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Put the const integer into local const enum, save indirection time at runtime

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This commit is contained in:
Anthony Kim
2026-02-10 16:31:17 -08:00
parent a25db1c76d
commit d9b5d150ae
1 changed files with 14 additions and 11 deletions
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addons/addon-image/src/IIPHandler.ts
+14 -11
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@@ -5,16 +5,19 @@
import { IImageAddonOptions, IOscHandler, IResetHandler, ITerminalExt } from './Types';
import { ImageRenderer } from './ImageRenderer';
import { ImageStorage, CELL_SIZE_DEFAULT } from './ImageStorage';
import Base64Decoder, { type DecodeStatus } from 'xterm-wasm-parts/lib/base64/Base64Decoder.wasm';
import Base64Decoder from 'xterm-wasm-parts/lib/base64/Base64Decoder.wasm';
import { HeaderParser, IHeaderFields, HeaderState } from './IIPHeaderParser';
import { imageType, UNSUPPORTED_TYPE } from './IIPMetrics';
// limit hold memory in base64 decoder (encoded bytes)
const KEEP_DATA = 4194304;
const INITIAL_DATA = 1048576;
// Local mirror of const enum (esbuild can't inline const enums from external packages)
const DECODER_OK: DecodeStatus.OK = 0;
// Local const enum mirror - esbuild can't inline const enums from external packages
const enum DecoderConst {
// Limit held memory in base64 decoder (encoded bytes).
KEEP_DATA = 4194304,
// Initial buffer allocation for the decoder.
INITIAL_DATA = 1048576,
// Local mirror of const enum (esbuild can't inline const enums from external packages)
OK = 0
}
// default IIP header values
const DEFAULT_HEADER: IHeaderFields = {
@@ -41,8 +44,8 @@ export class IIPHandler implements IOscHandler, IResetHandler {
private readonly _coreTerminal: ITerminalExt
) {
const maxEncodedBytes = Math.ceil(this._opts.iipSizeLimit * 4 / 3);
const initialBytes = Math.min(INITIAL_DATA, maxEncodedBytes);
this._dec = new Base64Decoder(KEEP_DATA, maxEncodedBytes, initialBytes);
const initialBytes = Math.min(DecoderConst.INITIAL_DATA, maxEncodedBytes);
this._dec = new Base64Decoder(DecoderConst.KEEP_DATA, maxEncodedBytes, initialBytes);
}
public reset(): void {}
@@ -58,7 +61,7 @@ export class IIPHandler implements IOscHandler, IResetHandler {
if (this._aborted) return;
if (this._hp.state === HeaderState.END) {
if (this._dec.put(data.subarray(start, end)) !== DECODER_OK) {
if ((this._dec.put(data.subarray(start, end)) as number) !== DecoderConst.OK) {
this._dec.release();
this._aborted = true;
}
@@ -75,7 +78,7 @@ export class IIPHandler implements IOscHandler, IResetHandler {
return;
}
this._dec.init();
if (this._dec.put(data.subarray(dataPos, end)) !== DECODER_OK) {
if ((this._dec.put(data.subarray(dataPos, end)) as number) !== DecoderConst.OK) {
this._dec.release();
this._aborted = true;
}