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using System;
using System.IO;
using System.Text;
using System.Xml.Schema;
using System.Collections;
using System.Diagnostics;
using System.Globalization;
using System.Security.Policy;
using System.Collections.Generic;
using System.Security.Permissions;
using System.Runtime.Versioning;
using System.Threading.Tasks;
namespace System.Xml
{
internal sealed partial class XmlValidatingReaderImpl : XmlReader, IXmlLineInfo, IXmlNamespaceResolver {
// Returns the text value of the current node.
public override Task<string> GetValueAsync() {
return coreReader.GetValueAsync();
}
// Reads and validated next node from the input data
public override async Task< bool > ReadAsync() {
switch ( parsingFunction ) {
case ParsingFunction.Read:
if ( await coreReader.ReadAsync().ConfigureAwait(false) ) {
ProcessCoreReaderEvent();
return true;
}
else {
validator.CompleteValidation();
return false;
}
case ParsingFunction.ParseDtdFromContext:
parsingFunction = ParsingFunction.Read;
await ParseDtdFromParserContextAsync().ConfigureAwait(false);
goto case ParsingFunction.Read;
case ParsingFunction.Error:
case ParsingFunction.ReaderClosed:
return false;
case ParsingFunction.Init:
parsingFunction = ParsingFunction.Read; // this changes the value returned by ReadState
if ( coreReader.ReadState == ReadState.Interactive ) {
ProcessCoreReaderEvent();
return true;
}
else {
goto case ParsingFunction.Read;
}
case ParsingFunction.ResolveEntityInternally:
parsingFunction = ParsingFunction.Read;
await ResolveEntityInternallyAsync().ConfigureAwait(false);
goto case ParsingFunction.Read;
case ParsingFunction.InReadBinaryContent:
parsingFunction = ParsingFunction.Read;
await readBinaryHelper.FinishAsync().ConfigureAwait(false);
goto case ParsingFunction.Read;
default:
Debug.Assert( false );
return false;
}
}
public override async Task< int > ReadContentAsBase64Async( byte[] buffer, int index, int count ) {
if ( ReadState != ReadState.Interactive ) {
return 0;
}
// init ReadChunkHelper if called the first time
if ( parsingFunction != ParsingFunction.InReadBinaryContent ) {
readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, outerReader );
}
// set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper
parsingFunction = ParsingFunction.Read;
// call to the helper
int readCount = await readBinaryHelper.ReadContentAsBase64Async( buffer, index, count ).ConfigureAwait(false);
// setup parsingFunction
parsingFunction = ParsingFunction.InReadBinaryContent;
return readCount;
}
public override async Task< int > ReadContentAsBinHexAsync( byte[] buffer, int index, int count ) {
if ( ReadState != ReadState.Interactive ) {
return 0;
}
// init ReadChunkHelper when called first time
if ( parsingFunction != ParsingFunction.InReadBinaryContent ) {
readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, outerReader );
}
// set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper
parsingFunction = ParsingFunction.Read;
// call to the helper
int readCount = await readBinaryHelper.ReadContentAsBinHexAsync( buffer, index, count ).ConfigureAwait(false);
// setup parsingFunction
parsingFunction = ParsingFunction.InReadBinaryContent;
return readCount;
}
public override async Task< int > ReadElementContentAsBase64Async( byte[] buffer, int index, int count ) {
if ( ReadState != ReadState.Interactive ) {
return 0;
}
// init ReadChunkHelper if called the first time
if ( parsingFunction != ParsingFunction.InReadBinaryContent ) {
readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, outerReader );
}
// set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper
parsingFunction = ParsingFunction.Read;
// call to the helper
int readCount = await readBinaryHelper.ReadElementContentAsBase64Async( buffer, index, count ).ConfigureAwait(false);
// setup parsingFunction
parsingFunction = ParsingFunction.InReadBinaryContent;
return readCount;
}
public override async Task< int > ReadElementContentAsBinHexAsync( byte[] buffer, int index, int count ) {
if ( ReadState != ReadState.Interactive ) {
return 0;
}
// init ReadChunkHelper when called first time
if ( parsingFunction != ParsingFunction.InReadBinaryContent ) {
readBinaryHelper = ReadContentAsBinaryHelper.CreateOrReset( readBinaryHelper, outerReader );
}
// set parsingFunction to Read state in order to have a normal Read() behavior when called from readBinaryHelper
parsingFunction = ParsingFunction.Read;
// call to the helper
int readCount = await readBinaryHelper.ReadElementContentAsBinHexAsync( buffer, index, count ).ConfigureAwait(false);
// setup parsingFunction
parsingFunction = ParsingFunction.InReadBinaryContent;
return readCount;
}
internal async Task MoveOffEntityReferenceAsync() {
if ( outerReader.NodeType == XmlNodeType.EntityReference && parsingFunction != ParsingFunction.ResolveEntityInternally ) {
if ( !await outerReader.ReadAsync().ConfigureAwait(false) ) {
throw new InvalidOperationException( Res.GetString(Res.Xml_InvalidOperation ) );
}
}
}
// Returns typed value of the current node (based on the type specified by schema)
public async Task< object > ReadTypedValueAsync() {
if ( validationType == ValidationType.None ) {
return null;
}
switch ( outerReader.NodeType ) {
case XmlNodeType.Attribute:
return coreReaderImpl.InternalTypedValue;
case XmlNodeType.Element:
if ( SchemaType == null ) {
return null;
}
XmlSchemaDatatype dtype = ( SchemaType is XmlSchemaDatatype ) ? (XmlSchemaDatatype)SchemaType : ((XmlSchemaType)SchemaType).Datatype;
if ( dtype != null ) {
if ( !outerReader.IsEmptyElement ) {
for (;;) {
if ( !await outerReader.ReadAsync().ConfigureAwait(false) ) {
throw new InvalidOperationException( Res.GetString( Res.Xml_InvalidOperation ) );
}
XmlNodeType type = outerReader.NodeType;
if ( type != XmlNodeType.CDATA && type != XmlNodeType.Text &&
type != XmlNodeType.Whitespace && type != XmlNodeType.SignificantWhitespace &&
type != XmlNodeType.Comment && type != XmlNodeType.ProcessingInstruction ) {
break;
}
}
if ( outerReader.NodeType != XmlNodeType.EndElement ) {
throw new XmlException( Res.Xml_InvalidNodeType, outerReader.NodeType.ToString());
}
}
return coreReaderImpl.InternalTypedValue;
}
return null;
case XmlNodeType.EndElement:
return null;
default:
if ( coreReaderImpl.V1Compat ) { //If v1 XmlValidatingReader return null
return null;
}
else {
return await GetValueAsync().ConfigureAwait(false);
}
}
}
//
// Private implementation methods
//
private async Task ParseDtdFromParserContextAsync()
{
Debug.Assert( parserContext != null );
Debug.Assert( coreReaderImpl.DtdInfo == null );
if ( parserContext.DocTypeName == null || parserContext.DocTypeName.Length == 0 ) {
return;
}
IDtdParser dtdParser = DtdParser.Create();
XmlTextReaderImpl.DtdParserProxy proxy = new XmlTextReaderImpl.DtdParserProxy(coreReaderImpl);
IDtdInfo dtdInfo = await dtdParser.ParseFreeFloatingDtdAsync( parserContext.BaseURI, parserContext.DocTypeName, parserContext.PublicId, parserContext.SystemId, parserContext.InternalSubset, proxy ).ConfigureAwait(false);
coreReaderImpl.SetDtdInfo( dtdInfo);
ValidateDtd();
}
private async Task ResolveEntityInternallyAsync() {
Debug.Assert( coreReader.NodeType == XmlNodeType.EntityReference );
int initialDepth = coreReader.Depth;
outerReader.ResolveEntity();
while ( await outerReader.ReadAsync().ConfigureAwait(false) && coreReader.Depth > initialDepth );
}
}
}
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