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CCR.Exif.XMPUtils.pas
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CCR.Exif.XMPUtils.pas
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{**************************************************************************************}
{ }
{ CCR Exif - Delphi class library for reading and writing image metadata }
{ Version 1.5.3 }
{ }
{ The contents of this file are subject to the Mozilla Public License Version 1.1 }
{ (the "License"); you may not use this file except in compliance with the License. }
{ You may obtain a copy of the License at http://www.mozilla.org/MPL/ }
{ }
{ Software distributed under the License is distributed on an "AS IS" basis, WITHOUT }
{ WARRANTY OF ANY KIND, either express or implied. See the License for the specific }
{ language governing rights and limitations under the License. }
{ }
{ The Original Code is CCR.Exif.XMPUtils.pas. }
{ }
{ The Initial Developer of the Original Code is Chris Rolliston. Portions created by }
{ Chris Rolliston are Copyright (C) 2009-2014 Chris Rolliston. All Rights Reserved. }
{ }
{**************************************************************************************}
{$I CCR.Exif.inc}
unit CCR.Exif.XMPUtils;
{
This unit implements a IDOMDocument/IDOMNode-based XMP packet parser and editor. Since
v1.1.0, edited data is written out manually (i.e., the IDOMXXX interfaces are only
used to read).
Note that the UpdateXXX methods of TXMPPacket are called automatically when you set a
tag property of TCustomExifData. Their behaviour depends upon the TXMPPacket's
UpdatePolicy property, which has three possible values:
- xwAlwaysUpdate: if the new value is an empty string, then the XMP property is
deleted, else it is changed (or added). This setting is the default for standalone
TXMPPacket instances.
- xwUpdateIfExists: any existing property is updated, but if it doesn't already exist,
no property is added. This setting is the default for an TXMPPacket instance that is
attached to a TCustomExifData object; change this to xwAlwaysUpdate to mimic Windows
Vista's behaviour.
- xwRemove: always removes the property when UpdateProperty is called.
}
interface
uses
Types, SysUtils, Classes, xmldom, CCR.Exif.BaseUtils, CCR.Exif.TiffUtils;
type
EInvalidXMPPacket = class(Exception);
EInvalidXMPOperation = class(EInvalidOperation);
TXMPProperty = class;
TXMPSchema = class;
TXMPPacket = class;
TXMPNamespace = (xsUnknown, xsRDF,
xsCameraRaw, xsColorant, xsDimensions, xsDublinCore, xsFont, xsExif,
xsExifAux, xsIPTC, xsJob, xsMicrosoftPhoto, xsPDF, xsPhotoshop, xsResourceEvent{*},
xsResourceRef{*}, xsThumbnail, xsTIFF, xsVersion, xsXMPBasic, xsXMPBasicJobTicket,
xsXMPDynamicMedia, xsXMPMediaManagement, xsXMPPagedText, xsXMPRights);
TXMPKnownNamespace = xsRDF..High(TXMPNamespace);
TKnownXMPNamespaces = record //personally I wouldn't have the 'T', but I'll keep with the D2009+ style...
private class var
class function GetPreferredPrefix(Namespace: TXMPKnownNamespace): UnicodeString; static;
class function GetURI(Namespace: TXMPKnownNamespace): UnicodeString; static;
public
class function Find(const URI: UnicodeString; out Namespace: TXMPNamespace): Boolean; static;
class property PreferredPrefix[Namespace: TXMPKnownNamespace]: UnicodeString read GetPreferredPrefix;
class property URI[Namespace: TXMPKnownNamespace]: UnicodeString read GetURI;
end;
TXMPNamespaceInfo = class(TPersistent)
strict private
FCustomPrefix: UnicodeString;
FCustomURI: UnicodeString;
FKind: TXMPNamespace;
FOnChange: TNotifyEvent;
procedure Changed;
function GetPrefix: UnicodeString;
function GetURI: UnicodeString;
procedure SetPrefix(const Value: UnicodeString);
protected
constructor Create(AKind: TXMPNamespace;
const APreferredPrefix, AURI: UnicodeString); overload;
procedure DoAssign(Source: TXMPNamespaceInfo); overload;
function DoAssign(const APrefix, AURI: UnicodeString): Boolean; overload;
public
constructor Create(AKind: TXMPKnownNamespace); overload;
constructor Create(const APreferredPrefix, AURI: UnicodeString); overload;
constructor Create(ASource: TXMPNamespaceInfo); overload;
procedure Assign(Source: TPersistent); overload; override;
procedure Assign(AKind: TXMPKnownNamespace); reintroduce; overload;
procedure Assign(const APrefix, AURI: UnicodeString); reintroduce; overload;
property Kind: TXMPNamespace read FKind;
property Prefix: UnicodeString read GetPrefix write SetPrefix;
property URI: UnicodeString read GetURI;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
end;
IXMPPropertyEnumerator = interface
['{32054DDD-5415-4F5D-8A38-C79BBCFD1A50}']
function GetCurrent: TXMPProperty;
function MoveNext: Boolean;
property Current: TXMPProperty read GetCurrent;
end;
IXMPPropertyCollection = interface
['{A72E8B43-34AE-49E8-A889-36B51B6A6E48}']
function GetNamespaceInfo: TXMPNamespaceInfo;
function GetProperty(Index: Integer): TXMPProperty;
function GetPropertyCount: Integer;
function GetEnumerator: IXMPPropertyEnumerator;
property Count: Integer read GetPropertyCount;
property Items[Index: Integer]: TXMPProperty read GetProperty; default;
property NamespaceInfo: TXMPNamespaceInfo read GetNamespaceInfo;
end;
TXMPPropertyKind = (xpSimple, xpStructure, xpAltArray, xpBagArray, xpSeqArray);
TXMPProperty = class(TInterfacedPersistent, IXMPPropertyCollection)
strict private
FKind: TXMPPropertyKind;
FName: UnicodeString;
FNamespaceInfo: TXMPNamespaceInfo;
FParentNamespace: Boolean;
FParentProperty: TXMPProperty;
FSchema: TXMPSchema;
FSubProperties: TObjectList;
FValue: UnicodeString;
procedure NamespaceInfoChanged(Sender: TObject);
procedure SetKind(const Value: TXMPPropertyKind);
procedure SetName(const Value: UnicodeString);
procedure SetParentNamespace(Value: Boolean);
procedure SetSubPropertyCount(NewCount: Integer);
protected
procedure Changed;
function GetNamespaceInfo: TXMPNamespaceInfo;
function GetSubProperty(Index: Integer): TXMPProperty;
function GetSubPropertyByName(const AName: UnicodeString): TXMPProperty;
function GetSubPropertyCount: Integer;
function IXMPPropertyCollection.GetProperty = GetSubProperty;
function IXMPPropertyCollection.GetPropertyCount = GetSubPropertyCount;
public
class function HasNamedSubProperties(Kind: TXMPPropertyKind): Boolean; overload; static; inline;
class function SupportsSubProperties(Kind: TXMPPropertyKind): Boolean; overload; static; inline;
public
constructor Create(ASchema: TXMPSchema; AParentProperty: TXMPProperty;
const ASourceNode: IDOMNode = nil);
destructor Destroy; override;
function GetEnumerator: IXMPPropertyEnumerator;
function AddSubProperty(const AName: UnicodeString): TXMPProperty; //AName is ignored if self is an array property
function FindSubProperty(const AName: UnicodeString; out Prop: TXMPProperty): Boolean;
function ReadValue(const Default: Boolean): Boolean; overload;
function ReadValue(const Default: Integer): Integer; overload;
function ReadValue(const Default: TDateTime): TDateTime; overload;
function ReadValue(const Default: UnicodeString = ''): UnicodeString; overload;
function RemoveSubProperty(const AName: UnicodeString): Boolean;
function HasNamedSubProperties: Boolean; overload;
function SupportsSubProperties: Boolean; overload;
procedure UpdateSubProperty(const SubPropName: UnicodeString;
SubPropKind: TXMPPropertyKind; const NewValue: UnicodeString); overload;
procedure UpdateSubProperty(const SubPropName, NewValue: UnicodeString); overload; inline;
procedure UpdateSubProperty(const SubPropName: UnicodeString; NewValue: Integer); overload;
procedure UpdateSubProperty(const SubPropName: UnicodeString; NewValue: Boolean); overload;
procedure WriteValue(const NewValue: UnicodeString); overload;
procedure WriteValue(const NewValue: TDateTime); overload;
procedure WriteValue(const NewValue: Integer); overload;
procedure WriteValue(const NewValue: Boolean); overload;
property Kind: TXMPPropertyKind read FKind write SetKind;
property Name: UnicodeString read FName write SetName;
property NamespaceInfo: TXMPNamespaceInfo read FNamespaceInfo;
property ParentNamespace: Boolean read FParentNameSpace write SetParentNamespace default True;
property ParentProperty: TXMPProperty read FParentProperty;
property Schema: TXMPSchema read FSchema;
property SubProperties[const Name: UnicodeString]: TXMPProperty read GetSubPropertyByName; default; //adds if necessary
property SubProperties[Index: Integer]: TXMPProperty read GetSubProperty; default;
property SubPropertyCount: Integer read GetSubPropertyCount write SetSubPropertyCount;
end;
TXMPSchema = class(TInterfacedPersistent, IXMPPropertyCollection)
strict private
FLoadingProperty: Boolean;
FNamespaceInfo: TXMPNamespaceInfo;
FOwner: TXMPPacket;
FProperties: TObjectList;
procedure NamespaceInfoChanged(Sender: TObject);
protected
function LoadProperty(const ASourceNode: IDOMNode): TXMPProperty;
procedure Changed;
function FindOrAddProperty(const AName: UnicodeString): TXMPProperty;
function GetNamespaceInfo: TXMPNamespaceInfo;
function GetOwner: TPersistent; override;
function GetProperty(Index: Integer): TXMPProperty;
function GetPropertyCount: Integer;
public
constructor Create(AOwner: TXMPPacket; const AURI: UnicodeString);
destructor Destroy; override;
function GetEnumerator: IXMPPropertyEnumerator;
function AddProperty(const AName: UnicodeString): TXMPProperty;
function FindProperty(const AName: UnicodeString; var AProperty: TXMPProperty): Boolean;
function RemoveProperty(const AName: UnicodeString): Boolean;
function RemoveProperties(const ANames: array of UnicodeString): Boolean;
property NamespaceInfo: TXMPNamespaceInfo read FNamespaceInfo;
property Owner: TXMPPacket read FOwner;
property Properties[const Name: UnicodeString]: TXMPProperty read FindOrAddProperty; default;
property Properties[Index: Integer]: TXMPProperty read GetProperty; default;
property PropertyCount: Integer read GetPropertyCount;
end;
TXMPWritePolicy = (xwAlwaysUpdate, xwUpdateIfExists, xwRemove);
TXMPPacket = class(TComponent, IStreamPersist, IStreamPersistEx, ITiffRewriteCallback)
public type
TEnumerator = record
private
FIndex: Integer;
FPacket: TXMPPacket;
function GetCurrent: TXMPSchema;
public
constructor Create(Packet: TXMPPacket);
function MoveNext: Boolean;
property Current: TXMPSchema read GetCurrent;
end;
TLoadErrorEvent = procedure (Sender: TXMPPacket; Source: TStream) of object;
strict private
FAboutAttributeValue: UnicodeString;
FDataToLazyLoad: IMetadataBlock;
FRawXMLCache: UTF8String;
FSchemas: TUnicodeStringList;
FTiffRewriteCallback: TSimpleTiffRewriteCallbackImpl;
FUpdatePolicy: TXMPWritePolicy;
FOnChange: TNotifyEvent;
FOnLoadError: TLoadErrorEvent;
procedure Clear(StillUpdating: Boolean); overload;
procedure GetGraphicSaveMethod(Stream: TStream; var Method: TGraphicSaveMethod);
function GetRawXML: UTF8String;
function GetSchema(Index: Integer): TXMPSchema;
function GetSchemaCount: Integer;
procedure SetAboutAttributeValue(const Value: UnicodeString);
procedure SetDataToLazyLoad(const Value: IMetadataBlock);
procedure SetRawXML(const XML: UTF8String);
procedure DoSaveToJPEG(InStream, OutStream: TStream); inline;
procedure DoSaveToPSD(InStream, OutStream: TStream);
procedure DoSaveToTIFF(InStream, OutStream: TStream);
procedure DoUpdateProperty(Policy: TXMPWritePolicy; SchemaKind: TXMPKnownNamespace;
const PropName: UnicodeString; PropKind: TXMPPropertyKind; const NewValue: UnicodeString);
procedure DoUpdateArrayProperty(SchemaKind: TXMPKnownNamespace;
const PropName: UnicodeString; ArrayPropKind: TXMPPropertyKind;
const NewValues: array of UnicodeString); overload;
protected
procedure AssignTo(Dest: TPersistent); override;
procedure Changed(AResetRawXMLCache: Boolean = True); virtual;
function FindOrAddSchema(const URI: UnicodeString): TXMPSchema; overload;
function FindOrAddSchema(Kind: TXMPKnownNamespace): TXMPSchema; overload; inline;
function GetEmpty: Boolean; inline;
procedure LoadError(Source: TStream); virtual;
procedure NeedLazyLoadedData;
property UpdatePolicy: TXMPWritePolicy read FUpdatePolicy write FUpdatePolicy;
property TiffRewriteCallback: TSimpleTiffRewriteCallbackImpl read FTiffRewriteCallback implements ITiffRewriteCallback;
public
constructor Create(AOwner: TComponent = nil); override;
class function CreateAsSubComponent(AOwner: TComponent): TXMPPacket; //use a class function rather than a constructor to avoid compiler warning re C++ accessibility
destructor Destroy; override;
procedure Assign(Source: TPersistent); override;
procedure Clear; overload; inline;
function FindSchema(const URI: UnicodeString; var Schema: TXMPSchema): Boolean; overload;
function FindSchema(Kind: TXMPKnownNamespace; var Schema: TXMPSchema): Boolean; overload; inline;
function GetEnumerator: TEnumerator;
procedure LoadFromFile(const FileName: string);
procedure LoadFromStream(Stream: TStream);
{ Whether or not metadata was found, LoadFromGraphic returns True if the graphic
format was one recognised as one we could extract XMP data from and False otherwise. }
function LoadFromGraphic(Stream: TStream): Boolean; overload;
function LoadFromGraphic(const Graphic: IStreamPersist): Boolean; overload;
function LoadFromGraphic(const FileName: string): Boolean; overload;
procedure SaveToFile(const FileName: string);
procedure SaveToGraphic(const FileName: string); overload;
procedure SaveToGraphic(const Graphic: IStreamPersist); overload;
procedure SaveToStream(Stream: TStream);
function TryLoadFromStream(Stream: TStream): Boolean;
procedure ResetRawXMLCache;
procedure RemoveProperty(SchemaKind: TXMPKnownNamespace;
const PropName: UnicodeString); overload;
procedure RemoveProperties(SchemaKind: TXMPKnownNamespace;
const PropNames: array of UnicodeString); overload;
procedure UpdateProperty(SchemaKind: TXMPKnownNamespace; const PropName: UnicodeString;
PropKind: TXMPPropertyKind; const NewValue: UnicodeString); overload;
procedure UpdateBagProperty(SchemaKind: TXMPKnownNamespace; const PropName: UnicodeString;
const NewValues: array of UnicodeString); overload;
procedure UpdateBagProperty(SchemaKind: TXMPKnownNamespace; const PropName: UnicodeString;
const NewValueList: UnicodeString); overload; inline; //commas and/or semi-colons act as delimiters
procedure UpdateSeqProperty(SchemaKind: TXMPKnownNamespace; const PropName: UnicodeString;
const NewValues: array of UnicodeString); overload;
procedure UpdateSeqProperty(SchemaKind: TXMPKnownNamespace; const PropName: UnicodeString;
const NewValueList: UnicodeString); overload; inline; //commas and/or semi-colons act as delimiters
procedure UpdateProperty(SchemaKind: TXMPKnownNamespace;
const PropName, NewValue: UnicodeString); overload; inline;
procedure UpdateProperty(SchemaKind: TXMPKnownNamespace;
const PropName: UnicodeString; const NewValue: Integer); overload;
procedure UpdateDateTimeProperty(SchemaKind: TXMPKnownNamespace;
const PropName: UnicodeString; const NewValue: TDateTimeTagValue; ApplyLocalBias: Boolean = True); overload;
property AboutAttributeValue: UnicodeString read FAboutAttributeValue write SetAboutAttributeValue;
property DataToLazyLoad: IMetadataBlock read FDataToLazyLoad write SetDataToLazyLoad;
property Schemas[Kind: TXMPKnownNamespace]: TXMPSchema read FindOrAddSchema; default;
property Schemas[Index: Integer]: TXMPSchema read GetSchema; default;
property Schemas[const URI: UnicodeString]: TXMPSchema read FindOrAddSchema; default;
{ TCustomIniFile-like value getters and setters for convenience }
function ReadBool(SchemaKind: TXMPKnownNamespace; const PropertyName: string; DefValue: Boolean): Boolean; overload;
function ReadBool(const SchemaURI: string; const PropertyName: string; DefValue: Boolean): Boolean; overload;
function ReadDateTime(SchemaKind: TXMPKnownNamespace; const PropertyName: string; const DefValue: TDateTime): TDateTime; overload;
function ReadDateTime(const SchemaURI: string; const PropertyName: string; const DefValue: TDateTime): TDateTime; overload;
function ReadInteger(SchemaKind: TXMPKnownNamespace; const PropertyName: string; DefValue: Integer): Integer; overload;
function ReadInteger(const SchemaURI: string; const PropertyName: string; DefValue: Integer): Integer; overload;
function ReadString(SchemaKind: TXMPKnownNamespace; const PropertyName: string; const DefValue: string): string; overload;
function ReadString(const SchemaURI: string; const PropertyName: string; const DefValue: string): string; overload;
procedure WriteBool(SchemaKind: TXMPKnownNamespace; const PropertyName: string; Value: Boolean); overload; inline;
procedure WriteBool(const SchemaURI: string; const PropertyName: string; Value: Boolean); overload; inline;
procedure WriteDateTime(SchemaKind: TXMPKnownNamespace; const PropertyName: string; const Value: TDateTime); overload; inline;
procedure WriteDateTime(const SchemaURI: string; const PropertyName: string; const Value: TDateTime); overload; inline;
procedure WriteInteger(SchemaKind: TXMPKnownNamespace; const PropertyName: string; Value: Integer); overload; inline;
procedure WriteInteger(const SchemaURI: string; const PropertyName: string; Value: Integer); overload; inline;
procedure WriteString(SchemaKind: TXMPKnownNamespace; const PropertyName: string; const Value: string); overload; inline;
procedure WriteString(const SchemaURI: string; const PropertyName: string; const Value: string); overload; inline;
published
property Empty: Boolean read GetEmpty;
property RawXML: UTF8String read GetRawXML write SetRawXML;
property SchemaCount: Integer read GetSchemaCount;
property OnChange: TNotifyEvent read FOnChange write FOnChange;
property OnLoadError: TLoadErrorEvent read FOnLoadError write FOnLoadError;
end;
const
XMPBoolStrs: array[Boolean] of string = ('False', 'True'); //case as per the XMP spec
function DateTimeToXMPString(const Value: TDateTime; ApplyLocalBias: Boolean = True): UnicodeString;
function XMPStringToDateTime(const Value: string; AsUTCTime: Boolean = False): TDateTime;
function EscapeXML(const Source: UnicodeString): UnicodeString;
implementation
uses
{$IFDEF HasTTimeZone}TimeSpan{$ELSE}Windows{$ENDIF}, Math, RTLConsts, SysConst, DateUtils, StrUtils,
CCR.Exif.Consts, CCR.Exif.TagIDs, CCR.Exif.StreamHelper;
const
XMLLangAttrName = 'xml:lang';
DefaultLangIdent = 'x-default';
type
RDF = record const
URI = UnicodeString('http://www.w3.org/1999/02/22-rdf-syntax-ns#');
PreferredPrefix = 'rdf';
AboutAttrLocalName = 'about';
AboutAttrName = PreferredPrefix + ':' + AboutAttrLocalName;
AltNodeName = PreferredPrefix + ':' + 'Alt';
BagNodeName = PreferredPrefix + ':' + 'Bag';
DescriptionNodeName = PreferredPrefix + ':' + 'Description';
ListNodeLocalName = 'li';
ListNodeName = PreferredPrefix + ':' + ListNodeLocalName;
SeqNodeName = PreferredPrefix + ':' + 'Seq';
end;
TStringListThatOwnsItsObjects = class(TUnicodeStringList)
public
destructor Destroy; override;
procedure Clear; override;
procedure Delete(Index: Integer); override;
end;
TXMPPropertyEnumerator = class(TInterfacedObject, IXMPPropertyEnumerator)
strict private
FIndex: Integer;
FSource: TObjectList;
protected
function GetCurrent: TXMPProperty;
function MoveNext: Boolean;
public
constructor Create(Source: TObjectList);
end;
const
KnownURIs: array[TXMPKnownNamespace] of string = (
RDF.URI,
'http://ns.adobe.com/camera-raw-settings/1.0/',
'http://ns.adobe.com/xap/1.0/g',
'http://ns.adobe.com/xap/1.0/sType/Dimensions#',
'http://purl.org/dc/elements/1.1/',
'http://ns.adobe.com/xap/1.0/sType/Font#',
'http://ns.adobe.com/exif/1.0/',
'http://ns.adobe.com/exif/1.0/aux/',
'http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/',
'http://ns.adobe.com/xap/1.0/sType/Job#',
'http://ns.microsoft.com/photo/1.0',
'http://ns.adobe.com/pdf/1.3/',
'http://ns.adobe.com/photoshop/1.0/',
'http://ns.adobe.com/xap/1.0/sType/ResourceEvent#',
'http://ns.adobe.com/xap/1.0/sType/ResourceRef#',
'http://ns.adobe.com/xap/1.0/g/img/',
'http://ns.adobe.com/tiff/1.0/',
'http://ns.adobe.com/xap/1.0/sType/Version#',
'http://ns.adobe.com/xap/1.0/',
'http://ns.adobe.com/xap/1.0/bj/',
'http://ns.adobe.com/xmp/1.0/DynamicMedia/',
'http://ns.adobe.com/xap/1.0/mm/',
'http://ns.adobe.com/xap/1.0/t/pg/',
'http://ns.adobe.com/xap/1.0/rights/');
PreferredPrefixes: array[TXMPKnownNamespace] of string = (
{xsRDF} RDF.PreferredPrefix,
{xsCameraRaw} 'crs',
{xsColorant} 'xmpG',
{xsDimensions} 'stDim',
{xsDublinCore} 'dc',
{xsFont} 'stFnt',
{xsExif} 'exif',
{xsExifAux} 'aux',
{xsIPTC} 'Iptc4xmpCore',
{xsJob} 'stJob',
{xsMicrosoftPhoto} 'MicrosoftPhoto',
{xsPDF} 'pdf',
{xsPhotoshop} 'photoshop',
{xsResourceEvent} 'stEvt',
{xsResourceRef} 'stRef',
{xsThumbnail} 'xmpGImg',
{xsTIFF} 'tiff',
{xsVersion} 'stVer',
{xsXMPBasic} 'xmp',
{xsXMPBasicJobTicket} 'xmpBJ',
{xsXMPDynamicMedia} 'xmpDM',
{xsXMPMediaManagement} 'xmpMM',
{xsXMPPagedText} 'xmpTPg',
{xsXMPRights} 'xmpRights');
function GetUTCOffset(const Value: TDateTime; out AHours, AMins: Integer): Int64;
{$IFDEF HasTTimeZone}
begin
with TTimeZone.Local.GetUTCOffset(Value) do
begin
Result := Ticks;
AHours := Hours;
AMins := Minutes;
end;
{$ELSE} {$J+}
const
UseNewAPI: (Maybe, No, Yes) = Maybe;
GetTimeZoneInformationForYear: function(wYear: Word; DynInfo: Pointer;
var TZInfo: TTimeZoneInformation): BOOL; stdcall = nil;
TzSpecificLocalTimeToSystemTime: function(var TZInfo: TTimeZoneInformation;
const LocalTime: TSystemTime; out UTCTime: TSystemTime): BOOL; stdcall = nil;
var
DoFallback: Boolean;
LocalTime, UTCTime: TSystemTime;
TimeZoneInfo: TTimeZoneInformation;
begin
Result := 0;
DoFallback := True;
if UseNewAPI = Maybe then
begin
GetTimeZoneInformationForYear := GetProcAddress(GetModuleHandle(kernel32), 'GetTimeZoneInformationForYear');
TzSpecificLocalTimeToSystemTime := GetProcAddress(GetModuleHandle(kernel32), 'TzSpecificLocalTimeToSystemTime');
if Assigned(GetTimeZoneInformationForYear) and Assigned(TzSpecificLocalTimeToSystemTime) then
UseNewAPI := Yes
else
UseNewAPI := No;
end;
if UseNewAPI = Yes then
begin
DateTimeToSystemTime(Value, LocalTime);
if GetTimeZoneInformationForYear(LocalTime.wYear, nil, TimeZoneInfo) then
if TzSpecificLocalTimeToSystemTime(TimeZoneInfo, LocalTime, UTCTime) then
begin
Result := Round(MinsPerDay * (Value - SystemTimeToDateTime(UTCTime)));
DoFallback := False;
end;
end;
if DoFallback then
case GetTimeZoneInformation(TimeZoneInfo) of
TIME_ZONE_ID_UNKNOWN: Result := TimeZoneInfo.Bias;
TIME_ZONE_ID_STANDARD: Result := TimeZoneInfo.Bias + TimeZoneInfo.StandardBias;
TIME_ZONE_ID_DAYLIGHT: Result := TimeZoneInfo.Bias + TimeZoneInfo.DaylightBias;
end;
AHours := Abs(Result) div MinsPerHour;
AMins := Abs(Result) mod MinsPerHour;
{$ENDIF}
end;
function DateTimeToXMPString(const Value: TDateTime; ApplyLocalBias: Boolean): UnicodeString;
const
PlusNegSyms: array[Boolean] of string = ('-', '+');
var
Hours, Mins: Integer;
begin
Result := FormatDateTime('yyyy''-''mm''-''dd''T''hh'':''nn'':''ss''.''zzz', Value);
if ApplyLocalBias then
Result := Format('%s%s%.2d:%.2d', [Result,
PlusNegSyms[GetUTCOffset(Value, Hours, Mins) >= 0], Hours, Mins]);
end;
function XMPStringToDateTime(const Value: string; AsUTCTime: Boolean = False): TDateTime;
var
SeekPtr: PChar;
function ReadDigit: Byte;
begin
case SeekPtr^ of
'0'..'9': Result := Ord(SeekPtr^) - Ord('0');
else raise EConvertError.CreateResFmt(@SInvalidInteger, [string(SeekPtr^)]);
end;
Inc(SeekPtr);
end;
function Read2Digits: Word;
begin
Result := ReadDigit * 10 + ReadDigit;
end;
function Read4Digits: Word;
begin
Result := ReadDigit * 1000 + ReadDigit * 100 + ReadDigit * 10 + ReadDigit;
end;
function Read2DigitsAfter(CharsToSkip: Integer): Word;
begin
Inc(SeekPtr, CharsToSkip);
Result := ReadDigit * 10 + ReadDigit;
end;
var
Minus: Boolean;
Year, Month, Day, Hour, Min, Sec, MSecs: Integer;
Offset: TDateTime;
begin
SeekPtr := PChar(Value);
Year := Read4Digits;
Month := Read2DigitsAfter(1);
Day := Read2DigitsAfter(1);
Result := EncodeDate(Year, Month, Day);
if SeekPtr^ = #0 then Exit;
Hour := Read2DigitsAfter(1);
Min := Read2DigitsAfter(1);
Sec := Read2DigitsAfter(1);
MSecs := 0;
if SeekPtr^ = '.' then
begin
Inc(SeekPtr);
repeat
MSecs := MSecs * 10 + ReadDigit;
until CharInSet(SeekPtr^, [#0, 'Z', 'z', '-', '+']);
end;
Result := Result + EncodeTime(Hour, Min, Sec, MSecs);
if AsUTCTime then Exit;
case SeekPtr^ of
#0, 'Z', 'z': Exit;
'-': Minus := True;
'+': Minus := False;
else raise EConvertError.CreateResFmt(@SInvalidDateTime, [Value]);
end;
Hour := Read2DigitsAfter(1);
Min := Read2DigitsAfter(1);
Offset := EncodeTime(Hour, Min, 0, 0);
if Minus then
Result := Result - Offset
else
Result := Result + Offset;
end;
function DefinesNS(const Attr: IDOMNode): Boolean;
begin
Result := (Attr.prefix = 'xmlns') or (Attr.namespaceURI = 'http://www.w3.org/2000/xmlns/');
end;
function EscapeXML(const Source: UnicodeString): UnicodeString;
var
Ch: WideChar;
begin
with TMemoryStream.Create do
try
for Ch in Source do
case Ch of
'<': WriteWideChars('<', SmallEndian);
'>': WriteWideChars('>', SmallEndian);
'&': WriteWideChars('&', SmallEndian);
'''': WriteWideChars(''', SmallEndian);
'"': WriteWideChars('"', SmallEndian);
else WriteBuffer(Ch, 2);
end;
SetString(Result, PWideChar(Memory), Size div 2);
finally
Free;
end;
end;
function FindRootRDFNode(const Document: IDOMDocument; out Node: IDOMNode): Boolean;
begin
Result := True;
Node := Document.firstChild;
while Node <> nil do
begin
if Node.nodeType = ELEMENT_NODE then
case IndexStr(Node.localName, ['RDF', 'xmpmeta', 'xapmeta']) of
0: Exit; //support ExifTool's XML dumps, which don't parent the RDF node
1..2: Break;
end;
Node := Node.nextSibling;
end;
if Node <> nil then
begin
Node := Node.firstChild;
while Node <> nil do
begin
if (Node.nodeName = 'rdf:RDF') and (Node.nodeType = ELEMENT_NODE) then Break;
Node := Node.nextSibling;
end;
end;
Result := (Node <> nil);
end;
function HasXMPSegmentHeader(Stream: TStream): Boolean;
begin
Result := Stream.TryReadHeader(TJPEGSegment.XMPHeader, SizeOf(TJPEGSegment.XMPHeader), True);
end;
procedure UpdateChildNamespaceInfos(const Parent: IXMPPropertyCollection);
var
Prop: TXMPProperty;
begin
for Prop in Parent do
if Prop.ParentNamespace then
begin
Prop.NamespaceInfo.DoAssign(Parent.NamespaceInfo);
UpdateChildNamespaceInfos(Prop);
end;
end;
{ TKnownXMPNamespaces }
class function TKnownXMPNamespaces.GetPreferredPrefix(Namespace: TXMPKnownNamespace): UnicodeString;
begin
Result := PreferredPrefixes[Namespace];
end;
class function TKnownXMPNamespaces.GetURI(Namespace: TXMPKnownNamespace): UnicodeString;
begin
Result := KnownURIs[Namespace];
end;
class function TKnownXMPNamespaces.Find(const URI: UnicodeString; out Namespace: TXMPNamespace): Boolean;
var
I: TXMPKnownNamespace;
begin
for I := Low(KnownURIs) to High(KnownURIs) do
if URI = KnownURIs[I] then
begin
Namespace := I;
Result := True;
Exit;
end;
Namespace := xsUnknown;
Result := False;
end;
{ TStringListThatOwnsItsObjects }
destructor TStringListThatOwnsItsObjects.Destroy;
begin
Clear;
inherited;
end;
procedure TStringListThatOwnsItsObjects.Clear;
var
I: Integer;
begin
for I := Count - 1 downto 0 do
{$IFDEF NEXTGEN}
Objects[I].DisposeOf;
{$ELSE}
Objects[I].Free;
{$ENDIF}
inherited;
end;
procedure TStringListThatOwnsItsObjects.Delete(Index: Integer);
begin
{$IFDEF NEXTGEN}
Objects[Index].DisposeOf;
{$ELSE}
Objects[Index].Free;
{$ENDIF}
inherited;
end;
{ TXMPPropertyEnumerator }
constructor TXMPPropertyEnumerator.Create(Source: TObjectList);
begin
FIndex := -1;
FSource := Source;
end;
function TXMPPropertyEnumerator.GetCurrent: TXMPProperty;
begin
Result := TXMPProperty(FSource[FIndex]);
end;
function TXMPPropertyEnumerator.MoveNext: Boolean;
begin
Inc(FIndex);
Result := (FIndex < FSource.Count);
end;
{ TXMPNamespaceInfo }
constructor TXMPNamespaceInfo.Create(AKind: TXMPNamespace;
const APreferredPrefix, AURI: UnicodeString);
begin
inherited Create;
FKind := AKind;
FCustomPrefix := APreferredPrefix;
FCustomURI := AURI;
end;
constructor TXMPNamespaceInfo.Create(AKind: TXMPKnownNamespace);
begin
Create(AKind, '', '');
end;
constructor TXMPNamespaceInfo.Create(const APreferredPrefix, AURI: UnicodeString);
begin
Create(xsUnknown, APreferredPrefix, AURI);
end;
constructor TXMPNamespaceInfo.Create(ASource: TXMPNamespaceInfo);
begin
inherited Create;
Assign(ASource);
end;
procedure TXMPNamespaceInfo.Assign(Source: TPersistent);
begin
if Source is TXMPNamespaceInfo then
begin
DoAssign(TXMPNamespaceInfo(Source));
Changed;
Exit;
end;
inherited;
end;
procedure TXMPNamespaceInfo.Assign(AKind: TXMPKnownNamespace);
begin
if FKind = AKind then Exit;
FCustomPrefix := '';
FCustomURI := '';
FKind := AKind;
Changed;
end;
procedure TXMPNamespaceInfo.Assign(const APrefix, AURI: UnicodeString);
begin
if DoAssign(APrefix, AURI) then Changed;
end;
procedure TXMPNamespaceInfo.Changed;
begin
if Assigned(FOnChange) then FOnChange(Self);
end;
procedure TXMPNamespaceInfo.DoAssign(Source: TXMPNamespaceInfo);
begin
FCustomPrefix := Source.FCustomPrefix;
FCustomURI := Source.FCustomURI;
FKind := Source.FKind;
end;
function TXMPNamespaceInfo.DoAssign(const APrefix, AURI: UnicodeString): Boolean;
begin
Result := (AURI <> URI) or (APrefix <> Prefix);
if not Result then Exit;
if TKnownXMPNamespaces.Find(AURI, FKind) and (AURI = TKnownXMPNamespaces.PreferredPrefix[FKind]) then
begin
FCustomPrefix := '';
FCustomURI := '';
end
else
begin
FCustomPrefix := APrefix;
FCustomURI := AURI;
end;
end;
function TXMPNamespaceInfo.GetPrefix: UnicodeString;
begin
if (FCustomPrefix <> '') or (FKind = xsUnknown) then
Result := FCustomPrefix
else
Result := TKnownXMPNamespaces.PreferredPrefix[FKind];
end;
function TXMPNamespaceInfo.GetURI: UnicodeString;
begin
if FKind = xsUnknown then
Result := FCustomURI
else
Result := TKnownXMPNamespaces.URI[FKind];
end;
procedure TXMPNamespaceInfo.SetPrefix(const Value: UnicodeString);
begin
if Value = Prefix then Exit;
FCustomPrefix := Value;
Changed;
end;
{ TXMPProperty }
class function TXMPProperty.HasNamedSubProperties(Kind: TXMPPropertyKind): Boolean;
begin
Result := (Kind in [xpStructure, xpAltArray]);
end;
class function TXMPProperty.SupportsSubProperties(Kind: TXMPPropertyKind): Boolean;
begin
Result := (Kind in [xpAltArray, xpBagArray, xpSeqArray, xpStructure]);
end;
constructor TXMPProperty.Create(ASchema: TXMPSchema; AParentProperty: TXMPProperty;
const ASourceNode: IDOMNode);
procedure UseSourceNodeNameAndNamespace;
begin
FName := ASourceNode.localName;
if FNamespaceInfo.DoAssign(ASourceNode.prefix, ASourceNode.namespaceURI) then
FParentNamespace := False;
end;
var
Attrs: IDOMNamedNodeMap;
ChildNode, DataNode, TextNode: IDOMNode;
DoAdd: Boolean;
I: Integer;
PropAndNodeStructure: Boolean;
S: string;
SourceAsElem: IDOMElement;
begin
inherited Create;
FParentNamespace := True;
FNamespaceInfo := TXMPNamespaceInfo.Create(ASchema.NamespaceInfo);
if AParentProperty <> nil then
FNamespaceInfo.DoAssign(AParentProperty.NamespaceInfo)
else if ASchema <> nil then
FNamespaceInfo.DoAssign(ASchema.NamespaceInfo)
else
FParentNamespace := False;
FParentProperty := AParentProperty;
FSchema := ASchema;
FSubProperties := TObjectList.Create;
if ASourceNode = nil then Exit;
//figure out our kind
PropAndNodeStructure := Supports(ASourceNode, IDOMElement, SourceAsElem) and
(SourceAsElem.getAttributeNS(RDF.URI, 'parseType') = 'Resource'); //http://www.w3.org/TR/REC-rdf-syntax/#section-Syntax-parsetype-resource
if PropAndNodeStructure then
begin
FKind := xpStructure;
DataNode := ASourceNode;
end
else
begin
DataNode := ASourceNode.firstChild;
if DataNode <> nil then
begin
repeat
{ Originally, this loop was exited as soon as a text node was found. This
however doesn't work with the ADOM backend (as used by default on OS X)
because ADOM can intepret whitespace prior to a child element as a text
node of the parent. }
case DataNode.nodeType of
TEXT_NODE: TextNode := DataNode;
ELEMENT_NODE:
begin
S := DataNode.nodeName;
if S = RDF.AltNodeName then
FKind := xpAltArray
else if S = RDF.BagNodeName then
FKind := xpBagArray
else if S = RDF.SeqNodeName then
FKind := xpSeqArray
else if S = RDF.DescriptionNodeName then
FKind := xpStructure;
Break;
end;
end;
DataNode := DataNode.nextSibling;
until (DataNode = nil);
if DataNode = nil then DataNode := TextNode;
end;
end;
{ Get the value, if appropriate, and check for super-inlined structures. For life of
me I can't see where in the XMP spec the latter are allowed - cf. p.19 of the spec
pt.1 PDF), but Adobe's XMP Toolkit can output them, at least in v4.x. }
if FKind = xpSimple then
if DataNode <> nil then
FValue := DataNode.nodeValue
else if ASourceNode.attributes <> nil then
begin
Attrs := ASourceNode.attributes;
for I := 0 to Attrs.length - 1 do
if not DefinesNS(Attrs[I]) then
begin
DataNode := ASourceNode;
FKind := xpStructure;
Break;
end;
end;
//get the name
if ParentProperty = nil then
UseSourceNodeNameAndNamespace
else
case ParentProperty.Kind of
xpBagArray, xpSeqArray: FName := '';
xpAltArray:
if SourceAsElem <> nil then
begin
FName := SourceAsElem.getAttribute(XMLLangAttrName);
if FName = '' then //fix for ADOM
for I := SourceAsElem.attributes.length - 1 downto 0 do
if SourceAsElem.attributes[I].nodeName = XMLLangAttrName then
begin
FName := SourceAsElem.attributes[I].nodeValue;
Break;
end;
end
else
FName := '';
else UseSourceNodeNameAndNamespace;
end;
//load any sub-props
if not SupportsSubProperties then Exit;
Assert(DataNode <> nil);
Attrs := DataNode.attributes;
if (FKind = xpStructure) and not PropAndNodeStructure and (Attrs <> nil) then
begin
FSubProperties.Capacity := Attrs.length;
for I := 0 to FSubProperties.Capacity - 1 do
begin
ChildNode := Attrs[I];
if not DefinesNS(ChildNode) then
FSubProperties.Add(TXMPProperty.Create(Schema, Self, ChildNode));
end;
end;
FSubProperties.Capacity := FSubProperties.Count + DataNode.childNodes.length;
ChildNode := DataNode.firstChild;
while ChildNode <> nil do
begin
DoAdd := False;
if ChildNode.nodeType = ELEMENT_NODE then
begin
if FKind = xpStructure then
DoAdd := True
else if ChildNode.nodeName = RDF.ListNodeName then
if (FKind <> xpAltArray) or (ChildNode.attributes.getNamedItem(XMLLangAttrName) <> nil) then
DoAdd := True
else //fix for ADOM added v1.5.2
for I := ChildNode.attributes.length - 1 downto 0 do
if ChildNode.attributes[I].nodeName = XMLLangAttrName then
begin
DoAdd := True;
Break;
end;
end;
if DoAdd then
FSubProperties.Add(TXMPProperty.Create(Schema, Self, ChildNode));
ChildNode := ChildNode.nextSibling;
end;
FNamespaceInfo.OnChange := NamespaceInfoChanged;
end;
destructor TXMPProperty.Destroy;
begin
FNamespaceInfo.Free;
FSubProperties.Free;
inherited;
end;
function TXMPProperty.AddSubProperty(const AName: UnicodeString): TXMPProperty;
begin
if not SupportsSubProperties then
raise EInvalidXMPOperation.CreateRes(@SSubPropertiesNotSupported);
if HasNamedSubProperties and (AName = '') then
raise EInvalidXMPOperation.CreateRes(@SSubPropertiesMustBeNamed);
Result := TXMPProperty.Create(Schema, Self);
FSubProperties.Add(Result);
if HasNamedSubProperties then Result.FName := AName;
Changed;
end;
procedure TXMPProperty.Changed;
begin
if FSchema <> nil then FSchema.Changed;
end;
function TXMPProperty.FindSubProperty(const AName: UnicodeString; out Prop: TXMPProperty): Boolean;
var
I: Integer;