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string_decoder.js
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict'
;
const
{
ArrayBufferIsView
,
ObjectDefineProperties
,
Symbol
,
TypedArrayPrototypeSubarray
,
}
=
primordials
;
const
{
Buffer
}
=
require
(
'buffer'
)
;
const
{
kIncompleteCharactersStart
,
kIncompleteCharactersEnd
,
kMissingBytes
,
kBufferedBytes
,
kEncodingField
,
kSize
,
decode
,
flush
,
}
=
internalBinding
(
'string_decoder'
)
;
const
{
encodingsMap
,
normalizeEncoding
,
}
=
require
(
'internal/util'
)
;
const
{
ERR_INVALID_ARG_TYPE
,
ERR_INVALID_THIS
,
ERR_UNKNOWN_ENCODING
,
}
=
require
(
'internal/errors'
)
.
codes
;
const
kNativeDecoder
=
Symbol
(
'kNativeDecoder'
)
;
/**
* StringDecoder provides an interface for efficiently splitting a series of
* buffers into a series of JS strings without breaking apart multibyte
* characters.
*
@param
{
string
} [encoding]
*/
function
StringDecoder
(
encoding
)
{
this
.
encoding
=
normalizeEncoding
(
encoding
)
;
if
(
this
.
encoding
===
undefined
)
{
throw
new
ERR_UNKNOWN_ENCODING
(
encoding
)
;
}
this
[
kNativeDecoder
]
=
Buffer
.
alloc
(
kSize
)
;
this
[
kNativeDecoder
]
[
kEncodingField
]
=
encodingsMap
[
this
.
encoding
]
;
}
/**
* Returns a decoded string, omitting any incomplete multi-bytes
* characters at the end of the Buffer, or TypedArray, or DataView
*
@param
{
string | Buffer | TypedArray | DataView
} buf
*
@returns
{
string
}
*
@throws
{
TypeError
} Throws when buf is not in one of supported types
*/
StringDecoder
.
prototype
.
write
=
function
write
(
buf
)
{
if
(
typeof
buf
===
'string'
)
return
buf
;
if
(
!
ArrayBufferIsView
(
buf
)
)
throw
new
ERR_INVALID_ARG_TYPE
(
'buf'
,
[
'Buffer'
,
'TypedArray'
,
'DataView'
]
,
buf
)
;
if
(
!
this
[
kNativeDecoder
]
)
{
throw
new
ERR_INVALID_THIS
(
'StringDecoder'
)
;
}
return
decode
(
this
[
kNativeDecoder
]
,
buf
)
;
}
;
/**
* Returns any remaining input stored in the internal buffer as a string.
* After end() is called, the stringDecoder object can be reused for new
* input.
*
@param
{
string | Buffer | TypedArray | DataView
} [buf]
*
@returns
{
string
}
*/
StringDecoder
.
prototype
.
end
=
function
end
(
buf
)
{
const
ret
=
buf
===
undefined
?
''
:
this
.
write
(
buf
)
;
if
(
this
[
kNativeDecoder
]
[
kBufferedBytes
]
>
0
)
return
ret
+
flush
(
this
[
kNativeDecoder
]
)
;
return
ret
;
}
;
/* Everything below this line is undocumented legacy stuff. */
/**
*
*
@param
{
string | Buffer | TypedArray | DataView
} buf
*
@param
{
number
} offset
*
@returns
{
string
}
*/
StringDecoder
.
prototype
.
text
=
function
text
(
buf
,
offset
)
{
this
[
kNativeDecoder
]
[
kMissingBytes
]
=
0
;
this
[
kNativeDecoder
]
[
kBufferedBytes
]
=
0
;
return
this
.
write
(
buf
.
slice
(
offset
)
)
;
}
;
ObjectDefineProperties
(
StringDecoder
.
prototype
,
{
lastChar
:
{
__proto__
:
null
,
configurable
:
true
,
enumerable
:
true
,
get
(
)
{
return
TypedArrayPrototypeSubarray
(
this
[
kNativeDecoder
]
,
kIncompleteCharactersStart
,
kIncompleteCharactersEnd
)
;
}
,
}
,
lastNeed
:
{
__proto__
:
null
,
configurable
:
true
,
enumerable
:
true
,
get
(
)
{
return
this
[
kNativeDecoder
]
[
kMissingBytes
]
;
}
,
}
,
lastTotal
:
{
__proto__
:
null
,
configurable
:
true
,
enumerable
:
true
,
get
(
)
{
return
this
[
kNativeDecoder
]
[
kBufferedBytes
]
+
this
[
kNativeDecoder
]
[
kMissingBytes
]
;
}
,
}
,
}
)
;
exports
.
StringDecoder
=
StringDecoder
;
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