/
Unpacker.pm6
212 lines (188 loc) · 9.78 KB
/
Unpacker.pm6
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use v6;
my @lookup-table =
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41,
0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62,
0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d,
0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
sub ($b, $position is rw) { _unpack-map($b, $position, 0x0) }, # 0x80
sub ($b, $position is rw) { _unpack-map($b, $position, 0x1) }, # 0x81
sub ($b, $position is rw) { _unpack-map($b, $position, 0x2) }, # 0x82
sub ($b, $position is rw) { _unpack-map($b, $position, 0x3) }, # 0x83
sub ($b, $position is rw) { _unpack-map($b, $position, 0x4) }, # 0x84
sub ($b, $position is rw) { _unpack-map($b, $position, 0x5) }, # 0x85
sub ($b, $position is rw) { _unpack-map($b, $position, 0x6) }, # 0x86
sub ($b, $position is rw) { _unpack-map($b, $position, 0x7) }, # 0x87
sub ($b, $position is rw) { _unpack-map($b, $position, 0x8) }, # 0x88
sub ($b, $position is rw) { _unpack-map($b, $position, 0x9) }, # 0x89
sub ($b, $position is rw) { _unpack-map($b, $position, 0xa) }, # 0x8a
sub ($b, $position is rw) { _unpack-map($b, $position, 0xb) }, # 0x8b
sub ($b, $position is rw) { _unpack-map($b, $position, 0xc) }, # 0x8c
sub ($b, $position is rw) { _unpack-map($b, $position, 0xd) }, # 0x8d
sub ($b, $position is rw) { _unpack-map($b, $position, 0xe) }, # 0x8e
sub ($b, $position is rw) { _unpack-map($b, $position, 0xf) }, # 0x8f
sub ($b, $position is rw) { _unpack-array($b, $position, 0x0) }, # 0x90
sub ($b, $position is rw) { _unpack-array($b, $position, 0x1) }, # 0x91
sub ($b, $position is rw) { _unpack-array($b, $position, 0x2) }, # 0x92
sub ($b, $position is rw) { _unpack-array($b, $position, 0x3) }, # 0x93
sub ($b, $position is rw) { _unpack-array($b, $position, 0x4) }, # 0x94
sub ($b, $position is rw) { _unpack-array($b, $position, 0x5) }, # 0x95
sub ($b, $position is rw) { _unpack-array($b, $position, 0x6) }, # 0x96
sub ($b, $position is rw) { _unpack-array($b, $position, 0x7) }, # 0x97
sub ($b, $position is rw) { _unpack-array($b, $position, 0x8) }, # 0x98
sub ($b, $position is rw) { _unpack-array($b, $position, 0x9) }, # 0x99
sub ($b, $position is rw) { _unpack-array($b, $position, 0xa) }, # 0x9a
sub ($b, $position is rw) { _unpack-array($b, $position, 0xb) }, # 0x9b
sub ($b, $position is rw) { _unpack-array($b, $position, 0xc) }, # 0x9c
sub ($b, $position is rw) { _unpack-array($b, $position, 0xd) }, # 0x9d
sub ($b, $position is rw) { _unpack-array($b, $position, 0xe) }, # 0x9e
sub ($b, $position is rw) { _unpack-array($b, $position, 0xf) }, # 0x9f
sub ($b, $position is rw) { _unpack-string($b, $position, 0x00) }, # 0xa0
sub ($b, $position is rw) { _unpack-string($b, $position, 0x01) }, # 0xa1
sub ($b, $position is rw) { _unpack-string($b, $position, 0x02) }, # 0xa2
sub ($b, $position is rw) { _unpack-string($b, $position, 0x03) }, # 0xa3
sub ($b, $position is rw) { _unpack-string($b, $position, 0x04) }, # 0xa4
sub ($b, $position is rw) { _unpack-string($b, $position, 0x05) }, # 0xa5
sub ($b, $position is rw) { _unpack-string($b, $position, 0x06) }, # 0xa6
sub ($b, $position is rw) { _unpack-string($b, $position, 0x07) }, # 0xa7
sub ($b, $position is rw) { _unpack-string($b, $position, 0x08) }, # 0xa8
sub ($b, $position is rw) { _unpack-string($b, $position, 0x09) }, # 0xa9
sub ($b, $position is rw) { _unpack-string($b, $position, 0x0a) }, # 0xaa
sub ($b, $position is rw) { _unpack-string($b, $position, 0x0b) }, # 0xab
sub ($b, $position is rw) { _unpack-string($b, $position, 0x0c) }, # 0xac
sub ($b, $position is rw) { _unpack-string($b, $position, 0x0d) }, # 0xad
sub ($b, $position is rw) { _unpack-string($b, $position, 0x0e) }, # 0xae
sub ($b, $position is rw) { _unpack-string($b, $position, 0x0f) }, # 0xaf
sub ($b, $position is rw) { _unpack-string($b, $position, 0x10) }, # 0xb0
sub ($b, $position is rw) { _unpack-string($b, $position, 0x11) }, # 0xb1
sub ($b, $position is rw) { _unpack-string($b, $position, 0x12) }, # 0xb2
sub ($b, $position is rw) { _unpack-string($b, $position, 0x13) }, # 0xb3
sub ($b, $position is rw) { _unpack-string($b, $position, 0x14) }, # 0xb4
sub ($b, $position is rw) { _unpack-string($b, $position, 0x15) }, # 0xb5
sub ($b, $position is rw) { _unpack-string($b, $position, 0x16) }, # 0xb6
sub ($b, $position is rw) { _unpack-string($b, $position, 0x17) }, # 0xb7
sub ($b, $position is rw) { _unpack-string($b, $position, 0x18) }, # 0xb8
sub ($b, $position is rw) { _unpack-string($b, $position, 0x19) }, # 0xb9
sub ($b, $position is rw) { _unpack-string($b, $position, 0x1a) }, # 0xba
sub ($b, $position is rw) { _unpack-string($b, $position, 0x1b) }, # 0xbb
sub ($b, $position is rw) { _unpack-string($b, $position, 0x1c) }, # 0xbc
sub ($b, $position is rw) { _unpack-string($b, $position, 0x1d) }, # 0xbd
sub ($b, $position is rw) { _unpack-string($b, $position, 0x1e) }, # 0xbe
sub ($b, $position is rw) { _unpack-string($b, $position, 0x1f) }, # 0xbf
Any, # 0xc0
Failure, # 0xc1
False, # 0xc2
True, # 0xc3
sub ($b, $position is rw) { _unpack-bin($b, $position, _unpack-uint( $b, $position, 1 )) },
sub ($b, $position is rw) { _unpack-bin($b, $position, _unpack-uint( $b, $position, 2 )) },
sub ($b, $position is rw) { _unpack-bin($b, $position, _unpack-uint( $b, $position, 4 )) },
Failure, # 0xc7
Failure, # 0xc8
Failure, # 0xc9
&_unpack-float, # 0xca
&_unpack-double, # 0xcb
sub ($b, $position is rw) { _unpack-uint($b, $position, 1) }, # 0xcc
sub ($b, $position is rw) { _unpack-uint($b, $position, 2) }, # 0xcd
sub ($b, $position is rw) { _unpack-uint($b, $position, 4) }, # 0xce
sub ($b, $position is rw) { _unpack-uint($b, $position, 8) }, # 0xcf
sub ($b, $position is rw) { _unpack-uint($b, $position, 1 ) -^ 0xff - 1 },
sub ($b, $position is rw) { _unpack-uint($b, $position, 2 ) -^ 0xffff - 1 },
sub ($b, $position is rw) { _unpack-uint($b, $position, 4 ) -^ 0xffffffff - 1 },
sub ($b, $position is rw) { _unpack-uint($b, $position, 8 ) -^ 0xffffffffffffffff - 1 },
Failure, # 0xd4
Failure, # 0xd5
Failure, # 0xd6
Failure, # 0xd7
Failure, # 0xd8
sub ($b, $position is rw) { _unpack-string($b, $position, _unpack-uint($b, $position, 1) ) },
sub ($b, $position is rw) { _unpack-string($b, $position, _unpack-uint($b, $position, 2) ) },
sub ($b, $position is rw) { _unpack-string($b, $position, _unpack-uint($b, $position, 4) ) },
sub ($b, $position is rw) { _unpack-array($b, $position, _unpack-uint($b, $position, 2) ) },
sub ($b, $position is rw) { _unpack-array($b, $position, _unpack-uint($b, $position, 4) ) },
sub ($b, $position is rw) { _unpack-map($b, $position, _unpack-uint($b, $position, 2) ) },
sub ($b, $position is rw) { _unpack-map($b, $position, _unpack-uint($b, $position, 4) ) },
-0x20, -0x1f, -0x1e, -0x1d, -0x1c, -0x1b, -0x1a, -0x19, -0x18,
-0x17, -0x16, -0x15, -0x14, -0x13, -0x12, -0x11, -0x10, -0x0f,
-0x0e, -0x0d, -0x0c, -0x0b, -0x0a, -0x09, -0x08, -0x07, -0x06,
-0x05, -0x04, -0x03, -0x02, -0x01
;
module Data::MessagePack::Unpacker {
our sub unpack( Blob $b ) {
my $position = 0;
_unpack( $b, $position );
}
}
sub _unpack( Blob $b, Int $position is rw ) {
my $next = @lookup-table[$b[$position++]];
$next ~~ Callable ?? $next($b, $position) !! $next;
}
sub _unpack-array( Blob $b, Int $position is rw, Int $elems ) {
my @array = ();
for ^$elems {
@array.push(
_unpack($b, $position)
);
}
@array;
}
sub _unpack-map( Blob $b, Int $position is rw, Int $elems ) {
my %map = ();
for ^$elems {
%map{ _unpack($b, $position) } = _unpack($b, $position);
}
%map;
}
sub _unpack-uint( Blob $b, Int $position is rw, Int $byte-count ) {
my Int $res = 0;
for ^$byte-count {
$res +<= 8;
$res += $b[$position++];
}
$res;
}
sub _unpack-bin( Blob $b, Int $position is rw, Int $length ) {
my $blob = $b.subbuf($position, $length);
$position += $length;
$blob;
}
sub _unpack-string( Blob $b, Int $position is rw, Int $length ) {
my $str = $b.subbuf($position, $length).decode;
$position += $length;
$str;
}
sub _unpack-float( Blob $b, Int $position is rw ) {
my $raw = 0;
for ^4 {
$raw +<= 8;
$raw += $b[$position++];
}
return 0.0 if $raw == 0;
my $s = $raw +& 0x80000000 ?? -1 !! 1;
my $exp = ( $raw +> 23 ) +& 0xff;
$exp -= 127;
my $mantissa = $raw +& 0x7FFFFF;
$mantissa = 1 + ( $mantissa / 2**23 );
$s * $mantissa * 2**$exp;
}
sub _unpack-double( Blob $b, Int $position is rw ) {
my $raw = 0;
for ^8 {
$raw +<= 8;
$raw += $b[$position++];
}
return 0.0 if $raw == 0;
my $s = $raw +& 0x8000000000000000 ?? -1 !! 1;
my $exp = ( $raw +> 52 ) +& 0x7ff;
$exp -= 1023;
my $mantissa = $raw +& 0x0FFFFFFFFFFFFF;
$mantissa = 1 + ( $mantissa / 2**52 );
$s * $mantissa * 2**$exp;
}
# vim: ft=perl6