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opencode v2 mirror
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12345678910111213141516171819202122232425262728293031323334353637383940export function base64Encode(value: string) { const bytes = new TextEncoder().encode(value) const binary = Array.from(bytes, (byte) => String.fromCharCode(byte)).join("") return btoa(binary).replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "")}
export function base64Decode(value: string) { const binary = atob(value.replace(/-/g, "+").replace(/_/g, "/")) return new TextDecoder().decode(Uint8Array.from(binary, (character) => character.charCodeAt(0)))}
export function checksum(content: string): string | undefined { if (!content) return let hash = 0x811c9dc5 for (let index = 0; index < content.length; index++) { hash ^= content.charCodeAt(index) hash = Math.imul(hash, 0x01000193) } return (hash >>> 0).toString(36)}
export function sampledChecksum(content: string, limit = 500_000): string | undefined { if (!content) return if (content.length <= limit) return checksum(content)
const size = 4096 return `${content.length}:${[ 0, Math.floor(content.length * 0.25), Math.floor(content.length * 0.5), Math.floor(content.length * 0.75), content.length - size, ] .map((point) => { const start = Math.max(0, Math.min(content.length - size, point - Math.floor(size / 2))) return checksum(content.slice(start, start + size)) ?? "" }) .join(":")}`}