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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// Interfaces 100% copied from Go.// Documentation liberally lifted from them too.// Thank you! We love Go! <3"use strict";
((window) => {  const core = window.Deno.core;  const ops = core.ops;  const {    Uint8Array,    ArrayPrototypePush,    MathMin,    TypedArrayPrototypeSubarray,    TypedArrayPrototypeSet,  } = window.__bootstrap.primordials;
  const DEFAULT_BUFFER_SIZE = 32 * 1024;  // Seek whence values.  // https://golang.org/pkg/io/#pkg-constants  const SeekMode = {    0: "Start",    1: "Current",    2: "End",
    Start: 0,    Current: 1,    End: 2,  };
  async function copy(    src,    dst,    options,  ) {    let n = 0;    const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;    const b = new Uint8Array(bufSize);    let gotEOF = false;    while (gotEOF === false) {      const result = await src.read(b);      if (result === null) {        gotEOF = true;      } else {        let nwritten = 0;        while (nwritten < result) {          nwritten += await dst.write(            TypedArrayPrototypeSubarray(b, nwritten, result),          );        }        n += nwritten;      }    }    return n;  }
  async function* iter(    r,    options,  ) {    const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;    const b = new Uint8Array(bufSize);    while (true) {      const result = await r.read(b);      if (result === null) {        break;      }
      yield TypedArrayPrototypeSubarray(b, 0, result);    }  }
  function* iterSync(    r,    options,  ) {    const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;    const b = new Uint8Array(bufSize);    while (true) {      const result = r.readSync(b);      if (result === null) {        break;      }
      yield TypedArrayPrototypeSubarray(b, 0, result);    }  }
  function readSync(rid, buffer) {    if (buffer.length === 0) {      return 0;    }
    const nread = ops.op_read_sync(rid, buffer);
    return nread === 0 ? null : nread;  }
  async function read(rid, buffer) {    if (buffer.length === 0) {      return 0;    }
    const nread = await core.read(rid, buffer);
    return nread === 0 ? null : nread;  }
  function writeSync(rid, data) {    return ops.op_write_sync(rid, data);  }
  function write(rid, data) {    return core.write(rid, data);  }
  const READ_PER_ITER = 64 * 1024; // 64kb
  function readAll(r) {    return readAllInner(r);  }  async function readAllInner(r, options) {    const buffers = [];    const signal = options?.signal ?? null;    while (true) {      signal?.throwIfAborted();      const buf = new Uint8Array(READ_PER_ITER);      const read = await r.read(buf);      if (typeof read == "number") {        ArrayPrototypePush(buffers, new Uint8Array(buf.buffer, 0, read));      } else {        break;      }    }    signal?.throwIfAborted();
    return concatBuffers(buffers);  }
  function readAllSync(r) {    const buffers = [];
    while (true) {      const buf = new Uint8Array(READ_PER_ITER);      const read = r.readSync(buf);      if (typeof read == "number") {        ArrayPrototypePush(buffers, TypedArrayPrototypeSubarray(buf, 0, read));      } else {        break;      }    }
    return concatBuffers(buffers);  }
  function concatBuffers(buffers) {    let totalLen = 0;    for (const buf of buffers) {      totalLen += buf.byteLength;    }
    const contents = new Uint8Array(totalLen);
    let n = 0;    for (const buf of buffers) {      TypedArrayPrototypeSet(contents, buf, n);      n += buf.byteLength;    }
    return contents;  }
  function readAllSyncSized(r, size) {    const buf = new Uint8Array(size + 1); // 1B to detect extended files    let cursor = 0;
    while (cursor < size) {      const sliceEnd = MathMin(size + 1, cursor + READ_PER_ITER);      const slice = TypedArrayPrototypeSubarray(buf, cursor, sliceEnd);      const read = r.readSync(slice);      if (typeof read == "number") {        cursor += read;      } else {        break;      }    }
    // Handle truncated or extended files during read    if (cursor > size) {      // Read remaining and concat      return concatBuffers([buf, readAllSync(r)]);    } else { // cursor == size      return TypedArrayPrototypeSubarray(buf, 0, cursor);    }  }
  async function readAllInnerSized(r, size, options) {    const buf = new Uint8Array(size + 1); // 1B to detect extended files    let cursor = 0;    const signal = options?.signal ?? null;    while (cursor < size) {      signal?.throwIfAborted();      const sliceEnd = MathMin(size + 1, cursor + READ_PER_ITER);      const slice = TypedArrayPrototypeSubarray(buf, cursor, sliceEnd);      const read = await r.read(slice);      if (typeof read == "number") {        cursor += read;      } else {        break;      }    }    signal?.throwIfAborted();
    // Handle truncated or extended files during read    if (cursor > size) {      // Read remaining and concat      return concatBuffers([buf, await readAllInner(r, options)]);    } else {      return TypedArrayPrototypeSubarray(buf, 0, cursor);    }  }
  window.__bootstrap.io = {    iterSync,    iter,    copy,    SeekMode,    read,    readSync,    write,    writeSync,    readAll,    readAllInner,    readAllSync,    readAllSyncSized,    readAllInnerSized,  };})(this);