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//
Copyright (c) 2009-2010 Satoshi Nakamoto
//
Copyright (c) 2009-2017 The Bitcoin Core developers
//
Distributed under the MIT software license, see the accompanying
//
file COPYING or http://www.opensource.org/licenses/mit-license.php.
#
include
<
compressor.h
>
#
include
<
hash.h
>
#
include
<
pubkey.h
>
#
include
<
script/standard.h
>
bool
CScriptCompressor::IsToKeyID
(CKeyID &hash)
const
{
if
(script.
size
() ==
25
&& script[
0
] ==
OP_DUP
&& script[
1
] ==
OP_HASH160
&& script[
2
] ==
20
&& script[
23
] ==
OP_EQUALVERIFY
&& script[
24
] ==
OP_CHECKSIG
) {
memcpy
(&hash, &script[
3
],
20
);
return
true
;
}
return
false
;
}
bool
CScriptCompressor::IsToScriptID
(CScriptID &hash)
const
{
if
(script.
size
() ==
23
&& script[
0
] ==
OP_HASH160
&& script[
1
] ==
20
&& script[
22
] ==
OP_EQUAL
) {
memcpy
(&hash, &script[
2
],
20
);
return
true
;
}
return
false
;
}
bool
CScriptCompressor::IsToPubKey
(CPubKey &pubkey)
const
{
if
(script.
size
() ==
35
&& script[
0
] ==
33
&& script[
34
] ==
OP_CHECKSIG
&& (script[
1
] ==
0x02
|| script[
1
] ==
0x03
)) {
pubkey.
Set
(&script[
1
], &script[
34
]);
return
true
;
}
if
(script.
size
() ==
67
&& script[
0
] ==
65
&& script[
66
] ==
OP_CHECKSIG
&& script[
1
] ==
0x04
) {
pubkey.
Set
(&script[
1
], &script[
66
]);
return
pubkey.
IsFullyValid
();
//
if not fully valid, a case that would not be compressible
}
return
false
;
}
bool
CScriptCompressor::Compress
(std::vector<
unsigned
char
> &out)
const
{
CKeyID keyID;
if
(
IsToKeyID
(keyID)) {
out.
resize
(
21
);
out[
0
] =
0x00
;
memcpy
(&out[
1
], &keyID,
20
);
return
true
;
}
CScriptID scriptID;
if
(
IsToScriptID
(scriptID)) {
out.
resize
(
21
);
out[
0
] =
0x01
;
memcpy
(&out[
1
], &scriptID,
20
);
return
true
;
}
CPubKey pubkey;
if
(
IsToPubKey
(pubkey)) {
out.
resize
(
33
);
memcpy
(&out[
1
], &pubkey[
1
],
32
);
if
(pubkey[
0
] ==
0x02
|| pubkey[
0
] ==
0x03
) {
out[
0
] = pubkey[
0
];
return
true
;
}
else
if
(pubkey[
0
] ==
0x04
) {
out[
0
] =
0x04
| (pubkey[
64
] &
0x01
);
return
true
;
}
}
return
false
;
}
unsigned
int
CScriptCompressor::GetSpecialSize
(
unsigned
int
nSize)
const
{
if
(nSize ==
0
|| nSize ==
1
)
return
20
;
if
(nSize ==
2
|| nSize ==
3
|| nSize ==
4
|| nSize ==
5
)
return
32
;
return
0
;
}
bool
CScriptCompressor::Decompress
(
unsigned
int
nSize,
const
std::vector<
unsigned
char
> &in)
{
switch
(nSize) {
case
0x00
:
script.
resize
(
25
);
script[
0
] =
OP_DUP
;
script[
1
] =
OP_HASH160
;
script[
2
] =
20
;
memcpy
(&script[
3
], in.
data
(),
20
);
script[
23
] =
OP_EQUALVERIFY
;
script[
24
] =
OP_CHECKSIG
;
return
true
;
case
0x01
:
script.
resize
(
23
);
script[
0
] =
OP_HASH160
;
script[
1
] =
20
;
memcpy
(&script[
2
], in.
data
(),
20
);
script[
22
] =
OP_EQUAL
;
return
true
;
case
0x02
:
case
0x03
:
script.
resize
(
35
);
script[
0
] =
33
;
script[
1
] = nSize;
memcpy
(&script[
2
], in.
data
(),
32
);
script[
34
] =
OP_CHECKSIG
;
return
true
;
case
0x04
:
case
0x05
:
unsigned
char
vch[
33
] = {};
vch[
0
] = nSize -
2
;
memcpy
(&vch[
1
], in.
data
(),
32
);
CPubKey
pubkey
(&vch[
0
], &vch[
33
]);
if
(!pubkey.
Decompress
())
return
false
;
assert
(pubkey.
size
() ==
65
);
script.
resize
(
67
);
script[
0
] =
65
;
memcpy
(&script[
1
], pubkey.
begin
(),
65
);
script[
66
] =
OP_CHECKSIG
;
return
true
;
}
return
false
;
}
//
Amount compression:
//
* If the amount is 0, output 0
//
* first, divide the amount (in base units) by the largest power of 10 possible; call the exponent e (e is max 9)
//
* if e<9, the last digit of the resulting number cannot be 0; store it as d, and drop it (divide by 10)
//
* call the result n
//
* output 1 + 10*(9*n + d - 1) + e
//
* if e==9, we only know the resulting number is not zero, so output 1 + 10*(n - 1) + 9
//
(this is decodable, as d is in [1-9] and e is in [0-9])
uint64_t
CTxOutCompressor::CompressAmount
(
uint64_t
n)
{
if
(n ==
0
)
return
0
;
int
e =
0
;
while
(((n %
10
) ==
0
) && e <
9
) {
n /=
10
;
e++;
}
if
(e <
9
) {
int
d = (n %
10
);
assert
(d >=
1
&& d <=
9
);
n /=
10
;
return
1
+ (n*
9
+ d -
1
)*
10
+ e;
}
else
{
return
1
+ (n -
1
)*
10
+
9
;
}
}
uint64_t
CTxOutCompressor::DecompressAmount
(
uint64_t
x)
{
//
x = 0 OR x = 1+10*(9*n + d - 1) + e OR x = 1+10*(n - 1) + 9
if
(x ==
0
)
return
0
;
x--;
//
x = 10*(9*n + d - 1) + e
int
e = x %
10
;
x /=
10
;
uint64_t
n =
0
;
if
(e <
9
) {
//
x = 9*n + d - 1
int
d = (x %
9
) +
1
;
x /=
9
;
//
x = n
n = x*
10
+ d;
}
else
{
n = x+
1
;
}
while
(e) {
n *=
10
;
e--;
}
return
n;
}
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