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JavaScript-ID3-Reader/src/binaryfile.js at master · hanbitgaramsource/JavaScript-ID3-Reader · GitHub
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src
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binaryfile.js
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JavaScript-ID3-Reader
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src
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binaryfile.js
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var
StringUtils
=
require
(
'./stringutils'
)
;
/**
*
@constructor
*/
function
BinaryFile
(
strData
,
iDataOffset
,
iDataLength
)
{
var
data
=
strData
;
var
dataOffset
=
iDataOffset
||
0
;
var
dataLength
=
0
;
this
.
getRawData
=
function
(
)
{
return
data
;
}
;
if
(
typeof
strData
==
"string"
)
{
dataLength
=
iDataLength
||
data
.
length
;
this
.
getByteAt
=
function
(
iOffset
)
{
return
data
.
charCodeAt
(
iOffset
+
dataOffset
)
&
0xFF
;
}
;
}
else
if
(
typeof
strData
==
"unknown"
)
{
dataLength
=
iDataLength
||
IEBinary_getLength
(
data
)
;
this
.
getByteAt
=
function
(
iOffset
)
{
return
IEBinary_getByteAt
(
data
,
iOffset
+
dataOffset
)
;
}
;
}
//
@aadsm
this
.
getBytesAt
=
function
(
iOffset
,
iLength
)
{
var
bytes
=
new
Array
(
iLength
)
;
for
(
var
i
=
0
;
i
<
iLength
;
i
++
)
{
bytes
[
i
]
=
this
.
getByteAt
(
iOffset
+
i
)
;
}
return
bytes
;
}
;
this
.
getLength
=
function
(
)
{
return
dataLength
;
}
;
//
@aadsm
this
.
isBitSetAt
=
function
(
iOffset
,
iBit
)
{
var
iByte
=
this
.
getByteAt
(
iOffset
)
;
return
(
iByte
&
(
1
<<
iBit
)
)
!=
0
;
}
;
this
.
getSByteAt
=
function
(
iOffset
)
{
var
iByte
=
this
.
getByteAt
(
iOffset
)
;
if
(
iByte
>
127
)
return
iByte
-
256
;
else
return
iByte
;
}
;
this
.
getShortAt
=
function
(
iOffset
,
bBigEndian
)
{
var
iShort
=
bBigEndian
?
(
this
.
getByteAt
(
iOffset
)
<<
8
)
+
this
.
getByteAt
(
iOffset
+
1
)
:
(
this
.
getByteAt
(
iOffset
+
1
)
<<
8
)
+
this
.
getByteAt
(
iOffset
)
;
if
(
iShort
<
0
)
iShort
+=
65536
;
return
iShort
;
}
;
this
.
getSShortAt
=
function
(
iOffset
,
bBigEndian
)
{
var
iUShort
=
this
.
getShortAt
(
iOffset
,
bBigEndian
)
;
if
(
iUShort
>
32767
)
return
iUShort
-
65536
;
else
return
iUShort
;
}
;
this
.
getLongAt
=
function
(
iOffset
,
bBigEndian
)
{
var
iByte1
=
this
.
getByteAt
(
iOffset
)
,
iByte2
=
this
.
getByteAt
(
iOffset
+
1
)
,
iByte3
=
this
.
getByteAt
(
iOffset
+
2
)
,
iByte4
=
this
.
getByteAt
(
iOffset
+
3
)
;
var
iLong
=
bBigEndian
?
(
(
(
(
(
iByte1
<<
8
)
+
iByte2
)
<<
8
)
+
iByte3
)
<<
8
)
+
iByte4
:
(
(
(
(
(
iByte4
<<
8
)
+
iByte3
)
<<
8
)
+
iByte2
)
<<
8
)
+
iByte1
;
if
(
iLong
<
0
)
iLong
+=
4294967296
;
return
iLong
;
}
;
this
.
getSLongAt
=
function
(
iOffset
,
bBigEndian
)
{
var
iULong
=
this
.
getLongAt
(
iOffset
,
bBigEndian
)
;
if
(
iULong
>
2147483647
)
return
iULong
-
4294967296
;
else
return
iULong
;
}
;
//
@aadsm
this
.
getInteger24At
=
function
(
iOffset
,
bBigEndian
)
{
var
iByte1
=
this
.
getByteAt
(
iOffset
)
,
iByte2
=
this
.
getByteAt
(
iOffset
+
1
)
,
iByte3
=
this
.
getByteAt
(
iOffset
+
2
)
;
var
iInteger
=
bBigEndian
?
(
(
(
(
iByte1
<<
8
)
+
iByte2
)
<<
8
)
+
iByte3
)
:
(
(
(
(
iByte3
<<
8
)
+
iByte2
)
<<
8
)
+
iByte1
)
;
if
(
iInteger
<
0
)
iInteger
+=
16777216
;
return
iInteger
;
}
;
this
.
getStringAt
=
function
(
iOffset
,
iLength
)
{
var
aStr
=
[
]
;
for
(
var
i
=
iOffset
,
j
=
0
;
i
<
iOffset
+
iLength
;
i
++
,
j
++
)
{
aStr
[
j
]
=
String
.
fromCharCode
(
this
.
getByteAt
(
i
)
)
;
}
return
aStr
.
join
(
""
)
;
}
;
//
@aadsm
this
.
getStringWithCharsetAt
=
function
(
iOffset
,
iLength
,
iCharset
)
{
var
bytes
=
this
.
getBytesAt
(
iOffset
,
iLength
)
;
var
sString
;
switch
(
iCharset
.
toLowerCase
(
)
)
{
case
'utf-16'
:
case
'utf-16le'
:
case
'utf-16be'
:
sString
=
StringUtils
.
readUTF16String
(
bytes
,
iCharset
)
;
break
;
case
'utf-8'
:
sString
=
StringUtils
.
readUTF8String
(
bytes
)
;
break
;
default
:
sString
=
StringUtils
.
readNullTerminatedString
(
bytes
)
;
break
;
}
return
sString
;
}
;
this
.
getCharAt
=
function
(
iOffset
)
{
return
String
.
fromCharCode
(
this
.
getByteAt
(
iOffset
)
)
;
}
;
this
.
toBase64
=
function
(
)
{
return
b64utils
.
btoa
(
data
)
;
}
;
this
.
fromBase64
=
function
(
strBase64
)
{
data
=
b64utils
.
atob
(
strBase64
)
;
}
;
this
.
loadRange
=
function
(
range
,
callback
)
{
callback
(
)
;
}
;
}
var
b64utils
=
{
}
;
if
(
typeof
document
!==
'undefined'
)
{
var
js
=
document
.
createElement
(
'script'
)
;
js
.
type
=
'text/vbscript'
;
js
.
textContent
=
"Function IEBinary_getByteAt(strBinary, iOffset)\r\n"
+
" IEBinary_getByteAt = AscB(MidB(strBinary,iOffset+1,1))\r\n"
+
"End Function\r\n"
+
"Function IEBinary_getLength(strBinary)\r\n"
+
" IEBinary_getLength = LenB(strBinary)\r\n"
+
"End Function\r\n"
;
document
.
getElementsByTagName
(
'head'
)
[
0
]
.
appendChild
(
js
)
;
b64utils
.
btoa
=
window
.
btoa
;
b64utils
.
atob
=
window
.
atob
;
}
else
{
b64utils
.
btoa
=
require
(
'btoa'
)
;
b64utils
.
atob
=
require
(
'atob'
)
;
}
module
.
exports
=
BinaryFile
;
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