transfer list and notification

1 files changed, 95 insertions, 0 deletions

diff --git a/crock.ts b/crock.ts
new file mode 100644
index 0000000..2431eb6
--- /dev/null
+++ b/crock.ts
@@ -0,0 +1,95 @@
+function getValue(chr: string): number {
+  let a = chr;
+  switch (chr) {
+    case "O":
+    case "o":
+      a = "0;";
+      break;
+    case "i":
+    case "I":
+    case "l":
+    case "L":
+      a = "1";
+      break;
+    case "u":
+    case "U":
+      a = "V";
+  }
+
+  if (a >= "0" && a <= "9") {
+    return a.charCodeAt(0) - "0".charCodeAt(0);
+  }
+
+  if (a >= "a" && a <= "z") a = a.toUpperCase();
+  let dec = 0;
+  if (a >= "A" && a <= "Z") {
+    if ("I" < a) dec++;
+    if ("L" < a) dec++;
+    if ("O" < a) dec++;
+    if ("U" < a) dec++;
+    return a.charCodeAt(0) - "A".charCodeAt(0) + 10 - dec;
+  }
+  throw new Error('encoding');
+}
+
+const encTable = "0123456789ABCDEFGHJKMNPQRSTVWXYZ";
+export function encodeCrock(data: ArrayBuffer): string {
+  const dataBytes = new Uint8Array(data);
+  let sb = "";
+  const size = data.byteLength;
+  let bitBuf = 0;
+  let numBits = 0;
+  let pos = 0;
+  while (pos < size || numBits > 0) {
+    if (pos < size && numBits < 5) {
+      const d = dataBytes[pos++];
+      bitBuf = (bitBuf << 8) | d;
+      numBits += 8;
+    }
+    if (numBits < 5) {
+      // zero-padding
+      bitBuf = bitBuf << (5 - numBits);
+      numBits = 5;
+    }
+    const v = (bitBuf >>> (numBits - 5)) & 31;
+    sb += encTable[v];
+    numBits -= 5;
+  }
+  return sb;
+}
+
+export function decodeCrock(encoded: string): Uint8Array {
+  const size = encoded.length;
+  let bitpos = 0;
+  let bitbuf = 0;
+  let readPosition = 0;
+  const outLen = Math.floor((size * 5) / 8);
+  const out = new Uint8Array(outLen);
+  let outPos = 0;
+
+  while (readPosition < size || bitpos > 0) {
+    if (readPosition < size) {
+      const v = getValue(encoded[readPosition++]);
+      bitbuf = (bitbuf << 5) | v;
+      bitpos += 5;
+    }
+    while (bitpos >= 8) {
+      const d = (bitbuf >>> (bitpos - 8)) & 0xff;
+      out[outPos++] = d;
+      bitpos -= 8;
+    }
+    if (readPosition == size && bitpos > 0) {
+      bitbuf = (bitbuf << (8 - bitpos)) & 0xff;
+      bitpos = bitbuf == 0 ? 0 : 8;
+    }
+  }
+  return out;
+}
+
+const bin = decodeCrock("PV2D1G85528VDSZGED8KE98FEXT3PWQ99WV590TNVKJKM3GM3GRG")
+const base64String = Buffer
+  .from(String.fromCharCode.apply(null, bin))
+  .toString('base64');
+
+console.log(base64String)
+