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using System;
using System.Xml;
using System.Diagnostics;
using System.Collections;
using System.Globalization;
using System.Collections.Generic;
using System.Threading.Tasks;
namespace System.Xml {
internal sealed partial class XmlSubtreeReader : XmlWrappingReader, IXmlLineInfo, IXmlNamespaceResolver {
public override Task<string> GetValueAsync() {
if (useCurNode) {
return Task.FromResult(curNode.value);
}
else {
return reader.GetValueAsync();
}
}
public override async Task< bool > ReadAsync() {
switch ( state ) {
case State.Initial:
useCurNode = false;
state = State.Interactive;
ProcessNamespaces();
return true;
case State.Interactive:
curNsAttr = -1;
useCurNode = false;
reader.MoveToElement();
Debug.Assert( reader.Depth >= initialDepth );
if ( reader.Depth == initialDepth ) {
if ( reader.NodeType == XmlNodeType.EndElement ||
( reader.NodeType == XmlNodeType.Element && reader.IsEmptyElement ) ) {
state = State.EndOfFile;
SetEmptyNode();
return false;
}
Debug.Assert( reader.NodeType == XmlNodeType.Element && !reader.IsEmptyElement );
}
if ( await reader.ReadAsync().ConfigureAwait(false) ) {
ProcessNamespaces();
return true;
}
else {
SetEmptyNode();
return false;
}
case State.EndOfFile:
case State.Closed:
case State.Error:
return false;
case State.PopNamespaceScope:
nsManager.PopScope();
goto case State.ClearNsAttributes;
case State.ClearNsAttributes:
nsAttrCount = 0;
state = State.Interactive;
goto case State.Interactive;
case State.ReadElementContentAsBase64:
case State.ReadElementContentAsBinHex:
if ( !await FinishReadElementContentAsBinaryAsync().ConfigureAwait(false) ) {
return false;
}
return await ReadAsync().ConfigureAwait(false);
case State.ReadContentAsBase64:
case State.ReadContentAsBinHex:
if ( !await FinishReadContentAsBinaryAsync().ConfigureAwait(false) ) {
return false;
}
return await ReadAsync().ConfigureAwait(false);
default:
Debug.Assert( false );
return false;
}
}
public override async Task SkipAsync() {
switch ( state ) {
case State.Initial:
await ReadAsync().ConfigureAwait(false);
return;
case State.Interactive:
curNsAttr = -1;
useCurNode = false;
reader.MoveToElement();
Debug.Assert( reader.Depth >= initialDepth );
if ( reader.Depth == initialDepth ) {
if ( reader.NodeType == XmlNodeType.Element && !reader.IsEmptyElement ) {
// we are on root of the subtree -> skip to the end element and set to Eof state
if ( await reader.ReadAsync().ConfigureAwait(false) ) {
while ( reader.NodeType != XmlNodeType.EndElement && reader.Depth > initialDepth ) {
await reader.SkipAsync().ConfigureAwait(false);
}
}
}
Debug.Assert( reader.NodeType == XmlNodeType.EndElement ||
reader.NodeType == XmlNodeType.Element && reader.IsEmptyElement ||
reader.ReadState != ReadState.Interactive );
state = State.EndOfFile;
SetEmptyNode();
return;
}
if ( reader.NodeType == XmlNodeType.Element && !reader.IsEmptyElement ) {
nsManager.PopScope();
}
await reader.SkipAsync().ConfigureAwait(false);
ProcessNamespaces();
Debug.Assert( reader.Depth >= initialDepth );
return;
case State.Closed:
case State.EndOfFile:
return;
case State.PopNamespaceScope:
nsManager.PopScope();
goto case State.ClearNsAttributes;
case State.ClearNsAttributes:
nsAttrCount = 0;
state = State.Interactive;
goto case State.Interactive;
case State.ReadElementContentAsBase64:
case State.ReadElementContentAsBinHex:
if ( await FinishReadElementContentAsBinaryAsync().ConfigureAwait(false) ) {
await SkipAsync().ConfigureAwait(false);
}
break;
case State.ReadContentAsBase64:
case State.ReadContentAsBinHex:
if ( await FinishReadContentAsBinaryAsync().ConfigureAwait(false) ) {
await SkipAsync().ConfigureAwait(false);
}
break;
case State.Error:
return;
default:
Debug.Assert( false );
return;
}
}
public override async Task< object > ReadContentAsObjectAsync() {
try {
InitReadContentAsType( "ReadContentAsObject" );
object value = await reader.ReadContentAsObjectAsync().ConfigureAwait(false);
FinishReadContentAsType();
return value;
}
catch {
state = State.Error;
throw;
}
}
public override async Task< string > ReadContentAsStringAsync() {
try {
InitReadContentAsType( "ReadContentAsString" );
string value = await reader.ReadContentAsStringAsync().ConfigureAwait(false);
FinishReadContentAsType();
return value;
}
catch {
state = State.Error;
throw;
}
}
public override async Task< object > ReadContentAsAsync( Type returnType, IXmlNamespaceResolver namespaceResolver ) {
try {
InitReadContentAsType( "ReadContentAs" );
object value = await reader.ReadContentAsAsync( returnType, namespaceResolver ).ConfigureAwait(false);
FinishReadContentAsType();
return value;
}
catch {
state = State.Error;
throw;
}
}
public override async Task< int > ReadContentAsBase64Async( byte[] buffer, int index, int count ) {
switch ( state ) {
case State.Initial:
case State.EndOfFile:
case State.Closed:
case State.Error:
return 0;
case State.ClearNsAttributes:
case State.PopNamespaceScope:
switch ( NodeType ) {
case XmlNodeType.Element:
throw CreateReadContentAsException( "ReadContentAsBase64" );
case XmlNodeType.EndElement:
return 0;
case XmlNodeType.Attribute:
if ( curNsAttr != -1 && reader.CanReadBinaryContent ) {
CheckBuffer( buffer, index, count );
if ( count == 0 ) {
return 0;
}
if ( nsIncReadOffset == 0 ) {
// called first time on this ns attribute
if ( binDecoder != null && binDecoder is Base64Decoder ) {
binDecoder.Reset();
}
else {
binDecoder = new Base64Decoder();
}
}
if ( nsIncReadOffset == curNode.value.Length ) {
return 0;
}
binDecoder.SetNextOutputBuffer( buffer, index, count );
nsIncReadOffset += binDecoder.Decode( curNode.value, nsIncReadOffset, curNode.value.Length - nsIncReadOffset );
return binDecoder.DecodedCount;
}
goto case XmlNodeType.Text;
case XmlNodeType.Text:
Debug.Assert( AttributeCount > 0 );
return await reader.ReadContentAsBase64Async( buffer, index, count ).ConfigureAwait(false);
default:
Debug.Assert( false );
return 0;
}
case State.Interactive:
state = State.ReadContentAsBase64;
goto case State.ReadContentAsBase64;
case State.ReadContentAsBase64:
int read = await reader.ReadContentAsBase64Async( buffer, index, count ).ConfigureAwait(false);
if ( read == 0 ) {
state = State.Interactive;
ProcessNamespaces();
}
return read;
case State.ReadContentAsBinHex:
case State.ReadElementContentAsBase64:
case State.ReadElementContentAsBinHex:
throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) );
default:
Debug.Assert( false );
return 0;
}
}
public override async Task< int > ReadElementContentAsBase64Async( byte[] buffer, int index, int count ) {
switch (state) {
case State.Initial:
case State.EndOfFile:
case State.Closed:
case State.Error:
return 0;
case State.Interactive:
case State.PopNamespaceScope:
case State.ClearNsAttributes:
if ( !await InitReadElementContentAsBinaryAsync( State.ReadElementContentAsBase64 ).ConfigureAwait(false) ) {
return 0;
}
goto case State.ReadElementContentAsBase64;
case State.ReadElementContentAsBase64:
int read = await reader.ReadContentAsBase64Async( buffer, index, count ).ConfigureAwait(false);
if ( read > 0 || count == 0 ) {
return read;
}
if ( NodeType != XmlNodeType.EndElement ) {
throw new XmlException(Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo);
}
// pop namespace scope
state = State.Interactive;
ProcessNamespaces();
// set eof state or move off the end element
if ( reader.Depth == initialDepth ) {
state = State.EndOfFile;
SetEmptyNode();
}
else {
await ReadAsync().ConfigureAwait(false);
}
return 0;
case State.ReadContentAsBase64:
case State.ReadContentAsBinHex:
case State.ReadElementContentAsBinHex:
throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) );
default:
Debug.Assert( false );
return 0;
}
}
public override async Task< int > ReadContentAsBinHexAsync( byte[] buffer, int index, int count ) {
switch (state) {
case State.Initial:
case State.EndOfFile:
case State.Closed:
case State.Error:
return 0;
case State.ClearNsAttributes:
case State.PopNamespaceScope:
switch ( NodeType ) {
case XmlNodeType.Element:
throw CreateReadContentAsException( "ReadContentAsBinHex" );
case XmlNodeType.EndElement:
return 0;
case XmlNodeType.Attribute:
if (curNsAttr != -1 && reader.CanReadBinaryContent) {
CheckBuffer( buffer, index, count );
if ( count == 0 ) {
return 0;
}
if ( nsIncReadOffset == 0 ) {
// called first time on this ns attribute
if ( binDecoder != null && binDecoder is BinHexDecoder ) {
binDecoder.Reset();
}
else {
binDecoder = new BinHexDecoder();
}
}
if ( nsIncReadOffset == curNode.value.Length ) {
return 0;
}
binDecoder.SetNextOutputBuffer( buffer, index, count );
nsIncReadOffset += binDecoder.Decode( curNode.value, nsIncReadOffset, curNode.value.Length - nsIncReadOffset );
return binDecoder.DecodedCount; }
goto case XmlNodeType.Text;
case XmlNodeType.Text:
Debug.Assert( AttributeCount > 0 );
return await reader.ReadContentAsBinHexAsync( buffer, index, count ).ConfigureAwait(false);
default:
Debug.Assert( false );
return 0;
}
case State.Interactive:
state = State.ReadContentAsBinHex;
goto case State.ReadContentAsBinHex;
case State.ReadContentAsBinHex:
int read = await reader.ReadContentAsBinHexAsync( buffer, index, count ).ConfigureAwait(false);
if ( read == 0 ) {
state = State.Interactive;
ProcessNamespaces();
}
return read;
case State.ReadContentAsBase64:
case State.ReadElementContentAsBase64:
case State.ReadElementContentAsBinHex:
throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) );
default:
Debug.Assert( false );
return 0;
}
}
public override async Task< int > ReadElementContentAsBinHexAsync( byte[] buffer, int index, int count ) {
switch (state) {
case State.Initial:
case State.EndOfFile:
case State.Closed:
case State.Error:
return 0;
case State.Interactive:
case State.PopNamespaceScope:
case State.ClearNsAttributes:
if ( !await InitReadElementContentAsBinaryAsync( State.ReadElementContentAsBinHex ).ConfigureAwait(false) ) {
return 0;
}
goto case State.ReadElementContentAsBinHex;
case State.ReadElementContentAsBinHex:
int read = await reader.ReadContentAsBinHexAsync( buffer, index, count ).ConfigureAwait(false);
if ( read > 0 || count == 0 ) {
return read;
}
if ( NodeType != XmlNodeType.EndElement ) {
throw new XmlException(Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo);
}
// pop namespace scope
state = State.Interactive;
ProcessNamespaces();
// set eof state or move off the end element
if ( reader.Depth == initialDepth ) {
state = State.EndOfFile;
SetEmptyNode();
}
else {
await ReadAsync().ConfigureAwait(false);
}
return 0;
case State.ReadContentAsBase64:
case State.ReadContentAsBinHex:
case State.ReadElementContentAsBase64:
throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) );
default:
Debug.Assert( false );
return 0;
}
}
public override Task< int > ReadValueChunkAsync( char[] buffer, int index, int count ) {
switch (state) {
case State.Initial:
case State.EndOfFile:
case State.Closed:
case State.Error:
return Task.FromResult(0);
case State.ClearNsAttributes:
case State.PopNamespaceScope:
// ReadValueChunk implementation on added xmlns attributes
if (curNsAttr != -1 && reader.CanReadValueChunk) {
CheckBuffer( buffer, index, count );
int copyCount = curNode.value.Length - nsIncReadOffset;
if ( copyCount > count ) {
copyCount = count;
}
if ( copyCount > 0 ) {
curNode.value.CopyTo( nsIncReadOffset, buffer, index, copyCount );
}
nsIncReadOffset += copyCount;
return Task.FromResult(copyCount);
}
// Otherwise fall back to the case State.Interactive.
// No need to clean ns attributes or pop scope because the reader when ReadValueChunk is called
// - on Element errors
// - on EndElement errors
// - on Attribute does not move
// and that's all where State.ClearNsAttributes or State.PopnamespaceScope can be set
goto case State.Interactive;
case State.Interactive:
return reader.ReadValueChunkAsync(buffer, index, count);
case State.ReadElementContentAsBase64:
case State.ReadElementContentAsBinHex:
case State.ReadContentAsBase64:
case State.ReadContentAsBinHex:
throw new InvalidOperationException( Res.GetString( Res.Xml_MixingReadValueChunkWithBinary ) );
default:
Debug.Assert( false );
return Task.FromResult(0);
}
}
private async Task< bool > InitReadElementContentAsBinaryAsync( State binaryState ) {
if ( NodeType != XmlNodeType.Element ) {
throw reader.CreateReadElementContentAsException( "ReadElementContentAsBase64" );
}
bool isEmpty = IsEmptyElement;
// move to content or off the empty element
if ( !await ReadAsync().ConfigureAwait(false) || isEmpty ) {
return false;
}
// special-case child element and end element
switch ( NodeType ) {
case XmlNodeType.Element:
throw new XmlException(Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo);
case XmlNodeType.EndElement:
// pop scope & move off end element
ProcessNamespaces();
await ReadAsync().ConfigureAwait(false);
return false;
}
Debug.Assert( state == State.Interactive );
state = binaryState;
return true;
}
private async Task< bool > FinishReadElementContentAsBinaryAsync() {
Debug.Assert( state == State.ReadElementContentAsBase64 || state == State.ReadElementContentAsBinHex );
byte[] bytes = new byte[256];
if ( state == State.ReadElementContentAsBase64 ) {
while ( await reader.ReadContentAsBase64Async( bytes, 0, 256 ).ConfigureAwait(false) > 0 ) ;
}
else {
while ( await reader.ReadContentAsBinHexAsync( bytes, 0, 256 ).ConfigureAwait(false) > 0 ) ;
}
if ( NodeType != XmlNodeType.EndElement ) {
throw new XmlException(Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo);
}
// pop namespace scope
state = State.Interactive;
ProcessNamespaces();
// check eof
if ( reader.Depth == initialDepth ) {
state = State.EndOfFile;
SetEmptyNode();
return false;
}
// move off end element
return await ReadAsync().ConfigureAwait(false);
}
private async Task< bool > FinishReadContentAsBinaryAsync() {
Debug.Assert( state == State.ReadContentAsBase64 || state == State.ReadContentAsBinHex );
byte[] bytes = new byte[256];
if ( state == State.ReadContentAsBase64 ) {
while ( await reader.ReadContentAsBase64Async( bytes, 0, 256 ).ConfigureAwait(false) > 0 ) ;
}
else {
while ( await reader.ReadContentAsBinHexAsync( bytes, 0, 256 ).ConfigureAwait(false) > 0 ) ;
}
state = State.Interactive;
ProcessNamespaces();
// check eof
if ( reader.Depth == initialDepth ) {
state = State.EndOfFile;
SetEmptyNode();
return false;
}
return true;
}
}
}
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