ClassLibraryWeiBao/QR二维码/Versions/VersionControl.cs

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using System;
using Gma.QrCodeNet.Encoding.DataEncodation;

namespace Gma.QrCodeNet.Encoding.Versions
{
	internal static class VersionControl
	{
		private const int NUM_BITS_MODE_INDICATOR = 4;
		private const string DEFAULT_ENCODING = QRCodeConstantVariable.DefaultEncoding;
		
		
		/// <summary>
		/// Determine which version to use
		/// </summary>
		/// <param name="dataBitsLength">Number of bits for encoded content</param>
		/// <param name="encodingName">Encoding name for EightBitByte</param>
		/// <returns>VersionDetail and ECI</returns>
		internal static VersionControlStruct InitialSetup(int dataBitsLength,  Mode mode, ErrorCorrectionLevel level, string encodingName)
		{
			int totalDataBits = dataBitsLength;
			
			bool containECI = false;
			
			BitList eciHeader = new BitList();
			
			
			//Check ECI header
			if(mode == Mode.EightBitByte)
			{
				if(encodingName != DEFAULT_ENCODING && encodingName != QRCodeConstantVariable.UTF8Encoding)
				{
					ECISet eciSet = new ECISet(ECISet.AppendOption.NameToValue);
					int eciValue = eciSet.GetECIValueByName(encodingName);
				
					totalDataBits += ECISet.NumOfECIHeaderBits(eciValue);
					eciHeader = eciSet.GetECIHeader(encodingName);
					containECI = true;
				}
			}
			//Determine which version group it belong to
			int searchGroup = DynamicSearchIndicator(totalDataBits, level, mode);
			
			int[] charCountIndicator = CharCountIndicatorTable.GetCharCountIndicatorSet(mode);
			
			totalDataBits += (NUM_BITS_MODE_INDICATOR + charCountIndicator[searchGroup]);
			
			int lowerSearchBoundary = searchGroup == 0 ? 1 : (VERSION_GROUP[searchGroup - 1] + 1);
			int higherSearchBoundary = VERSION_GROUP[searchGroup];
			
			//Binary search to find proper version
			int versionNum = BinarySearch(totalDataBits, level, lowerSearchBoundary, higherSearchBoundary);
			
			VersionControlStruct vcStruct = FillVCStruct(versionNum, level, encodingName);
			
			vcStruct.isContainECI = containECI;
			
			vcStruct.ECIHeader = eciHeader;
			
			return vcStruct;