From 7bcee674c8fb89d9d5505c0af46c74323ca95569 Mon Sep 17 00:00:00 2001
From: Alexander Rose <alex.rose@rcsb.org>
Date: Wed, 20 Feb 2019 16:38:08 -0800
Subject: [PATCH] added SimpleBuffer to wrap DataView and node's Buffer
---
src/mol-io/common/simple-buffer.ts | 94 ++++++++++++++++++++++++++++++
1 file changed, 94 insertions(+)
create mode 100644 src/mol-io/common/simple-buffer.ts
diff --git a/src/mol-io/common/simple-buffer.ts b/src/mol-io/common/simple-buffer.ts
new file mode 100644
index 000000000..45f4d85d5
--- /dev/null
+++ b/src/mol-io/common/simple-buffer.ts
@@ -0,0 +1,94 @@
+/**
+ * Copyright (c) 2019 mol* contributors, licensed under MIT, See LICENSE file for more info.
+ *
+ * @author Alexander Rose <alexander.rose@weirdbyte.de>
+ */
+
+export interface SimpleBuffer extends Uint8Array {
+ readInt8: (offset: number) => number
+ readUInt8: (offset: number) => number
+
+ writeInt8: (value: number, offset: number) => void
+ writeUInt8: (value: number, offset: number) => void
+
+ readInt16LE: (offset: number) => number
+ readInt32LE: (offset: number) => number
+ readUInt16LE: (offset: number) => number
+ readUInt32LE: (offset: number) => number
+ readFloatLE: (offset: number) => number
+ readDoubleLE: (offset: number) => number
+
+ writeInt16LE: (value: number, offset: number) => void
+ writeInt32LE: (value: number, offset: number) => void
+ writeUInt16LE: (value: number, offset: number) => void
+ writeUInt32LE: (value: number, offset: number) => void
+ writeFloatLE: (value: number, offset: number) => void
+ writeDoubleLE: (value: number, offset: number) => void
+
+ readInt16BE: (offset: number) => number
+ readInt32BE: (offset: number) => number
+ readUInt16BE: (offset: number) => number
+ readUInt32BE: (offset: number) => number
+ readFloatBE: (offset: number) => number
+ readDoubleBE: (offset: number) => number
+
+ writeInt16BE: (value: number, offset: number) => void
+ writeInt32BE: (value: number, offset: number) => void
+ writeUInt16BE: (value: number, offset: number) => void
+ writeUInt32BE: (value: number, offset: number) => void
+ writeFloatBE: (value: number, offset: number) => void
+ writeDoubleBE: (value: number, offset: number) => void
+}
+
+export namespace SimpleBuffer {
+ export function fromUint8Array(array: Uint8Array): SimpleBuffer {
+ const dv = new DataView(array.buffer)
+ return Object.assign(array.subarray(0), {
+ readInt8: (offset: number) => dv.getInt8(offset),
+ readUInt8: (offset: number) => dv.getUint8(offset),
+ writeInt8: (value: number, offset: number) => dv.setInt8(offset, value),
+ writeUInt8: (value: number, offset: number) => dv.setUint8(offset, value),
+
+ readInt16LE: (offset: number) => dv.getInt16(offset, true),
+ readInt32LE: (offset: number) => dv.getInt32(offset, true),
+ readUInt16LE: (offset: number) => dv.getUint16(offset, true),
+ readUInt32LE: (offset: number) => dv.getUint32(offset, true),
+ readFloatLE: (offset: number) => dv.getFloat32(offset, true),
+ readDoubleLE: (offset: number) => dv.getFloat64(offset, true),
+
+ writeInt16LE: (value: number, offset: number) => dv.setInt16(offset, value, true),
+ writeInt32LE: (value: number, offset: number) => dv.setInt32(offset, value, true),
+ writeUInt16LE: (value: number, offset: number) => dv.setUint16(offset, value, true),
+ writeUInt32LE: (value: number, offset: number) => dv.setUint32(offset, value, true),
+ writeFloatLE: (value: number, offset: number) => dv.setFloat32(offset, value, true),
+ writeDoubleLE: (value: number, offset: number) => dv.setFloat64(offset, value, true),
+
+ readInt16BE: (offset: number) => dv.getInt16(offset, false),
+ readInt32BE: (offset: number) => dv.getInt32(offset, false),
+ readUInt16BE: (offset: number) => dv.getUint16(offset, false),
+ readUInt32BE: (offset: number) => dv.getUint32(offset, false),
+ readFloatBE: (offset: number) => dv.getFloat32(offset, false),
+ readDoubleBE: (offset: number) => dv.getFloat64(offset, false),
+
+ writeInt16BE: (value: number, offset: number) => dv.setInt16(offset, value, false),
+ writeInt32BE: (value: number, offset: number) => dv.setInt32(offset, value, false),
+ writeUInt16BE: (value: number, offset: number) => dv.setUint16(offset, value, false),
+ writeUInt32BE: (value: number, offset: number) => dv.setUint32(offset, value, false),
+ writeFloatBE: (value: number, offset: number) => dv.setFloat32(offset, value, false),
+ writeDoubleBE: (value: number, offset: number) => dv.setFloat64(offset, value, false),
+ })
+ }
+
+ export function fromBuffer(buffer: Buffer): SimpleBuffer {
+ return buffer
+ }
+
+ /** source and target can't be the same */
+ export function flipByteOrder(source: SimpleBuffer, target: Uint8Array, byteCount: number, elementByteSize: number, offset: number) {
+ for (let i = 0, n = byteCount; i < n; i += elementByteSize) {
+ for (let j = 0; j < elementByteSize; j++) {
+ target[offset + i + elementByteSize - j - 1] = source[offset + i + j];
+ }
+ }
+ }
+}
\ No newline at end of file
--
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