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1 files changed, 122 insertions, 0 deletions

diff --git a/node_modules/mdurl/decode.js b/node_modules/mdurl/decode.js
new file mode 100644
index 00000000..189d7b9c
--- /dev/null
+++ b/node_modules/mdurl/decode.js
@@ -0,0 +1,122 @@
+
+'use strict';
+
+
+/* eslint-disable no-bitwise */
+
+var decodeCache = {};
+
+function getDecodeCache(exclude) {
+  var i, ch, cache = decodeCache[exclude];
+  if (cache) { return cache; }
+
+  cache = decodeCache[exclude] = [];
+
+  for (i = 0; i < 128; i++) {
+    ch = String.fromCharCode(i);
+    cache.push(ch);
+  }
+
+  for (i = 0; i < exclude.length; i++) {
+    ch = exclude.charCodeAt(i);
+    cache[ch] = '%' + ('0' + ch.toString(16).toUpperCase()).slice(-2);
+  }
+
+  return cache;
+}
+
+
+// Decode percent-encoded string.
+//
+function decode(string, exclude) {
+  var cache;
+
+  if (typeof exclude !== 'string') {
+    exclude = decode.defaultChars;
+  }
+
+  cache = getDecodeCache(exclude);
+
+  return string.replace(/(%[a-f0-9]{2})+/gi, function(seq) {
+    var i, l, b1, b2, b3, b4, chr,
+        result = '';
+
+    for (i = 0, l = seq.length; i < l; i += 3) {
+      b1 = parseInt(seq.slice(i + 1, i + 3), 16);
+
+      if (b1 < 0x80) {
+        result += cache[b1];
+        continue;
+      }
+
+      if ((b1 & 0xE0) === 0xC0 && (i + 3 < l)) {
+        // 110xxxxx 10xxxxxx
+        b2 = parseInt(seq.slice(i + 4, i + 6), 16);
+
+        if ((b2 & 0xC0) === 0x80) {
+          chr = ((b1 << 6) & 0x7C0) | (b2 & 0x3F);
+
+          if (chr < 0x80) {
+            result += '\ufffd\ufffd';
+          } else {
+            result += String.fromCharCode(chr);
+          }
+
+          i += 3;
+          continue;
+        }
+      }
+
+      if ((b1 & 0xF0) === 0xE0 && (i + 6 < l)) {
+        // 1110xxxx 10xxxxxx 10xxxxxx
+        b2 = parseInt(seq.slice(i + 4, i + 6), 16);
+        b3 = parseInt(seq.slice(i + 7, i + 9), 16);
+
+        if ((b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80) {
+          chr = ((b1 << 12) & 0xF000) | ((b2 << 6) & 0xFC0) | (b3 & 0x3F);
+
+          if (chr < 0x800 || (chr >= 0xD800 && chr <= 0xDFFF)) {
+            result += '\ufffd\ufffd\ufffd';
+          } else {
+            result += String.fromCharCode(chr);
+          }
+
+          i += 6;
+          continue;
+        }
+      }
+
+      if ((b1 & 0xF8) === 0xF0 && (i + 9 < l)) {
+        // 111110xx 10xxxxxx 10xxxxxx 10xxxxxx
+        b2 = parseInt(seq.slice(i + 4, i + 6), 16);
+        b3 = parseInt(seq.slice(i + 7, i + 9), 16);
+        b4 = parseInt(seq.slice(i + 10, i + 12), 16);
+
+        if ((b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80 && (b4 & 0xC0) === 0x80) {
+          chr = ((b1 << 18) & 0x1C0000) | ((b2 << 12) & 0x3F000) | ((b3 << 6) & 0xFC0) | (b4 & 0x3F);
+
+          if (chr < 0x10000 || chr > 0x10FFFF) {
+            result += '\ufffd\ufffd\ufffd\ufffd';
+          } else {
+            chr -= 0x10000;
+            result += String.fromCharCode(0xD800 + (chr >> 10), 0xDC00 + (chr & 0x3FF));
+          }
+
+          i += 9;
+          continue;
+        }
+      }
+
+      result += '\ufffd';
+    }
+
+    return result;
+  });
+}
+
+
+decode.defaultChars   = ';/?:@&=+$,#';
+decode.componentChars = '';
+
+
+module.exports = decode;