diff options
Diffstat (limited to 'src/mscorlib/src/System/Globalization/EncodingTable.cs')
| -rw-r--r-- | src/mscorlib/src/System/Globalization/EncodingTable.cs | 134 |
1 files changed, 73 insertions, 61 deletions
diff --git a/src/mscorlib/src/System/Globalization/EncodingTable.cs b/src/mscorlib/src/System/Globalization/EncodingTable.cs index b7c268a956..6d9cc3127f 100644 --- a/src/mscorlib/src/System/Globalization/EncodingTable.cs +++ b/src/mscorlib/src/System/Globalization/EncodingTable.cs @@ -2,44 +2,44 @@ // The .NET Foundation licenses this file to you under the MIT license. // See the LICENSE file in the project root for more information. +using System; +using System.Text; +using System.Collections; +using System.Collections.Generic; +using System.Runtime.CompilerServices; +using System.Runtime.InteropServices; +using System.Runtime.Versioning; +using System.Security; +using System.Threading; +using System.Diagnostics.Contracts; + namespace System.Globalization { - using System; - using System.Text; - using System.Collections; - using System.Collections.Generic; - using System.Runtime.CompilerServices; - using System.Runtime.InteropServices; - using System.Runtime.Versioning; - using System.Security; - using System.Threading; - using System.Diagnostics.Contracts; // // Data table for encoding classes. Used by System.Text.Encoding. // This class contains two hashtables to allow System.Text.Encoding // to retrieve the data item either by codepage value or by webName. // - + // Only statics, does not need to be marked with the serializable attribute internal static class EncodingTable { - //This number is the size of the table in native. The value is retrieved by //calling the native GetNumEncodingItems(). private static int lastEncodingItem = GetNumEncodingItems() - 1; //This number is the size of the code page table. Its generated when we walk the table the first time. private static volatile int lastCodePageItem; - + // // This points to a native data table which maps an encoding name to the correct code page. // - unsafe internal static InternalEncodingDataItem *encodingDataPtr = GetEncodingData(); + unsafe internal static InternalEncodingDataItem* encodingDataPtr = GetEncodingData(); // // This points to a native data table which stores the properties for the code page, and // the table is indexed by code page. // - unsafe internal static InternalCodePageDataItem *codePageDataPtr = GetCodePageData(); + unsafe internal static InternalCodePageDataItem* codePageDataPtr = GetCodePageData(); // // This caches the mapping of an encoding name to a code page. // @@ -49,40 +49,45 @@ namespace System.Globalization // private static Hashtable hashByCodePage = Hashtable.Synchronized(new Hashtable()); - static EncodingTable() - { - } - // Find the data item by binary searching the table that we have in native. // nativeCompareOrdinalWC is an internal-only function. - unsafe private static int internalGetCodePageFromName(String name) { - int left = 0; + 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; - + while ((right - left) > 3) + { + index = ((right - left) / 2) + left; + result = String.nativeCompareOrdinalIgnoreCaseWC(name, encodingDataPtr[index].webName); - - if (result == 0) { + + if (result == 0) + { //We found the item, return the associated codepage. return (encodingDataPtr[index].codePage); - } else if (result<0) { + } + else if (result < 0) + { //The name that we're looking for is less than our current index. right = index; - } else { + } + 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++) { - if (String.nativeCompareOrdinalIgnoreCaseWC(name, encodingDataPtr[left].webName) == 0) { + for (; left <= right; left++) + { + if (String.nativeCompareOrdinalIgnoreCaseWC(name, encodingDataPtr[left].webName) == 0) + { return (encodingDataPtr[left].codePage); } } @@ -90,7 +95,7 @@ namespace System.Globalization throw new ArgumentException( String.Format( CultureInfo.CurrentCulture, - Environment.GetResourceString("Argument_EncodingNotSupported"), name), nameof(name)); + SR.Argument_EncodingNotSupported, name), nameof(name)); } // Return a list of all EncodingInfo objects describing all of our encodings @@ -112,12 +117,12 @@ namespace System.Globalization for (i = 0; i < lastCodePageItem; i++) { arrayEncodingInfo[i] = new EncodingInfo(codePageDataPtr[i].codePage, CodePageDataItem.CreateString(codePageDataPtr[i].Names, 0), - Environment.GetResourceString("Globalization.cp_" + codePageDataPtr[i].codePage)); + SR.GetResourceString("Globalization_cp_" + codePageDataPtr[i].codePage)); } - + return arrayEncodingInfo; - } - + } + /*=================================GetCodePageFromName========================== **Action: Given a encoding name, return the correct code page number for this encoding. **Returns: The code page for the encoding. @@ -127,10 +132,11 @@ namespace System.Globalization ** ArgumentNullException if name is null. ** internalGetCodePageFromName will throw ArgumentException if name is not a valid encoding name. ============================================================================*/ - + internal static int GetCodePageFromName(String name) - { - if (name==null) { + { + if (name == null) + { throw new ArgumentNullException(nameof(name)); } Contract.EndContractBlock(); @@ -143,7 +149,8 @@ namespace System.Globalization // codePageObj = hashByName[name]; - if (codePageObj!=null) { + if (codePageObj != null) + { return ((int)codePageObj); } @@ -155,8 +162,9 @@ namespace System.Globalization return codePage; } - - unsafe internal static CodePageDataItem GetCodePageDataItem(int codepage) { + + unsafe internal static CodePageDataItem GetCodePageDataItem(int codepage) + { CodePageDataItem dataItem; // We synchronize around dictionary gets/sets. There's still a possibility that two threads @@ -166,9 +174,10 @@ namespace System.Globalization //Look up the item in the hashtable. dataItem = (CodePageDataItem)hashByCodePage[codepage]; - + //If we found it, return it. - if (dataItem!=null) { + if (dataItem != null) + { return dataItem; } @@ -179,22 +188,24 @@ namespace System.Globalization // int i = 0; int data; - while ((data = codePageDataPtr[i].codePage) != 0) { - if (data == codepage) { + while ((data = codePageDataPtr[i].codePage) != 0) + { + if (data == codepage) + { dataItem = new CodePageDataItem(i); hashByCodePage[codepage] = dataItem; return (dataItem); } i++; } - + //Nope, we didn't find it. return null; } [MethodImplAttribute(MethodImplOptions.InternalCall)] - private unsafe static extern InternalEncodingDataItem *GetEncodingData(); - + private unsafe static extern InternalEncodingDataItem* GetEncodingData(); + // // Return the number of encoding data items. // @@ -204,18 +215,19 @@ namespace System.Globalization [MethodImplAttribute(MethodImplOptions.InternalCall)] private unsafe static extern InternalCodePageDataItem* GetCodePageData(); } - + /*=================================InternalEncodingDataItem========================== **Action: This is used to map a encoding name to a correct code page number. By doing this, ** we can get the properties of this encoding via the InternalCodePageDataItem. ** ** We use this structure to access native data exposed by the native side. ============================================================================*/ - + [System.Runtime.InteropServices.StructLayout(LayoutKind.Sequential)] - internal unsafe struct InternalEncodingDataItem { - internal sbyte * webName; - internal UInt16 codePage; + internal unsafe struct InternalEncodingDataItem + { + internal sbyte* webName; + internal UInt16 codePage; } /*=================================InternalCodePageDataItem========================== @@ -224,11 +236,11 @@ namespace System.Globalization ============================================================================*/ [System.Runtime.InteropServices.StructLayout(LayoutKind.Sequential)] - internal unsafe struct InternalCodePageDataItem { - internal UInt16 codePage; - internal UInt16 uiFamilyCodePage; - internal uint flags; - internal sbyte * Names; + internal unsafe struct InternalCodePageDataItem + { + internal UInt16 codePage; + internal UInt16 uiFamilyCodePage; + internal uint flags; + internal sbyte* Names; } - } |