201 lines
6.9 KiB
C
201 lines
6.9 KiB
C
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#ifndef _AWG3FILE_
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#define _AWG3FILE_
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/********************************************************************
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@doc EXTERNAL SRVRDLL LINEARIZER
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@type VOID | AWG3 File Format |
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An AWG3 file can be used to describe any
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multi page image encoded using a CCITT G3 standard like
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MH, MR, or MMR.
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The file format is a special case of the Microsoft Fax Linearized
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format. It consists of a LINHEADER structure, followed by
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an extended linearized header, followed by the image data.
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The image data is specified as one or more headers, each followed
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by a page of encoded image data. Each header starts a
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new page. The file is terminated with a header containing
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a special end-of-file signature marker.
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Linearizer helper function CreateSimpleHeader should be used to
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write the LINHEADER and extended linearized header when creating
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an AWG3 file.
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Linearizer helper function DiscardLinHeader should be used to
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skip past the LINHEADER and extended linearized header when
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reading the AWG3 file.
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The page header format is defined by the structure <t AWG3HEADER>.
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The data for each page consists of one or more frames.
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A frame consists of a DWORD indicating the length of data in
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the frame followed by that many bytes of data. The last
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frame of each page must be of zero length and indicates
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the end of the page data.
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The data consists of raw MH, MR, or MMR, encoded so that the
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least significant bit of each byte should be sent first over
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the wire.
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@xref <t AWG3HEADER>
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********************************************************************/
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/********
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@doc EXTERNAL SRVRDLL LINEARIZER
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@types AWG3HEADER | Describes the Header Structure for an AWG3 File.
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@field WORD | wSig | Must be SIG_G3 for the page headers, and
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SIG_ENDFILE for the end of file header.
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@field WORD | wHeaderSize | Must be set to the size of the header
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structure. Used for version control.
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@field WORD | wTotalHeaders | If non-zero, this indicates the total
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number of and headers (including the end-of-file header)
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in this file. This need only be set in the first header.
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If zero, the total number of headers is not specified directly and
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can be obtained by traversing the headers in the file (until
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the end-of-file header).
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@field WORD | wHeaderNum | Gives the ordinal number for this
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header. Must be set for all headers. Numbering starts at 1.
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@field DWORD | lDataOffset | Gives the offset from the beginning
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of the current header to the start of the first frame
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of the data for this page.
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Must always be set.
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@field DWORD | lNextHeaderOffset | Gives the offset from the start of the
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current header to where the header for the next page can be found. If this
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is set to 0, the next header starts at the end of the
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last frame (which will be a null frame) for this page.
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@field DWORD | AwRes | One of the standard resolution defines
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specified in <t STD_RESOLUTIONS>.
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@field DWORD | Encoding | One of the G3 Fax types from the
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standard types defined in <t STD_DATA_TYPES>. Basically one
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of MH_DATA, MR_DATA, or MMR_DATA.
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@field DWORD | PageWidth | One of the standard page widths as defined in
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<t STD_PAGE_WIDTHS>.
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@field DWORD | PageLength | One of the standard page lengths as defined in
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<t STD_PAGE_LENGTHS>.
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@xref <t AWG3 File Format>
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********/
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#define SIG_G3 0x3347
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#define SIG_ENDFILE 0x4067
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#ifndef WIN16 // remove WIN16 irritation
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#pragma pack(push)
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#endif
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#pragma pack(1)
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typedef struct {
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WORD wSig; // always set to one of the above SIG_ #defines
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WORD wHeaderSize; // always set
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WORD wTotalHeaders; // can be 0
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WORD wHeaderNum; // starts from 1
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// 8 bytes
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// all offsets from start of _this_header_
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DWORD lDataOffset; // always set. points to the first frame-size DWORD
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DWORD lNextHeaderOffset; // may be NULL--then next header follows end of data
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// 16 bytes
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DWORD AwRes; // as per AWRES_ defines below. DIFFERENT from Snowball
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DWORD Encoding; // as per _DATA defines below. Same as Snowball
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DWORD PageWidth; // as per WIDTH_ defines below. Same as Snowball
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DWORD PageLength; // as per LENGTH_ defines below. Same as SNowball
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// 32 bytes
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BYTE Reserved1[32]; // pad out to 64 bytes for future expansion
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} AWG3HEADER, far* LPAWG3HEADER;
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#ifdef WIN16 // remove WIN16 irritation
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#pragma pack()
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#else
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#pragma pack(pop)
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#endif
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// Standard Bit Valued MetaData values
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#define MH_DATA 0x00000001L
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#define MR_DATA 0x00000002L
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#define MMR_DATA 0x00000004L
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// Standard Resolutions
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#define AWRES_UNKNOWN 0x00000000L
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#define AWRES_CUSTOM 0x00000001L
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#define AWRES_mm080_038 0x00000002L
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#define AWRES_mm080_077 0x00000004L
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#define AWRES_mm080_154 0x00000008L
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#define AWRES_mm160_154 0x00000010L
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#define AWRES_200_100 0x00000020L
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#define AWRES_200_200 0x00000040L
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#define AWRES_200_400 0x00000080L
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#define AWRES_300_300 0x00000100L
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#define AWRES_400_400 0x00000200L
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#define AWRES_600_600 0x00000400L
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#define AWRES_75_75 0x00000800L
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#define AWRES_100_100 0x00001000L
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/********
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@doc EXTERNAL DATATYPES SRVRDLL
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@type WORD | STD_PAGE_LENGTHS | Standard Page Lengths
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@emem LENGTH_A4 | Std A4 paper length, Value: 0
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@emem LENGTH_B4 | Std B4 paper length, Value: 1
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@emem LENGTH_UNLIMITED | Unknown length, Value: 2
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@comm These lengths are compatible with those defined
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by the CCITT for G3 machines. They are used
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in fax format headers, and in structures dealing
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with fax machine capabilities.
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********/
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// Length defines
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#define LENGTH_A4 0
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#define LENGTH_B4 1
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#define LENGTH_UNLIMITED 2
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/********
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@doc EXTERNAL DATATYPES SRVRDLL
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@type WORD | STD_PAGE_WIDTHS | Standard Page Widths
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@emem WIDTH_A4 |1728 pixels, Value: 0
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@emem WIDTH_B4 |2048 pixels, Value: 1
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@emem WIDTH_A3 |2432 pixels, Value: 2
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@emem WIDTH_A5 |1216 pixels, Value: 16
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@emem WIDTH_A6 |864 pixels, Value: 32
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@comm These widths are compatible with those defined
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by the CCITT for G3 machines. They are used
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in fax format headers, and in structures dealing
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with fax machine capabilities.
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********/
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//Width defines
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#define WIDTH_A4 0 /* 1728 pixels */
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#define WIDTH_B4 1 /* 2048 pixels */
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#define WIDTH_A3 2 /* 2432 pixels */
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#define WIDTH_MAX WIDTH_A3
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#define WIDTH_A5 16 /* 1216 pixels */
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#define WIDTH_A6 32 /* 864 pixels */
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#define WIDTH_A5_1728 64 /* 1216 pixels */
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#define WIDTH_A6_1728 128 /* 864 pixels */
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#endif // _AWG3FILE_
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