performance tuning for numeric tokens and parsing

src/UglyToad.PdfPig/IO/ByteArrayInputBytes.cs

@@ -7,6 +7,7 @@
 
     internal class ByteArrayInputBytes : IInputBytes
     {
+        private readonly int upperBound;
         private readonly byte[] bytes;
 
         [DebuggerStepThrough]
@@ -26,6 +27,8 @@
                 this.bytes = bytes.ToArray();
             }
 
+            upperBound = this.bytes.Length - 1;
+
             currentOffset = -1;
         }
 
@@ -34,20 +37,21 @@
         {
             this.bytes = bytes ?? throw new ArgumentNullException(nameof(bytes));
             currentOffset = -1;
+            upperBound = bytes.Length - 1;
         }
 
-        private long currentOffset;
+        private int currentOffset;
         public long CurrentOffset => currentOffset + 1;
 
         public bool MoveNext()
         {
-            if (currentOffset == bytes.Length - 1)
+            if (currentOffset == upperBound)
             {
                 return false;
             }
 
             currentOffset++;
-            CurrentByte = bytes[(int)currentOffset];
+            CurrentByte = bytes[currentOffset];
             return true;
         }
 
@@ -57,23 +61,23 @@
 
         public byte? Peek()
         {
-            if (currentOffset == bytes.Length - 1)
+            if (currentOffset == upperBound)
             {
                 return null;
             }
 
-            return bytes[(int)currentOffset + 1];
+            return bytes[currentOffset + 1];
         }
 
         public bool IsAtEnd()
         {
-            return currentOffset == bytes.Length - 1;
+            return currentOffset == upperBound;
         }
 
         public void Seek(long position)
         {
             currentOffset = (int)position - 1;
-            CurrentByte = currentOffset < 0 ? (byte)0 : bytes[(int)currentOffset];
+            CurrentByte = currentOffset < 0 ? (byte)0 : bytes[currentOffset];
         }
 
         public int Read(byte[] buffer, int? length = null)
@@ -100,8 +104,8 @@
             }
 
             var viableLength = (bytes.Length - currentOffset - 1);
-            var readLength = (int)(viableLength < bytesToRead ? viableLength : bytesToRead);
-            var startFrom = (int)currentOffset + 1;
+            var readLength = viableLength < bytesToRead ? viableLength : bytesToRead;
+            var startFrom = currentOffset + 1;
 
             Array.Copy(bytes, startFrom, buffer, 0, readLength);
             

src/UglyToad.PdfPig/Parser/Parts/ReadHelper.cs

@@ -110,10 +110,9 @@
         /// <remarks>
         /// These values are specified in table 1 (page 12) of ISO 32000-1:2008.
         /// </remarks>
-        public static bool IsWhitespace(int c)
+        public static bool IsWhitespace(byte c)
         {
-            return c == 0 || c == 9 || c == 12 || c == AsciiLineFeed
-                   || c == AsciiCarriageReturn || c == ' ';
+            return c == 0 || c == 32 || c == AsciiLineFeed || c == AsciiCarriageReturn || c == 9 || c == 12;
         }
 
         public static bool IsEndOfLine(char c) => IsEndOfLine((byte) c);

src/UglyToad.PdfPig/Tokens/NumericToken.cs

@@ -1,8 +1,8 @@
 namespace UglyToad.PdfPig.Tokens
 {
-    using System;
     using System.Globalization;
 
+    /// <inheritdoc />
     /// <summary>
     /// PDF supports integer and real numbers. Integer objects represent mathematical integers within a certain interval centered at 0. 
     /// Real objects  approximate mathematical real numbers, but with limited range and precision.
@@ -16,22 +16,17 @@
         /// <summary>
         /// Whether the number represented has a non-zero decimal part.
         /// </summary>
-        public bool HasDecimalPlaces { get; }
+        public bool HasDecimalPlaces => decimal.Floor(Data) != Data;
 
         /// <summary>
         /// The value of this number as an <see langword="int"/>.
         /// </summary>
-        public int Int { get; }
-
-        /// <summary>
-        /// Whether the number overflows an integer.
-        /// </summary>
-        public bool IsBiggerThanInt { get; }
+        public int Int => (int) Data;
         
         /// <summary>
         /// The value of this number as a <see langword="long"/>.
         /// </summary>
-        public long Long { get; }
+        public long Long => (long) Data;
 
         /// <summary>
         /// The value of this number as a <see langword="double"/>.
@@ -45,17 +40,6 @@
         public NumericToken(decimal value)
         {
             Data = value;
-            HasDecimalPlaces = decimal.Floor(value) != value;
-            Long = (long) value;
-
-            try
-            {
-                Int = (int) value;
-            }
-            catch (OverflowException)
-            {
-                IsBiggerThanInt = true;
-            }
         }
 
         /// <inheritdoc />