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leb128.js
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Created
Thu, Sep 12, 13:30
Size
1 KB
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text/x-java
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Sat, Sep 14, 13:30 (2 d)
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blob
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rOACCT Open Access Compliance Check Tool (OACCT)
leb128.js
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import
{
traverse
,
shiftSection
}
from
"@webassemblyjs/ast"
;
import
{
encodeU32
}
from
"@webassemblyjs/wasm-gen/lib/encoder"
;
import
{
overrideBytesInBuffer
}
from
"@webassemblyjs/helper-buffer"
;
function
shiftFollowingSections
(
ast
,
_ref
,
deltaInSizeEncoding
)
{
var
section
=
_ref
.
section
;
// Once we hit our section every that is after needs to be shifted by the delta
var
encounteredSection
=
false
;
traverse
(
ast
,
{
SectionMetadata
:
function
SectionMetadata
(
path
)
{
if
(
path
.
node
.
section
===
section
)
{
encounteredSection
=
true
;
return
;
}
if
(
encounteredSection
===
true
)
{
shiftSection
(
ast
,
path
.
node
,
deltaInSizeEncoding
);
}
}
});
}
export
function
shrinkPaddedLEB128
(
ast
,
uint8Buffer
)
{
traverse
(
ast
,
{
SectionMetadata
:
function
SectionMetadata
(
_ref2
)
{
var
node
=
_ref2
.
node
;
/**
* Section size
*/
{
var
newu32Encoded
=
encodeU32
(
node
.
size
.
value
);
var
newu32EncodedLen
=
newu32Encoded
.
length
;
var
start
=
node
.
size
.
loc
.
start
.
column
;
var
end
=
node
.
size
.
loc
.
end
.
column
;
var
oldu32EncodedLen
=
end
-
start
;
if
(
newu32EncodedLen
!==
oldu32EncodedLen
)
{
var
deltaInSizeEncoding
=
oldu32EncodedLen
-
newu32EncodedLen
;
uint8Buffer
=
overrideBytesInBuffer
(
uint8Buffer
,
start
,
end
,
newu32Encoded
);
shiftFollowingSections
(
ast
,
node
,
-
deltaInSizeEncoding
);
}
}
}
});
return
uint8Buffer
;
}
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