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Created
Tue, Sep 3, 09:20
Size
2 KB
Mime Type
text/x-java
Expires
Thu, Sep 5, 09:20 (2 d)
Engine
blob
Format
Raw Data
Handle
20479733
Attached To
rOACCT Open Access Compliance Check Tool (OACCT)
resize.js
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import
{
encodeU32
}
from
"@webassemblyjs/wasm-gen"
;
import
{
getSectionMetadata
,
traverse
,
shiftSection
}
from
"@webassemblyjs/ast"
;
import
{
overrideBytesInBuffer
}
from
"@webassemblyjs/helper-buffer"
;
export
function
resizeSectionByteSize
(
ast
,
uint8Buffer
,
section
,
deltaBytes
)
{
var
sectionMetadata
=
getSectionMetadata
(
ast
,
section
);
if
(
typeof
sectionMetadata
===
"undefined"
)
{
throw
new
Error
(
"Section metadata not found"
);
}
if
(
typeof
sectionMetadata
.
size
.
loc
===
"undefined"
)
{
throw
new
Error
(
"SectionMetadata "
+
section
+
" has no loc"
);
}
// keep old node location to be overriden
var
start
=
sectionMetadata
.
size
.
loc
.
start
.
column
;
var
end
=
sectionMetadata
.
size
.
loc
.
end
.
column
;
var
newSectionSize
=
sectionMetadata
.
size
.
value
+
deltaBytes
;
var
newBytes
=
encodeU32
(
newSectionSize
);
/**
* update AST
*/
sectionMetadata
.
size
.
value
=
newSectionSize
;
var
oldu32EncodedLen
=
end
-
start
;
var
newu32EncodedLen
=
newBytes
.
length
;
// the new u32 has a different encoded length
if
(
newu32EncodedLen
!==
oldu32EncodedLen
)
{
var
deltaInSizeEncoding
=
newu32EncodedLen
-
oldu32EncodedLen
;
sectionMetadata
.
size
.
loc
.
end
.
column
=
start
+
newu32EncodedLen
;
deltaBytes
+=
deltaInSizeEncoding
;
// move the vec size pointer size the section size is now smaller
sectionMetadata
.
vectorOfSize
.
loc
.
start
.
column
+=
deltaInSizeEncoding
;
sectionMetadata
.
vectorOfSize
.
loc
.
end
.
column
+=
deltaInSizeEncoding
;
}
// 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
,
deltaBytes
);
}
}
});
return
overrideBytesInBuffer
(
uint8Buffer
,
start
,
end
,
newBytes
);
}
export
function
resizeSectionVecSize
(
ast
,
uint8Buffer
,
section
,
deltaElements
)
{
var
sectionMetadata
=
getSectionMetadata
(
ast
,
section
);
if
(
typeof
sectionMetadata
===
"undefined"
)
{
throw
new
Error
(
"Section metadata not found"
);
}
if
(
typeof
sectionMetadata
.
vectorOfSize
.
loc
===
"undefined"
)
{
throw
new
Error
(
"SectionMetadata "
+
section
+
" has no loc"
);
}
// Section has no vector
if
(
sectionMetadata
.
vectorOfSize
.
value
===
-
1
)
{
return
uint8Buffer
;
}
// keep old node location to be overriden
var
start
=
sectionMetadata
.
vectorOfSize
.
loc
.
start
.
column
;
var
end
=
sectionMetadata
.
vectorOfSize
.
loc
.
end
.
column
;
var
newValue
=
sectionMetadata
.
vectorOfSize
.
value
+
deltaElements
;
var
newBytes
=
encodeU32
(
newValue
);
// Update AST
sectionMetadata
.
vectorOfSize
.
value
=
newValue
;
sectionMetadata
.
vectorOfSize
.
loc
.
end
.
column
=
start
+
newBytes
.
length
;
return
overrideBytesInBuffer
(
uint8Buffer
,
start
,
end
,
newBytes
);
}
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