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CCR.Exif.BaseUtils.pas
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CCR.Exif.BaseUtils.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.BaseUtils.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. }
{ }
{**************************************************************************************}
{$I CCR.Exif.inc}
unit CCR.Exif.BaseUtils;
interface
uses
Types, SysUtils, Classes, {$IFNDEF UNICODE}WideStrings,{$ENDIF}
{$IFDEF NeedHausladenByteStringsFix}System.ByteStrings,{$ENDIF}
{$IFDEF HasGenerics}Generics.Collections{$ELSE}Contnrs{$ENDIF},
CCR.Exif.StreamHelper;
{ Mappings for compatibility with compilers for mobile }
type
{$IFDEF NeedHausladenByteStringsFix} //see http://andy.jgknet.de/blog/2013/10/the-return-of-the-byte-strings/
AnsiChar = System.ByteStrings.AnsiChar;
AnsiString = System.ByteStrings.AnsiString;
PAnsiChar = System.ByteStrings.PAnsiChar;
RawByteString = System.ByteStrings.RawByteString;
UTF8String = System.ByteStrings.UTF8String;
{$ENDIF}
{$IFDEF HasGenerics}
TClassList = TList<TClass>;
TObjectList = TObjectList<TObject>;
{$ELSE}
TClassList = Contnrs.TClassList;
TObjectList = Contnrs.TObjectList;
{$ENDIF}
{$IFDEF NEXTGEN}
{$WARNINGS OFF}
TSysCharSet = set of Char;
{$WARNINGS ON}
{$ENDIF}
{ Mappings for compatibility with older compilers }
type
{$IF not Declared(EProgrammerNotFound)}
EProgrammerNotFound = class(Exception);
{$IFEND}
{$IFDEF UNICODE}
TUnicodeStrings = TStrings;
TUnicodeStringList = TStringList;
{$ELSE}
TUnicodeStrings = TWideStrings;
TUnicodeStringList = TWideStringList;
RawByteString = AnsiString; //added in D2009
UnicodeString = WideString; //added in D2009
{$IF not Declared(TBytes)}
TBytes = array of Byte; //added in D2007
{$IFEND}
function UpCase(const Ch: AnsiChar): AnsiChar; overload;
function UpCase(const Ch: WideChar): WideChar; overload;
function UTF8ToString(const UTF8: RawByteString): string; inline; overload;
{$ENDIF}
function IsCharIn(Ch: AnsiChar; const CharSet: TSysCharSet): Boolean; inline; overload;
function IsCharIn(Ch: WideChar; const CharSet: TSysCharSet): Boolean; inline; overload; //not CharInSet to avoid ambiguous overload errors
function UTF8ToString(UTF8Buffer: Pointer; ByteLen: Integer): string; overload;
function BinToHexStr(Data: Pointer; Size: Integer): string; overload;
function BinToHexStr(const Buffer; Size: Integer): string; overload; inline;
function HexStrToBin(const Text: string): TBytes;
function GetExecutableName: string; inline;
{ non-specific }
type
ECCRExifException = class(Exception);
EUnsupportedGraphicFormat = class(ECCRExifException);
TMetadataLoadError = (leBadOffset, leBadTagCount, leBadTagHeader);
TMetadataLoadErrors = set of TMetadataLoadError;
TNoRefCountInterfacedObject = class(TObject, IInterface)
protected
function QueryInterface(const IID: TGUID; out Obj): HResult; stdcall;
function _AddRef: Integer; stdcall;
function _Release: Integer; stdcall;
end;
IStreamPersistEx = interface(IStreamPersist)
['{2E9F3433-E5A9-4FBA-9C89-68B97DADA33C}']
function GetEmpty: Boolean;
property Empty: Boolean read GetEmpty;
end;
IMetadataBlock = interface
['{F77F5203-C526-4457-81A7-13941FE461CB}']
function GetData: TCustomMemoryStream;
function IsExifBlock(CheckID: Boolean = True): Boolean;
function IsIPTCBlock(CheckID: Boolean = True): Boolean;
function IsXMPBlock(CheckID: Boolean = True): Boolean;
property Data: TCustomMemoryStream read GetData; //this is not guaranteed to be writeable
end;
TMetadataBlockDynArray = array of IMetadataBlock;
TMetadataBlock = class(TInterfacedObject, IMetadataBlock)
protected type
TDataStream = class(TMemoryStream)
strict private
FDisableChanges: Boolean;
protected
function Realloc(var NewCapacity: Longint): Pointer; override;
procedure SetSize(const NewSize: Int64); override;
public
destructor Destroy; override;
procedure SetSize(NewSize: Longint); override;
function Write(const Buffer; Count: Longint): Longint; override;
property DisableChanges: Boolean read FDisableChanges write FDisableChanges;
end;
strict private
FData: TDataStream;
protected
function GetData: TCustomMemoryStream;
function HasExifBlockID: Boolean; virtual;
function HasIPTCBlockID: Boolean; virtual;
function HasXMPBlockID: Boolean; virtual;
public
constructor Create(const DataSource: IStreamPersist = nil); overload;
constructor Create(DataSource: TStream; BytesToRead: Integer); overload;
destructor Destroy; override;
function IsExifBlock(CheckID: Boolean = True): Boolean;
function IsIPTCBlock(CheckID: Boolean = True): Boolean;
function IsXMPBlock(CheckID: Boolean = True): Boolean;
property Data: TDataStream read FData;
end;
TDateTimeTagValue = record
strict private const
FirstValidDateTime: TDateTime = -693593; //1st Jan, 1 AD
MissingOrInvalidValue: TDateTime = -700000;
strict private
FValue: TDateTime;
public
constructor CreateFromString(const AString: string);
class function CreateMissingOrInvalid: TDateTimeTagValue; static;
class operator Equal(const A, B: TDateTimeTagValue): Boolean;
class operator NotEqual(const A, B: TDateTimeTagValue): Boolean;
class operator Implicit(const Source: TDateTimeTagValue): TDateTime;
class operator Implicit(const Source: TDateTime): TDateTimeTagValue;
class operator LessThan(const A, B: TDateTimeTagValue): Boolean;
class operator LessThanOrEqual(const A, B: TDateTimeTagValue): Boolean;
class operator GreaterThan(const A, B: TDateTimeTagValue): Boolean;
class operator GreaterThanOrEqual(const A, B: TDateTimeTagValue): Boolean;
function ToString: string; overload;
function ToString(const Format: string): string; overload;
{$IFDEF HasFormatSettings}
function ToString(const Format: string; const Settings: TFormatSettings): string; overload;
{$ENDIF}
property AsString: string read ToString;
function MissingOrInvalid: Boolean; inline;
property Value: TDateTime read FValue;
end;
TLongIntTagValue = record
strict private
FValue: LongInt;
FMissingOrInvalid: Boolean;
public
constructor CreateFromString(const AString: string);
class function CreateMissingOrInvalid: TLongIntTagValue; static;
class operator Equal(const A, B: TLongIntTagValue): Boolean;
class operator NotEqual(const A, B: TLongIntTagValue): Boolean;
class operator Implicit(const Source: TLongIntTagValue): Int64;
class operator Implicit(const Source: TLongIntTagValue): LongInt;
class operator Implicit(const Source: LongInt): TLongIntTagValue;
class operator LessThan(const A, B: TLongIntTagValue): Boolean;
class operator LessThanOrEqual(const A, B: TLongIntTagValue): Boolean;
class operator GreaterThan(const A, B: TLongIntTagValue): Boolean;
class operator GreaterThanOrEqual(const A, B: TLongIntTagValue): Boolean;
class operator Negative(const Source: TLongIntTagValue): TLongIntTagValue;
function ToString: string;
property AsString: string read ToString;
property MissingOrInvalid: Boolean read FMissingOrInvalid;
property Value: LongInt read FValue;
end;
TLongWordTagValue = record
strict private
FValue: LongWord;
FMissingOrInvalid: Boolean;
public
constructor CreateFromString(const AString: string);
class function CreateMissingOrInvalid: TLongWordTagValue; static;
class operator Equal(const A, B: TLongWordTagValue): Boolean;
class operator NotEqual(const A, B: TLongWordTagValue): Boolean;
class operator Implicit(const Source: TLongWordTagValue): Int64;
class operator Implicit(const Source: TLongWordTagValue): UInt64;
class operator Implicit(const Source: TLongWordTagValue): LongWord;
class operator Implicit(const Source: LongWord): TLongWordTagValue;
class operator LessThan(const A, B: TLongWordTagValue): Boolean;
class operator LessThanOrEqual(const A, B: TLongWordTagValue): Boolean;
class operator GreaterThan(const A, B: TLongWordTagValue): Boolean;
class operator GreaterThanOrEqual(const A, B: TLongWordTagValue): Boolean;
function ToString: string;
property AsString: string read ToString;
property MissingOrInvalid: Boolean read FMissingOrInvalid;
property Value: LongWord read FValue;
end;
TWordTagValue = record
strict private
FValue: Word;
FMissingOrInvalid: Boolean;
public
constructor CreateFromString(const AString: string);
class function CreateMissingOrInvalid: TWordTagValue; static;
class operator Equal(const A, B: TWordTagValue): Boolean;
class operator NotEqual(const A, B: TWordTagValue): Boolean;
class operator Implicit(const Source: TWordTagValue): Int64;
class operator Implicit(const Source: TWordTagValue): UInt64;
class operator Implicit(const Source: TWordTagValue): Integer;
class operator Implicit(const Source: TWordTagValue): Word;
class operator Implicit(const Source: TWordTagValue): TLongIntTagValue;
class operator Implicit(const Source: TWordTagValue): TLongWordTagValue;
class operator Implicit(const Source: Word): TWordTagValue;
class operator LessThan(const A, B: TWordTagValue): Boolean;
class operator LessThanOrEqual(const A, B: TWordTagValue): Boolean;
class operator GreaterThan(const A, B: TWordTagValue): Boolean;
class operator GreaterThanOrEqual(const A, B: TWordTagValue): Boolean;
function ToString: string;
property AsString: string read ToString;
property MissingOrInvalid: Boolean read FMissingOrInvalid;
property Value: Word read FValue;
end;
TSmallPointHelper = record helper for TSmallPoint
class function CreateMissingOrInvalid: TSmallPoint; static;
function MissingOrInvalid: Boolean; inline;
end;
TUserMemoryStream = class(TCustomMemoryStream) //read-only stream access on an existing buffer;
protected
procedure SetSize(NewSize: Longint); override;
procedure SetSize(const NewSize: Int64); override;
public
constructor Create(Memory: Pointer; Size: Integer);
procedure ChangeMemory(NewMemory: Pointer; NewSize: Integer);
function Write(const Buffer; Count: Integer): Integer; override;
end;
TGraphicSaveMethod = procedure (InStream, OutStream: TStream) of object;
TGetGraphicSaveMethod = procedure (InStream: TStream; var AMethod: TGraphicSaveMethod) of object;
procedure DoSaveToGraphic(GraphicStream: TStream;
const DetectTypeFunc: TGetGraphicSaveMethod); overload;
procedure DoSaveToGraphic(const FileName: string;
const DetectTypeFunc: TGetGraphicSaveMethod); overload;
procedure DoSaveToGraphic(const Graphic: IStreamPersist; //!!!changed from TGraphic
const DetectTypeFunc: TGetGraphicSaveMethod); overload;
{ PSD file parsing and writing; note that Adobe resource blocks may be found in other types of file too }
type
EInvalidPSDHeader = class(ECCRExifException);
TIPTCSectionID = 1..9;
TIPTCTagID = type Byte;
TIPTCTagInfo = record
SectionID: TIPTCSectionID;
TagID: TIPTCTagID;
DataSize: Integer;
end;
TAdobeResBlock = record public const
ExifTypeID = $0422;
IPTCTypeID = $0404;
XMPTypeID = $0424;
NewIPTCTagMarker: Byte = 28;
class function TryReadIPTCHeader(Stream: TStream; var TagInfo: TIPTCTagInfo;
AlwaysResetStreamPos: Boolean = False): Boolean; static;
end;
IAdobeResBlock = interface(IMetadataBlock)//also IStreamPersist...
['{D7F88330-C1DF-4261-A3B2-1701AFAB8873}']
function GetSignature: AnsiString;
procedure SetSignature(const Value: AnsiString);
function GetTypeID: Word;
procedure SetTypeID(Value: Word);
function GetName: AnsiString;
procedure SetName(const Value: AnsiString);
function GetTotalSize: Integer;
function GetLoadedCleanly: Boolean;
procedure LoadFromStream(Stream: TStream);
procedure SaveToStream(Stream: TStream);
property LoadedCleanly: Boolean read GetLoadedCleanly;
property Signature: AnsiString read GetSignature write SetSignature;
property TypeID: Word read GetTypeID write SetTypeID;
property Name: AnsiString read GetName write SetName;
property TotalSize: Integer read GetTotalSize;
end;
IAdobeResBlockEnumerator = interface
function GetCurrent: IAdobeResBlock;
function MoveNext: Boolean;
property Current: IAdobeResBlock read GetCurrent;
end;
{$Z2}
TAdobeColorMode = (cmMonochrome, cmGrayscale, cmIndexed, cmRGB, cmCMYK,
cmMultichannel, cmHalftone, cmLAB);
{$Z1}
TPSDHeaderInfo = record
Width, Height: Integer;
Channels, Depth: Word;
ColorMode: TAdobeColorMode;
PaletteData: TBytes;
end;
TPSDInfo = record
Header: TPSDHeaderInfo;
ResourceSectionSize, LayersSectionSize: Integer; //includes size of section length field
function ResourceSectionOffset: Integer;
function LayersSectionOffset: Integer;
end;
IAdobeResBlockParser = interface
function GetEnumerator: IAdobeResBlockEnumerator;
end;
function CreateAdobeBlock: IAdobeResBlock; overload;
function CreateAdobeBlock(ATypeID: Word; const ADataSource: IStreamPersist = nil): IAdobeResBlock; overload;
function CreateAdobeBlock(ATypeID: Word; ADataSource: TStream; ADataSize: Integer = 0): IAdobeResBlock; overload;
function CreateAdobeBlock(ATypeID: Word; const AName: AnsiString;
const ADataSource: IStreamPersist = nil): IAdobeResBlock; overload;
function CreateAdobeBlock(const ASignature: AnsiString; ATypeID: Word;
const AName: AnsiString; const ADataSource: IStreamPersist = nil): IAdobeResBlock; overload;
function HasPSDHeader(Stream: TStream): Boolean; overload;
function HasPSDHeader(const FileName: string): Boolean; overload;
function ParsePSDHeader(Stream: TStream; var Info: TPSDInfo;
StreamOwnership: TStreamOwnership = soReference): IAdobeResBlockParser; overload;
function ParsePSDHeader(const FileName: string; var Info: TPSDInfo): IAdobeResBlockParser; overload; inline;
procedure WritePSDHeader(Stream: TStream; const Info: TPSDHeaderInfo);
procedure WritePSDResourceSection(Stream: TStream; const Blocks: array of IAdobeResBlock); overload;
procedure WritePSDResourceSection(Stream: TStream; const Blocks: IInterfaceList); overload;
{ JPEG file parsing and writing }
type
EInvalidJPEGHeader = class(ECCRExifException);
PJPEGSegmentHeader = ^TJPEGSegmentHeader;
TJPEGSegmentHeader = packed record
strict private
function GetDataSize: Word;
procedure SetDataSize(const Value: Word);
public
property DataSize: Word read GetDataSize write SetDataSize;
public
NewMarkerByte: Byte; //$FF
MarkerNum: Byte;
case Integer of
0: (DataSizeHi, DataSizeLo: Byte;
Data: record end);
1: (DataSizeBigEndian: Word);
end;
TJFIFDensityUnits = (duNone, duPixelsPerInch, duPixelsPerCentimetre);
TJFIFData = packed record
strict private
function GetHorzDensity: Word;
procedure SetHorzDensity(const Value: Word);
function GetVertDensity: Word;
procedure SetVertDensity(const Value: Word);
public
property HorzDensity: Word read GetHorzDensity write SetHorzDensity;
property VertDensity: Word read GetVertDensity write SetVertDensity;
public
Ident: array[0..4] of AnsiChar; //should be 'JFIF', including null terminator
MajorVersion, MinorVersion: Byte;
DensityUnits: TJFIFDensityUnits;
case Integer of
0: (HorzDensityHi, HorzDensityLo: Byte;
VertDensityHi, VertDensityLo: Byte;
ThumbnailWidth, ThumbnailHeight: Byte;
ThumbnailPixels: record end);
1: (HorzDensityBigEndian: Word;
VertDensityBigEndian: Word);
end;
PJPEGStartOfFrameData = ^TJPEGStartOfFrameData;
TJPEGStartOfFrameData = packed record
strict private
function GetImageWidth: Word;
function GetImageHeight: Word;
procedure SetImageHeight(const Value: Word);
procedure SetImageWidth(const Value: Word);
public
property ImageWidth: Word read GetImageWidth write SetImageWidth;
property ImageHeight: Word read GetImageHeight write SetImageHeight;
public
SamplePrecision: Byte; //8
ImageHeightHi, ImageHeightLo: Byte;
ImageWidthHi, ImageWidthLo: Byte;
ComponentCount: Byte; //1 = gray scaled, 3 = color YCbCr or YIQ, 4 = color CMYK
ComponentData: record end;
end;
TJPEGMarker = Byte;
TJPEGMarkers = set of TJPEGMarker;
IJPEGSegment = interface(IMetadataBlock) //also IStreamPersistEx...
['{5F41F0BA-C43F-4671-8B66-4B6D5B2BF90F}']
function GetEnumerator: IAdobeResBlockEnumerator;
function GetMarkerNum: TJPEGMarker;
function IsAdobeApp13: Boolean;
property MarkerNum: TJPEGMarker read GetMarkerNum;
end;
TUserJPEGSegment = class(TMetadataBlock, IMetadataBlock, IJPEGSegment,
IStreamPersist, IStreamPersistEx)
strict private
FAdobeHeaderSize: Integer;
FMarkerNum: TJPEGMarker;
protected
function HasExifBlockID: Boolean; override;
function HasIPTCBlockID: Boolean; override;
function HasXMPBlockID: Boolean; override;
{ IStreamPersist }
procedure LoadFromStream(Stream: TStream);
procedure SaveToStream(Stream: TStream);
{ IStreamPersistEx}
function GetEmpty: Boolean;
{ IJPEGSegment }
function GetMarkerNum: TJPEGMarker;
function IsAdobeApp13: Boolean;
public const
AdobeHeader: array[0..13] of AnsiChar = 'Photoshop 3.0'#0;
OldAdobeHeader: array[0..18] of AnsiChar = 'Adobe_Photoshop2.5:';
public
constructor Create(AMarkerNum: TJPEGMarker = 0; const ASource: IStreamPersist = nil); overload;
function GetEnumerator: IAdobeResBlockEnumerator;
function IsIPTCBlock(CheckID: Boolean = True): Boolean; //override inherited implementation
property MarkerNum: TJPEGMarker read FMarkerNum write FMarkerNum;
end;
IFoundJPEGSegment = interface(IJPEGSegment)
['{C236AF21-5577-439A-BD44-8C0673347F44}']
function GetOffset: Int64;
function GetOffsetOfData: Int64;
function GetTotalSize: Integer;
property Offset: Int64 read GetOffset;
property OffsetOfData: Int64 read GetOffsetOfData;
property TotalSize: Integer read GetTotalSize;
end;
IJPEGHeaderParser = interface
function GetCurrent: IFoundJPEGSegment;
function GetEnumerator: IJPEGHeaderParser;
function MoveNext: Boolean;
property Current: IFoundJPEGSegment read GetCurrent;
end;
const
jmNewOrPadding = TJPEGMarker($FF);
jmStartOfImage = TJPEGMarker($D8);
jmEndOfImage = TJPEGMarker($D9);
jmQuantizationTable = TJPEGMarker($DB);
jmStartOfFrame0 = TJPEGMarker($C0);
jmStartOfFrame1 = TJPEGMarker($C1);
jmStartOfFrame2 = TJPEGMarker($C2);
jmStartOfFrame3 = TJPEGMarker($C3);
jmStartOfFrame5 = TJPEGMarker($C5);
jmStartOfFrame6 = TJPEGMarker($C6);
jmStartOfFrame7 = TJPEGMarker($C7);
jmJPEGExtension = TJPEGMarker($C8);
jmHuffmanTable = TJPEGMarker($C4);
jmRestartInternal = TJPEGMarker($DD);
jmComment = TJPEGMarker($FE);
jmAppSpecificFirst = TJPEGMarker($E0);
jmAppSpecificLast = TJPEGMarker($EF);
jmJFIF = TJPEGMarker($E0);
jmApp1 = TJPEGMarker($E1);
jmApp13 = TJPEGMarker($ED);
jmStartOfScan = TJPEGMarker($DA);
JPEGFileHeader: Word = jmNewOrPadding or jmStartOfImage shl 8;
type
TJPEGSegment = record const
HeaderSize = 4;
AllMarkers = [Low(TJPEGMarker)..High(TJPEGMarker)];
AnyMarker = AllMarkers;
MarkersWithNoData = [$00, $01, $D0..$D9];
StartOfFrameMarkers = [jmStartOfFrame0..jmStartOfFrame3,
jmStartOfFrame5..jmStartOfFrame7]; //there's no jmStartOfFrame4
ExifHeader: array[0..5] of AnsiChar = 'Exif'#0#0;
XMPHeader: array[0..28] of AnsiChar = 'http://ns.adobe.com/xap/1.0/'#0;
end;
const
AnyJPEGMarker = TJPEGSegment.AnyMarker;
{
var
Segment: IFoundJPEGSegment;
begin
for Segment in JPEGHeader(JPEGStream) do
...
for Segment in JPEGHeader('myimage.jpg') do
...
for Segment in JPEGHeader(JPEGImage) do
...
}
function JPEGHeader(JPEGStream: TStream; const MarkersToLookFor: TJPEGMarkers = TJPEGSegment.AnyMarker;
StreamOwnership: TStreamOwnership = soReference): IJPEGHeaderParser; overload;
function JPEGHeader(const JPEGFile: string;
const MarkersToLookFor: TJPEGMarkers = TJPEGSegment.AnyMarker): IJPEGHeaderParser; overload; inline;
function JPEGHeader(const JPEGImage: IStreamPersist; //!!!changed from TGraphic
const MarkersToLookFor: TJPEGMarkers = TJPEGSegment.AnyMarker): IJPEGHeaderParser; overload;
function HasJPEGHeader(Stream: TStream): Boolean; overload;
function HasJPEGHeader(const FileName: string): Boolean; overload;
function GetJPEGDataSize(Data: TStream; ReturnZeroIfFindNoEOI: Boolean = False): Int64; overload;
function GetJPEGDataSize(const JPEGImage: IStreamPersist): Int64; overload;
function RemoveJPEGSegments(const JPEGFile: string; Markers: TJPEGMarkers): TJPEGMarkers; overload;
function RemoveJPEGSegments(const JPEGImage: IStreamPersist; Markers: TJPEGMarkers): TJPEGMarkers; overload;
function CreateAdobeApp13Segment(const Blocks: array of IAdobeResBlock): IJPEGSegment; overload;
function CreateAdobeApp13Segment(const Blocks: IInterfaceList = nil): IJPEGSegment; overload;
procedure UpdateApp1JPEGSegments(InStream, OutStream: TStream;
NewExifSource, NewXMPSource: IStreamPersistEx); //used by the SaveToStream methods of TExifData and TXMPPacket; if NewXXXSource is nil, the data in InStream is copied over
procedure WriteJPEGFileHeader(Stream: TStream); inline;
procedure WriteJPEGSegment(Stream: TStream; MarkerNum: TJPEGMarker;
const Data; DataSize: Word); overload;
procedure WriteJPEGSegment(Stream: TStream; MarkerNum: TJPEGMarker;
Data: TStream; DataSize: Word = 0); overload;
procedure WriteJPEGSegment(Stream: TStream; Segment: IJPEGSegment); overload;
{ TIFF bits - the rest is in CCR.Exif.TiffUtils.pas }
const
TiffSmallEndianCode = Word($4949);
TiffBigEndianCode = Word($4D4D);
TiffMagicNum = Word($002A);
TiffMagicNumBigEndian = Word($2A00);
implementation
uses
{$IFDEF MSWINDOWS}Windows,{$ENDIF}{$IFDEF POSIX}Posix.Unistd,{$ENDIF}
{$IFDEF HasIOUtils}IOUtils,{$ENDIF}Math, RTLConsts,
CCR.Exif.Consts, CCR.Exif.TagIDs;
type
TAdobeBlock = class(TMetadataBlock, IStreamPersist, IAdobeResBlock)
strict private
FLoadedCleanly: Boolean;
FSignature: AnsiString;
FTypeID: Word;
FName: AnsiString;
class function GetValidSignature(const S: AnsiString): AnsiString; static;
protected
procedure Clear;
function HasExifBlockID: Boolean; override;
function HasIPTCBlockID: Boolean; override;
function HasXMPBlockID: Boolean; override;
{ IStreamPersist}
procedure LoadFromStream(Stream: TStream);
procedure SaveToStream(Stream: TStream);
{ IAdobeResBlock}
function GetSignature: AnsiString;
procedure SetSignature(const Value: AnsiString);
function GetTypeID: Word;
procedure SetTypeID(Value: Word);
function GetName: AnsiString;
procedure SetName(const Value: AnsiString);
function GetTotalSize: Integer;
function GetLoadedCleanly: Boolean;
function HasIPTCData: Boolean;
public
constructor Create; overload;
constructor Create(AStream: TStream); overload;
constructor Create(const ASignature: AnsiString; ATypeID: Word;
const AName: AnsiString; const ADataSource: IStreamPersist); overload;
end;
TAdobeResBlockEnumerator = class(TInterfacedObject, IAdobeResBlockEnumerator)
strict private
FCurrent: IAdobeResBlock;
FNextPos, FPosTooFar: Int64;
FStream: TStream;
FStreamOwnership: TStreamOwnership;
protected
function GetCurrent: IAdobeResBlock;
property NextPos: Int64 read FNextPos write FNextPos;
property PosTooFar: Int64 read FPosTooFar write FPosTooFar;
public
constructor Create(AStream: TStream; AStreamOwnership: TStreamOwnership = soReference);
destructor Destroy; override;
function MoveNext: Boolean;
property Current: IAdobeResBlock read FCurrent;
property Stream: TStream read FStream;
end;
TFoundJPEGSegment = class(TUserJPEGSegment, IFoundJPEGSegment)
strict private
FOffset: Int64;
protected
{ IFoundJPEGSegment }
function GetOffset: Int64;
function GetOffsetOfData: Int64;
function GetTotalSize: Integer;
public
constructor Create(AMakerNum: TJPEGMarker; ASource: TStream; ADataSize: Integer); overload;
end;
TJPEGHeaderParser = class(TInterfacedObject, IJPEGHeaderParser)
strict private
FCurrent: IFoundJPEGSegment;
FLastMarker: TJPEGMarker;
FMarkersToLookFor: TJPEGMarkers;
FSavedPos, FStartPos: Int64;
FStream: TStream;
FStreamOwnership: TStreamOwnership;
protected
function GetEnumerator: IJPEGHeaderParser;
function GetCurrent: IFoundJPEGSegment;
function MoveNext: Boolean;
public
constructor Create(JPEGStream: TStream; const MarkersToLookFor: TJPEGMarkers;
StreamOwnership: TStreamOwnership);
destructor Destroy; override;
end;
function IsCharIn(Ch: AnsiChar; const CharSet: TSysCharSet): Boolean;
begin
Result := Ch in CharSet;
end;
function IsCharIn(Ch: WideChar; const CharSet: TSysCharSet): Boolean;
begin
Result := (Ch <= High(AnsiChar)) and (AnsiChar(Ch) in CharSet);
end;
{$IFNDEF UNICODE}
function UpCase(const Ch: AnsiChar): AnsiChar;
begin
Result := Ch;
case Result of
'a'..'z': Dec(Result, Ord('a') - Ord('A'));
end;
end;
function UpCase(const Ch: WideChar): WideChar;
begin
Result := Ch;
case Result of
'a'..'z': Dec(Result, Ord('a') - Ord('A'));
end;
end;
function UTF8ToString(const UTF8: RawByteString): string;
begin
Result := Utf8ToAnsi(UTF8);
end;
{$ENDIF}
function UTF8ToString(UTF8Buffer: Pointer; ByteLen: Integer): string;
var
S: UTF8String;
begin
SetString(S, PAnsiChar(UTF8Buffer), ByteLen);
Result := UTF8ToString(S);
end;
function BinToHexStr(Data: Pointer; Size: Integer): string;
const
Map: array[0..15] of Char = (#$30, #$31, #$32, #$33, #$34, #$35,
#$36, #$37, #$38, #$39, #$41, #$42, #$43, #$44, #$45, #$46);
var
Buffer: PByteArray absolute Data;
I: Integer;
begin
SetString(Result, nil, 0);
if Size = 0 then Exit;
SetString(Result, nil, Size * 2);
for I := 0 to Size - 1 do
begin
Result[I * 2 + 1] := Map[Buffer[I] shr 4];
Result[I * 2 + 2] := Map[Buffer[I] and $0F];
end;
end;
function BinToHexStr(const Buffer; Size: Integer): string;
begin
Result := BinToHexStr(@Buffer, Size);
end;
function IsValidHexChar(Ch: Char): Boolean;
begin
case Ch of
'0'..'9','A'..'F','a'..'f': Result := True;
else Result := False;
end;
end;
function HexStrToBin(const Text: string): TBytes;
const
Map: array['0'..'f'] of SmallInt =
( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,
-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,10,11,12,13,14,15);
var
Ch1, Ch2: Char;
I: Integer;
begin
SetLength(Result, Length(Text) div 2);
for I := 0 to High(Result) do
begin
Ch1 := Text[I * 2 + 1];
Ch2 := Text[I * 2 + 2];
if not IsValidHexChar(Ch1) or not IsValidHexChar(Ch2) then
raise EInvalidOperation.CreateFmt(SInvalidHexString, [Text]);
Result[I] := (Map[Ch1] shl 4) + Map[Ch2];
end;
end;
{$IF Declared(TPath)}
function GetTempFileName: string; inline;
begin
Result := TPath.GetTempFileName;
end;
{$ELSE}
function GetTempFileName: string;
var
Buffer: array[0..MAX_PATH] of Char;
begin
if (Windows.GetTempPath(MAX_PATH, Buffer) = 0) or (Windows.GetTempFileName(Buffer,
'tmp', 0, Buffer) = 0) then
RaiseLastOSError
else
Result := Buffer;
end;
{$IFEND}
procedure DoSaveToGraphic(GraphicStream: TStream;
const DetectTypeFunc: TGetGraphicSaveMethod); overload;
var
SaveMethod: TGraphicSaveMethod;
TempFileName: string;
TempStream: TStream;
begin
GraphicStream.Seek(0, soBeginning);
TempFileName := '';
TempStream := nil;
try
SaveMethod := nil;
DetectTypeFunc(GraphicStream, SaveMethod);
if not Assigned(SaveMethod) then
raise EUnsupportedGraphicFormat.CreateRes(@SUnsupportedGraphicFormat);
if GraphicStream.Size < $FFFFFF then //If the source data is under 16MB, buffer to
TempStream := TMemoryStream.Create //memory, else buffer to a temporary file.
else
begin
TempFileName := GetTempFileName;
TempStream := TFileStream.Create(TempFileName, fmCreate);
end;
SaveMethod(GraphicStream, TempStream);
GraphicStream.Seek(0, soBeginning);
if TempStream is TMemoryStream then
GraphicStream.WriteBuffer(TMemoryStream(TempStream).Memory^, TempStream.Size)
else
GraphicStream.CopyFrom(TempStream, 0);
GraphicStream.Size := TempStream.Size;
finally
TempStream.Free;
if TempFileName <> '' then SysUtils.DeleteFile(TempFileName);
end;
end;
procedure DoSaveToGraphic(const FileName: string;
const DetectTypeFunc: TGetGraphicSaveMethod);
var
Stream: TFileStream;
begin
Stream := TFileStream.Create(FileName, fmOpenReadWrite);
try
DoSaveToGraphic(Stream, DetectTypeFunc);
finally
Stream.Free;
end;
end;
procedure DoSaveToGraphic(const Graphic: IStreamPersist;
const DetectTypeFunc: TGetGraphicSaveMethod);
var
Stream: TMemoryStream;
begin
Stream := TMemoryStream.Create;
try
Graphic.SaveToStream(Stream);
DoSaveToGraphic(Stream, DetectTypeFunc);
Stream.Seek(0, soBeginning);
Graphic.LoadFromStream(Stream);
finally
Stream.Free;
end;
end;
{ TNoRefCountInterfacedObject }
function TNoRefCountInterfacedObject.QueryInterface(const IID: TGUID; out Obj): HResult; stdcall;
begin
if GetInterface(IID, Obj) then
Result := 0
else
Result := E_NOINTERFACE;
end;
function TNoRefCountInterfacedObject._AddRef: Integer; stdcall;
begin
Result := -1;
end;
function TNoRefCountInterfacedObject._Release: Integer; stdcall;
begin
Result := -1;
end;
{ TMetadataBlock.TDataStream }
destructor TMetadataBlock.TDataStream.Destroy;
begin
FDisableChanges := False;
inherited;
end;
procedure TMetadataBlock.TDataStream.SetSize(NewSize: Longint);
begin
if DisableChanges then
raise EStreamError.CreateRes(@SStreamIsReadOnly);
inherited SetSize(NewSize);
end;
function TMetadataBlock.TDataStream.Realloc(var NewCapacity: Longint): Pointer;
begin
if DisableChanges then
raise EStreamError.CreateRes(@SStreamIsReadOnly)
else
Result := inherited Realloc(NewCapacity);
end;
procedure TMetadataBlock.TDataStream.SetSize(const NewSize: Int64);
begin
if DisableChanges then
raise EStreamError.CreateRes(@SStreamIsReadOnly);
inherited SetSize(NewSize);
end;
function TMetadataBlock.TDataStream.Write(const Buffer; Count: Longint): Longint;
begin
if DisableChanges then
raise EStreamError.CreateRes(@SStreamIsReadOnly);
Result := inherited Write(Buffer, Count);
end;
{ TMetadataBlock }
constructor TMetadataBlock.Create(const DataSource: IStreamPersist = nil);
begin
inherited Create;
FData := TDataStream.Create;
if DataSource <> nil then DataSource.SaveToStream(FData);
end;
constructor TMetadataBlock.Create(DataSource: TStream; BytesToRead: Integer);
begin
Create;
if BytesToRead > 0 then FData.CopyFrom(DataSource, BytesToRead);
end;
destructor TMetadataBlock.Destroy;
begin
FData.Free;
inherited;
end;
function TMetadataBlock.GetData: TCustomMemoryStream;
begin
Result := FData;
end;
function TMetadataBlock.HasExifBlockID: Boolean;
begin
Result := False;
end;
function TMetadataBlock.HasIPTCBlockID: Boolean;
begin
Result := False;
end;
function TMetadataBlock.HasXMPBlockID: Boolean;
begin
Result := False;
end;
function TMetadataBlock.IsExifBlock(CheckID: Boolean = True): Boolean;
var
Words: PWordArray;
begin
Result := False;
if (CheckID and not HasExifBlockID) or (FData.Size < 8) then Exit;
Words := FData.Memory;
if CompareMem(Words, @TJPEGSegment.ExifHeader, SizeOf(TJPEGSegment.ExifHeader)) then //TExifData will just skip any Exif segment header
Inc(PByte(Words), SizeOf(TJPEGSegment.ExifHeader));
if (Words[0] = TiffSmallEndianCode) or (Words[0] = TiffBigEndianCode) then
case Words[1] of
TiffMagicNum, TiffMagicNumBigEndian: Result := True; //ParseTiff doesn't mind if these are confused
end;
end;
function TMetadataBlock.IsIPTCBlock(CheckID: Boolean = True): Boolean;
var
Header: TIPTCTagInfo;
begin
FData.Seek(0, soFromBeginning);
Result := (not CheckID or HasIPTCBlockID) and
TAdobeResBlock.TryReadIPTCHeader(FData, Header, True);
end;
function TMetadataBlock.IsXMPBlock(CheckID: Boolean = True): Boolean;
const
XMPStart: PAnsiChar = '<?xpacket ';
XMPStartLen = 10;
var
SeekPtr: PAnsiChar;
begin
Result := False;
if (CheckID and not HasXMPBlockID) or (FData.Size < 20) then Exit;
SeekPtr := FData.Memory;
if CompareMem(SeekPtr, @TJPEGSegment.XMPHeader, SizeOf(TJPEGSegment.XMPHeader)) then
Inc(SeekPtr, SizeOf(TJPEGSegment.XMPHeader));
Result := CompareMem(SeekPtr, XMPStart, XMPStartLen);
end;
{ TDateTimeTagValue }
constructor TDateTimeTagValue.CreateFromString(const AString: string);
begin
if not TryStrToDateTime(AString, FValue) then
FValue := MissingOrInvalidValue;
end;
class function TDateTimeTagValue.CreateMissingOrInvalid: TDateTimeTagValue;
begin
Result.FValue := MissingOrInvalidValue;
end;
function TDateTimeTagValue.MissingOrInvalid: Boolean;
begin
Result := (Value < FirstValidDateTime);
end;
function TDateTimeTagValue.ToString: string;
begin
if MissingOrInvalid then
Result := ''
else
Result := DateTimeToStr(Value);
end;
function TDateTimeTagValue.ToString(const Format: string): string;
begin
if MissingOrInvalid then
Result := ''