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JSON-java/zip/JSONzip.java at master · galasky/JSON-java · GitHub
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package
org
.
json
.
zip
;
/*
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.
*/
/**
* JSONzip is a binary-encoded JSON dialect. It is designed to compress the
* messages in a session. It is adaptive, so with each message seen, it should
* improve its compression. It minimizes JSON's overhead, reducing punctuation
* to a small number of bits. It uses Huffman encoding to reduce the average
* size of characters. It uses caches (or Keeps) to keep recently seen strings
* and values, so repetitive content (such as object keys) can be
* substantially reduced. It uses a character encoding called Kim (Keep it
* minimal) that is smaller than UTF-8 for most East European, African, and
* Asian scripts.
*
* JSONzip tends to reduce most content by about half. If there is a lot of
* recurring information, the reduction can be much more dramatic.
*
* FOR EVALUATION PURPOSES ONLY. THIS PACKAGE HAS NOT YET BEEN TESTED
* ADEQUATELY FOR PRODUCTION USE.
*
* @author JSON.org
* @version 2013-04-18
*/
public
abstract
class
JSONzip
implements
None
,
PostMortem
{
/**
* Powers of 2.
*/
public
static
final
int
[]
twos
= {
1
,
2
,
4
,
8
,
16
,
32
,
64
,
128
,
256
,
512
,
1024
,
2048
,
4096
,
8192
,
16384
,
32768
,
65536
};
/**
* The characters in JSON numbers can be reduced to 4 bits each.
*/
public
static
final
byte
[]
bcd
= {
'0'
,
'1'
,
'2'
,
'3'
,
'4'
,
'5'
,
'6'
,
'7'
,
'8'
,
'9'
,
'.'
,
'-'
,
'+'
,
'E'
};
/**
* The number of integers that can be encoded in 4 bits.
*/
public
static
final
long
int4
=
16
;
/**
* The number of integers that can be encoded in 7 bits.
*/
public
static
final
long
int7
=
128
;
/**
* The number of integers that can be encoded in 14 bits.
*/
public
static
final
long
int14
=
16384
;
/**
* The end of string code.
*/
public
static
final
int
end
=
256
;
/**
* The end of number code.
*/
public
static
final
int
endOfNumber
=
bcd
.
length
;
/**
* The maximum substring length when registering many. The registration of
* one substring may be longer.
*/
public
static
final
int
maxSubstringLength
=
10
;
/**
* The minimum substring length.
*/
public
static
final
int
minSubstringLength
=
3
;
/**
* The package supports tracing for debugging.
*/
public
static
final
boolean
probe
=
false
;
/**
* The maximum number of substrings added to the substrings keep per
* string.
*/
public
static
final
int
substringLimit
=
40
;
/**
* The value code for an empty object.
*/
public
static
final
int
zipEmptyObject
=
0
;
/**
* The value code for an empty array.
*/
public
static
final
int
zipEmptyArray
=
1
;
/**
* The value code for true.
*/
public
static
final
int
zipTrue
=
2
;
/**
* The value code for false.
*/
public
static
final
int
zipFalse
=
3
;
/**
* The value code for null.
*/
public
static
final
int
zipNull
=
4
;
/**
* The value code for a non-empty object.
*/
public
static
final
int
zipObject
=
5
;
/**
* The value code for an array with a string as its first element.
*/
public
static
final
int
zipArrayString
=
6
;
/**
* The value code for an array with a non-string value as its first element.
*/
public
static
final
int
zipArrayValue
=
7
;
/**
* A Huffman encoder for names.
*/
protected
final
Huff
namehuff
;
/**
* A place to keep the names (keys).
*/
protected
final
MapKeep
namekeep
;
/**
* A place to keep the strings.
*/
protected
final
MapKeep
stringkeep
;
/**
* A Huffman encoder for string values.
*/
protected
final
Huff
substringhuff
;
/**
* A place to keep the strings.
*/
protected
final
TrieKeep
substringkeep
;
/**
* A place to keep the values.
*/
protected
final
MapKeep
values
;
/**
* Initialize the data structures.
*/
protected
JSONzip
() {
this
.
namehuff
=
new
Huff
(
end
+
1
);
this
.
namekeep
=
new
MapKeep
(
9
);
this
.
stringkeep
=
new
MapKeep
(
11
);
this
.
substringhuff
=
new
Huff
(
end
+
1
);
this
.
substringkeep
=
new
TrieKeep
(
12
);
this
.
values
=
new
MapKeep
(
10
);
// Increase the weights of the ASCII letters, digits, and special characters
// because they are highly likely to occur more frequently. The weight of each
// character will increase as it is used. The Huffman encoder will tend to
// use fewer bits to encode heavier characters.
this
.
namehuff
.
tick
(
' '
,
'}'
);
this
.
namehuff
.
tick
(
'a'
,
'z'
);
this
.
namehuff
.
tick
(
end
);
this
.
namehuff
.
tick
(
end
);
this
.
substringhuff
.
tick
(
' '
,
'}'
);
this
.
substringhuff
.
tick
(
'a'
,
'z'
);
this
.
substringhuff
.
tick
(
end
);
this
.
substringhuff
.
tick
(
end
);
}
/**
*
*/
protected
void
begin
() {
this
.
namehuff
.
generate
();
this
.
substringhuff
.
generate
();
}
/**
* Write an end-of-line to the console.
*/
static
void
log
() {
log
(
"
\n
"
);
}
/**
* Write an integer to the console.
*
* @param integer
*/
static
void
log
(
int
integer
) {
log
(
integer
+
" "
);
}
/**
* Write two integers, separated by ':' to the console.
*
* @param integer
* @param width
*/
static
void
log
(
int
integer
,
int
width
) {
log
(
integer
+
":"
+
width
+
" "
);
}
/**
* Write a string to the console.
*
* @param string
*/
static
void
log
(
String
string
) {
System
.
out
.
print
(
string
);
}
/**
* Write a character or its code to the console.
*
* @param integer
* @param width
*/
static
void
logchar
(
int
integer
,
int
width
) {
if
(
integer
>
' '
&&
integer
<=
'}'
) {
log
(
"'"
+ (
char
)
integer
+
"':"
+
width
+
" "
);
}
else
{
log
(
integer
,
width
);
}
}
/**
* This method is used for testing the implementation of JSONzip. It is not
* suitable for any other purpose. It is used to compare a Compressor and a
* Decompressor, verifying that the data structures that were built during
* zipping and unzipping were the same.
*
* @return true if the structures match.
*/
public
boolean
postMortem
(
PostMortem
pm
) {
JSONzip
that
= (
JSONzip
)
pm
;
return
this
.
namehuff
.
postMortem
(
that
.
namehuff
)
&&
this
.
namekeep
.
postMortem
(
that
.
namekeep
)
&&
this
.
stringkeep
.
postMortem
(
that
.
stringkeep
)
&&
this
.
substringhuff
.
postMortem
(
that
.
substringhuff
)
&&
this
.
substringkeep
.
postMortem
(
that
.
substringkeep
)
&&
this
.
values
.
postMortem
(
that
.
values
);
}
}
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