forked from projectmoon/tenebrous-dicebot
47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
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;
|
|
} |