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import
{
prettyByte
}
from
"./utils/prettyByte.ts"
;
import
{
ExtensionCodec
}
from
"./ExtensionCodec.ts"
;
import
{
getInt64
,
getUint64
,
UINT32_MAX
}
from
"./utils/int.ts"
;
import
{
utf8Decode
}
from
"./utils/utf8.ts"
;
import
{
ensureUint8Array
}
from
"./utils/typedArrays.ts"
;
import
{
CachedKeyDecoder
}
from
"./CachedKeyDecoder.ts"
;
import
{
DecodeError
}
from
"./DecodeError.ts"
;
import
type
{
ContextOf
}
from
"./context.ts"
;
import
type
{
ExtensionCodecType
}
from
"./ExtensionCodec.ts"
;
import
type
{
KeyDecoder
}
from
"./CachedKeyDecoder.ts"
;
export
type
DecoderOptions
<
ContextType
=
undefined
>
=
Readonly
<
Partial
<
{
extensionCodec
:
ExtensionCodecType
<
ContextType
>
;
/**
* Decodes Int64 and Uint64 as bigint if it's set to true.
* Depends on ES2020's {
@link
DataView#getBigInt64} and
* {
@link
DataView#getBigUint64}.
*
* Defaults to false.
*/
useBigInt64
:
boolean
;
/**
* By default, string values will be decoded as UTF-8 strings. However, if this option is true,
* string values will be returned as Uint8Arrays without additional decoding.
*
* This is useful if the strings may contain invalid UTF-8 sequences.
*
* Note that this option only applies to string values, not map keys. Additionally, when
* enabled, raw string length is limited by the maxBinLength option.
*/
rawStrings
:
boolean
;
/**
* Maximum string length.
*
* Defaults to 4_294_967_295 (UINT32_MAX).
*/
maxStrLength
:
number
;
/**
* Maximum binary length.
*
* Defaults to 4_294_967_295 (UINT32_MAX).
*/
maxBinLength
:
number
;
/**
* Maximum array length.
*
* Defaults to 4_294_967_295 (UINT32_MAX).
*/
maxArrayLength
:
number
;
/**
* Maximum map length.
*
* Defaults to 4_294_967_295 (UINT32_MAX).
*/
maxMapLength
:
number
;
/**
* Maximum extension length.
*
* Defaults to 4_294_967_295 (UINT32_MAX).
*/
maxExtLength
:
number
;
/**
* An object key decoder. Defaults to the shared instance of {
@link
CachedKeyDecoder}.
* `null` is a special value to disable the use of the key decoder at all.
*/
keyDecoder
:
KeyDecoder
|
null
;
/**
* A function to convert decoded map key to a valid JS key type.
*
* Defaults to a function that throws an error if the key is not a string or a number.
*/
mapKeyConverter
:
(
key
:
unknown
)
=>
MapKeyType
;
}
>
>
&
ContextOf
<
ContextType
>
;
const
STATE_ARRAY
=
"array"
;
const
STATE_MAP_KEY
=
"map_key"
;
const
STATE_MAP_VALUE
=
"map_value"
;
type
MapKeyType
=
string
|
number
;
const
mapKeyConverter
=
(
key
:
unknown
)
:
MapKeyType
=>
{
if
(
typeof
key
===
"string"
||
typeof
key
===
"number"
)
{
return
key
;
}
throw
new
DecodeError
(
"The type of key must be string or number but "
+
typeof
key
)
;
}
;
type
StackMapState
=
{
type
:
typeof
STATE_MAP_KEY
|
typeof
STATE_MAP_VALUE
;
size
:
number
;
key
:
MapKeyType
|
null
;
readCount
:
number
;
map
:
Record
<
string
,
unknown
>
;
}
;
type
StackArrayState
=
{
type
:
typeof
STATE_ARRAY
;
size
:
number
;
array
:
Array
<
unknown
>
;
position
:
number
;
}
;
class
StackPool
{
private
readonly
stack
:
Array
<
StackState
>
=
[
]
;
private
stackHeadPosition
=
-
1
;
public
get
length
(
)
:
number
{
return
this
.
stackHeadPosition
+
1
;
}
public
top
(
)
:
StackState
|
undefined
{
return
this
.
stack
[
this
.
stackHeadPosition
]
;
}
public
pushArrayState
(
size
:
number
)
{
const
state
=
this
.
getUninitializedStateFromPool
(
)
as
StackArrayState
;
state
.
type
=
STATE_ARRAY
;
state
.
position
=
0
;
state
.
size
=
size
;
state
.
array
=
new
Array
(
size
)
;
}
public
pushMapState
(
size
:
number
)
{
const
state
=
this
.
getUninitializedStateFromPool
(
)
as
StackMapState
;
state
.
type
=
STATE_MAP_KEY
;
state
.
readCount
=
0
;
state
.
size
=
size
;
state
.
map
=
{
}
;
}
private
getUninitializedStateFromPool
(
)
{
this
.
stackHeadPosition
++
;
if
(
this
.
stackHeadPosition
===
this
.
stack
.
length
)
{
const
partialState
:
Partial
<
StackState
>
=
{
type
:
undefined
,
size
:
0
,
array
:
undefined
,
position
:
0
,
readCount
:
0
,
map
:
undefined
,
key
:
null
,
}
;
this
.
stack
.
push
(
partialState
as
StackState
)
;
}
return
this
.
stack
[
this
.
stackHeadPosition
]
;
}
public
release
(
state
:
StackState
)
:
void
{
const
topStackState
=
this
.
stack
[
this
.
stackHeadPosition
]
;
if
(
topStackState
!==
state
)
{
throw
new
Error
(
"Invalid stack state. Released state is not on top of the stack."
)
;
}
if
(
state
.
type
===
STATE_ARRAY
)
{
const
partialState
=
state
as
Partial
<
StackArrayState
>
;
partialState
.
size
=
0
;
partialState
.
array
=
undefined
;
partialState
.
position
=
0
;
partialState
.
type
=
undefined
;
}
if
(
state
.
type
===
STATE_MAP_KEY
||
state
.
type
===
STATE_MAP_VALUE
)
{
const
partialState
=
state
as
Partial
<
StackMapState
>
;
partialState
.
size
=
0
;
partialState
.
map
=
undefined
;
partialState
.
readCount
=
0
;
partialState
.
type
=
undefined
;
}
this
.
stackHeadPosition
--
;
}
public
reset
(
)
:
void
{
this
.
stack
.
length
=
0
;
this
.
stackHeadPosition
=
-
1
;
}
}
type
StackState
=
StackArrayState
|
StackMapState
;
const
HEAD_BYTE_REQUIRED
=
-
1
;
const
EMPTY_VIEW
=
new
DataView
<
ArrayBufferLike
>
(
new
ArrayBuffer
(
0
)
)
;
const
EMPTY_BYTES
=
new
Uint8Array
<
ArrayBufferLike
>
(
EMPTY_VIEW
.
buffer
)
;
try
{
// IE11: The spec says it should throw RangeError,
// IE11: but in IE11 it throws TypeError.
EMPTY_VIEW
.
getInt8
(
0
)
;
}
catch
(
e
)
{
if
(
!
(
e
instanceof
RangeError
)
)
{
throw
new
Error
(
"This module is not supported in the current JavaScript engine because DataView does not throw RangeError on out-of-bounds access"
,
)
;
}
}
const
MORE_DATA
=
new
RangeError
(
"Insufficient data"
)
;
const
sharedCachedKeyDecoder
=
new
CachedKeyDecoder
(
)
;
export
class
Decoder
<
ContextType
=
undefined
>
{
private
readonly
extensionCodec
:
ExtensionCodecType
<
ContextType
>
;
private
readonly
context
:
ContextType
;
private
readonly
useBigInt64
:
boolean
;
private
readonly
rawStrings
:
boolean
;
private
readonly
maxStrLength
:
number
;
private
readonly
maxBinLength
:
number
;
private
readonly
maxArrayLength
:
number
;
private
readonly
maxMapLength
:
number
;
private
readonly
maxExtLength
:
number
;
private
readonly
keyDecoder
:
KeyDecoder
|
null
;
private
readonly
mapKeyConverter
:
(
key
:
unknown
)
=>
MapKeyType
;
private
totalPos
=
0
;
private
pos
=
0
;
private
view
=
EMPTY_VIEW
;
private
bytes
=
EMPTY_BYTES
;
private
headByte
=
HEAD_BYTE_REQUIRED
;
private
readonly
stack
=
new
StackPool
(
)
;
private
entered
=
false
;
public
constructor
(
options
?:
DecoderOptions
<
ContextType
>
)
{
this
.
extensionCodec
=
options
?.
extensionCodec
??
(
ExtensionCodec
.
defaultCodec
as
ExtensionCodecType
<
ContextType
>
)
;
this
.
context
=
(
options
as
{
context
:
ContextType
}
|
undefined
)
?.
context
as
ContextType
;
// needs a type assertion because EncoderOptions has no context property when ContextType is undefined
this
.
useBigInt64
=
options
?.
useBigInt64
??
false
;
this
.
rawStrings
=
options
?.
rawStrings
??
false
;
this
.
maxStrLength
=
options
?.
maxStrLength
??
UINT32_MAX
;
this
.
maxBinLength
=
options
?.
maxBinLength
??
UINT32_MAX
;
this
.
maxArrayLength
=
options
?.
maxArrayLength
??
UINT32_MAX
;
this
.
maxMapLength
=
options
?.
maxMapLength
??
UINT32_MAX
;
this
.
maxExtLength
=
options
?.
maxExtLength
??
UINT32_MAX
;
this
.
keyDecoder
=
options
?.
keyDecoder
!==
undefined
?
options
.
keyDecoder
:
sharedCachedKeyDecoder
;
this
.
mapKeyConverter
=
options
?.
mapKeyConverter
??
mapKeyConverter
;
}
private
clone
(
)
:
Decoder
<
ContextType
>
{
// eslint-disable-next-line @typescript-eslint/no-unsafe-argument
return
new
Decoder
(
{
extensionCodec
:
this
.
extensionCodec
,
context
:
this
.
context
,
useBigInt64
:
this
.
useBigInt64
,
rawStrings
:
this
.
rawStrings
,
maxStrLength
:
this
.
maxStrLength
,
maxBinLength
:
this
.
maxBinLength
,
maxArrayLength
:
this
.
maxArrayLength
,
maxMapLength
:
this
.
maxMapLength
,
maxExtLength
:
this
.
maxExtLength
,
keyDecoder
:
this
.
keyDecoder
,
}
as
any
)
;
}
private
reinitializeState
(
)
{
this
.
totalPos
=
0
;
this
.
headByte
=
HEAD_BYTE_REQUIRED
;
this
.
stack
.
reset
(
)
;
// view, bytes, and pos will be re-initialized in setBuffer()
}
private
setBuffer
(
buffer
:
ArrayLike
<
number
>
|
ArrayBufferView
|
ArrayBufferLike
)
:
void
{
const
bytes
=
ensureUint8Array
(
buffer
)
;
this
.
bytes
=
bytes
;
this
.
view
=
new
DataView
(
bytes
.
buffer
,
bytes
.
byteOffset
,
bytes
.
byteLength
)
;
this
.
pos
=
0
;
}
private
appendBuffer
(
buffer
:
ArrayLike
<
number
>
|
ArrayBufferView
|
ArrayBufferLike
)
:
void
{
if
(
this
.
headByte
===
HEAD_BYTE_REQUIRED
&&
!
this
.
hasRemaining
(
1
)
)
{
this
.
setBuffer
(
buffer
)
;
}
else
{
const
remainingData
=
this
.
bytes
.
subarray
(
this
.
pos
)
;
const
newData
=
ensureUint8Array
(
buffer
)
;
// concat remainingData + newData
const
newBuffer
=
new
Uint8Array
(
remainingData
.
length
+
newData
.
length
)
;
newBuffer
.
set
(
remainingData
)
;
newBuffer
.
set
(
newData
,
remainingData
.
length
)
;
this
.
setBuffer
(
newBuffer
)
;
}
}
private
hasRemaining
(
size
:
number
)
{
return
this
.
view
.
byteLength
-
this
.
pos
>=
size
;
}
private
createExtraByteError
(
posToShow
:
number
)
:
Error
{
const
{
view
,
pos
}
=
this
;
return
new
RangeError
(
`Extra
${
view
.
byteLength
-
pos
}
of
${
view
.
byteLength
}
byte(s) found at buffer[
${
posToShow
}
]`
)
;
}
/**
*
@throws
{
@link DecodeError
}
*
@throws
{
@link RangeError
}
*/
public
decode
(
buffer
:
ArrayLike
<
number
>
|
ArrayBufferView
|
ArrayBufferLike
)
:
unknown
{
if
(
this
.
entered
)
{
const
instance
=
this
.
clone
(
)
;
return
instance
.
decode
(
buffer
)
;
}
try
{
this
.
entered
=
true
;
this
.
reinitializeState
(
)
;
this
.
setBuffer
(
buffer
)
;
const
object
=
this
.
doDecodeSync
(
)
;
if
(
this
.
hasRemaining
(
1
)
)
{
throw
this
.
createExtraByteError
(
this
.
pos
)
;
}
return
object
;
}
finally
{
this
.
entered
=
false
;
}
}
public
*
decodeMulti
(
buffer
:
ArrayLike
<
number
>
|
ArrayBufferView
|
ArrayBufferLike
)
:
Generator
<
unknown
,
void
,
unknown
>
{
if
(
this
.
entered
)
{
const
instance
=
this
.
clone
(
)
;
yield
*
instance
.
decodeMulti
(
buffer
)
;
return
;
}
try
{
this
.
entered
=
true
;
this
.
reinitializeState
(
)
;
this
.
setBuffer
(
buffer
)
;
while
(
this
.
hasRemaining
(
1
)
)
{
yield
this
.
doDecodeSync
(
)
;
}
}
finally
{
this
.
entered
=
false
;
}
}
public
async
decodeAsync
(
stream
:
AsyncIterable
<
ArrayLike
<
number
>
|
ArrayBufferView
|
ArrayBufferLike
>
)
:
Promise
<
unknown
>
{
if
(
this
.
entered
)
{
const
instance
=
this
.
clone
(
)
;
return
instance
.
decodeAsync
(
stream
)
;
}
try
{
this
.
entered
=
true
;
let
decoded
=
false
;
let
object
:
unknown
;
for
await
(
const
buffer
of
stream
)
{
if
(
decoded
)
{
this
.
entered
=
false
;
throw
this
.
createExtraByteError
(
this
.
totalPos
)
;
}
this
.
appendBuffer
(
buffer
)
;
try
{
object
=
this
.
doDecodeSync
(
)
;
decoded
=
true
;
}
catch
(
e
)
{
if
(
!
(
e
instanceof
RangeError
)
)
{
throw
e
;
// rethrow
}
// fallthrough
}
this
.
totalPos
+=
this
.
pos
;
}
if
(
decoded
)
{
if
(
this
.
hasRemaining
(
1
)
)
{
throw
this
.
createExtraByteError
(
this
.
totalPos
)
;
}
return
object
;
}
const
{
headByte
,
pos
,
totalPos
}
=
this
;
throw
new
RangeError
(
`Insufficient data in parsing
${
prettyByte
(
headByte
)
}
at
${
totalPos
}
(
${
pos
}
in the current buffer)`
,
)
;
}
finally
{
this
.
entered
=
false
;
}
}
public
decodeArrayStream
(
stream
:
AsyncIterable
<
ArrayLike
<
number
>
|
ArrayBufferView
|
ArrayBufferLike
>
,
)
:
AsyncGenerator
<
unknown
,
void
,
unknown
>
{
return
this
.
decodeMultiAsync
(
stream
,
true
)
;
}
public
decodeStream
(
stream
:
AsyncIterable
<
ArrayLike
<
number
>
|
ArrayBufferView
|
ArrayBufferLike
>
)
:
AsyncGenerator
<
unknown
,
void
,
unknown
>
{
return
this
.
decodeMultiAsync
(
stream
,
false
)
;
}
private
async
*
decodeMultiAsync
(
stream
:
AsyncIterable
<
ArrayLike
<
number
>
|
ArrayBufferView
|
ArrayBufferLike
>
,
isArray
:
boolean
)
:
AsyncGenerator
<
unknown
,
void
,
unknown
>
{
if
(
this
.
entered
)
{
const
instance
=
this
.
clone
(
)
;
yield
*
instance
.
decodeMultiAsync
(
stream
,
isArray
)
;
return
;
}
try
{
this
.
entered
=
true
;
let
isArrayHeaderRequired
=
isArray
;
let
arrayItemsLeft
=
-
1
;
for
await
(
const
buffer
of
stream
)
{
if
(
isArray
&&
arrayItemsLeft
===
0
)
{
throw
this
.
createExtraByteError
(
this
.
totalPos
)
;
}
this
.
appendBuffer
(
buffer
)
;
if
(
isArrayHeaderRequired
)
{
arrayItemsLeft
=
this
.
readArraySize
(
)
;
isArrayHeaderRequired
=
false
;
this
.
complete
(
)
;
}
try
{
while
(
true
)
{
yield
this
.
doDecodeSync
(
)
;
if
(
--
arrayItemsLeft
===
0
)
{
break
;
}
}
}
catch
(
e
)
{
if
(
!
(
e
instanceof
RangeError
)
)
{
throw
e
;
// rethrow
}
// fallthrough
}
this
.
totalPos
+=
this
.
pos
;
}
}
finally
{
this
.
entered
=
false
;
}
}
private
doDecodeSync
(
)
:
unknown
{
DECODE:
while
(
true
)
{
const
headByte
=
this
.
readHeadByte
(
)
;
let
object
:
unknown
;
if
(
headByte
>=
0xe0
)
{
// negative fixint (111x xxxx) 0xe0 - 0xff
object
=
headByte
-
0x100
;
}
else
if
(
headByte
<
0xc0
)
{
if
(
headByte
<
0x80
)
{
// positive fixint (0xxx xxxx) 0x00 - 0x7f
object
=
headByte
;
}
else
if
(
headByte
<
0x90
)
{
// fixmap (1000 xxxx) 0x80 - 0x8f
const
size
=
headByte
-
0x80
;
if
(
size
!==
0
)
{
this
.
pushMapState
(
size
)
;
this
.
complete
(
)
;
continue
DECODE
;
}
else
{
object
=
{
}
;
}
}
else
if
(
headByte
<
0xa0
)
{
// fixarray (1001 xxxx) 0x90 - 0x9f
const
size
=
headByte
-
0x90
;
if
(
size
!==
0
)
{
this
.
pushArrayState
(
size
)
;
this
.
complete
(
)
;
continue
DECODE
;
}
else
{
object
=
[
]
;
}
}
else
{
// fixstr (101x xxxx) 0xa0 - 0xbf
const
byteLength
=
headByte
-
0xa0
;
object
=
this
.
decodeString
(
byteLength
,
0
)
;
}
}
else
if
(
headByte
===
0xc0
)
{
// nil
object
=
null
;
}
else
if
(
headByte
===
0xc2
)
{
// false
object
=
false
;
}
else
if
(
headByte
===
0xc3
)
{
// true
object
=
true
;
}
else
if
(
headByte
===
0xca
)
{
// float 32
object
=
this
.
readF32
(
)
;
}
else
if
(
headByte
===
0xcb
)
{
// float 64
object
=
this
.
readF64
(
)
;
}
else
if
(
headByte
===
0xcc
)
{
// uint 8
object
=
this
.
readU8
(
)
;
}
else
if
(
headByte
===
0xcd
)
{
// uint 16
object
=
this
.
readU16
(
)
;
}
else
if
(
headByte
===
0xce
)
{
// uint 32
object
=
this
.
readU32
(
)
;
}
else
if
(
headByte
===
0xcf
)
{
// uint 64
if
(
this
.
useBigInt64
)
{
object
=
this
.
readU64AsBigInt
(
)
;
}
else
{
object
=
this
.
readU64
(
)
;
}
}
else
if
(
headByte
===
0xd0
)
{
// int 8
object
=
this
.
readI8
(
)
;
}
else
if
(
headByte
===
0xd1
)
{
// int 16
object
=
this
.
readI16
(
)
;
}
else
if
(
headByte
===
0xd2
)
{
// int 32
object
=
this
.
readI32
(
)
;
}
else
if
(
headByte
===
0xd3
)
{
// int 64
if
(
this
.
useBigInt64
)
{
object
=
this
.
readI64AsBigInt
(
)
;
}
else
{
object
=
this
.
readI64
(
)
;
}
}
else
if
(
headByte
===
0xd9
)
{
// str 8
const
byteLength
=
this
.
lookU8
(
)
;
object
=
this
.
decodeString
(
byteLength
,
1
)
;
}
else
if
(
headByte
===
0xda
)
{
// str 16
const
byteLength
=
this
.
lookU16
(
)
;
object
=
this
.
decodeString
(
byteLength
,
2
)
;
}
else
if
(
headByte
===
0xdb
)
{
// str 32
const
byteLength
=
this
.
lookU32
(
)
;
object
=
this
.
decodeString
(
byteLength
,
4
)
;
}
else
if
(
headByte
===
0xdc
)
{
// array 16
const
size
=
this
.
readU16
(
)
;
if
(
size
!==
0
)
{
this
.
pushArrayState
(
size
)
;
this
.
complete
(
)
;
continue
DECODE
;
}
else
{
object
=
[
]
;
}
}
else
if
(
headByte
===
0xdd
)
{
// array 32
const
size
=
this
.
readU32
(
)
;
if
(
size
!==
0
)
{
this
.
pushArrayState
(
size
)
;
this
.
complete
(
)
;
continue
DECODE
;
}
else
{
object
=
[
]
;
}
}
else
if
(
headByte
===
0xde
)
{
// map 16
const
size
=
this
.
readU16
(
)
;
if
(
size
!==
0
)
{
this
.
pushMapState
(
size
)
;
this
.
complete
(
)
;
continue
DECODE
;
}
else
{
object
=
{
}
;
}
}
else
if
(
headByte
===
0xdf
)
{
// map 32
const
size
=
this
.
readU32
(
)
;
if
(
size
!==
0
)
{
this
.
pushMapState
(
size
)
;
this
.
complete
(
)
;
continue
DECODE
;
}
else
{
object
=
{
}
;
}
}
else
if
(
headByte
===
0xc4
)
{
// bin 8
const
size
=
this
.
lookU8
(
)
;
object
=
this
.
decodeBinary
(
size
,
1
)
;
}
else
if
(
headByte
===
0xc5
)
{
// bin 16
const
size
=
this
.
lookU16
(
)
;
object
=
this
.
decodeBinary
(
size
,
2
)
;
}
else
if
(
headByte
===
0xc6
)
{
// bin 32
const
size
=
this
.
lookU32
(
)
;
object
=
this
.
decodeBinary
(
size
,
4
)
;
}
else
if
(
headByte
===
0xd4
)
{
// fixext 1
object
=
this
.
decodeExtension
(
1
,
0
)
;
}
else
if
(
headByte
===
0xd5
)
{
// fixext 2
object
=
this
.
decodeExtension
(
2
,
0
)
;
}
else
if
(
headByte
===
0xd6
)
{
// fixext 4
object
=
this
.
decodeExtension
(
4
,
0
)
;
}
else
if
(
headByte
===
0xd7
)
{
// fixext 8
object
=
this
.
decodeExtension
(
8
,
0
)
;
}
else
if
(
headByte
===
0xd8
)
{
// fixext 16
object
=
this
.
decodeExtension
(
16
,
0
)
;
}
else
if
(
headByte
===
0xc7
)
{
// ext 8
const
size
=
this
.
lookU8
(
)
;
object
=
this
.
decodeExtension
(
size
,
1
)
;
}
else
if
(
headByte
===
0xc8
)
{
// ext 16
const
size
=
this
.
lookU16
(
)
;
object
=
this
.
decodeExtension
(
size
,
2
)
;
}
else
if
(
headByte
===
0xc9
)
{
// ext 32
const
size
=
this
.
lookU32
(
)
;
object
=
this
.
decodeExtension
(
size
,
4
)
;
}
else
{
throw
new
DecodeError
(
`Unrecognized type byte:
${
prettyByte
(
headByte
)
}
`
)
;
}
this
.
complete
(
)
;
const
stack
=
this
.
stack
;
while
(
stack
.
length
>
0
)
{
// arrays and maps
const
state
=
stack
.
top
(
)
!
;
if
(
state
.
type
===
STATE_ARRAY
)
{
state
.
array
[
state
.
position
]
=
object
;
state
.
position
++
;
if
(
state
.
position
===
state
.
size
)
{
object
=
state
.
array
;
stack
.
release
(
state
)
;
}
else
{
continue
DECODE
;
}
}
else
if
(
state
.
type
===
STATE_MAP_KEY
)
{
if
(
object
===
"__proto__"
||
object
===
"constructor"
||
object
===
"prototype"
)
{
throw
new
DecodeError
(
`The key
${
object
}
is not allowed`
)
;
}
state
.
key
=
this
.
mapKeyConverter
(
object
)
;
state
.
type
=
STATE_MAP_VALUE
;
continue
DECODE
;
}
else
{
// it must be `state.type === State.MAP_VALUE` here
state
.
map
[
state
.
key
!
]
=
object
;
state
.
readCount
++
;
if
(
state
.
readCount
===
state
.
size
)
{
object
=
state
.
map
;
stack
.
release
(
state
)
;
}
else
{
state
.
key
=
null
;
state
.
type
=
STATE_MAP_KEY
;
continue
DECODE
;
}
}
}
return
object
;
}
}
private
readHeadByte
(
)
:
number
{
if
(
this
.
headByte
===
HEAD_BYTE_REQUIRED
)
{
this
.
headByte
=
this
.
readU8
(
)
;
// console.log("headByte", prettyByte(this.headByte));
}
return
this
.
headByte
;
}
private
complete
(
)
:
void
{
this
.
headByte
=
HEAD_BYTE_REQUIRED
;
}
private
readArraySize
(
)
:
number
{
const
headByte
=
this
.
readHeadByte
(
)
;
switch
(
headByte
)
{
case
0xdc
:
return
this
.
readU16
(
)
;
case
0xdd
:
return
this
.
readU32
(
)
;
default
:
{
if
(
headByte
<
0xa0
)
{
return
headByte
-
0x90
;
}
else
{
throw
new
DecodeError
(
`Unrecognized array type byte:
${
prettyByte
(
headByte
)
}
`
)
;
}
}
}
}
private
pushMapState
(
size
:
number
)
{
if
(
size
>
this
.
maxMapLength
)
{
throw
new
DecodeError
(
`Max length exceeded: map length (
${
size
}
) > maxMapLengthLength (
${
this
.
maxMapLength
}
)`
)
;
}
this
.
stack
.
pushMapState
(
size
)
;
}
private
pushArrayState
(
size
:
number
)
{
if
(
size
>
this
.
maxArrayLength
)
{
throw
new
DecodeError
(
`Max length exceeded: array length (
${
size
}
) > maxArrayLength (
${
this
.
maxArrayLength
}
)`
)
;
}
this
.
stack
.
pushArrayState
(
size
)
;
}
private
decodeString
(
byteLength
:
number
,
headerOffset
:
number
)
:
string
|
Uint8Array
{
if
(
!
this
.
rawStrings
||
this
.
stateIsMapKey
(
)
)
{
return
this
.
decodeUtf8String
(
byteLength
,
headerOffset
)
;
}
return
this
.
decodeBinary
(
byteLength
,
headerOffset
)
;
}
/**
*
@throws
{
@link RangeError
}
*/
private
decodeUtf8String
(
byteLength
:
number
,
headerOffset
:
number
)
:
string
{
if
(
byteLength
>
this
.
maxStrLength
)
{
throw
new
DecodeError
(
`Max length exceeded: UTF-8 byte length (
${
byteLength
}
) > maxStrLength (
${
this
.
maxStrLength
}
)`
,
)
;
}
if
(
this
.
bytes
.
byteLength
<
this
.
pos
+
headerOffset
+
byteLength
)
{
throw
MORE_DATA
;
}
const
offset
=
this
.
pos
+
headerOffset
;
let
object
:
string
;
if
(
this
.
stateIsMapKey
(
)
&&
this
.
keyDecoder
?.
canBeCached
(
byteLength
)
)
{
object
=
this
.
keyDecoder
.
decode
(
this
.
bytes
,
offset
,
byteLength
)
;
}
else
{
object
=
utf8Decode
(
this
.
bytes
,
offset
,
byteLength
)
;
}
this
.
pos
+=
headerOffset
+
byteLength
;
return
object
;
}
private
stateIsMapKey
(
)
:
boolean
{
if
(
this
.
stack
.
length
>
0
)
{
const
state
=
this
.
stack
.
top
(
)
!
;
return
state
.
type
===
STATE_MAP_KEY
;
}
return
false
;
}
/**
*
@throws
{
@link RangeError
}
*/
private
decodeBinary
(
byteLength
:
number
,
headOffset
:
number
)
:
Uint8Array
{
if
(
byteLength
>
this
.
maxBinLength
)
{
throw
new
DecodeError
(
`Max length exceeded: bin length (
${
byteLength
}
) > maxBinLength (
${
this
.
maxBinLength
}
)`
)
;
}
if
(
!
this
.
hasRemaining
(
byteLength
+
headOffset
)
)
{
throw
MORE_DATA
;
}
const
offset
=
this
.
pos
+
headOffset
;
const
object
=
this
.
bytes
.
subarray
(
offset
,
offset
+
byteLength
)
;
this
.
pos
+=
headOffset
+
byteLength
;
return
object
;
}
private
decodeExtension
(
size
:
number
,
headOffset
:
number
)
:
unknown
{
if
(
size
>
this
.
maxExtLength
)
{
throw
new
DecodeError
(
`Max length exceeded: ext length (
${
size
}
) > maxExtLength (
${
this
.
maxExtLength
}
)`
)
;
}
const
extType
=
this
.
view
.
getInt8
(
this
.
pos
+
headOffset
)
;
const
data
=
this
.
decodeBinary
(
size
,
headOffset
+
1
/* extType */
)
;
return
this
.
extensionCodec
.
decode
(
data
,
extType
,
this
.
context
)
;
}
private
lookU8
(
)
{
return
this
.
view
.
getUint8
(
this
.
pos
)
;
}
private
lookU16
(
)
{
return
this
.
view
.
getUint16
(
this
.
pos
)
;
}
private
lookU32
(
)
{
return
this
.
view
.
getUint32
(
this
.
pos
)
;
}
private
readU8
(
)
:
number
{
const
value
=
this
.
view
.
getUint8
(
this
.
pos
)
;
this
.
pos
++
;
return
value
;
}
private
readI8
(
)
:
number
{
const
value
=
this
.
view
.
getInt8
(
this
.
pos
)
;
this
.
pos
++
;
return
value
;
}
private
readU16
(
)
:
number
{
const
value
=
this
.
view
.
getUint16
(
this
.
pos
)
;
this
.
pos
+=
2
;
return
value
;
}
private
readI16
(
)
:
number
{
const
value
=
this
.
view
.
getInt16
(
this
.
pos
)
;
this
.
pos
+=
2
;
return
value
;
}
private
readU32
(
)
:
number
{
const
value
=
this
.
view
.
getUint32
(
this
.
pos
)
;
this
.
pos
+=
4
;
return
value
;
}
private
readI32
(
)
:
number
{
const
value
=
this
.
view
.
getInt32
(
this
.
pos
)
;
this
.
pos
+=
4
;
return
value
;
}
private
readU64
(
)
:
number
{
const
value
=
getUint64
(
this
.
view
,
this
.
pos
)
;
this
.
pos
+=
8
;
return
value
;
}
private
readI64
(
)
:
number
{
const
value
=
getInt64
(
this
.
view
,
this
.
pos
)
;
this
.
pos
+=
8
;
return
value
;
}
private
readU64AsBigInt
(
)
:
bigint
{
const
value
=
this
.
view
.
getBigUint64
(
this
.
pos
)
;
this
.
pos
+=
8
;
return
value
;
}
private
readI64AsBigInt
(
)
:
bigint
{
const
value
=
this
.
view
.
getBigInt64
(
this
.
pos
)
;
this
.
pos
+=
8
;
return
value
;
}
private
readF32
(
)
{
const
value
=
this
.
view
.
getFloat32
(
this
.
pos
)
;
this
.
pos
+=
4
;
return
value
;
}
private
readF64
(
)
{
const
value
=
this
.
view
.
getFloat64
(
this
.
pos
)
;
this
.
pos
+=
8
;
return
value
;
}
}
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