390 lines
9.5 KiB
C#
390 lines
9.5 KiB
C#
//
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// ParseNumbers.cs
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//
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// Authors:
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// Marek Safar <marek.safar@gmail.com>
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//
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// Copyright (C) 2015 Xamarin Inc (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Globalization;
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using System.Text;
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namespace System {
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static class ParseNumbers
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{
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internal const int PrintAsI1=0x40;
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internal const int PrintAsI2=0x80;
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// internal const int PrintAsI4=0x100;
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internal const int TreatAsUnsigned=0x200;
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internal const int TreatAsI1=0x400;
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internal const int TreatAsI2=0x800;
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internal const int IsTight=0x1000;
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internal const int NoSpace=0x2000;
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public static int StringToInt (string value, int fromBase, int flags)
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{
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unsafe {
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return StringToInt (value, fromBase, flags, null);
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}
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}
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public unsafe static int StringToInt (string value, int fromBase, int flags, int* parsePos)
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{
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if ((flags & (IsTight | NoSpace)) == 0)
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throw new NotImplementedException (flags.ToString ());
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if (value == null)
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return 0;
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int chars = 0;
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uint result = 0;
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int digitValue;
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int len = value.Length;
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bool negative = false;
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if (len == 0) {
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// Mimic broken .net behaviour
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throw new ArgumentOutOfRangeException ("Empty string");
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}
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int i = parsePos == null ? 0 : *parsePos;
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//Check for a sign
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if (value [i] == '-') {
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if (fromBase != 10)
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throw new ArgumentException ("String cannot contain a minus sign if the base is not 10.");
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if ((flags & TreatAsUnsigned) != 0)
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throw new OverflowException ("Negative number");
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negative = true;
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i++;
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} else if (value [i] == '+') {
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i++;
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}
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if (fromBase == 16 && i + 1 < len && value [i] =='0' && (value [i + 1] == 'x' || value [i + 1] == 'X')) {
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i += 2;
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}
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uint max_value;
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if ((flags & TreatAsI1) != 0) {
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max_value = Byte.MaxValue;
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} else if ((flags & TreatAsI2) != 0) {
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max_value = UInt16.MaxValue;
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} else {
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max_value = UInt32.MaxValue;
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}
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while (i < len) {
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char c = value [i];
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if (Char.IsNumber (c)) {
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digitValue = c - '0';
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} else if (Char.IsLetter (c)) {
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digitValue = Char.ToLowerInvariant (c) - 'a' + 10;
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} else {
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if (i == 0)
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throw new FormatException ("Could not find any parsable digits.");
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if ((flags & IsTight) != 0)
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throw new FormatException ("Additional unparsable characters are at the end of the string.");
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break;
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}
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if (digitValue >= fromBase) {
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if (chars > 0) {
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throw new FormatException ("Additional unparsable characters are at the end of the string.");
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}
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throw new FormatException ("Could not find any parsable digits.");
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}
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var res = (uint) fromBase * result + (uint) digitValue;
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if (res < result || res > max_value)
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throw new OverflowException ();
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result = res;
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chars++;
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++i;
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}
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if (chars == 0)
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throw new FormatException ("Could not find any parsable digits.");
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if (parsePos != null)
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*parsePos = i;
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return negative ? -(int)result : (int)result;
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}
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public static string LongToString (long value, int toBase, int width, char paddingChar, int flags)
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{
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if (value == 0)
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return "0";
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if (toBase == 10)
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return value.ToString ();
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byte[] val = BitConverter.GetBytes (value);
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switch (toBase) {
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case 2:
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return ConvertToBase2 (val).ToString ();
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case 8:
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return ConvertToBase8 (val).ToString ();
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case 16:
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return ConvertToBase16 (val).ToString ();
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default:
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throw new NotImplementedException ();
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}
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}
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public static long StringToLong (string value, int fromBase, int flags)
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{
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unsafe {
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return StringToLong (value, fromBase, flags, null);
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}
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}
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public unsafe static long StringToLong (string value, int fromBase, int flags, int* parsePos)
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{
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if ((flags & (IsTight | NoSpace)) == 0)
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throw new NotImplementedException (flags.ToString ());
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if (value == null)
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return 0;
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int chars = 0;
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int digitValue = -1;
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long result = 0;
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int len = value.Length;
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bool negative = false;
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if (len == 0) {
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// Mimic broken .net behaviour
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throw new ArgumentOutOfRangeException ("Empty string");
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}
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int i = parsePos == null ? 0 : *parsePos;
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//Check for a sign
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if (value [i] == '-') {
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if (fromBase != 10)
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throw new ArgumentException ("String cannot contain a minus sign if the base is not 10.");
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if ((flags & TreatAsUnsigned) != 0)
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throw new OverflowException ("Negative number");
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negative = true;
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i++;
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} else if (value [i] == '+') {
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i++;
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}
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if (fromBase == 16 && i + 1 < len && value [i] =='0' && (value [i + 1] == 'x' || value [i + 1] == 'X')) {
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i += 2;
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}
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while (i < len) {
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char c = value[i];
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if (Char.IsNumber (c)) {
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digitValue = c - '0';
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} else if (Char.IsLetter (c)) {
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digitValue = Char.ToLowerInvariant (c) - 'a' + 10;
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} else {
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if (i == 0)
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throw new FormatException ("Could not find any parsable digits.");
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if ((flags & IsTight) != 0)
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throw new FormatException ("Additional unparsable characters are at the end of the string.");
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break;
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}
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if (digitValue >= fromBase) {
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if (chars > 0) {
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throw new FormatException ("Additional unparsable "
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+ "characters are at the end of the string.");
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} else {
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throw new FormatException ("Could not find any parsable"
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+ " digits.");
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}
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}
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result = fromBase * result + digitValue;
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chars++;
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++i;
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}
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if (chars == 0)
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throw new FormatException ("Could not find any parsable digits.");
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if (parsePos != null)
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*parsePos = i;
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return negative ? -result : result;
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}
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public static string IntToString (int value, int toBase, int width, char paddingChar, int flags)
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{
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StringBuilder sb;
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if (value == 0) {
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if (width <= 0)
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return "0";
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sb = new StringBuilder ("0", width);
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} else if (toBase == 10)
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sb = new StringBuilder (value.ToString ());
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else {
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byte[] val;
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if ((flags & PrintAsI1) != 0) {
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val = BitConverter.GetBytes ((byte) value);
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} else if ((flags & PrintAsI2) != 0) {
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val = BitConverter.GetBytes ((short) value);
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} else {
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val = BitConverter.GetBytes (value);
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}
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switch (toBase) {
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case 2:
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sb = ConvertToBase2 (val);
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break;
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case 8:
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sb = ConvertToBase8 (val);
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break;
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case 16:
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sb = ConvertToBase16 (val);
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break;
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default:
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throw new NotImplementedException ();
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}
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}
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var padding = width - sb.Length;
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while (padding > 0) {
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sb.Insert (0, paddingChar);
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--padding;
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}
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return sb.ToString ();
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}
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static void EndianSwap (ref byte[] value)
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{
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byte[] buf = new byte[value.Length];
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for (int i = 0; i < value.Length; i++)
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buf[i] = value[value.Length-1-i];
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value = buf;
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}
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static StringBuilder ConvertToBase2 (byte[] value)
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{
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if (!BitConverter.IsLittleEndian)
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EndianSwap (ref value);
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StringBuilder sb = new StringBuilder ();
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for (int i = value.Length - 1; i >= 0; i--) {
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byte b = value [i];
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for (int j = 0; j < 8; j++) {
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if ((b & 0x80) == 0x80) {
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sb.Append ('1');
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}
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else {
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if (sb.Length > 0)
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sb.Append ('0');
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}
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b <<= 1;
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}
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}
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return sb;
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}
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static StringBuilder ConvertToBase8 (byte[] value)
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{
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ulong l = 0;
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switch (value.Length) {
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case 1:
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l = (ulong) value [0];
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break;
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case 2:
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l = (ulong) BitConverter.ToUInt16 (value, 0);
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break;
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case 4:
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l = (ulong) BitConverter.ToUInt32 (value, 0);
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break;
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case 8:
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l = BitConverter.ToUInt64 (value, 0);
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break;
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default:
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throw new ArgumentException ("value");
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}
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StringBuilder sb = new StringBuilder ();
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for (int i = 21; i >= 0; i--) {
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// 3 bits at the time
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char val = (char) ((l >> i * 3) & 0x7);
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if ((val != 0) || (sb.Length > 0)) {
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val += '0';
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sb.Append (val);
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}
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}
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return sb;
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}
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static StringBuilder ConvertToBase16 (byte[] value)
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{
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if (!BitConverter.IsLittleEndian)
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EndianSwap (ref value);
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StringBuilder sb = new StringBuilder ();
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for (int i = value.Length - 1; i >= 0; i--) {
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char high = (char)((value[i] >> 4) & 0x0f);
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if ((high != 0) || (sb.Length > 0)) {
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if (high < 10)
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high += '0';
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else {
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high -= (char) 10;
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high += 'a';
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}
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sb.Append (high);
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}
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char low = (char)(value[i] & 0x0f);
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if ((low != 0) || (sb.Length > 0)) {
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if (low < 10)
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low += '0';
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else {
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low -= (char) 10;
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low += 'a';
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}
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sb.Append (low);
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}
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}
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return sb;
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}
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}
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}
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