rtfactn.c

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/*
 * This code was on the internet for reading in RTF files.
 */
#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <ctype.h>
#include "rtftype.h"
#include "rtfdecl.h"

// RTF parser tables

// Property descriptions
PROP rgprop [ipropMax] = {
    actnByte,   propChp,    offsetof(CHP, fBold),       // ipropBold
    actnByte,   propChp,    offsetof(CHP, fItalic),     // ipropItalic
    actnByte,   propChp,    offsetof(CHP, fUnderline),  // ipropUnderline
    actnWord,   propPap,    offsetof(PAP, xaLeft),      // ipropLeftInd
    actnWord,   propPap,    offsetof(PAP, xaRight),     // ipropRightInd
    actnWord,   propPap,    offsetof(PAP, xaFirst),     // ipropFirstInd
    actnWord,   propSep,    offsetof(SEP, cCols),       // ipropCols
    actnWord,   propSep,    offsetof(SEP, xaPgn),       // ipropPgnX
    actnWord,   propSep,    offsetof(SEP, yaPgn),       // ipropPgnY
    actnWord,   propDop,    offsetof(DOP, xaPage),      // ipropXaPage
    actnWord,   propDop,    offsetof(DOP, yaPage),      // ipropYaPage
    actnWord,   propDop,    offsetof(DOP, xaLeft),      // ipropXaLeft
    actnWord,   propDop,    offsetof(DOP, xaRight),     // ipropXaRight
    actnWord,   propDop,    offsetof(DOP, yaTop),       // ipropYaTop
    actnWord,   propDop,    offsetof(DOP, yaBottom),    // ipropYaBottom
    actnWord,   propDop,    offsetof(DOP, pgnStart),    // ipropPgnStart
    actnByte,   propSep,    offsetof(SEP, sbk),         // ipropSbk
    actnByte,   propSep,    offsetof(SEP, pgnFormat),   // ipropPgnFormat
    actnByte,   propDop,    offsetof(DOP, fFacingp),    // ipropFacingp
    actnByte,   propDop,    offsetof(DOP, fLandscape),  // ipropLandscape
    actnByte,   propPap,    offsetof(PAP, just),        // ipropJust
    actnSpec,   propPap,    0,                          // ipropPard
    actnSpec,   propChp,    0,                          // ipropPlain
    actnSpec,   propSep,    0,                          // ipropSectd
};

// Keyword descriptions
SYM rgsymRtf[] = {
//  keyword     dflt    fPassDflt   kwd         idx
    "b",        1,      fFalse,     kwdProp,    ipropBold,
    "u",        1,      fFalse,     kwdProp,    ipropUnderline,
    "i",        1,      fFalse,     kwdProp,    ipropItalic,
    "li",       0,      fFalse,     kwdProp,    ipropLeftInd,
    "ri",       0,      fFalse,     kwdProp,    ipropRightInd,
    "fi",       0,      fFalse,     kwdProp,    ipropFirstInd,
    "cols",     1,      fFalse,     kwdProp,    ipropCols,
    "sbknone",  sbkNon, fTrue,      kwdProp,    ipropSbk,
    "sbkcol",   sbkCol, fTrue,      kwdProp,    ipropSbk,
    "sbkeven",  sbkEvn, fTrue,      kwdProp,    ipropSbk,
    "sbkodd",   sbkOdd, fTrue,      kwdProp,    ipropSbk,
    "sbkpage",  sbkPg,  fTrue,      kwdProp,    ipropSbk,
    "pgnx",     0,      fFalse,     kwdProp,    ipropPgnX,
    "pgny",     0,      fFalse,     kwdProp,    ipropPgnY,
    "pgndec",   pgDec,  fTrue,      kwdProp,    ipropPgnFormat,
    "pgnucrm",  pgURom, fTrue,      kwdProp,    ipropPgnFormat,
    "pgnlcrm",  pgLRom, fTrue,      kwdProp,    ipropPgnFormat,
    "pgnucltr", pgULtr, fTrue,      kwdProp,    ipropPgnFormat,
    "pgnlcltr", pgLLtr, fTrue,      kwdProp,    ipropPgnFormat,
    "qc",       justC,  fTrue,      kwdProp,    ipropJust,
    "ql",       justL,  fTrue,      kwdProp,    ipropJust,
    "qr",       justR,  fTrue,      kwdProp,    ipropJust,
    "qj",       justF,  fTrue,      kwdProp,    ipropJust,
    "paperw",   12240,  fFalse,     kwdProp,    ipropXaPage,
    "paperh",   15480,  fFalse,     kwdProp,    ipropYaPage,
    "margl",    1800,   fFalse,     kwdProp,    ipropXaLeft,
    "margr",    1800,   fFalse,     kwdProp,    ipropXaRight,
    "margt",    1440,   fFalse,     kwdProp,    ipropYaTop,
    "margb",    1440,   fFalse,     kwdProp,    ipropYaBottom,
    "pgnstart", 1,      fTrue,      kwdProp,    ipropPgnStart,
    "facingp",  1,      fTrue,      kwdProp,    ipropFacingp,
    "landscape",1,      fTrue,      kwdProp,    ipropLandscape,
    "par",      0,      fFalse,     kwdChar,    0x0a,
    "\0x0a",    0,      fFalse,     kwdChar,    0x0a,
    "\0x0d",    0,      fFalse,     kwdChar,    0x0a,
    "tab",      0,      fFalse,     kwdChar,    0x09,
    "ldblquote",0,      fFalse,     kwdChar,    '"',
    "rdblquote",0,      fFalse,     kwdChar,    '"',
    "bin",      0,      fFalse,     kwdSpec,    ipfnBin,
    "*",        0,      fFalse,     kwdSpec,    ipfnSkipDest,
    "'",        0,      fFalse,     kwdSpec,    ipfnHex,
    "author",   0,      fFalse,     kwdDest,    idestSkip,
    "buptim",   0,      fFalse,     kwdDest,    idestSkip,
    "colortbl", 0,      fFalse,     kwdDest,    idestSkip,
    "comment",  0,      fFalse,     kwdDest,    idestSkip,
    "creatim",  0,      fFalse,     kwdDest,    idestSkip,
    "doccomm",  0,      fFalse,     kwdDest,    idestSkip,
    "fonttbl",  0,      fFalse,     kwdDest,    idestSkip,
    "footer",   0,      fFalse,     kwdDest,    idestSkip,
    "footerf",  0,      fFalse,     kwdDest,    idestSkip,
    "footerl",  0,      fFalse,     kwdDest,    idestSkip,
    "footerr",  0,      fFalse,     kwdDest,    idestSkip,
    "footnote", 0,      fFalse,     kwdDest,    idestSkip,
    "ftncn",    0,      fFalse,     kwdDest,    idestSkip,
    "ftnsep",   0,      fFalse,     kwdDest,    idestSkip,
    "ftnsepc",  0,      fFalse,     kwdDest,    idestSkip,
    "header",   0,      fFalse,     kwdDest,    idestSkip,
    "headerf",  0,      fFalse,     kwdDest,    idestSkip,
    "headerl",  0,      fFalse,     kwdDest,    idestSkip,
    "headerr",  0,      fFalse,     kwdDest,    idestSkip,
    "info",     0,      fFalse,     kwdDest,    idestSkip,
    "keywords", 0,      fFalse,     kwdDest,    idestSkip,
    "operator", 0,      fFalse,     kwdDest,    idestSkip,
    "pict",     0,      fFalse,     kwdDest,    idestSkip,
    "printim",  0,      fFalse,     kwdDest,    idestSkip,
    "private1", 0,      fFalse,     kwdDest,    idestSkip,
    "revtim",   0,      fFalse,     kwdDest,    idestSkip,
    "rxe",      0,      fFalse,     kwdDest,    idestSkip,
    "stylesheet",   0,      fFalse,     kwdDest,    idestSkip,
    "subject",  0,      fFalse,     kwdDest,    idestSkip,
    "tc",       0,      fFalse,     kwdDest,    idestSkip,
    "title",    0,      fFalse,     kwdDest,    idestSkip,
    "txe",      0,      fFalse,     kwdDest,    idestSkip,
    "xe",       0,      fFalse,     kwdDest,    idestSkip,
    "{",        0,      fFalse,     kwdChar,    '{',
    "}",        0,      fFalse,     kwdChar,    '}',
    "\\",       0,      fFalse,     kwdChar,    '\\'
    };
int isymMax = sizeof(rgsymRtf) / sizeof(SYM);

//
// %%Function: ecApplyPropChange
//
// Set the property identified by _iprop_ to the value _val_.
//
//

int
ecApplyPropChange(IPROP iprop, int val)
{
    char *pb;

    if (rds == rdsSkip)                 // If we're skipping text,
        return ecOK;                    // don't do anything.

    switch (rgprop[iprop].prop)
    {
    case propDop:
        pb = (char *)&dop;
        break;
    case propSep:
        pb = (char *)&sep;
        break;
    case propPap:
        pb = (char *)&pap;
        break;
    case propChp:
        pb = (char *)&chp;
        break;
    default:
        if (rgprop[iprop].actn != actnSpec)
            return ecBadTable;
        break;
    }
    switch (rgprop[iprop].actn)
    {
    case actnByte:
        pb[rgprop[iprop].offset] = (unsigned char) val;
        break;
    case actnWord:
        (*(int *) (pb+rgprop[iprop].offset)) = val;
        break;
    case actnSpec:
        return ecParseSpecialProperty(iprop, val);
        break;
    default:
        return ecBadTable;
    }
    return ecOK;
}

//
// %%Function: ecParseSpecialProperty
//
// Set a property that requires code to evaluate.
//

int
ecParseSpecialProperty(IPROP iprop, int val)
{
    switch (iprop)
    {
    case ipropPard:
        memset(&pap, 0, sizeof(pap));
        return ecOK;
    case ipropPlain:
        memset(&chp, 0, sizeof(chp));
        return ecOK;
    case ipropSectd:
        memset(&sep, 0, sizeof(sep));
        return ecOK;
    default:
        return ecBadTable;
    }
    return ecBadTable;
}

//
// %%Function: ecTranslateKeyword.
//
// Step 3.
// Search rgsymRtf for szKeyword and evaluate it appropriately.
//
// Inputs:
// szKeyword:   The RTF control to evaluate.
// param:       The parameter of the RTF control.
// fParam:      fTrue if the control had a parameter; (that is, if param is valid)
//              fFalse if it did not.
//

int
ecTranslateKeyword(char *szKeyword, int param, bool fParam)
{
    int isym;

    // search for szKeyword in rgsymRtf

    for (isym = 0; isym < isymMax; isym++)
        if (strcmp(szKeyword, rgsymRtf[isym].szKeyword) == 0)
            break;
    if (isym == isymMax)            // control word not found
    {
        if (fSkipDestIfUnk)         // if this is a new destination
            rds = rdsSkip;          // skip the destination
                                    // else just discard it
        fSkipDestIfUnk = fFalse;
        return ecOK;
    }

    // found it!  use kwd and idx to determine what to do with it.

    fSkipDestIfUnk = fFalse;
    switch (rgsymRtf[isym].kwd)
    {
    case kwdProp:
        if (rgsymRtf[isym].fPassDflt || !fParam)
            param = rgsymRtf[isym].dflt;
        return ecApplyPropChange(rgsymRtf[isym].idx, param);
    case kwdChar:
        return ecParseChar(rgsymRtf[isym].idx);
    case kwdDest:
        return ecChangeDest(rgsymRtf[isym].idx);
    case kwdSpec:
        return ecParseSpecialKeyword(rgsymRtf[isym].idx);
    default:
        return ecBadTable;
    }
    return ecBadTable;
}

//
// %%Function: ecChangeDest
//
// Change to the destination specified by idest.
// There's usually more to do here than this...
//

int
ecChangeDest(IDEST idest)
{
    if (rds == rdsSkip)             // if we're skipping text,
        return ecOK;                // don't do anything

    switch (idest)
    {
    default:
        rds = rdsSkip;              // when in doubt, skip it...
        break;
    }
    return ecOK;
}

//
// %%Function: ecEndGroupAction
//
// The destination specified by rds is coming to a close.
// If there's any cleanup that needs to be done, do it now.
//

int
ecEndGroupAction(RDS rds)
{
    return ecOK;
}

//
// %%Function: ecParseSpecialKeyword
//
// Evaluate an RTF control that needs special processing.
//

int
ecParseSpecialKeyword(IPFN ipfn)
{
    if (rds == rdsSkip && ipfn != ipfnBin)  // if we're skipping, and it's not
        return ecOK;                        // the \bin keyword, ignore it.
    switch (ipfn)
    {
    case ipfnBin:
        ris = risBin;
        cbBin = lParam;
        break;
    case ipfnSkipDest:
        fSkipDestIfUnk = fTrue;
        break;
    case ipfnHex:
        ris = risHex;
        break;
    default:
        return ecBadTable;
    }
    return ecOK;
}