Initial commit (by create-cloudflare CLI)

1 files changed, 67 insertions, 0 deletions

diff --git a/node_modules/capnp-ts/src/serialization/arena/single-segment-arena.ts b/node_modules/capnp-ts/src/serialization/arena/single-segment-arena.ts
new file mode 100644
index 0000000..250568c
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+++ b/node_modules/capnp-ts/src/serialization/arena/single-segment-arena.ts
@@ -0,0 +1,67 @@
+/**
+ * @author jdiaz5513
+ */
+
+import initTrace from "debug";
+import { DEFAULT_BUFFER_SIZE, MIN_SINGLE_SEGMENT_GROWTH } from "../../constants";
+import { SEG_GET_NON_ZERO_SINGLE, SEG_NOT_WORD_ALIGNED } from "../../errors";
+import { format, padToWord } from "../../util";
+import { Segment } from "../segment";
+import { ArenaAllocationResult } from "./arena-allocation-result";
+import { ArenaKind } from "./arena-kind";
+
+const trace = initTrace("capnp:arena:single");
+trace("load");
+
+export class SingleSegmentArena {
+  static readonly allocate = allocate;
+  static readonly getBuffer = getBuffer;
+  static readonly getNumSegments = getNumSegments;
+
+  buffer: ArrayBuffer;
+  readonly kind = ArenaKind.SINGLE_SEGMENT;
+
+  constructor(buffer = new ArrayBuffer(DEFAULT_BUFFER_SIZE)) {
+    if ((buffer.byteLength & 7) !== 0) {
+      throw new Error(format(SEG_NOT_WORD_ALIGNED, buffer.byteLength));
+    }
+
+    this.buffer = buffer;
+
+    trace("new %s", this);
+  }
+
+  toString(): string {
+    return format("SingleSegmentArena_len:%x", this.buffer.byteLength);
+  }
+}
+
+export function allocate(minSize: number, segments: Segment[], s: SingleSegmentArena): ArenaAllocationResult {
+  trace("Allocating %x bytes for segment 0 in %s.", minSize, s);
+
+  const srcBuffer = segments.length > 0 ? segments[0].buffer : s.buffer;
+
+  if (minSize < MIN_SINGLE_SEGMENT_GROWTH) {
+    minSize = MIN_SINGLE_SEGMENT_GROWTH;
+  } else {
+    minSize = padToWord(minSize);
+  }
+
+  s.buffer = new ArrayBuffer(srcBuffer.byteLength + minSize);
+
+  // PERF: Assume that the source and destination buffers are word-aligned and use Float64Array to copy them one word
+  // at a time.
+  new Float64Array(s.buffer).set(new Float64Array(srcBuffer));
+
+  return new ArenaAllocationResult(0, s.buffer);
+}
+
+export function getBuffer(id: number, s: SingleSegmentArena): ArrayBuffer {
+  if (id !== 0) throw new Error(format(SEG_GET_NON_ZERO_SINGLE, id));
+
+  return s.buffer;
+}
+
+export function getNumSegments(): number {
+  return 1;
+}