Function parseResourceState

packages/core/src/__tests__/drawlistDecode.ts:132–202

(bytes: Uint8Array)

}

function parseResourceState(bytes: Uint8Array): ResourceState {
  const headers = parseCommandHeaders(bytes);
  const strings = new Map<number, Uint8Array>();
  const blobs = new Map<number, Uint8Array>();

  for (const cmd of headers) {
    switch (cmd.opcode) {
      case OP_DEF_STRING: {
        if (cmd.size < 16) {
          throw new Error(
            `DEF_STRING too small at offset ${String(cmd.offset)} size=${String(cmd.size)}`,
          );
        }
        const id = u32(bytes, cmd.offset + 8);
        const byteLen = u32(bytes, cmd.offset + 12);
        const dataStart = cmd.offset + 16;
        const dataEnd = dataStart + byteLen;
        if (dataEnd > cmd.offset + cmd.size) {
          throw new Error(
            `DEF_STRING payload overflow at offset ${String(cmd.offset)} (len=${String(byteLen)}, size=${String(cmd.size)})`,
          );
        }
        strings.set(id, cloneBytes(bytes.subarray(dataStart, dataEnd)));
        break;
      }
      case OP_FREE_STRING: {
        if (cmd.size !== 12) {
          throw new Error(
            `FREE_STRING wrong size at offset ${String(cmd.offset)} size=${String(cmd.size)}`,
          );
        }
        strings.delete(u32(bytes, cmd.offset + 8));
        break;
      }
      case OP_DEF_BLOB: {
        if (cmd.size < 16) {
          throw new Error(
            `DEF_BLOB too small at offset ${String(cmd.offset)} size=${String(cmd.size)}`,
          );
        }
        const id = u32(bytes, cmd.offset + 8);
        const byteLen = u32(bytes, cmd.offset + 12);
        const dataStart = cmd.offset + 16;
        const dataEnd = dataStart + byteLen;
        if (dataEnd > cmd.offset + cmd.size) {
          throw new Error(
            `DEF_BLOB payload overflow at offset ${String(cmd.offset)} (len=${String(byteLen)}, size=${String(cmd.size)})`,
          );
        }
        blobs.set(id, cloneBytes(bytes.subarray(dataStart, dataEnd)));
        break;
      }
      case OP_FREE_BLOB: {
        if (cmd.size !== 12) {
          throw new Error(
            `FREE_BLOB wrong size at offset ${String(cmd.offset)} size=${String(cmd.size)}`,
          );
        }