open source Notesnook API

2022-12-28 16:20:25 +05:00
parent cf406454cd
commit d2217adce7
85 changed files with 4137 additions and 0 deletions
@@ -0,0 +1,72 @@
+using System.IO;
+using System.IO.Compression;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace System
+{
+    public static class StringExtensions
+    {
+        public static string ToSha256(this string rawData, int maxLength = 12)
+        {
+            // Create a SHA256   
+            using (SHA256 sha256Hash = SHA256.Create())
+            {
+                // ComputeHash - returns byte array  
+                byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));
+                return ToHex(bytes, 0, maxLength);
+            }
+        }
+
+        public static byte[] CompressBrotli(this string input)
+        {
+            var raw = Encoding.Default.GetBytes(input);
+            using (MemoryStream memory = new MemoryStream())
+            {
+                using (BrotliStream brotli = new BrotliStream(memory, CompressionLevel.Optimal))
+                {
+                    brotli.Write(raw, 0, raw.Length);
+                }
+                return memory.ToArray();
+            }
+        }
+
+        public static string DecompressBrotli(this byte[] compressed)
+        {
+            using (BrotliStream stream = new BrotliStream(new MemoryStream(compressed), CompressionMode.Decompress))
+            {
+                const int size = 4096;
+                byte[] buffer = new byte[size];
+                using (MemoryStream memory = new MemoryStream())
+                {
+                    int count = 0;
+                    do
+                    {
+                        count = stream.Read(buffer, 0, size);
+                        if (count > 0)
+                        {
+                            memory.Write(buffer, 0, count);
+                        }
+                    }
+                    while (count > 0);
+                    return Encoding.Default.GetString(memory.ToArray());
+                }
+            }
+        }
+
+        private static string ToHex(byte[] bytes, int startIndex, int length)
+        {
+            char[] c = new char[length * 2];
+            byte b;
+            for (int bx = startIndex, cx = startIndex; bx < length; ++bx, ++cx)
+            {
+                b = ((byte)(bytes[bx] >> 4));
+                c[cx] = (char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);
+
+                b = ((byte)(bytes[bx] & 0x0F));
+                c[++cx] = (char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);
+            }
+            return new string(c);
+        }
+    }
+}