ewasm: grow memory if needed

s1na · s1na · commit 9ad7df6557b3 · 2019-03-14T17:23:59.000+01:00
diff --git a/lib/ewasm/memory.js b/lib/ewasm/memory.js
@@ -4,6 +4,13 @@ module.exports = class Memory {
   }
 
   write (offset, length, value) {
+    // Grow if needed
+    if (this._raw.buffer.byteLength < length) {
+      const diff = length - this._raw.buffer.byteLength
+      const pageSize = 64 * 1024
+      this._raw.grow(Math.ceil(diff / pageSize))
+    }
+
     const m = new Uint8Array(this._raw.buffer, offset, length)
     m.set(value)
   }

Original file line number	Diff line number	Diff line change
`@@ -4,6 +4,13 @@ module.exports = class Memory {`
`4`	`4`	`}`
`5`	`5`
`6`	`6`	`write (offset, length, value) {`
	`7`	`+ // Grow if needed`
	`8`	`+ if (this._raw.buffer.byteLength < length) {`
	`9`	`+ const diff = length - this._raw.buffer.byteLength`
	`10`	`+ const pageSize = 64 * 1024`
	`11`	`+ this._raw.grow(Math.ceil(diff / pageSize))`
	`12`	`+ }`
	`13`	`+`
`7`	`14`	`const m = new Uint8Array(this._raw.buffer, offset, length)`
`8`	`15`	`m.set(value)`
`9`	`16`	`}`