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/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
// Simple wasm parser to replace "sourceMappingURL" section.
function updateSourceMappingURLSection(buffer, sourceMapUrl) {
function readVarUint8(buf, pos) {
let b = buf[pos++];
let shift = 0;
let result = 0;
while (b & 0x80) {
result |= (b & 0x7f) << shift;
shift += 7;
b = buf[pos++];
}
return {
value: result | (b << shift),
pos
};
}
function readWasmString(buf, pos) {
const { pos: next, value: len } = readVarUint8(buf, pos);
const result = String.fromCharCode.apply(
null,
buf.subarray(next, next + len)
);
return { value: result, pos: next + len };
}
function toVarUint(n) {
const buf = [];
while (n > 127) {
buf.push((n & 0x7f) | 0x80);
n >>>= 7;
}
buf.push(n);
return buf;
}
function toWasmString(s) {
const buf = toVarUint(s.length);
for (let i = 0; i < s.length; i++) {
buf.push(s.charCodeAt(i));
}
return buf;
}
// Appending/replacing sourceMappingURL section based on
// https://github.com/WebAssembly/design/pull/1051
const mappingSectionBody = toWasmString("sourceMappingURL").concat(
toWasmString(sourceMapUrl)
);
const mappingSection = toVarUint(0).concat(
toVarUint(mappingSectionBody.length),
mappingSectionBody
);
const data = new Uint8Array(buffer);
let start = data.length,
end = data.length;
for (let i = 8; i < data.length; ) {
const { pos: next, value: id } = readVarUint8(data, i);
const { pos: next2, value: size } = readVarUint8(data, next);
if (id == 0 && readWasmString(data, next2).value === "sourceMappingURL") {
start = i;
end = next2 + size;
break;
}
i = next2 + size;
}
const result = new Uint8Array(
start + (data.length - end) + mappingSection.length
);
result.set(data.subarray(0, start));
result.set(new Uint8Array(mappingSection), start);
result.set(data.subarray(end), start + mappingSection.length);
return result.buffer;
}
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