/* ppmtoarbtxt.c - convert PPM to a custom text-based format

**

** Renamed from ppmtotxt.c by Bryan Henderson in January 2003.

**

** Copyright (C) 1995 by Peter Kirchgessner

**

** Permission to use, copy, modify, and distribute this software and its

** documentation for any purpose and without fee is hereby granted, provided

** that the above copyright notice appear in all copies and that both that

** copyright notice and this permission notice appear in supporting

** documentation.  This software is provided "as is" without express or

** implied warranty.

*/

#include <assert.h>

#include <string.h>

#ifdef __GLIBC__

  #include <printf.h>  /* Necessary for parse_printf_format() */

#endif

#include "pm_c_util.h"

#include "mallocvar.h"

#include "nstring.h"

#include "shhopt.h"

#include "ppm.h"

/* HAVE_PARSE_PRINTF_FORMAT means the system library has

   parse_printf_format(), declared in <printf.h>.  This essentially means

   systems with GNU libc.

*/

#ifndef HAVE_PARSE_PRINTF_FORMAT

  #ifdef PA_FLAG_MASK                   /* Defined in printf.h */

    #define HAVE_PARSE_PRINTF_FORMAT 1

  #else

    #define HAVE_PARSE_PRINTF_FORMAT 0

  #endif

#endif

struct CmdlineInfo {

    /* All the information the user supplied in the command line,

       in a form easy for the program to use.

    */

    const char * inputFileName;

    const char * bodySklFileName;

    const char * hd;

    const char * tl;

    unsigned int debug;

};

static void

parseCommandLine(int argc, const char ** argv,

                 struct CmdlineInfo * const cmdlineP) {

/*----------------------------------------------------------------------------

   Note that many of the strings that this function returns in the

   *cmdline_p structure are actually in the supplied argv array.  And

   sometimes, one of these strings is actually just a suffix of an entry

   in argv!

-----------------------------------------------------------------------------*/

    optEntry * option_def;

        /* Instructions to OptParseOptions3 on how to parse our options.

         */

    optStruct3 opt;

    unsigned int hdSpec, tlSpec;

    unsigned int option_def_index;

    MALLOCARRAY(option_def, 100);

    option_def_index = 0;   /* incremented by OPTENTRY */

    OPTENT3(0,   "hd",   OPT_STRING, &cmdlineP->hd, 

            &hdSpec,             0);

    OPTENT3(0,   "tl",   OPT_STRING, &cmdlineP->tl,

            &tlSpec,             0);

    OPTENT3(0,   "debug", OPT_FLAG, NULL,

            &cmdlineP->debug,      0);

    opt.opt_table = option_def;

    opt.short_allowed = FALSE;  /* We have no short (old-fashioned) options */

    opt.allowNegNum = FALSE;  /* We have no parms that are negative numbers */

    pm_optParseOptions3(&argc, (char **)argv, opt, sizeof(opt), 0);

    free(option_def);

    if (!hdSpec)

        cmdlineP->hd = NULL;

    if (!tlSpec)

        cmdlineP->tl = NULL;

    if (argc-1 < 1)

        pm_error("You must specify the body skeleton file name as an "

                 "argument");

    else {

        cmdlineP->bodySklFileName = strdup(argv[1]);

        if (argc-1 < 2)

            cmdlineP->inputFileName = strdup("-");  /* he wants stdin */

        else {

            cmdlineP->inputFileName = strdup(argv[2]);

            if (argc-1 > 2)

                pm_error("Too many arguments.  The only possible arguments "

                         "are the body skeleton file name and input image "

                         "file name");

        }

    }

}

typedef enum {

/* The types of object we handle */

    BDATA, IRED, IGREEN, IBLUE, ILUM, FRED, FGREEN, FBLUE, FLUM,

    WIDTH, HEIGHT, POSX, POSY

} SkeletonObjectType;

typedef enum {

    OBJTYP_ICOLOR, OBJTYP_FCOLOR, OBJTYP_INT, OBJTYP_BDATA

} SkeletonObjectClass;

/* Maximum size for a format string ("%d" etc.) */

/* Add one to this size for the terminating '\0'. */

#define MAXFORMAT 16

typedef union {

/* The data we keep for each object */

    struct Bndat {

        char * bdat;   /* Binary data (text with newlines etc.) */

        unsigned int ndat;

    } binData;

    struct Icdat {

        char icformat[MAXFORMAT+1];  /* Integer colors */

        unsigned int icolmin, icolmax;

    } icolData;

    struct Fcdat {

        char fcformat[MAXFORMAT+1];  /* Float colors */

        double fcolmin, fcolmax;

    } fcolData;

    struct Idat {

        char iformat[MAXFORMAT+1];   /* Integer data */

    } iData;

} SkeletonObjectData;

/* Each object has a type and some data */

typedef struct { 

    SkeletonObjectType objType;

    SkeletonObjectData odata;

} SkeletonObject;

#define MAX_SKL_HEAD_OBJ 64

#define MAX_SKL_BODY_OBJ 256

#define MAX_SKL_TAIL_OBJ 64

#define MAX_LINE_BUF 1024

#define MAX_OBJ_BUF 80

static void

dumpSkeleton(SkeletonObject ** const skeletonPList,

             unsigned int      const nSkeleton) {

    unsigned int i;

    pm_message("%u objects", nSkeleton);

    for (i = 0; i < nSkeleton; ++i) {

        SkeletonObject * const skeletonP = skeletonPList[i];

        pm_message("  Object: Type %u", skeletonP->objType);

    }

}

static void

dumpAllSkeleton(SkeletonObject ** const bodySkeletonPList,

                unsigned int      const bodyNskl,

                SkeletonObject ** const headSkeletonPList, 

                unsigned int      const headNskl,

                SkeletonObject ** const tailSkeletonPList,

                unsigned int      const tailNskl) {

    pm_message("Body skeleton:");

    dumpSkeleton(bodySkeletonPList, bodyNskl);

    pm_message("Head skeleton:");

    dumpSkeleton(headSkeletonPList, headNskl);

    pm_message("Tail skeleton:");

    dumpSkeleton(tailSkeletonPList, tailNskl);

}

static void

writeBndat(FILE *           const ofP,

           SkeletonObject * const objectP) {

    struct Bndat * const bdataP = &objectP->odata.binData;

    fwrite(bdataP->bdat, bdataP->ndat, 1, ofP);

}

static void

writeIcol(FILE *           const ofP,

          SkeletonObject * const objectP,

          double           const value) {

    /* Unlike Netpbm, the output format does not have an upper limit for

       maxval.  Here we allow all values representable by unsigned int.

    */

    struct Icdat * const icdataP = &objectP->odata.icolData;

    unsigned int const outValue =

        ROUNDU( icdataP->icolmin +

                ((double)icdataP->icolmax - icdataP->icolmin) * value);

    fprintf(ofP, icdataP->icformat, outValue);

}

static void

writeFcol(FILE *           const ofP,

          SkeletonObject * const objectP,

          double           const value) {

    struct Fcdat * const fcdataP = &objectP->odata.fcolData;

    fprintf(ofP, fcdataP->fcformat,

            (double)

            (fcdataP->fcolmin

             + (fcdataP->fcolmax - fcdataP->fcolmin) * value));

}

static void

writeIdat(FILE *           const ofP,

          SkeletonObject * const objectP,

          unsigned int     const value) {

    struct Idat * const idataP = &objectP->odata.iData;

    fprintf(ofP, idataP->iformat, value);

}

static void

writeText(FILE *            const ofP,

          unsigned int      const nObj,

          SkeletonObject ** const obj,

          unsigned int      const width,

          unsigned int      const height,

          unsigned int      const x,

          unsigned int      const y,

          double            const red,

          double            const green,

          double            const blue) {

    unsigned int i;

    for (i = 0; i < nObj; ++i) {

        switch (obj[i]->objType) {

        case BDATA:

            writeBndat(ofP, obj[i]);

            break;

        case IRED:

            writeIcol(ofP, obj[i], red);

            break;

        case IGREEN:

            writeIcol(ofP, obj[i], green);

            break;

        case IBLUE:

            writeIcol(ofP, obj[i], blue);

            break;

        case ILUM:

            writeIcol(ofP, obj[i],

                      PPM_LUMINR*red + PPM_LUMING*green + PPM_LUMINB*blue);

            break;

        case FRED:

            writeFcol(ofP, obj[i], red);

            break;

        case FGREEN:

            writeFcol(ofP, obj[i], green);

            break;

        case FBLUE:

            writeFcol(ofP, obj[i], blue);

            break;

        case FLUM:

            writeFcol(ofP, obj[i],

                      PPM_LUMINR*red + PPM_LUMING*green + PPM_LUMINB*blue);

            break;

        case WIDTH:

            writeIdat(ofP, obj[i], width);

            break;

        case HEIGHT:

            writeIdat(ofP, obj[i], height);

            break;

        case POSX:

            writeIdat(ofP, obj[i], x);

            break;

        case POSY:

            writeIdat(ofP, obj[i], y);

            break;

        }

    }

}

static SkeletonObjectClass

objClass(SkeletonObjectType const objType) {

    switch (objType) {

    case IRED:

    case IGREEN:

    case IBLUE:

    case ILUM:

        return OBJTYP_ICOLOR;

    case FRED:

    case FGREEN:

    case FBLUE:

    case FLUM:

        return OBJTYP_FCOLOR;

    case WIDTH:

    case HEIGHT:

    case POSX:

    case POSY:

        return OBJTYP_INT;

    case BDATA:

        return OBJTYP_BDATA;

    }

    return 999; /* quiet compiler warning */

}

/*----------------------------------------------------------------------------

  Format string validation

  We validate format strings (such as "%f" "%03d") found in the skeleton files

  for convenience, even though behavior is documented as undefined when the

  user supplies a bogus format string.  Certain strings, most notably those

  with "%n", are especially risky; they pose a security threat.

  On systems with Glibc, we check with parse_printf_format().  On other

  systems we conduct a cursory scan of the characters in the format string,

  looking for characters that trigger non-numeric conversions, etc.

  Documentation for parse_printf_format() is usually available in texinfo

  format on GNU/Linux systems.  As of Dec. 2014 there is no official man page.

  Online documentation is available from:

  https://

  www.gnu.org/software/libc/manual/html_node/Parsing-a-Template-String.html

-----------------------------------------------------------------------------*/

#if HAVE_PARSE_PRINTF_FORMAT

static void

validateParsePrintfFlag(int                const printfConversion,

                        SkeletonObjectType const ctyp,

                        const char **      const errorP) {

/*----------------------------------------------------------------------------

  Assuming 'printfConversion' is the value reported by parse_printf_format()

  as the type of argument a format string requires, 

  return an explanation of how it is incompatible with 'ctyp' as

  *errorP -- return null string if it is compatible.

-----------------------------------------------------------------------------*/

    /* We first check for "%n", then the type modifiers, and finally the

       actual conversion type (char, int, float, double, string or pointer.)

    */

    switch (printfConversion & PA_FLAG_MASK) {

    case PA_FLAG_PTR:  /* This means %n */

        pm_asprintf(errorP, "Contains a %%n conversion specifier");

        break;

    case PA_FLAG_SHORT:

    case PA_FLAG_LONG:

    case PA_FLAG_LONG_LONG:

        /* We omit PA_FLAG_LONG_DOUBLE because it is a synonym for

           PA_FLAG_LONG_LONG: listing both causes compilation errors.

        */

        pm_asprintf(errorP, "Invalid type modifier");

        break;

    default:

        switch (printfConversion & ~PA_FLAG_MASK) {

        case PA_CHAR:

            pm_message("Warning: char type conversion."); 

        case PA_INT:

            if(objClass(ctyp) == OBJTYP_ICOLOR ||

               objClass(ctyp) == OBJTYP_INT )

                *errorP = NULL;

            else

                pm_asprintf(errorP, "Conversion specifier requires a "

                            "character or integer argument, but it is in "

                            "a replacement sequence for a different type");

            break;

        case PA_DOUBLE:

            if(objClass(ctyp) == OBJTYP_FCOLOR)

                *errorP = NULL;

            else

                pm_asprintf(errorP, "Conversion specifier requires a "

                            "double precision floating point argument, "

                            "but it is in "

                            "a replacement sequence for a different type");

            break;

        case PA_FLOAT:

        case PA_STRING:    /* %s */

        case PA_POINTER:   /* %p */

        default:

            pm_asprintf(errorP, "Conversion specifier requires an argument of "

                        "a type that this program never provides for "

                        "any replacement sequence");

        }

    }

}

#endif

#if HAVE_PARSE_PRINTF_FORMAT

static void

validateFormatWithPpf(const char *       const format,

                      SkeletonObjectType const ctyp,

                      const char **      const errorP) {

/*----------------------------------------------------------------------------

  Validate format string 'format' for use with a skeleton of type 'ctyp',

  using the system parse_printf_format() function.

  Return as *errorP an explanation of how it is invalid, or a null string

  if it is valid.

-----------------------------------------------------------------------------*/

    /* We request parse_printf_format() to report the details of the first

       8 conversions.  8 because the maximum length of format is 16 means it

       can have up to 8 conversions: "%d%d%d%d%d%d%d%d".

       Actually this is more than necessary: we are concerned with only the

       first conversion and whether there it is the only one.

    */

    int printfConversion[MAXFORMAT/2] = {0, 0, 0, 0, 0, 0, 0, 0};

    size_t const n =

        parse_printf_format(format, MAXFORMAT/2, printfConversion);

    switch (n) {

    case 0:

        pm_asprintf(errorP, "No transformation found");

        break;

    case 1:

        validateParsePrintfFlag(printfConversion[0], ctyp, errorP);

        break;

    default:

        pm_asprintf(errorP, "Has %lu extra transformation%s ",

                    (unsigned long)n-1, n-1 > 1 ? "s" : "");

        break;

    }

}

#endif

static void

validateFormatOne(char               const typeSpecifier,

                  bool               const isLastInString,

                  SkeletonObjectType const ctyp,

                  bool *             const validatedP,

                  const char **      const errorP) {

    switch (typeSpecifier) {

        /* Valid character encountered.  Skip. */

        /* ' ' (space) is listed here, but should never occur for

           we use sscanf() to parse the fields.

        */

    case ' ': case '-': case '+': case '\'': case '#': case '.':

    case '0': case '1': case '2': case '3': case '4': case '5':

    case '6': case '7': case '8': case '9':

        break;

    case 'c': case 'C':

        pm_message("Warning: char type conversion: %%%c.", typeSpecifier);

    case 'i': case 'd': case 'u': case 'o': case 'x': case 'X':

        if (!isLastInString)

            pm_asprintf(errorP, "Extra characters at end");

        else if(objClass(ctyp) != OBJTYP_ICOLOR &&

                objClass(ctyp) != OBJTYP_INT )

            pm_asprintf(errorP, "Conversion type mismatch");

        else

            *validatedP = true;

        break;

    case 'f': case 'F': case 'g': case 'G': case 'a': case 'A':

        if (!isLastInString)

            pm_asprintf(errorP, "Extra characters at end");

        else if(objClass(ctyp) != OBJTYP_FCOLOR)

            pm_asprintf(errorP, "Conversion type mismatch");

        else

            *validatedP = true;

        break;

    case '\0':

        pm_asprintf(errorP, "No conversion specified");

        break;

    case '%':

        pm_asprintf(errorP, "No more than one %% is allowed");

        break;

    case '$':

    case '*':

        pm_asprintf(errorP, "%c is not allowed", typeSpecifier);

        break;

    case 'h': case 'l': case 'L': case 'q': case 'j': case 'Z': case 't':

        pm_asprintf(errorP, "Modifier %c is not allowed in format",

                    typeSpecifier);

        break;

    case 's': case 'S': case 'm': case 'p': case 'n':

        pm_asprintf(errorP, "Invalid conversion type");

        break;

    default:

        pm_asprintf(errorP, "Abnormal character");

        break;

    }

}

static void

validateFormatGen(const char *       const format,

                  SkeletonObjectType const ctyp,

                  const char **      const errorP)  {

/*----------------------------------------------------------------------------

  Validate format string 'format' for use with a skeleton of type 'ctyp',

  without using the system parse_printf_format() function.

  The string must begin with "%" and end with the translation type character

  ("%d", "%x", "%f", etc.)

  We check only for invalid characters.  Invalid constructs, such as

  "%00.00.00d" will pass this test.

  Return as *errorP an explanation of how it is invalid, or a null string

  if it is valid.

-----------------------------------------------------------------------------*/

    if (format[0] != '%')

        pm_asprintf(errorP, "Does not start with %%");

    else {

        unsigned int i;

        bool validated;

        for (i = 1, validated = false, *errorP = NULL;

             !validated && !*errorP;

             ++i) {

            validateFormatOne(format[i], format[i+1] == '\0', ctyp,

                              &validated, errorP);

        }

    }

}

static void

validateFormat(const char *       const format,

               SkeletonObjectType const ctyp) {

    const char * error;

    if (strlen(format) > MAXFORMAT)

        pm_asprintf(&error, "Too long");

    else {

#if HAVE_PARSE_PRINTF_FORMAT

        if (true)

            validateFormatWithPpf(format, ctyp, &error);

        else  /* Silence compiler warning about unused function */

            validateFormatGen(format, ctyp, &error);

#else

        validateFormatGen(format, ctyp, &error);

#endif

    }

    if (error)

        pm_error("Invalid format string '%s'.  %s", format, error);

}              

static SkeletonObject *

newBinDataObj(unsigned int const nDat, 

              const char * const bdat) {

/*----------------------------------------------------------------------------

  Create a binary data object.

-----------------------------------------------------------------------------*/

    SkeletonObject * objectP;

    objectP = malloc(sizeof(*objectP) + nDat);

    if (!objectP)

        pm_error("Failed to allocate memory for binary data object "

                 "with %u bytes", nDat);

    objectP->objType = BDATA;

    objectP->odata.binData.ndat = nDat;

    objectP->odata.binData.bdat = ((char *)objectP) + sizeof(SkeletonObject);

    memcpy(objectP->odata.binData.bdat, bdat, nDat);

    return objectP;

}

static SkeletonObject *

newIcolDataObj(SkeletonObjectType const ctyp,

               const char *       const format,

               unsigned int       const icolmin,

               unsigned int       const icolmax) {

/*----------------------------------------------------------------------------

  Create integer color data object.

-----------------------------------------------------------------------------*/

    SkeletonObject * objectP;

    MALLOCVAR(objectP);

    if (!objectP)

        pm_error("Failed to allocate memory for an integer color data "

                 "object");

    objectP->objType = ctyp;

    validateFormat(format, ctyp);

    strcpy(objectP->odata.icolData.icformat, format);

    objectP->odata.icolData.icolmin = icolmin;

    objectP->odata.icolData.icolmax = icolmax;

    return objectP;

}

static SkeletonObject *

newFcolDataObj(SkeletonObjectType  const ctyp,

               const char *        const format,

               double              const fcolmin,

               double              const fcolmax) {

/*----------------------------------------------------------------------------

  Create float color data object.

-----------------------------------------------------------------------------*/

    SkeletonObject * objectP;

    MALLOCVAR(objectP);

    if (!objectP)

        pm_error("Failed to allocate memory for a float color data object");

    objectP->objType = ctyp;

    validateFormat(format, ctyp);

    strcpy(objectP->odata.fcolData.fcformat, format);

    objectP->odata.fcolData.fcolmin = fcolmin;

    objectP->odata.fcolData.fcolmax = fcolmax;

    return objectP;

}

static SkeletonObject *

newIdataObj(SkeletonObjectType const ctyp,

            const char *       const format) {

/*----------------------------------------------------------------------------

  Create universal data object.

-----------------------------------------------------------------------------*/

    SkeletonObject * objectP;

    MALLOCVAR(objectP);

    if (!objectP)

        pm_error("Failed to allocate memory for a universal data object");

    objectP->objType = ctyp;

    validateFormat(format, ctyp);

    strcpy(objectP->odata.iData.iformat, format);

    return objectP;

}

static char const escape = '#';

static SkeletonObjectType

interpretObjType(const char * const typstr) {

    SkeletonObjectType objType;

    /* handle integer colors */

    if      (streq(typstr, "ired")  ) objType = IRED;

    else if (streq(typstr, "igreen")) objType = IGREEN;

    else if (streq(typstr, "iblue") ) objType = IBLUE;

    else if (streq(typstr, "ilum")  ) objType = ILUM;

    /* handle real colors */

    else if (streq(typstr, "fred")  ) objType = FRED;

    else if (streq(typstr, "fgreen")) objType = FGREEN;

    else if (streq(typstr, "fblue") ) objType = FBLUE;

    else if (streq(typstr, "flum")  ) objType = FLUM;

    /* handle integer data */

    else if (streq(typstr, "width") ) objType = WIDTH;

    else if (streq(typstr, "height")) objType = HEIGHT;

    else if (streq(typstr, "posx")  ) objType = POSX;

    else if (streq(typstr, "posy")  ) objType = POSY;

    else                              objType = BDATA;

    return objType;

}

static SkeletonObject *

newIcSkelFromReplString(const char *       const icolorObjstr,

                        SkeletonObjectType const objType) {

/*----------------------------------------------------------------------------

  A new skeleton for an integer color substitution specifier (class

  OBJTYP_ICOLOR) whose replacement string (the stuff between the parentheses

  in #(...)) says substitution type 'objType' and the rest of the

  replacement string is 'icolorObjstr'.

-----------------------------------------------------------------------------*/

    SkeletonObject * retval;

    unsigned int icolmin, icolmax;

    char formstr[MAX_OBJ_BUF];

    int nOdata;

    nOdata = sscanf(icolorObjstr, "%s%u%u", formstr, &icolmin, &icolmax);

    if (nOdata == 3)

        retval = newIcolDataObj(objType, formstr, icolmin, icolmax);

    else if (nOdata == EOF) {

        /* No arguments specified.  Use defaults */

        retval = newIcolDataObj(objType, "%u", 0, 255);

    } else

        retval = NULL;

    return retval;

}

static SkeletonObject *

newFcSkelFromReplString(const char *       const fcolorObjstr,

                        SkeletonObjectType const objType) {

/*----------------------------------------------------------------------------

  A new skeleton for a floating point color substitution specifier (class

  OBJTYP_FCOLOR) whose replacement string (the stuff between the parentheses

  in #(...)) says substitution type 'objType' and the rest of the

  replacement string is 'fcolorObjstr'.

-----------------------------------------------------------------------------*/

    SkeletonObject * retval;

    double fcolmin, fcolmax;

    char formstr[MAX_OBJ_BUF];

    int nOdata;

    nOdata = sscanf(fcolorObjstr, "%s%lf%lf", formstr, &fcolmin, &fcolmax);

    if (nOdata == 3)

        retval = newFcolDataObj(objType, formstr, fcolmin, fcolmax);

    else if (nOdata == EOF) {

        /* No arguments specified.  Use defaults */

        retval = newFcolDataObj(objType, "%f", 0.0, 1.0);

    } else

        retval = NULL;

    return retval;

} 

static SkeletonObject *

newISkelFromReplString(const char *       const intObjstr,

                       SkeletonObjectType const objType) {

/*----------------------------------------------------------------------------

  A new skeleton for an integer substitution specifier (class OBJTYP_INT)

  whose replacement string (the stuff between the parentheses in #(...))

  says substitution type 'objType' and the rest of the replacement string is

  'intObjstr'.

-----------------------------------------------------------------------------*/

    SkeletonObject * retval;

    char formstr[MAX_OBJ_BUF];

    int nOdata;

    nOdata = sscanf(intObjstr, "%s", formstr);

    if (nOdata == 1)

        retval = newIdataObj(objType, formstr);

    else if (nOdata == EOF) {

        /* No arguments specified.  Use defaults */

        retval = newIdataObj(objType, "%u");

    } else

        retval = NULL;

    return retval;

} 

static SkeletonObject *

newSkeletonFromReplString(const char * const objstr) {

/*----------------------------------------------------------------------------

  A new skeleton created from the replacement string 'objstr' (the stuff

  between the parentheses in #(...) ).

  Return NULL if it isn't a valid replacement string.

-----------------------------------------------------------------------------*/

    /* We use sscanf() to parse the contents of objstr, giving it a format

       template with the largest number of fields possible plus one extra to

       pick up and check for the existence of invalid trailing characters.  We

       read and discard fields beyond the first, if any.  The appropriate

       new**SkelFromReplString() function determines their contents with a

       separate call to sscanf().

    */

    SkeletonObject * retval;

    char typstr[MAX_OBJ_BUF];

    int typlen;

    SkeletonObjectType objType;

    int conversionCt;

    char s1[MAX_OBJ_BUF];    /* Dry read. */

    char s2[MAX_OBJ_BUF];    /* Extra tailing characters. */

    float f1, f2;            /* Dry read. */ 

    typstr[0] = '\0';  /* initial value */

    conversionCt = sscanf(objstr, "%s%n%s%f%f%s",

                          typstr, &typlen, s1, &f1, &f2, s2);

    switch (conversionCt) {

    case 1: case 2: case 4:

        objType = interpretObjType(typstr);

      break;

    default:

        objType = BDATA;

    }

    switch (objClass(objType)) {

    case OBJTYP_ICOLOR:

        retval = newIcSkelFromReplString(&objstr[typlen], objType);

        break;

    case OBJTYP_FCOLOR:

        retval = newFcSkelFromReplString(&objstr[typlen], objType);

        break;

    case OBJTYP_INT:

        retval = newISkelFromReplString(&objstr[typlen], objType);

        break;

    case OBJTYP_BDATA:

        retval = NULL;

    }

    return retval;

}

static void

readThroughCloseParen(FILE * const ifP,

                      char * const objstr,

                      size_t const objstrSize,