-based HPACK index. For dynamic tables, HPACK says
|
||
|
|
// that index 1 should be the newest entry, but t.ents[0] is the oldest entry,
|
||
|
|
// meaning t.ents is reversed for dynamic tables. Hence, when t is a dynamic
|
||
|
|
// table, the return value i actually refers to the entry t.ents[t.len()-i].
|
||
|
|
//
|
||
|
|
// All tables are assumed to be a dynamic tables except for the global
|
||
|
|
// staticTable pointer.
|
||
|
|
//
|
||
|
|
// See Section 2.3.3.
|
||
|
|
func (t *headerFieldTable) search(f HeaderField) (i uint64, nameValueMatch bool) {
|
||
|
|
if !f.Sensitive {
|
||
|
|
if id := t.byNameValue[pairNameValue{f.Name, f.Value}]; id != 0 {
|
||
|
|
return t.idToIndex(id), true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if id := t.byName[f.Name]; id != 0 {
|
||
|
|
return t.idToIndex(id), false
|
||
|
|
}
|
||
|
|
return 0, false
|
||
|
|
}
|
||
|
|
|
||
|
|
// idToIndex converts a unique id to an HPACK index.
|
||
|
|
// See Section 2.3.3.
|
||
|
|
func (t *headerFieldTable) idToIndex(id uint64) uint64 {
|
||
|
|
if id <= t.evictCount {
|
||
|
|
panic(fmt.Sprintf("id (%v) <= evictCount (%v)", id, t.evictCount))
|
||
|
|
}
|
||
|
|
k := id - t.evictCount - 1 // convert id to an index t.ents[k]
|
||
|
|
if t != staticTable {
|
||
|
|
return uint64(t.len()) - k // dynamic table
|
||
|
|
}
|
||
|
|
return k + 1
|
||
|
|
}
|
||
|
|
|
||
|
|
func pair(name, value string) HeaderField {
|
||
|
|
return HeaderField{Name: name, Value: value}
|
||
|
|
}
|
||
|
|
|
||
|
|
// http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-07#appendix-B
|
||
|
|
var staticTable = newStaticTable()
|
||
|
|
|
||
|
|
func newStaticTable() *headerFieldTable {
|
||
|
|
t := &headerFieldTable{}
|
||
|
|
t.init()
|
||
|
|
t.addEntry(pair(":authority", ""))
|
||
|
|
t.addEntry(pair(":method", "GET"))
|
||
|
|
t.addEntry(pair(":method", "POST"))
|
||
|
|
t.addEntry(pair(":path", "/"))
|
||
|
|
t.addEntry(pair(":path", "/index.html"))
|
||
|
|
t.addEntry(pair(":scheme", "http"))
|
||
|
|
t.addEntry(pair(":scheme", "https"))
|
||
|
|
t.addEntry(pair(":status", "200"))
|
||
|
|
t.addEntry(pair(":status", "204"))
|
||
|
|
t.addEntry(pair(":status", "206"))
|
||
|
|
t.addEntry(pair(":status", "304"))
|
||
|
|
t.addEntry(pair(":status", "400"))
|
||
|
|
t.addEntry(pair(":status", "404"))
|
||
|
|
t.addEntry(pair(":status", "500"))
|
||
|
|
t.addEntry(pair("accept-charset", ""))
|
||
|
|
t.addEntry(pair("accept-encoding", "gzip, deflate"))
|
||
|
|
t.addEntry(pair("accept-language", ""))
|
||
|
|
t.addEntry(pair("accept-ranges", ""))
|
||
|
|
t.addEntry(pair("accept", ""))
|
||
|
|
t.addEntry(pair("access-control-allow-origin", ""))
|
||
|
|
t.addEntry(pair("age", ""))
|
||
|
|
t.addEntry(pair("allow", ""))
|
||
|
|
t.addEntry(pair("authorization", ""))
|
||
|
|
t.addEntry(pair("cache-control", ""))
|
||
|
|
t.addEntry(pair("content-disposition", ""))
|
||
|
|
t.addEntry(pair("content-encoding", ""))
|
||
|
|
t.addEntry(pair("content-language", ""))
|
||
|
|
t.addEntry(pair("content-length", ""))
|
||
|
|
t.addEntry(pair("content-location", ""))
|
||
|
|
t.addEntry(pair("content-range", ""))
|
||
|
|
t.addEntry(pair("content-type", ""))
|
||
|
|
t.addEntry(pair("cookie", ""))
|
||
|
|
t.addEntry(pair("date", ""))
|
||
|
|
t.addEntry(pair("etag", ""))
|
||
|
|
t.addEntry(pair("expect", ""))
|
||
|
|
t.addEntry(pair("expires", ""))
|
||
|
|
t.addEntry(pair("from", ""))
|
||
|
|
t.addEntry(pair("host", ""))
|
||
|
|
t.addEntry(pair("if-match", ""))
|
||
|
|
t.addEntry(pair("if-modified-since", ""))
|
||
|
|
t.addEntry(pair("if-none-match", ""))
|
||
|
|
t.addEntry(pair("if-range", ""))
|
||
|
|
t.addEntry(pair("if-unmodified-since", ""))
|
||
|
|
t.addEntry(pair("last-modified", ""))
|
||
|
|
t.addEntry(pair("link", ""))
|
||
|
|
t.addEntry(pair("location", ""))
|
||
|
|
t.addEntry(pair("max-forwards", ""))
|
||
|
|
t.addEntry(pair("proxy-authenticate", ""))
|
||
|
|
t.addEntry(pair("proxy-authorization", ""))
|
||
|
|
t.addEntry(pair("range", ""))
|
||
|
|
t.addEntry(pair("referer", ""))
|
||
|
|
t.addEntry(pair("refresh", ""))
|
||
|
|
t.addEntry(pair("retry-after", ""))
|
||
|
|
t.addEntry(pair("server", ""))
|
||
|
|
t.addEntry(pair("set-cookie", ""))
|
||
|
|
t.addEntry(pair("strict-transport-security", ""))
|
||
|
|
t.addEntry(pair("transfer-encoding", ""))
|
||
|
|
t.addEntry(pair("user-agent", ""))
|
||
|
|
t.addEntry(pair("vary", ""))
|
||
|
|
t.addEntry(pair("via", ""))
|
||
|
|
t.addEntry(pair("www-authenticate", ""))
|
||
|
|
return t
|
||
|
|
}
|
||
|
|
|
||
|
|
var huffmanCodes = [256]uint32{
|
||
|
|
0x1ff8,
|
||
|
|
0x7fffd8,
|
||
|
|
0xfffffe2,
|
||
|
|
0xfffffe3,
|
||
|
|
0xfffffe4,
|
||
|
|
0xfffffe5,
|
||
|
|
0xfffffe6,
|
||
|
|
0xfffffe7,
|
||
|
|
0xfffffe8,
|
||
|
|
0xffffea,
|
||
|
|
0x3ffffffc,
|
||
|
|
0xfffffe9,
|
||
|
|
0xfffffea,
|
||
|
|
0x3ffffffd,
|
||
|
|
0xfffffeb,
|
||
|
|
0xfffffec,
|
||
|
|
0xfffffed,
|
||
|
|
0xfffffee,
|
||
|
|
0xfffffef,
|
||
|
|
0xffffff0,
|
||
|
|
0xffffff1,
|
||
|
|
0xffffff2,
|
||
|
|
0x3ffffffe,
|
||
|
|
0xffffff3,
|
||
|
|
0xffffff4,
|
||
|
|
0xffffff5,
|
||
|
|
0xffffff6,
|
||
|
|
0xffffff7,
|
||
|
|
0xffffff8,
|
||
|
|
0xffffff9,
|
||
|
|
0xffffffa,
|
||
|
|
0xffffffb,
|
||
|
|
0x14,
|
||
|
|
0x3f8,
|
||
|
|
0x3f9,
|
||
|
|
0xffa,
|
||
|
|
0x1ff9,
|
||
|
|
0x15,
|
||
|
|
0xf8,
|
||
|
|
0x7fa,
|
||
|
|
0x3fa,
|
||
|
|
0x3fb,
|
||
|
|
0xf9,
|
||
|
|
0x7fb,
|
||
|
|
0xfa,
|
||
|
|
0x16,
|
||
|
|
0x17,
|
||
|
|
0x18,
|
||
|
|
0x0,
|
||
|
|
0x1,
|
||
|
|
0x2,
|
||
|
|
0x19,
|
||
|
|
0x1a,
|
||
|
|
0x1b,
|
||
|
|
0x1c,
|
||
|
|
0x1d,
|
||
|
|
0x1e,
|
||
|
|
0x1f,
|
||
|
|
0x5c,
|
||
|
|
0xfb,
|
||
|
|
0x7ffc,
|
||
|
|
0x20,
|
||
|
|
0xffb,
|
||
|
|
0x3fc,
|
||
|
|
0x1ffa,
|
||
|
|
0x21,
|
||
|
|
0x5d,
|
||
|
|
0x5e,
|
||
|
|
0x5f,
|
||
|
|
0x60,
|
||
|
|
0x61,
|
||
|
|
0x62,
|
||
|
|
0x63,
|
||
|
|
0x64,
|
||
|
|
0x65,
|
||
|
|
0x66,
|
||
|
|
0x67,
|
||
|
|
0x68,
|
||
|
|
0x69,
|
||
|
|
0x6a,
|
||
|
|
0x6b,
|
||
|
|
0x6c,
|
||
|
|
0x6d,
|
||
|
|
0x6e,
|
||
|
|
0x6f,
|
||
|
|
0x70,
|
||
|
|
0x71,
|
||
|
|
0x72,
|
||
|
|
0xfc,
|
||
|
|
0x73,
|
||
|
|
0xfd,
|
||
|
|
0x1ffb,
|
||
|
|
0x7fff0,
|
||
|
|
0x1ffc,
|
||
|
|
0x3ffc,
|
||
|
|
0x22,
|
||
|
|
0x7ffd,
|
||
|
|
0x3,
|
||
|
|
0x23,
|
||
|
|
0x4,
|
||
|
|
0x24,
|
||
|
|
0x5,
|
||
|
|
0x25,
|
||
|
|
0x26,
|
||
|
|
0x27,
|
||
|
|
0x6,
|
||
|
|
0x74,
|
||
|
|
0x75,
|
||
|
|
0x28,
|
||
|
|
0x29,
|
||
|
|
0x2a,
|
||
|
|
0x7,
|
||
|
|
0x2b,
|
||
|
|
0x76,
|
||
|
|
0x2c,
|
||
|
|
0x8,
|
||
|
|
0x9,
|
||
|
|
0x2d,
|
||
|
|
0x77,
|
||
|
|
0x78,
|
||
|
|
0x79,
|
||
|
|
0x7a,
|
||
|
|
0x7b,
|
||
|
|
0x7ffe,
|
||
|
|
0x7fc,
|
||
|
|
0x3ffd,
|
||
|
|
0x1ffd,
|
||
|
|
0xffffffc,
|
||
|
|
0xfffe6,
|
||
|
|
0x3fffd2,
|
||
|
|
0xfffe7,
|
||
|
|
0xfffe8,
|
||
|
|
0x3fffd3,
|
||
|
|
0x3fffd4,
|
||
|
|
0x3fffd5,
|
||
|
|
0x7fffd9,
|
||
|
|
0x3fffd6,
|
||
|
|
0x7fffda,
|
||
|
|
0x7fffdb,
|
||
|
|
0x7fffdc,
|
||
|
|
0x7fffdd,
|
||
|
|
0x7fffde,
|
||
|
|
0xffffeb,
|
||
|
|
0x7fffdf,
|
||
|
|
0xffffec,
|
||
|
|
0xffffed,
|
||
|
|
0x3fffd7,
|
||
|
|
0x7fffe0,
|
||
|
|
0xffffee,
|
||
|
|
0x7fffe1,
|
||
|
|
0x7fffe2,
|
||
|
|
0x7fffe3,
|
||
|
|
0x7fffe4,
|
||
|
|
0x1fffdc,
|
||
|
|
0x3fffd8,
|
||
|
|
0x7fffe5,
|
||
|
|
0x3fffd9,
|
||
|
|
0x7fffe6,
|
||
|
|
0x7fffe7,
|
||
|
|
0xffffef,
|
||
|
|
0x3fffda,
|
||
|
|
0x1fffdd,
|
||
|
|
0xfffe9,
|
||
|
|
0x3fffdb,
|
||
|
|
0x3fffdc,
|
||
|
|
0x7fffe8,
|
||
|
|
0x7fffe9,
|
||
|
|
0x1fffde,
|
||
|
|
0x7fffea,
|
||
|
|
0x3fffdd,
|
||
|
|
0x3fffde,
|
||
|
|
0xfffff0,
|
||
|
|
0x1fffdf,
|
||
|
|
0x3fffdf,
|
||
|
|
0x7fffeb,
|
||
|
|
0x7fffec,
|
||
|
|
0x1fffe0,
|
||
|
|
0x1fffe1,
|
||
|
|
0x3fffe0,
|
||
|
|
0x1fffe2,
|
||
|
|
0x7fffed,
|
||
|
|
0x3fffe1,
|
||
|
|
0x7fffee,
|
||
|
|
0x7fffef,
|
||
|
|
0xfffea,
|
||
|
|
0x3fffe2,
|
||
|
|
0x3fffe3,
|
||
|
|
0x3fffe4,
|
||
|
|
0x7ffff0,
|
||
|
|
0x3fffe5,
|
||
|
|
0x3fffe6,
|
||
|
|
0x7ffff1,
|
||
|
|
0x3ffffe0,
|
||
|
|
0x3ffffe1,
|
||
|
|
0xfffeb,
|
||
|
|
0x7fff1,
|
||
|
|
0x3fffe7,
|
||
|
|
0x7ffff2,
|
||
|
|
0x3fffe8,
|
||
|
|
0x1ffffec,
|
||
|
|
0x3ffffe2,
|
||
|
|
0x3ffffe3,
|
||
|
|
0x3ffffe4,
|
||
|
|
0x7ffffde,
|
||
|
|
0x7ffffdf,
|
||
|
|
0x3ffffe5,
|
||
|
|
0xfffff1,
|
||
|
|
0x1ffffed,
|
||
|
|
0x7fff2,
|
||
|
|
0x1fffe3,
|
||
|
|
0x3ffffe6,
|
||
|
|
0x7ffffe0,
|
||
|
|
0x7ffffe1,
|
||
|
|
0x3ffffe7,
|
||
|
|
0x7ffffe2,
|
||
|
|
0xfffff2,
|
||
|
|
0x1fffe4,
|
||
|
|
0x1fffe5,
|
||
|
|
0x3ffffe8,
|
||
|
|
0x3ffffe9,
|
||
|
|
0xffffffd,
|
||
|
|
0x7ffffe3,
|
||
|
|
0x7ffffe4,
|
||
|
|
0x7ffffe5,
|
||
|
|
0xfffec,
|
||
|
|
0xfffff3,
|
||
|
|
0xfffed,
|
||
|
|
0x1fffe6,
|
||
|
|
0x3fffe9,
|
||
|
|
0x1fffe7,
|
||
|
|
0x1fffe8,
|
||
|
|
0x7ffff3,
|
||
|
|
0x3fffea,
|
||
|
|
0x3fffeb,
|
||
|
|
0x1ffffee,
|
||
|
|
0x1ffffef,
|
||
|
|
0xfffff4,
|
||
|
|
0xfffff5,
|
||
|
|
0x3ffffea,
|
||
|
|
0x7ffff4,
|
||
|
|
0x3ffffeb,
|
||
|
|
0x7ffffe6,
|
||
|
|
0x3ffffec,
|
||
|
|
0x3ffffed,
|
||
|
|
0x7ffffe7,
|
||
|
|
0x7ffffe8,
|
||
|
|
0x7ffffe9,
|
||
|
|
0x7ffffea,
|
||
|
|
0x7ffffeb,
|
||
|
|
0xffffffe,
|
||
|
|
0x7ffffec,
|
||
|
|
0x7ffffed,
|
||
|
|
0x7ffffee,
|
||
|
|
0x7ffffef,
|
||
|
|
0x7fffff0,
|
||
|
|
0x3ffffee,
|
||
|
|
}
|
||
|
|
|
||
|
|
var huffmanCodeLen = [256]uint8{
|
||
|
|
13, 23, 28, 28, 28, 28, 28, 28, 28, 24, 30, 28, 28, 30, 28, 28,
|
||
|
|
28, 28, 28, 28, 28, 28, 30, 28, 28, 28, 28, 28, 28, 28, 28, 28,
|
||
|
|
6, 10, 10, 12, 13, 6, 8, 11, 10, 10, 8, 11, 8, 6, 6, 6,
|
||
|
|
5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7, 8, 15, 6, 12, 10,
|
||
|
|
13, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
||
|
|
7, 7, 7, 7, 7, 7, 7, 7, 8, 7, 8, 13, 19, 13, 14, 6,
|
||
|
|
15, 5, 6, 5, 6, 5, 6, 6, 6, 5, 7, 7, 6, 6, 6, 5,
|
||
|
|
6, 7, 6, 5, 5, 6, 7, 7, 7, 7, 7, 15, 11, 14, 13, 28,
|
||
|
|
20, 22, 20, 20, 22, 22, 22, 23, 22, 23, 23, 23, 23, 23, 24, 23,
|
||
|
|
24, 24, 22, 23, 24, 23, 23, 23, 23, 21, 22, 23, 22, 23, 23, 24,
|
||
|
|
22, 21, 20, 22, 22, 23, 23, 21, 23, 22, 22, 24, 21, 22, 23, 23,
|
||
|
|
21, 21, 22, 21, 23, 22, 23, 23, 20, 22, 22, 22, 23, 22, 22, 23,
|
||
|
|
26, 26, 20, 19, 22, 23, 22, 25, 26, 26, 26, 27, 27, 26, 24, 25,
|
||
|
|
19, 21, 26, 27, 27, 26, 27, 24, 21, 21, 26, 26, 28, 27, 27, 27,
|
||
|
|
20, 24, 20, 21, 22, 21, 21, 23, 22, 22, 25, 25, 24, 24, 26, 23,
|
||
|
|
26, 27, 26, 26, 27, 27, 27, 27, 27, 28, 27, 27, 27, 27, 27, 26,
|
||
|
|
}
|