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JSON-java/zip/BitInputStream.java at master · pradeepsimhanp/JSON-java · GitHub
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package
org
.
json
.
zip
;
import
java
.
io
.
IOException
;
import
java
.
io
.
InputStream
;
/*
Copyright (c) 2013 JSON.org
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 shall be used for Good, not Evil.
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.
*/
/**
* This is a big endian bit reader. It reads its bits from an InputStream.
*
* @version 2013-04-18
*
*/
public
class
BitInputStream
implements
BitReader
{
/**
* 2^n - 1
*/
static
final
int
[]
mask
= {
0
,
1
,
3
,
7
,
15
,
31
,
63
,
127
,
255
};
/**
* The number of bits remaining in the current byte.
*/
private
int
available
=
0
;
/**
* Up to a byte's worth of unread bits.
*/
private
int
unread
=
0
;
/**
* The source of the bits.
*/
private
InputStream
in
;
/**
* The number of bits read so far. This is used in padding.
*/
private
long
nrBits
=
0
;
/**
* Make a BitReader from an InputStream. The BitReader will take bytes from
* the InputStream and unpack them into bits.
*
* @param in
* An InputStream.
*/
public
BitInputStream
(
InputStream
in
) {
this
.
in
=
in
;
}
/**
* Make a BitReader. The first byte is passed in explicitly, the remaining
* bytes are obtained from the InputStream. This makes it possible to look
* at the first byte of a stream before deciding that it should be read as
* bits.
*
* @param in
* An InputStream
* @param firstByte
* The first byte, which was probably read from in.
*/
public
BitInputStream
(
InputStream
in
,
int
firstByte
) {
this
.
in
=
in
;
this
.
unread
=
firstByte
;
this
.
available
=
8
;
}
/**
* Read one bit.
*
* @return true if it is a 1 bit.
*/
public
boolean
bit
()
throws
IOException
{
return
read
(
1
) !=
0
;
}
/**
* Get the number of bits that have been read from this BitInputStream.
* This includes pad bits that have been skipped, but might not include
* bytes that have been read from the underlying InputStream that have not
* yet been delivered as bits.
*
* @return The number of bits read so far.
*/
public
long
nrBits
() {
return
this
.
nrBits
;
}
/**
* Check that the rest of the block has been padded with zeroes.
*
* @param factor
* The size of the block to pad. This will typically be 8, 16,
* 32, 64, 128, 256, etc.
* @return true if the block was zero padded, or false if the the padding
* contains any one bits.
* @throws IOException
*/
public
boolean
pad
(
int
factor
)
throws
IOException
{
int
padding
=
factor
- (
int
) (
this
.
nrBits
%
factor
);
boolean
result
=
true
;
for
(
int
i
=
0
;
i
<
padding
;
i
+=
1
) {
if
(
bit
()) {
result
=
false
;
}
}
return
result
;
}
/**
* Read some bits.
*
* @param width
* The number of bits to read. (0..32)
* @throws IOException
* @return the bits
*/
public
int
read
(
int
width
)
throws
IOException
{
if
(
width
==
0
) {
return
0
;
}
if
(
width
<
0
||
width
>
32
) {
throw
new
IOException
(
"Bad read width."
);
}
int
result
=
0
;
while
(
width
>
0
) {
if
(
this
.
available
==
0
) {
this
.
unread
=
this
.
in
.
read
();
if
(
this
.
unread
<
0
) {
throw
new
IOException
(
"Attempt to read past end."
);
}
this
.
available
=
8
;
}
int
take
=
width
;
if
(
take
>
this
.
available
) {
take
=
this
.
available
;
}
result
|= ((
this
.
unread
>>> (
this
.
available
-
take
)) &
mask
[
take
])
<< (
width
-
take
);
this
.
nrBits
+=
take
;
this
.
available
-=
take
;
width
-=
take
;
}
return
result
;
}
}
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