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Display in data inspector ULEB128 and SLEB128 #488

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merged 5 commits into from
Feb 20, 2024
Merged

Display in data inspector ULEB128 and SLEB128 #488

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758be65
Display in data inspector ULEB128 and SLEB128
jogo- Feb 17, 2024
82ed577
Catch exceptions
jogo- Feb 17, 2024
cafd39c
Add limit
jogo- Feb 19, 2024
031e609
Add limit
jogo- Feb 19, 2024
c6c9f61
Remove the try/catch
jogo- Feb 20, 2024
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52 changes: 52 additions & 0 deletions media/editor/dataInspectorProperties.tsx
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Original file line number Diff line number Diff line change
@@ -1,3 +1,52 @@
/** Reads a ULEB128 at offset 0 from the buffer. */
const getULEB128 = (arrayBuffer: ArrayBuffer) => {
const buf = new Uint8Array(arrayBuffer);

let result = 0n;
let shift = 0n;
let index = 0;
try {
while (true) {
if (shift > 128n) {
return "";
}
const byte: bigint = BigInt(buf[index++]);
result |= (byte & 0x7Fn) << shift;
if ((0x80n & byte) === 0n) {
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return result;
}
shift += 7n;
}
} catch {
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return "";
}
};

/** Reads a SLEB128 at offset 0 from the buffer. */
const getSLEB128 = (arrayBuffer: ArrayBuffer) => {
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const buf = new Uint8Array(arrayBuffer);

let result = 0n;
let shift = 0n;
let index = 0;
try {
while (true) {
const byte: bigint = BigInt(buf[index++]);
result |= (byte & 0x7Fn) << shift;
shift += 7n;
if ((0x80n & byte) === 0n) {
if (shift < 128n && (byte & 0x40n) !== 0n) {
result |= (~0n << shift);
return result;
}
return result;
}
}
} catch {
return "";
}
};

/** Reads a uint24 at offset 0 from the buffer. */
const getUint24 = (arrayBuffer: ArrayBuffer, le: boolean) => {
const buf = new Uint8Array(arrayBuffer);
Expand Down Expand Up @@ -66,6 +115,9 @@ const inspectTypesBuilder: IInspectableType[] = [
{ label: "uint64", minBytes: 8, convert: (dv, le) => dv.getBigUint64(0, le).toString() },
{ label: "int64", minBytes: 8, convert: (dv, le) => dv.getBigInt64(0, le).toString() },

{ label: "ULEB128", minBytes: 1, convert: dv => getULEB128(dv.buffer).toString() },
{ label: "SLEB128", minBytes: 1, convert: dv => getSLEB128(dv.buffer).toString() },

{
label: "float16",
minBytes: 2,
Expand Down