/*++

Copyright (c) 1995  Microsoft Corporation

Module Name:

    ppdfile.c

Abstract:

    PostScript driver PPD parser - FILEOBJ implementation

[Notes:]

Revision History:

    4/19/95 -davidx-
        Created it.

    mm/dd/yy -author-
        description

--*/


#include "pslib.h"
#include "ppdfile.h"

// 16-bit crc checksum table - copied from win95

WORD Crc16Table[] = {
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
    0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
    0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
    0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
    0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
    0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
    0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
    0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
    0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
    0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
    0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
    0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
    0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
    0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
    0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
    0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
    0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
    0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
    0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
    0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
    0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
    0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
    0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
    0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
    0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
    0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
    0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
    0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
    0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
    0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
    0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
    0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};



PFILEOBJ
FILEOBJ_Create(
    PCWSTR  pwstrFilename,
    WORD   *pwChecksum
    )

/*++

Routine Description:

    Create a file object

Arguments:

    pwstrFilename - Pointer to fully qualified Unicode filename
    pwChecksum - Pointer to a 16-bit crc checksum variable

Return Value:

    Pointer to newly created file object
    NULL if an error occured

--*/

{
    PFILEOBJ    pFileObj;

    // Allocate space for a file object

    pFileObj = (PFILEOBJ) MEMALLOC(sizeof(FILEOBJ));

    if (pFileObj != NULL) {

        // Save the pointer to checksum variable

        pFileObj->pwChecksum = pwChecksum;

        // Map the file into memory

        if (! MAPFILE(
                pwstrFilename,
                &pFileObj->hModule,
                (PBYTE*) &pFileObj->pNextChar,
                &pFileObj->cbAvailable))
        {
            DBGERRMSG("MAPFILE");
            MEMFREE(pFileObj);
            pFileObj = NULL;
        }
    } else {

        // Failed to allocate memory

        DBGERRMSG("MEMALLOC");
    }

    return pFileObj;
}



VOID
FILEOBJ_Delete(
    PFILEOBJ    pFileObj
    )

/*++

Routine Description:

    Delete a file object returned by FILEOBJ_Create

Arguments:

    pFileObj - Pointer to the file object to be deleted

Return Value:

    NONE

--*/

{
    ASSERT(pFileObj != NULL);

    // Unload the file from memory

    FREEMODULE(pFileObj->hModule);

    // Free the file buffer

    MEMFREE(pFileObj);
}



PPDERROR
FILEOBJ_GetChar(
    PFILEOBJ    pFileObj,
    PSTR        pCh
    )

/*++

Routine Description:

    Read a single character from a file object.

Arguments:

    pFileObj - Pointer to a file object.
    pCh - Pointer to a char for storing the return character.

Return Value:

    PPDERR_NONE - a character is read successfully
    PPDERR_EOF - reached end-of-file
    PPDERR_FILE - error occured on file operation

--*/

{
    // Check if there is anything left in the file buffer

    if (pFileObj->cbAvailable == 0)
        return PPDERR_EOF;

    // Return the next byte from the file

    pFileObj->cbAvailable--;
    *pCh = *pFileObj->pNextChar++;

    // Compute 16-bit crc checksum

    *pFileObj->pwChecksum =
        Crc16Table[(*pFileObj->pwChecksum >> 8) ^ ((BYTE) *pCh)] ^
        (*pFileObj->pwChecksum << 8);

    return PPDERR_NONE;
}