sati-open/sati.n-api.index-file
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Read writer memory optimize

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Eli-Class
2026-02-05 05:36:36 +00:00
parent 132189da48
commit 92a2681292
8 changed files with 118 additions and 87 deletions
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40
lib/idx/protocol.ts
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@@ -73,39 +73,15 @@ export class IndexProtocol {
buf.writeUInt32LE(latestSequence, 36);
}
static writeEntry(buf: Buffer, index: number, entry: Omit<IndexEntry, 'checksum'>): void {
const off = INDEX_HEADER_SIZE + index * INDEX_ENTRY_SIZE;
static writeEntry(buf: Buffer, entry: Omit<IndexEntry, 'checksum'>): void {
buf.writeUInt32LE(entry.sequence, 0);
buf.writeBigUInt64LE(entry.timestamp, 4);
buf.writeBigUInt64LE(entry.offset, 12);
buf.writeUInt32LE(entry.length, 20);
buf.writeUInt32LE(entry.flags | FLAG_VALID, 24);
buf.writeUInt32LE(entry.sequence, off);
buf.writeBigUInt64LE(entry.timestamp, off + 4);
buf.writeBigUInt64LE(entry.offset, off + 12);
buf.writeUInt32LE(entry.length, off + 20);
buf.writeUInt32LE(entry.flags | FLAG_VALID, off + 24);
const checksum = crc32(buf, off, off + 28);
buf.writeUInt32LE(checksum, off + 28);
}
static readEntry(buf: Buffer, index: number): IndexEntry | null {
const off = INDEX_HEADER_SIZE + index * INDEX_ENTRY_SIZE;
const flags = buf.readUInt32LE(off + 24);
if (!(flags & FLAG_VALID)) return null;
return {
sequence: buf.readUInt32LE(off),
timestamp: buf.readBigUInt64LE(off + 4),
offset: buf.readBigUInt64LE(off + 12),
length: buf.readUInt32LE(off + 20),
flags,
checksum: buf.readUInt32LE(off + 28),
};
}
static isValidEntry(buf: Buffer, index: number): boolean {
const off = INDEX_HEADER_SIZE + index * INDEX_ENTRY_SIZE;
const flags = buf.readUInt32LE(off + 24);
return (flags & FLAG_VALID) !== 0;
const checksum = crc32(buf, 0, 28);
buf.writeUInt32LE(checksum, 28);
}
static calcFileSize(entryCount: number): number {