System.Globalization.EncodingTable.internalGetCodePageFromName C# (CSharp) Method

        unsafe private static int internalGetCodePageFromName(String name) {
            int left  = 0;
            int right = lastEncodingItem;
            int index;
            int result;
    
            //Binary search the array until we have only a couple of elements left and then
            //just walk those elements.
            while ((right - left)>3) {
                index = ((right - left)/2) + left;
                
                bool success;
                result = String.nativeCompareOrdinalWC(name, encodingDataPtr[index].webName, true, out success);
    
                if (result == 0) {
                    //We found the item, return the associated codepage.
                    return (encodingDataPtr[index].codePage);
                } else if (result<0) {
                    //The name that we're looking for is less than our current index.
                    right = index;
                } else {
                    //The name that we're looking for is greater than our current index
                    left = index;
                }
            }
    
            //Walk the remaining elements (it'll be 3 or fewer).
            for (; left<=right; left++) {
                bool success;
                if (String.nativeCompareOrdinalWC(name, encodingDataPtr[left].webName, true,out success)==0) {
                    return (encodingDataPtr[left].codePage);
                }
            }
            // The encoding name is not valid.
            throw new ArgumentException(
                String.Format(
                    CultureInfo.CurrentCulture,
                    Environment.GetResourceString("Argument_EncodingNotSupported"), name), "name");
        }

        // Token: 0x06002E31 RID: 11825 RVA: 0x000B1204 File Offset: 0x000AF404
        internal static int GetCodePageFromName(string name)
        {
            if (name == null)
            {
                throw new ArgumentNullException("name");
            }
            object obj = EncodingTable.hashByName[name];

            if (obj != null)
            {
                return((int)obj);
            }
            int num = EncodingTable.internalGetCodePageFromName(name);

            EncodingTable.hashByName[name] = num;
            return(num);
        }