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x2xmldatabinding/Shared/XMLDataBindingUtils.pas

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{
Helpers functions for the X2Software XML Data Binding
Last changed: $Date$
Revision: $Rev$
URL: $URL$
}
unit XMLDataBindingUtils;
interface
uses
Classes,
SysUtils,
XMLDoc,
xmldom,
XMLIntf;
type
EBase64Error = class(Exception);
TXMLDateTimeFormat = (xdtDateTime, xdtDate, xdtTime);
TXMLTimeFragment = (xtfMilliseconds, xtfTimezone);
TXMLTimeFragments = set of TXMLTimeFragment;
IXSDValidate = interface
['{3BFDC851-7459-403B-87B3-A52E9E85BC8C}']
procedure XSDValidate;
end;
TX2XMLNode = class(TXMLNode)
private
function GetChildNodesNS(const ANodeName, ANamespaceURI: DOMString): IXMLNode;
protected
property ChildNodesNS[const ANodeName, ANamespaceURI: DOMString]: IXMLNode read GetChildNodesNS;
end;
TX2XMLNodeCollection = class(TXMLNodeCollection)
private
function GetChildNodesNS(const ANodeName, ANamespaceURI: DOMString): IXMLNode;
protected
property ChildNodesNS[const ANodeName, ANamespaceURI: DOMString]: IXMLNode read GetChildNodesNS;
end;
TXMLNodeCollectionEnumerator = class(TInterfacedObject)
private
FNodeCollection: IXMLNodeCollection;
FIndex: Integer;
public
constructor Create(ANodeCollection: IXMLNodeCollection);
function GetCurrent: IXMLNode;
function MoveNext: Boolean; virtual;
property Current: IXMLNode read GetCurrent;
end;
const
AllTimeFragments = [Low(TXMLTimeFragment)..High(TXMLTimeFragment)];
function DateTimeToXML(ADate: TDateTime; AFormat: TXMLDateTimeFormat; ATimeFragments: TXMLTimeFragments = AllTimeFragments): string;
function XMLToDateTime(const ADate: string; AFormat: TXMLDateTimeFormat): TDateTime;
function BoolToXML(AValue: Boolean): WideString;
function XMLToBool(const AValue: WideString): Boolean;
function FloatToXML(AValue: Extended): WideString;
function XMLToFloat(const AValue: WideString): Extended;
function GetNodeIsNil(ANode: IXMLNode): Boolean;
procedure SetNodeIsNil(ANode: IXMLNode; ASetNil: Boolean);
procedure XSDValidate(AParent: IXMLNode; ARecurse: Boolean = True; AValidateParent: Boolean = True);
procedure CreateRequiredElements(AParent: IXMLNode; ANodes: array of string);
procedure CreateRequiredAttributes(AParent: IXMLNode; ANodes: array of string);
procedure SortChildNodes(AParent: IXMLNode; ASortOrder: array of string);
{ Now wraps the JclMime implementation:
Lightening fast Mime (Base64) Encoding and Decoding routines.
Coded by Ralf Junker (ralfjunker@gmx.de).}
function Base64Encode(AValue: String): String;
function Base64Decode(AValue: String): String;
procedure Base64DecodeToStream(AValue: String; AStream: TStream);
procedure Base64DecodeToFile(AValue: String; const AFileName: String);
const
XMLSchemaInstanceURI = 'http://www.w3.org/2001/XMLSchema-instance';
XMLDateFormat = 'yyyy"-"mm"-"dd';
XMLTimeFormat = 'hh":"nn":"ss';
XMLMsecsFormat = '"."zzz';
XMLTimezoneZulu = 'Z';
XMLTimezoneFormat = '%s%.2d:%.2d';
XMLDateTimeFormats: array[TXMLDateTimeFormat] of String =
(
XMLDateFormat + '"T"' + XMLTimeFormat,
XMLDateFormat,
XMLTimeFormat
);
XMLTimezoneSigns: array[Boolean] of Char = ('-', '+');
XMLBoolValues: array[Boolean] of String =
(
'false',
'true'
);
XMLIsNilAttribute = 'nil';
XMLIsNilAttributeNS = 'xsi:nil';
Base64ValidChars = ['A'..'Z', 'a'..'z', '0'..'9', '+', '/'];
Base64LookupTable = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' +
'abcdefghijklmnopqrstuvwxyz' +
'0123456789+/';
Base64Padding = '=';
implementation
uses
DateUtils,
Math,
Types,
Windows;
type
PSortNodeInfo = ^TSortNodeInfo;
TSortNodeInfo = record
Node: IXMLNode;
SortIndex: Integer;
OriginalIndex: Integer;
end;
function MimeEncodeString(const S: AnsiString): AnsiString; forward;
function MimeDecodeString(const S: AnsiString): AnsiString; forward;
procedure MimeEncodeStream(const InputStream: TStream; const OutputStream: TStream); forward;
procedure MimeDecodeStream(const InputStream: TStream; const OutputStream: TStream); forward;
function MimeEncodedSize(const I: Cardinal): Cardinal; forward;
function MimeDecodedSize(const I: Cardinal): Cardinal; forward;
procedure MimeEncode(var InputBuffer; const InputByteCount: Cardinal; var OutputBuffer); forward;
function MimeDecode(var InputBuffer; const InputBytesCount: Cardinal; var OutputBuffer): Cardinal; forward;
function MimeDecodePartial(var InputBuffer; const InputBytesCount: Cardinal; var OutputBuffer; var ByteBuffer: Cardinal; var ByteBufferSpace: Cardinal): Cardinal; forward;
function MimeDecodePartialEnd(var OutputBuffer; const ByteBuffer: Cardinal; const ByteBufferSpace: Cardinal): Cardinal; forward;
{ TX2XMLNode }
function TX2XMLNode.GetChildNodesNS(const ANodeName, ANamespaceURI: DOMString): IXMLNode;
begin
Result := ChildNodes.FindNode(ANodeName, ANamespaceURI);
if (not Assigned(Result)) and (doNodeAutoCreate in OwnerDocument.Options) then
Result := AddChild(ANodeName, ANamespaceURI);
end;
{ TX2XMLNodeCollection }
function TX2XMLNodeCollection.GetChildNodesNS(const ANodeName, ANamespaceURI: DOMString): IXMLNode;
begin
Result := ChildNodes.FindNode(ANodeName, ANamespaceURI);
if (not Assigned(Result)) and (doNodeAutoCreate in OwnerDocument.Options) then
Result := AddChild(ANodeName, ANamespaceURI);
end;
{ TXMLNodeCollectionEnumerator }
constructor TXMLNodeCollectionEnumerator.Create(ANodeCollection: IXMLNodeCollection);
begin
inherited Create;
FNodeCollection := ANodeCollection;
FIndex := -1;
end;
function TXMLNodeCollectionEnumerator.GetCurrent: IXMLNode;
begin
if (FIndex >= 0) and (FIndex < FNodeCollection.Count) then
Result := FNodeCollection.Nodes[FIndex]
else
Result := nil;
end;
function TXMLNodeCollectionEnumerator.MoveNext: Boolean;
begin
Inc(FIndex);
Result := (FIndex < FNodeCollection.Count);
end;
function DateTimeToXML(ADate: TDateTime; AFormat: TXMLDateTimeFormat; ATimeFragments: TXMLTimeFragments): string;
var
formatSettings: TFormatSettings;
timeZone: TTimeZoneInformation;
timeOffset: Integer;
begin
GetLocaleFormatSettings(LOCALE_SYSTEM_DEFAULT, formatSettings);
Result := FormatDateTime(XMLDateTimeFormats[AFormat], ADate, formatSettings);
if AFormat in [xdtDateTime, xdtTime] then
begin
if xtfMilliseconds in ATimeFragments then
Result := Result + FormatDateTime(XMLMsecsFormat, ADate);
if xtfTimezone in ATimeFragments then
begin
FillChar(timeZone, SizeOf(TTimeZoneInformation), #0);
if GetTimeZoneInformation(timeZone) <> TIME_ZONE_ID_INVALID then
begin
timeOffset := -timeZone.Bias;
if timeOffset = 0 then
Result := Result + XMLTimezoneZulu
else
Result := Result + Format(XMLTimezoneFormat,
[XMLTimezoneSigns[timeOffset > 0],
Abs(timeZone.Bias div 60),
Abs(timeZone.Bias mod 60)]);
end;
end;
end;
end;
function XMLToDateTime(const ADate: string; AFormat: TXMLDateTimeFormat): TDateTime;
const
{ yyyy-mm-ddThh:nn:ss.zzz+xx:xx }
XMLTimeSeparatorPos = 11;
XMLTimeSeparator = 'T';
XMLMinTimeLength = 8;
var
date: string;
time: string;
year: Integer;
month: Integer;
day: Integer;
hour: Integer;
minute: Integer;
second: Integer;
msec: Integer;
hasTimezone: Boolean;
xmlOffset: Integer;
timeZone: TTimeZoneInformation;
localOffset: Integer;
begin
Result := 0;
date := '';
time := '';
case AFormat of
xdtDateTime:
begin
if (Length(ADate) < XMLTimeSeparatorPos) or
(ADate[XMLTimeSeparatorPos] <> XMLTimeSeparator) then
Exit;
date := ADate;
time := ADate;
SetLength(date, Pred(XMLTimeSeparatorPos));
Delete(time, 1, XMLTimeSeparatorPos);
end;
xdtDate:
begin
if Length(ADate) < Pred(XMLTimeSeparatorPos) then
Exit;
date := ADate;
end;
xdtTime:
begin
if Length(ADate) < XMLMinTimeLength then
Exit;
time := ADate;
end;
end;
if AFormat in [xdtDateTime, xdtDate] then
begin
{ Parse date (yyyy-mm-hh) }
if TryStrToInt(Copy(date, 1, 4), year) and
TryStrToInt(Copy(date, 6, 2), month) and
TryStrToInt(Copy(date, 9, 2), day) then
Result := EncodeDate(year, month, day);
end;
if AFormat in [xdtDateTime, xdtTime] then
begin
{ Parse time (hh:nn:ss) }
if TryStrToInt(Copy(time, 1, 2), hour) and
TryStrToInt(Copy(time, 4, 2), minute) and
TryStrToInt(Copy(time, 7, 2), second) then
begin
msec := 0;
Delete(time, 1, 8);
if Length(time) > 0 then
begin
if time[1] = '.' then
begin
{ Parse milliseconds (.zzz) }
if not TryStrToInt(Copy(time, 2, 3), msec) then
msec := 0;
Delete(time, 1, 4);
end;
end;
Result := Result + EncodeTime(hour, minute, second, msec);
if Length(time) > 0 then
begin
hasTimezone := False;
xmlOffset := 0;
if time[1] = XMLTimezoneZulu then
begin
{ Zulu time }
hasTimezone := True;
end else if time[1] in [XMLTimezoneSigns[False], XMLTimezoneSigns[True]] then
begin
{ Parse timezone ([+|-]xx:xx) }
if TryStrToInt(Copy(time, 2, 2), hour) and
TryStrToInt(Copy(time, 5, 2), minute) then
begin
xmlOffset := (hour * MinsPerHour) + minute;
hasTimezone := True;
if time[1] = XMLTimezoneSigns[False] then
xmlOffset := -xmlOffset;
end;
end;
if hasTimezone then
begin
FillChar(timeZone, SizeOf(TTimeZoneInformation), #0);
if GetTimeZoneInformation(timeZone) <> TIME_ZONE_ID_INVALID then
begin
localOffset := -timeZone.Bias;
Result := IncMinute(Result, localOffset - xmlOffset);
end;
end;
end;
end;
end;
end;
function BoolToXML(AValue: Boolean): WideString;
begin
Result := XMLBoolValues[AValue];
end;
function XMLToBool(const AValue: WideString): Boolean;
begin
Result := StrToBoolDef(AValue, False);
end;
function GetXMLFloatFormatSettings(): TFormatSettings;
begin
Result.DecimalSeparator := '.';
end;
function FloatToXML(AValue: Extended): WideString;
begin
Result := FloatToStr(AValue, GetXMLFloatFormatSettings());
end;
function XMLToFloat(const AValue: WideString): Extended;
begin
Result := StrToFloat(AValue, GetXMLFloatFormatSettings());
end;
function Base64Encode(AValue: String): String;
begin
Result := MimeEncodeString(AValue);
end;
function Base64Decode(AValue: String): String;
begin
Result := MimeDecodeString(AValue);
end;
procedure Base64DecodeToStream(AValue: String; AStream: TStream);
var
input: TStringStream;
begin
input := TStringStream.Create(AValue);
try
MimeDecodeStream(input, AStream);
finally
FreeAndNil(input);
end;
end;
procedure Base64DecodeToFile(AValue: String; const AFileName: String);
var
input: TStringStream;
output: TFileStream;
begin
input := TStringStream.Create(AValue);
try
output := TFileStream.Create(AFileName, fmCreate or fmShareDenyWrite);
try
MimeDecodeStream(input, output);
finally
FreeAndNil(output);
end;
finally
FreeAndNil(input);
end;
end;
function GetNodeIsNil(ANode: IXMLNode): Boolean;
begin
Result := ANode.HasAttribute(XMLIsNilAttribute, XMLSchemaInstanceURI) and
XMLToBool(ANode.GetAttributeNS(XMLIsNilAttribute, XMLSchemaInstanceURI));
end;
procedure SetNodeIsNil(ANode: IXMLNode; ASetNil: Boolean);
var
documentElement: IXMLNode;
begin
if ASetNil then
begin
ANode.ChildNodes.Clear;
documentElement := ANode.OwnerDocument.DocumentElement;
if not documentElement.HasAttribute('xmlns:xsi') then
documentElement.SetAttributeNS('xmlns:xsi', '', XMLSchemaInstanceURI);
ANode.SetAttributeNS(XMLIsNilAttributeNS, XMLSchemaInstanceURI, BoolToXML(True));
end else
ANode.AttributeNodes.Delete(XMLIsNilAttribute, XMLSchemaInstanceURI);
end;
function DoSortNodes(Item1, Item2: Pointer): Integer;
var
nodeInfo1: PSortNodeInfo;
nodeInfo2: PSortNodeInfo;
begin
nodeInfo1 := Item1;
nodeInfo2 := Item2;
if (nodeInfo1^.SortIndex > -1) and (nodeInfo2^.SortIndex = -1) then
Result := GreaterThanValue
else if (nodeInfo1^.SortIndex = -1) and (nodeInfo2^.SortIndex > -1) then
Result := LessThanValue
else if (nodeInfo1^.SortIndex = nodeInfo2^.SortIndex) then
Result := CompareValue(nodeInfo1^.OriginalIndex, nodeInfo2^.OriginalIndex)
else
Result := CompareValue(nodeInfo1^.SortIndex, nodeInfo2^.SortIndex);
end;
procedure XSDValidate(AParent: IXMLNode; ARecurse, AValidateParent: Boolean);
var
validate: IXSDValidate;
childIndex: Integer;
begin
if AValidateParent and Supports(AParent, IXSDValidate, validate) then
validate.XSDValidate;
if ARecurse then
begin
for childIndex := 0 to Pred(AParent.ChildNodes.Count) do
XSDValidate(AParent.ChildNodes[childIndex], ARecurse, True);
end;
end;
procedure CreateRequiredElements(AParent: IXMLNode; ANodes: array of string);
var
nodeIndex: Integer;
node: IXMLNode;
begin
for nodeIndex := Low(ANodes) to High(ANodes) do
begin
if not Assigned(AParent.ChildNodes.FindNode(ANodes[nodeIndex])) then
begin
node := AParent.OwnerDocument.CreateElement(ANodes[nodeIndex], AParent.NamespaceURI);
AParent.ChildNodes.Add(node);
end;
end;
end;
procedure CreateRequiredAttributes(AParent: IXMLNode; ANodes: array of string);
var
nodeIndex: Integer;
begin
for nodeIndex := Low(ANodes) to High(ANodes) do
begin
if not Assigned(AParent.AttributeNodes.FindNode(ANodes[nodeIndex])) then
AParent.Attributes[ANodes[nodeIndex]] := '';
end;
end;
procedure SortChildNodes(AParent: IXMLNode; ASortOrder: array of string);
var
sortList: TList;
nodeInfo: PSortNodeInfo;
childIndex: Integer;
sortIndex: Integer;
node: IXMLNode;
begin
sortList := TList.Create;
try
{ Build a list of the child nodes, with their original index and the
index in the ASortOrder array. }
for childIndex := 0 to Pred(AParent.ChildNodes.Count) do
begin
New(nodeInfo);
nodeInfo^.Node := AParent.ChildNodes[childIndex];
nodeInfo^.OriginalIndex := childIndex;
for sortIndex := Low(ASortOrder) to High(ASortOrder) do
begin
if ASortOrder[sortIndex] = nodeInfo^.Node.NodeName then
begin
nodeInfo^.SortIndex := sortIndex;
Break;
end;
end;
sortList.Add(nodeInfo);
end;
sortList.Sort(DoSortNodes);
{ Rebuild the ChildNodes list }
for childIndex := 0 to Pred(sortList.Count) do
begin
node := PSortNodeInfo(sortList[childIndex])^.Node;
AParent.ChildNodes.Remove(node);
AParent.ChildNodes.Insert(childIndex, node);
end;
finally
for sortIndex := 0 to Pred(sortList.Count) do
Dispose(PSortNodeInfo(sortList[sortIndex]));
FreeAndNil(sortList);
end;
end;
{ --- JclMime implementation from here. }
// Caution: For MimeEncodeStream and all other kinds of multi-buffered
// Mime encodings (i.e. Files etc.), BufferSize must be set to a multiple of 3.
// Even though the implementation of the Mime decoding routines below
// do not require a particular buffer size, they work fastest with sizes of
// multiples of four. The chosen size is a multiple of 3 and of 4 as well.
// The following numbers are, in addition, also divisible by 1024:
// $2400, $3000, $3C00, $4800, $5400, $6000, $6C00.
const
BUFFER_SIZE = $3000;
EqualSign = Byte('=');
MIME_ENCODE_TABLE: array [0..63] of Byte = (
65, 66, 67, 68, 69, 70, 71, 72, // 00 - 07
73, 74, 75, 76, 77, 78, 79, 80, // 08 - 15
81, 82, 83, 84, 85, 86, 87, 88, // 16 - 23
89, 90, 97, 98, 99, 100, 101, 102, // 24 - 31
103, 104, 105, 106, 107, 108, 109, 110, // 32 - 39
111, 112, 113, 114, 115, 116, 117, 118, // 40 - 47
119, 120, 121, 122, 48, 49, 50, 51, // 48 - 55
52, 53, 54, 55, 56, 57, 43, 47); // 56 - 63
MIME_DECODE_TABLE: array [Byte] of Cardinal = (
255, 255, 255, 255, 255, 255, 255, 255, // 00 - 07
255, 255, 255, 255, 255, 255, 255, 255, // 08 - 15
255, 255, 255, 255, 255, 255, 255, 255, // 16 - 23
255, 255, 255, 255, 255, 255, 255, 255, // 24 - 31
255, 255, 255, 255, 255, 255, 255, 255, // 32 - 39
255, 255, 255, 62, 255, 255, 255, 63, // 40 - 47
52, 53, 54, 55, 56, 57, 58, 59, // 48 - 55
60, 61, 255, 255, 255, 255, 255, 255, // 56 - 63
255, 0, 1, 2, 3, 4, 5, 6, // 64 - 71
7, 8, 9, 10, 11, 12, 13, 14, // 72 - 79
15, 16, 17, 18, 19, 20, 21, 22, // 80 - 87
23, 24, 25, 255, 255, 255, 255, 255, // 88 - 95
255, 26, 27, 28, 29, 30, 31, 32, // 96 - 103
33, 34, 35, 36, 37, 38, 39, 40, // 104 - 111
41, 42, 43, 44, 45, 46, 47, 48, // 112 - 119
49, 50, 51, 255, 255, 255, 255, 255, // 120 - 127
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255);
type
PByte4 = ^TByte4;
TByte4 = packed record
B1: Byte;
B2: Byte;
B3: Byte;
B4: Byte;
end;
PByte3 = ^TByte3;
TByte3 = packed record
B1: Byte;
B2: Byte;
B3: Byte;
end;
//------------------------------------------------------------------------------
// Wrapper functions & procedures
//------------------------------------------------------------------------------
function MimeEncodeString(const S: AnsiString): AnsiString;
var
L: Cardinal;
begin
L := Length(S);
if L > 0 then
begin
SetLength(Result, MimeEncodedSize(L));
MimeEncode(PChar(S)^, L, PChar(Result)^);
end
else
Result := '';
end;
//------------------------------------------------------------------------------
function MimeDecodeString(const S: AnsiString): AnsiString;
var
ByteBuffer, ByteBufferSpace: Cardinal;
L: Cardinal;
begin
L := Length(S);
if L > 0 then
begin
SetLength(Result, MimeDecodedSize(L));
ByteBuffer := 0;
ByteBufferSpace := 4;
L := MimeDecodePartial(PChar(S)^, L, PChar(Result)^, ByteBuffer, ByteBufferSpace);
Inc(L, MimeDecodePartialEnd(PChar(Cardinal(Result) + L)^, ByteBuffer, ByteBufferSpace));
SetLength(Result, L);
end;
end;
//------------------------------------------------------------------------------
procedure MimeEncodeStream(const InputStream: TStream; const OutputStream: TStream);
var
InputBuffer: array [0..BUFFER_SIZE - 1] of Byte;
OutputBuffer: array [0..((BUFFER_SIZE + 2) div 3) * 4 - 1] of Byte;
BytesRead: Integer;
begin
BytesRead := InputStream.Read(InputBuffer, SizeOf(InputBuffer));
while BytesRead > 0 do
begin
MimeEncode(InputBuffer, BytesRead, OutputBuffer);
OutputStream.Write(OutputBuffer, MimeEncodedSize(BytesRead));
BytesRead := InputStream.Read(InputBuffer, SizeOf(InputBuffer));
end;
end;
//------------------------------------------------------------------------------
procedure MimeDecodeStream(const InputStream: TStream; const OutputStream: TStream);
var
ByteBuffer, ByteBufferSpace: Cardinal;
InputBuffer: array [0..(BUFFER_SIZE + 3) div 4 * 3 - 1] of Byte;
OutputBuffer: array [0..BUFFER_SIZE - 1] of Byte;
BytesRead: Integer;
begin
ByteBuffer := 0;
ByteBufferSpace := 4;
BytesRead := InputStream.Read(InputBuffer, SizeOf(InputBuffer));
while BytesRead > 0 do
begin
OutputStream.Write(OutputBuffer, MimeDecodePartial(InputBuffer, BytesRead, OutputBuffer, ByteBuffer, ByteBufferSpace));
BytesRead := InputStream.Read(InputBuffer, SizeOf(InputBuffer));
end;
OutputStream.Write(OutputBuffer, MimeDecodePartialEnd(OutputBuffer, ByteBuffer, ByteBufferSpace));
end;
//------------------------------------------------------------------------------
// Helper functions
//------------------------------------------------------------------------------
function MimeEncodedSize(const I: Cardinal): Cardinal;
begin
Result := (I + 2) div 3 * 4;
end;
//------------------------------------------------------------------------------
function MimeDecodedSize(const I: Cardinal): Cardinal;
begin
Result := (I + 3) div 4 * 3;
end;
//------------------------------------------------------------------------------
// Primary functions & procedures
//------------------------------------------------------------------------------
procedure MimeEncode(var InputBuffer; const InputByteCount: Cardinal; var OutputBuffer);
var
B: Cardinal;
InMax3: Cardinal;
InPtr, InLimitPtr: ^Byte;
OutPtr: PByte4;
begin
if InputByteCount <= 0 then
Exit;
InPtr := @InputBuffer;
InMax3 := InputByteCount div 3 * 3;
OutPTr := @OutputBuffer;
Cardinal(InLimitPtr) := Cardinal(InPtr) + InMax3;
while InPtr <> InLimitPtr do
begin
B := InPtr^;
B := B shl 8;
Inc(InPtr);
B := B or InPtr^;
B := B shl 8;
Inc(InPtr);
B := B or InPtr^;
Inc(InPtr);
// Write 4 bytes to OutputBuffer (in reverse order).
OutPtr.B4 := MIME_ENCODE_TABLE[B and $3F];
B := B shr 6;
OutPtr.B3 := MIME_ENCODE_TABLE[B and $3F];
B := B shr 6;
OutPtr.B2 := MIME_ENCODE_TABLE[B and $3F];
B := B shr 6;
OutPtr.B1 := MIME_ENCODE_TABLE[B];
Inc(OutPtr);
end;
case InputByteCount - InMax3 of
1:
begin
B := InPtr^;
B := B shl 4;
OutPtr.B2 := MIME_ENCODE_TABLE[B and $3F];
B := B shr 6;
OutPtr.B1 := MIME_ENCODE_TABLE[B];
OutPtr.B3 := EqualSign; // Fill remaining 2 bytes.
OutPtr.B4 := EqualSign;
end;
2:
begin
B := InPtr^;
Inc(InPtr);
B := B shl 8;
B := B or InPtr^;
B := B shl 2;
OutPtr.B3 := MIME_ENCODE_TABLE[B and $3F];
B := B shr 6;
OutPTr.b2 := MIME_ENCODE_TABLE[B and $3F];
B := B shr 6;
OutPtr.B1 := MIME_ENCODE_TABLE[B];
OutPtr.B4 := EqualSign; // Fill remaining byte.
end;
end;
end;
//------------------------------------------------------------------------------
function MimeDecode(var InputBuffer; const InputBytesCount: Cardinal; var OutputBuffer): Cardinal;
var
ByteBuffer, ByteBufferSpace: Cardinal;
begin
ByteBuffer := 0;
ByteBufferSpace := 4;
Result := MimeDecodePartial(InputBuffer, InputBytesCount, OutputBuffer, ByteBuffer, ByteBufferSpace);
Inc(Result, MimeDecodePartialEnd(PChar(Cardinal(OutputBuffer) + Result)^, ByteBuffer, ByteBufferSpace));
end;
//------------------------------------------------------------------------------
function MimeDecodePartial(var InputBuffer; const InputBytesCount: Cardinal;
var OutputBuffer; var ByteBuffer: Cardinal; var ByteBufferSpace: Cardinal): Cardinal;
var
lByteBuffer, lByteBufferSpace, C: Cardinal;
InPtr, InLimitPtr: ^Byte;
OutPtr: PByte3;
begin
if InputBytesCount > 0 then
begin
InPtr := @InputBuffer;
Cardinal(InLimitPtr) := Cardinal(InPtr) + InputBytesCount;
OutPtr := @OutputBuffer;
lByteBuffer := ByteBuffer;
lByteBufferSpace := ByteBufferSpace;
while InPtr <> InLimitPtr do
begin
C := MIME_DECODE_TABLE[InPtr^]; // Read from InputBuffer.
Inc(InPtr);
if C = $FF then
Continue;
lByteBuffer := lByteBuffer shl 6;
lByteBuffer := lByteBuffer or C;
Dec(lByteBufferSpace);
if lByteBufferSpace <> 0 then
Continue; // Read 4 bytes from InputBuffer?
OutPtr.B3 := Byte(lByteBuffer); // Write 3 bytes to OutputBuffer (in reverse order).
lByteBuffer := lByteBuffer shr 8;
OutPtr.B2 := Byte(lByteBuffer);
lByteBuffer := lByteBuffer shr 8;
OutPtr.B1 := Byte(lByteBuffer);
lByteBuffer := 0;
Inc(OutPtr);
lByteBufferSpace := 4;
end;
ByteBuffer := lByteBuffer;
ByteBufferSpace := lByteBufferSpace;
Result := Cardinal(OutPtr) - Cardinal(@OutputBuffer);
end
else
Result := 0;
end;
//------------------------------------------------------------------------------
function MimeDecodePartialEnd(var OutputBuffer; const ByteBuffer: Cardinal;
const ByteBufferSpace: Cardinal): Cardinal;
var
lByteBuffer: Cardinal;
begin
case ByteBufferSpace of
1:
begin
lByteBuffer := ByteBuffer shr 2;
PByte3(@OutputBuffer).B2 := Byte(lByteBuffer);
lByteBuffer := lByteBuffer shr 8;
PByte3(@OutputBuffer).B1 := Byte(lByteBuffer);
Result := 2;
end;
2:
begin
lByteBuffer := ByteBuffer shr 4;
PByte3(@OutputBuffer).B1 := Byte(lByteBuffer);
Result := 1;
end;
else
Result := 0;
end;
end;
end.
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