feat: 초기 프로젝트 설정 및 룰.md 파일 추가

api.hyungi.net/node_modules/js-git/lib/apply-delta.js

@@ -0,0 +1,61 @@
+var bodec = require('bodec');
+
+module.exports = applyDelta;
+
+function applyDelta(delta, base) {
+  var deltaOffset = 0;
+
+  if (base.length !== readLength()) {
+    throw new Error("Base length mismatch");
+  }
+
+  // Create a new output buffer with length from header.
+  var outOffset = 0;
+  var out = bodec.create(readLength());
+
+  while (deltaOffset < delta.length) {
+    var byte = delta[deltaOffset++];
+    // Copy command.  Tells us offset in base and length to copy.
+    if (byte & 0x80) {
+      var offset = 0;
+      var length = 0;
+      if (byte & 0x01) offset |= delta[deltaOffset++] << 0;
+      if (byte & 0x02) offset |= delta[deltaOffset++] << 8;
+      if (byte & 0x04) offset |= delta[deltaOffset++] << 16;
+      if (byte & 0x08) offset |= delta[deltaOffset++] << 24;
+      if (byte & 0x10) length |= delta[deltaOffset++] << 0;
+      if (byte & 0x20) length |= delta[deltaOffset++] << 8;
+      if (byte & 0x40) length |= delta[deltaOffset++] << 16;
+      if (length === 0) length = 0x10000;
+      // copy the data
+      bodec.copy(bodec.slice(base, offset, offset + length), out, outOffset);
+      outOffset += length;
+    }
+    // Insert command, opcode byte is length itself
+    else if (byte) {
+      bodec.copy(bodec.slice(delta, deltaOffset, deltaOffset + byte), out, outOffset);
+      deltaOffset += byte;
+      outOffset += byte;
+    }
+    else throw new Error('Invalid delta opcode');
+  }
+
+  if (outOffset !== out.length) {
+    throw new Error("Size mismatch in check");
+  }
+
+  return out;
+
+  // Read a variable length number our of delta and move the offset.
+  function readLength() {
+    var byte = delta[deltaOffset++];
+    var length = byte & 0x7f;
+    var shift = 7;
+    while (byte & 0x80) {
+      byte = delta[deltaOffset++];
+      length |= (byte & 0x7f) << shift;
+      shift += 7;
+    }
+    return length;
+  }
+}