108 lines
2 KiB
C
108 lines
2 KiB
C
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/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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tiffstub.h
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Abstract:
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Miminal set of declarations for dealing with TIFF files. We need this in the
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monitor because a fax print job may consist of several TIFF files concatenated
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together. We must patch it up into a single valid TIFF before passing it to
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the fax service.
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Environment:
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Windows NT fax print monitor
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Revision History:
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02/25/96 -davidx-
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Created it.
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dd-mm-yy -author-
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description
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--*/
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#ifndef _TIFFSTUB_H_
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#define _TIFFSTUB_H_
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//
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// Constants for various TIFF data types
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//
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#define TIFFTYPE_BYTE 1
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#define TIFFTYPE_ASCII 2
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#define TIFFTYPE_SHORT 3
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#define TIFFTYPE_LONG 4
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#define TIFFTYPE_RATIONAL 5
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#define TIFFTYPE_SBYTE 6
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#define TIFFTYPE_UNDEFINED 7
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#define TIFFTYPE_SSHORT 8
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#define TIFFTYPE_SLONG 9
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#define TIFFTYPE_SRATIONAL 10
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#define TIFFTYPE_FLOAT 11
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#define TIFFTYPE_DOUBLE 12
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//
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// Constants for TIFF tags which we're interested in
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//
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#define TIFFTAG_STRIPOFFSETS 273
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#define TIFFTAG_STRIPBYTECOUNTS 279
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//
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// Data structure for representing a single IFD entry
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//
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typedef struct {
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WORD tag; // field tag
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WORD type; // field type
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DWORD count; // number of values
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DWORD value; // value or value offset
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} IFDENTRY;
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typedef IFDENTRY UNALIGNED *PIFDENTRY_UNALIGNED;
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//
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// Data structure for representing an IFD
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//
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typedef struct {
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WORD wEntries;
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IFDENTRY ifdEntries[1];
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} IFD;
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typedef IFD UNALIGNED *PIFD_UNALIGNED;
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//
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// Determine whether we're at the beginning of a TIFF file
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//
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#define ValidTiffFileHeader(p) \
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(((LPSTR) (p))[0] == 'I' && ((LPSTR) (p))[1] == 'I' && \
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((PBYTE) (p))[2] == 42 && ((PBYTE) (p))[3] == 0)
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//
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// Read a DWORD value from an unaligned address
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//
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#define ReadUnalignedDWord(p) *((DWORD UNALIGNED *) (p))
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//
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// Write a DWORD value to an unaligned address
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//
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#define WriteUnalignedDWord(p, value) (*((DWORD UNALIGNED *) (p)) = (value))
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#endif // !_TIFFSTUB_H_
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