cbor2/lib/float.js

Encode and parse data in the Concise Binary Object Representation (CBOR) data format (RFC8949).

function o(e,n=0,t=!1){const r=e[n]&128?-1:1,f=(e[n]&124)>>2,a=(e[n]&3)<<8|e[n+1];if(f===0){if(t&&a!==0)throw new Error(`Unwanted subnormal: ${r*5960464477539063e-23*a}`);return r*5960464477539063e-23*a}else if(f===31)return a?NaN:r*(1/0);return r*2**(f-25)*(1024+a)}function s(e){const n=new DataView(new ArrayBuffer(4));n.setFloat32(0,e,!1);const t=n.getUint32(0,!1);if((t&8191)!==0)return null;let r=t>>16&32768;const f=t>>23&255,a=t&8388607;if(!(f===0&&a===0))if(f>=113&&f<=142)r+=(f-112<<10)+(a>>13);else if(f>=103&&f<113){if(a&(1<<126-f)-1)return null;r+=a+8388608>>126-f}else if(f===255)r|=31744,r|=a>>13;else return null;return r}function i(e){if(e!==0){const n=new ArrayBuffer(8),t=new DataView(n);t.setFloat64(0,e,!1);const r=t.getBigUint64(0,!1);if((r&0x7ff0000000000000n)===0n)return r&0x8000000000000000n?-0:0}return e}function l(e){switch(e.length){case 2:o(e,0,!0);break;case 4:{const n=new DataView(e.buffer,e.byteOffset,e.byteLength),t=n.getUint32(0,!1);if((t&2139095040)===0&&t&8388607)throw new Error(`Unwanted subnormal: ${n.getFloat32(0,!1)}`);break}case 8:{const n=new DataView(e.buffer,e.byteOffset,e.byteLength),t=n.getBigUint64(0,!1);if((t&0x7ff0000000000000n)===0n&&t&0x000fffffffffffn)throw new Error(`Unwanted subnormal: ${n.getFloat64(0,!1)}`);break}default:throw new TypeError(`Bad input to isSubnormal: ${e}`)}}export{l as checkSubnormal,i as flushToZero,s as halfToUint,o as parseHalf};