From e72d372308679155295a9d12c103b0cfddf350e8 Mon Sep 17 00:00:00 2001
From: jin <jin@hyoo.ru>
Date: Sun, 29 Oct 2023 22:37:44 +0300
Subject: [PATCH] $mol_buffer - extended DataView

---
 buffer/buffer.ts | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 buffer/buffer.ts

diff --git a/buffer/buffer.ts b/buffer/buffer.ts
new file mode 100644
index 00000000000..de9d5347adb
--- /dev/null
+++ b/buffer/buffer.ts
@@ -0,0 +1,85 @@
+namespace $ {
+	export class $mol_buffer extends DataView {
+		
+		static toString() {
+			return $$.$mol_func_name( this )
+		}
+
+		getUint48( offset: number, LE = false ) {
+			if( offset % 4 ) {
+				return this.getUint16( offset, LE ) + this.getUint32( offset + 2, LE ) * 2**16
+			} else {
+				return this.getUint32( offset, LE ) + this.getUint16( offset + 4, LE ) * 2**32
+			}
+		}
+		
+		setUint48( offset: number, value: number, LE = false ) {
+			if( offset % 4 ) {
+				this.setUint16( offset, value & ( (1<<16) - 1 ), LE )
+				this.setUint32( offset + 2, ( value / 2**16 )|0, LE )
+			} else {
+				this.setUint32( offset, value |0, LE )
+				this.setUint16( offset + 4, ( value / 2**32 )|0, LE )
+			}
+		}
+		
+		int8( offset: number, next?: number ) {
+			if( next === undefined ) return this.getInt8( offset )
+			if( next >= -(2**7) && next < 2**7 ) return this.setInt8( offset, next ), next
+			$mol_fail( new Error( `Wrong int8 value ${ next }` ) )
+		}
+		
+		uint8( offset: number, next?: number ) {
+			if( next === undefined ) return this.getUint8( offset )
+			if( next >= 0 && next < 2**8 ) return this.setUint8( offset, next ), next
+			$mol_fail( new Error( `Wrong uint8 value ${ next }` ) )
+		}
+		
+		int16( offset: number, next?: number ) {
+			if( next === undefined ) return this.getInt16( offset, !!'LE' )
+			if( next >= -(2**15) && next < 2**15 ) return this.setInt16( offset, next, !!'LE' ), next
+			$mol_fail( new Error( `Wrong int16 value ${ next }` ) )
+		}
+		
+		uint16( offset: number, next?: number ) {
+			if( next === undefined ) return this.getUint16( offset, !!'LE' )
+			if( next >= 0 && next < 2**16 ) return this.setUint16( offset, next, !!'LE' ), next
+			$mol_fail( new Error( `Wrong uint16 value ${ next }` ) )
+		}
+		
+		int32( offset: number, next?: number ) {
+			if( next === undefined ) return this.getInt32( offset, !!'LE' )
+			if( next >= -(2**31) && next < 2**31 ) return this.setInt32( offset, next, !!'LE' ), next
+			$mol_fail( new Error( `Wrong int32 value ${ next }` ) )
+		}
+	
+		uint32( offset: number, next?: number ) {
+			if( next === undefined ) return this.getUint32( offset, !!'LE' )
+			if( next >= 0 && next < 2**32 ) return this.setUint32( offset, next, !!'LE' ), next
+			$mol_fail( new Error( `Wrong uint32 value ${ next }` ) )
+		}
+		
+		uint48( offset: number, next?: number ) {
+			if( next === undefined ) return this.getUint48( offset, !!'LE' )
+			if( next >= 0 && next < 2**48 ) return this.setUint48( offset, next, !!'LE' ), next
+			$mol_fail( new Error( `Wrong uint48 value ${ next }` ) )
+		}
+		
+		int64( offset: number, next?: bigint ) {
+			if( next === undefined ) return this.getBigInt64( offset, !!'LE' )
+			if( next >= -(2**63) && next < 2**63 ) return this.setBigInt64( offset, next, !!'LE' ), next
+			$mol_fail( new Error( `Wrong int64 value ${ next }` ) )
+		}
+		
+		uint64( offset: number, next?: bigint ) {
+			if( next === undefined ) return this.getBigUint64( offset, !!'LE' )
+			if( next >= 0 && next < 2**64 ) return this.setBigUint64( offset, next, !!'LE' ), next
+			$mol_fail( new Error( `Wrong uint64 value ${ next }` ) )
+		}
+		
+		asArray() {
+			return new Uint8Array( this.buffer, this.byteOffset, this.byteLength )
+		}
+		
+	}
+}