New utils

kernel/bin/md5sum

@@ -0,0 +1,207 @@
+/* BARE_OS_BIN_API 1.0.0 — bump when staged /bin script semantics change (see developer guide). */
+/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
+function bareStdin(ctx) {
+  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
+}
+
+/** @param {number} mode @param {'file' | 'directory' | 'symlink'} type */
+function bareFormatModeString(mode, type) {
+  const typeChar = type === 'directory' ? 'd' : type === 'symlink' ? 'l' : '-'
+  const perm = mode & 0o777
+  const r = (bit) => (perm & bit ? 'r' : '-')
+  const w = (bit) => (perm & bit ? 'w' : '-')
+  const x = (bit) => (perm & bit ? 'x' : '-')
+  return (
+    typeChar +
+    r(0o400) +
+    w(0o200) +
+    x(0o100) +
+    r(0o040) +
+    w(0o020) +
+    x(0o010) +
+    r(0o004) +
+    w(0o002) +
+    x(0o001)
+  )
+}
+
+/** @param {number} mtimeMs @param {number} [nowMs] */
+function bareFormatLsMtime(mtimeMs, nowMs) {
+  const now = nowMs != null ? nowMs : Date.now()
+  const d = new Date(mtimeMs)
+  const months = [
+    'Jan',
+    'Feb',
+    'Mar',
+    'Apr',
+    'May',
+    'Jun',
+    'Jul',
+    'Aug',
+    'Sep',
+    'Oct',
+    'Nov',
+    'Dec'
+  ]
+  const mon = months[d.getMonth()]
+  const day = String(d.getDate()).padStart(2, ' ')
+  const sixMo = 180 * 24 * 3600 * 1000
+  if (Math.abs(now - mtimeMs) > sixMo) {
+    const yr = String(d.getFullYear()).padStart(4, ' ')
+    return mon + ' ' + day + '  ' + yr
+  }
+  const hh = String(d.getHours()).padStart(2, '0')
+  const mm = String(d.getMinutes()).padStart(2, '0')
+  return mon + ' ' + day + ' ' + hh + ':' + mm
+}
+
+/** @param {number} size */
+function barePosixBlocks(size) {
+  return Math.ceil(Number(size) / 512) || 0
+}
+
+/**
+ * Raw stdout for NUL/binary when **`process.stdout.write`** is missing.
+ * If **`ctx.bareOsBinWrite(Uint8Array|string)`** is set (tests / host), use it.
+ * @param {Record<string, unknown>} ctx
+ * @param {string | Uint8Array} chunk
+ * @returns {boolean}
+ */
+function bareOsEmitRaw(ctx, chunk) {
+  if (typeof ctx.bareOsBinWrite === 'function') {
+    const b4 = ctx.b4a
+    const u8 =
+      typeof chunk === 'string'
+        ? b4 && typeof b4.from === 'function'
+          ? b4.from(chunk)
+          : new TextEncoder().encode(chunk)
+        : chunk
+    ctx.bareOsBinWrite(u8 instanceof Uint8Array ? u8 : new Uint8Array(u8))
+    return true
+  }
+  const w = globalThis.process?.stdout?.write
+  if (typeof w === 'function') {
+    w.call(globalThis.process.stdout, chunk)
+    return true
+  }
+  return false
+}
+
+/** RFC 1321 MD5 — no Web Crypto; used by md5sum. */
+function bareMd5DigestBytes(u8) {
+  const n = u8.length
+  const bitLen = (BigInt(n) * 8n) & 0xffffffffffffffffn
+  const padLen = (56 - ((n + 1) % 64) + 64) % 64
+  const total = n + 1 + padLen + 8
+  const buf = new Uint8Array(total)
+  buf.set(u8)
+  buf[n] = 0x80
+  const view = new DataView(buf.buffer)
+  view.setUint32(total - 8, Number(bitLen & 0xffffffffn), true)
+  view.setUint32(total - 4, Number((bitLen >> 32n) & 0xffffffffn), true)
+
+  let a0 = 0x67452301
+  let b0 = 0xefcdab89
+  let c0 = 0x98badcfe
+  let d0 = 0x10325476
+  const s = [
+    7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5, 9,
+    14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
+    4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
+  ]
+  const K = new Uint32Array(64)
+  for (let i = 0; i < 64; i++) K[i] = Math.floor(Math.abs(Math.sin(i + 1)) * 0x100000000) >>> 0
+
+  const leftRotate = (x, c) => ((x << c) | (x >>> (32 - c))) >>> 0
+  for (let off = 0; off < total; off += 64) {
+    const M = new Uint32Array(16)
+    for (let i = 0; i < 16; i++) {
+      M[i] = view.getUint32(off + i * 4, true)
+    }
+    let A = a0
+    let B = b0
+    let C = c0
+    let D = d0
+    for (let i = 0; i < 64; i++) {
+      let F, g
+      if (i < 16) {
+        F = (B & C) | (~B & D)
+        g = i
+      } else if (i < 32) {
+        F = (D & B) | (~D & C)
+        g = (5 * i + 1) % 16
+      } else if (i < 48) {
+        F = B ^ C ^ D
+        g = (3 * i + 5) % 16
+      } else {
+        F = C ^ (B | ~D)
+        g = (7 * i) % 16
+      }
+      F = (F + A + K[i] + M[g]) >>> 0
+      A = D
+      D = C
+      C = B
+      B = (B + leftRotate(F, s[i])) >>> 0
+    }
+    a0 = (a0 + A) >>> 0
+    b0 = (b0 + B) >>> 0
+    c0 = (c0 + C) >>> 0
+    d0 = (d0 + D) >>> 0
+  }
+  const out = new Uint8Array(16)
+  const dv = new DataView(out.buffer)
+  dv.setUint32(0, a0, true)
+  dv.setUint32(4, b0, true)
+  dv.setUint32(8, c0, true)
+  dv.setUint32(12, d0, true)
+  return [...out].map((b) => b.toString(16).padStart(2, '0')).join('')
+}
+
+async function run(ctx, argv) {
+  const paths = []
+  for (let i = 1; i < argv.length; i++) {
+    const a = argv[i]
+    if (a === '-h' || a === '--help') {
+      ctx.console.log(
+        'usage: md5sum [FILE]...\n' +
+          'With no FILE, or when FILE is -, read standard input. Uses bundled MD5 (no Web Crypto MD5).'
+      )
+      ctx.exitCode = 0
+      return
+    }
+    if (a.startsWith('-') && a !== '-') {
+      ctx.console.error('md5sum: unsupported option ' + a)
+      ctx.exitCode = 1
+      return
+    }
+    paths.push(a)
+  }
+  const b4 = ctx.b4a
+  function one(name, buf) {
+    const u8 = buf instanceof Uint8Array ? buf : new Uint8Array(buf)
+    try {
+      const hex = bareMd5DigestBytes(u8)
+      ctx.console.log(hex + '  ' + name)
+    } catch (e) {
+      ctx.console.error('md5sum: ' + (e.message || e))
+      ctx.exitCode = 1
+    }
+  }
+  if (!paths.length || (paths.length === 1 && paths[0] === '-')) {
+    one('-', b4.from(bareStdin(ctx)))
+    return
+  }
+  for (const p of paths) {
+    if (p === '-') {
+      one('-', b4.from(bareStdin(ctx)))
+      continue
+    }
+    const b = await ctx.vfs.readFile(p)
+    if (!b) {
+      ctx.console.error('md5sum: ' + p + ': No such file')
+      ctx.exitCode = 1
+      continue
+    }
+    one(p, b)
+  }
+}