Source Code 1994 March/Source_Code_CD-ROM_Walnut_Creek_March_1994.iso/compsrcs/misc/volume36/chiaro/part13

Text File | 1993-03-25 | 56.0 KB | 1,877 lines

Newsgroups: comp.sources.misc
From: [e-mail] (James W. Birdsall)
Subject: v36i083:  chiaro - Image Utilities, Part13/18
Message-ID: <[e-mail]>
X-Md4-Signature: f722aa48bbec0ab1f49169467a808a54
Date: Fri, 26 Mar 1993 20:28:51 GMT
Approved: [e-mail]

Submitted-by: [e-mail] (James W. Birdsall)
Posting-number: Volume 36, Issue 83
Archive-name: chiaro/part13
Environment: UNIX, Sun, DECstation, 3B1

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then feed it
# into a shell via "sh file" or similar.  To overwrite existing files,
# type "sh file -c".
# Contents:  src/blocproc.c.A src/gifstrip.1 src/pcx.c
# Wrapped by kent@sparky on Thu Mar 25 11:20:06 1993
PATH=/bin:/usr/bin:/usr/ucb:/usr/local/bin:/usr/lbin ; export PATH
echo If this archive is complete, you will see the following message:
echo '          "shar: End of archive 13 (of 18)."'
if test -f 'src/blocproc.c.A' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'src/blocproc.c.A'\"
else
  echo shar: Extracting \"'src/blocproc.c.A'\" \(29781 characters\)
  sed "s/^X//" >'src/blocproc.c.A' <<'END_OF_FILE'
X/***************************************************************************
X*   BLOCPROC.C                                                             *
X*   MODULE:  -                                                             *
X*   OS:      UNIX                                                          *
X*                                                                          *
X*   Copyright (c) 1993 James W. Birdsall. All Rights Reserved.             *
X*                                                                          *
X*   The Graphics Interchange Format(c) is the Copyright property of        *
X*   CompuServe Incorporated. GIF(sm) is a Service Mark property of         *
X*   CompuServe Incorporated.                                               *
X*                                                                          *
X*   GIF and "Graphic Interchange Format" are trademarks (tm) of            *
X*   CompuServe, Inc., an H&R Block company.                                *
X*                                                                          *
X*   $Id: blocproc.c,v 1.6 1993/02/10 01:59:38 jwbirdsa Exp $
X*                                                                          *
X***************************************************************************/
X
X#include "config.h"
X
X/*
X** system includes <>
X*/
X
X#include <stdio.h>
X#ifndef NO_STDLIB
X#include <stdlib.h>
X#endif
X#include <ctype.h>
X#ifndef NO_MALLOCHDR
X#include <malloc.h>
X#endif
X
X
X/*
X** custom includes ""
X*/
X
X#include "depend.h"
X
X#include "fb.h"
X
X#include "formats.h"
X#include "gif.h"
X#include "gld.h"
X
X#include "colors.h"
X
X#include "gifcheck.h"
X#include "blocproc.h"
X
X
X/*
X** local #defines
X*/
X
X/* Sizes of various displays. */
X
X#define HEXLINELEN           8
X#define COLORLINELEN         5
X
X/* Fast decompression overhead. */
X
X#ifndef SMALL_MEM
X#define EXTRA_TABLESIZE      20000
X#else
X#define EXTRA_TABLESIZE      2000
X#endif
X
X
X/*
X** misc: copyright strings, version macros, etc.
X*/
X
Xstatic char CONST rcsid[] = "$Id: blocproc.c,v 1.6 1993/02/10 01:59:38 jwbirdsa Exp $";
X
X
X/*
X** typedefs
X*/
X
X/*
X** global variables
X*/
X
X/* Global color table. */
X
XRGB_TRIPLET *gct = (RGB_TRIPLET *) NULL;
X
X/* Last state. */
X
Xint laststate;
X
X
X/* Default: allow leading junk. */
X
Xextern int lead;
X
X/* Default: do decompression. */
X
Xextern int decomp;
X
X/* Default: don't dump color tables. */
X
Xextern int do_colordump;
X
X/* Default: display FASCINATING and above, abort on VIOLATION and above. */
X
Xextern int dlevel;
Xextern int elevel;
X
X/* Default: terse displays. */
X
Xextern int verbose;
X
X/* Default: don't do hex dump of PTEs, comments, app & generic extensions. */
X
Xextern int do_hexdump;
X
X/* Display progress indicator? */
X
X#ifdef PROGRESS_IND
Xextern int prog_ind;
X#endif
X
X/* File descriptors for standard and error output. */
X
Xextern FILE *outstr;
Xextern FILE *outerr;
X
X/* Global scratch space. */
X
Xextern char scratch[];
X
X
X/*
X** static globals
X*/
X
X/* Global color table stuff. */
X
Xstatic int globcolors;
Xstatic int globsize;
X
X/* Size of logical screen. */
X
Xstatic unsigned int logwid;
Xstatic unsigned int loghi;
X
X/* Transparency index. */
X
Xstatic int transparent = -1;
X
X/* For progress indication. */
X
X#ifdef PROGRESS_IND
Xstatic char clockface[] = "|/-\\";
X#endif
X
X/* State names array. */
X
Xstatic char *state_names[] = { "logical screen descriptor & global color table",
X                               "graphic control extension",
X                               "image",
X                               "plain-text extension",
X                               "generic extension",
X                               "comment extension",
X                               "application extension" };
X
X/* State transition table. */
X
Xstatic int state_trans[STATE_MAX][STATE_MAX] = {
X/*          BEGIN   GCE IMAGE   PTE GENEXT  COMMENT APP TERM */
X/* BEGIN */ 0,      1,  1,      1,  1,      1,      1,  1,
X/* GCE   */ 0,      0,  1,      1,  0,      0,      0,  0,
X/* IMAGE */ 0,      1,  1,      1,  1,      1,      1,  1,
X/* PTE   */ 0,      1,  1,      1,  1,      1,      1,  1,
X/* GEN   */ 0,      1,  1,      1,  1,      1,      1,  1,
X/* COMNT */ 0,      1,  1,      1,  1,      1,      1,  1,
X/* APP   */ 0,      1,  1,      1,  1,      1,      1,  1,
X/* TERM  */ 0,      0,  0,      0,  0,      0,      0,  0 } ;
X
X
X/*
X** function prototypes
X*/
X
X#ifdef  __STDC__
X# define P_(s) s
X#else
X# define P_(s) ()
X#endif
X
Xstatic unsigned int count_unprint P_((UCHAR *data, unsigned int len));
Xstatic VOID hexdump P_((UCHAR *data, unsigned int len));
Xstatic VOID colordump P_((RGB_TRIPLET *ctable, int colors));
X
Xstatic VOID callback P_((long donelen, UCHAR **buffer, long *availlen, long *bufpos));
X
X#undef P_
X
X
X/*
X** functions
X*/
X
X
X/***************************************************************************
X*   FUNCTION: GLOBAL_PRINTOUT                                              *
X*                                                                          *
X*   DESCRIPTION:                                                           *
X*                                                                          *
X*       Prints out info from Logical Screen Descriptor and global color    *
X*       table.                                                             *
X*                                                                          *
X*   ENTRY:                                                                 *
X*                                                                          *
X*       infile   - handle of file                                          *
X*       filename - name of file                                            *
X*       lsd      - LSD data from file                                      *
X*       size     - length of file                                          *
X*                                                                          *
X*   EXIT:                                                                  *
X*                                                                          *
X*       Returns an errorlevel code.                                        *
X*                                                                          *
X*   CONSTRAINTS/SIDE EFFECTS:                                              *
X*                                                                          *
X***************************************************************************/
Xint
X#ifdef __STDC__
Xglobal_printout(FB *infile, char *filename, GIF_LSD *lsd, long size)
X#else
Xglobal_printout(infile, filename, lsd, size)
XFB *infile;
Xchar *filename;
XGIF_LSD *lsd;
Xlong size;
X#endif
X{
X    ULONG status;
X    int loop;
X    long uniques, entries;
X    int chandle;
X    int denom;
X
X    /* Print some info from logical screen descriptor. */
X
X    fprintf(outstr, "FILE %s", filename);
X    if (verbose != 0)
X    {
X        fprintf(outstr, " is GIF version GIF%s:\n",
X                ((GIF_89A == lsd->version) ? "89a" : "87a"));
X        fprintf(outstr, "   file size (bytes): %8ld\n", size);
X        fprintf(outstr,
X                "   logical screen size (pixels, width x height): %5u x %5u\n",
X                lsd->scr_wid, lsd->scr_hi);
X    }
X    else
X    {
X        fprintf(outstr, "   GIF%s   %8ld bytes\n",
X                ((GIF_89A == lsd->version) ? "89a" : "87a"), size);
X        fprintf(outstr, "   logical screen:  %5u x %5u", lsd->scr_wid,
X                lsd->scr_hi);
X    }
X
X    if (lsd->aspect != 0)
X    {
X        if (GIF_89A == lsd->version)
X        {
X            for (denom = 64, loop = lsd->aspect; ((loop & 0x1) == 0);
X                 denom >>= 1, loop >>= 1) ;
X            if (verbose != 0)
X            {
X                fprintf(outstr, "   logical screen aspect ratio: ");
X            }
X            else
X            {
X                fprintf(outstr, "   aspect ");
X            }
X            fprintf(outstr, "%3d/%2d\n", loop, denom);
X        }
X        else
X        {
X            if (dlevel >= DLEVEL_NITPICK)
X            {
X                fprintf(outstr, "\nNITPICK: byte 6 of logical screen descriptor should be 0 for GIF87A\n");
X            }
X        }
X    }
X    else if (GIF_89A == lsd->version)
X    {
X        if (verbose != 0)
X        {
X            fprintf(outstr, "   logical screen aspect ratio not given.\n");
X        }
X        else
X        {
X            fprintf(outstr, "   aspect ---\n");
X        }
X    }
X    else if (0 == verbose)
X    {
X        fputc('\n', outstr);
X    }
X    fprintf(outstr, "   %d bits per color available on source\n", lsd->clr_res);
X    if (verbose != 0)
X    {
X        if (lsd->gct_flag)
X        {
X            fprintf(outstr, "   This file has a global color table.\n");
X        }
X        else
X        {
X            fprintf(outstr,
X                         "   This file does not have a global color table.\n");
X        }
X    }
X
X    /* Save logical screen dimensions. */
X
X    logwid = lsd->scr_wid;
X    loghi = lsd->scr_hi;
X
X    /* Get global color table, if any. */
X
X    if (lsd->gct_flag)
X    {
X        fprintf(outstr, "GLOBAL COLOR TABLE:\n");
X        globcolors = 0x1 << lsd->gct_size;
X        globsize = lsd->gct_size;
X        if (verbose != 0)
X        {
X            fprintf(outstr, "   %d bits per index for a table size of %d\n",
X                    lsd->gct_size, globcolors);
X        }
X        else
X        {
X            fprintf(outstr, "   %d bits (%d colors)", lsd->gct_size,
X                    globcolors);
X        }
X        if (lsd->sort_flag)
X        {
X            if (GIF_89A == lsd->version)
X            {
X                if (verbose != 0)
X                {
X                    fprintf(outstr, "   The global color table is sorted by decreasing importance.\n");
X                }
X                else
X                {
X                    fprintf(outstr, "   sorted  ");
X                }
X            }
X            else
X            {
X                if (dlevel >= DLEVEL_NITPICK)
X                {
X                    fprintf(outstr, "\nNITPICK: bit 3, byte 4 of logical screen descriptor should be 0 for GIF87A\n");
X                }
X            }
X        }
X        else if (GIF_89A == lsd->version)
X        {
X            if (verbose != 0)
X            {
X                fprintf(outstr, "   The global color table is not sorted.\n");
X            }
X            else
X            {
X                fprintf(outstr, "   unsorted");
X            }
X        }
X
X        if ((status = gif_gctget(infile, &gct, globcolors)) != ST_SUCCESS)
X        {
X            fprintf(outerr, "%s\n", errxlate(status));
X            fb_close(infile);
X            return ((GIF_UNEOF_E == status) ? EXIT_UNEOF : EXIT_ERROR);
X        }
X
X        if (verbose != 0)
X        {
X            fprintf(outstr,
X                    "   background index %d, RGB value %03d/%03d/%03d\n",
X                    lsd->background, gct[lsd->background].red,
X                    gct[lsd->background].green, gct[lsd->background].blue);
X        }
X        else
X        {
X            fprintf(outstr, "   bg index %d (%03d/%03d/%03d)\n",
X                    lsd->background, gct[lsd->background].red,
X                    gct[lsd->background].green, gct[lsd->background].blue);
X        }
X
X        if ((chandle = col_open()) != 0)
X        {
X            fprintf(outerr, "ERROR: Cannot open color hash table.\n");
X            fb_close(infile);
X            return EXIT_ERROR;
X        }
X        for (loop = 0; loop < globcolors; loop++)
X        {
X            if (col_enter(chandle, &(gct[loop])) != 0)
X            {
X                fprintf(outerr, "ERROR: Error entering in color hash table.\n");
X                col_close(chandle, (HASHIT **) NULL);
X                fb_close(infile);
X                return EXIT_ERROR;
X            }
X        }
X        if (col_getstat(chandle, &uniques, &entries) != 0)
X        {
X            fprintf(outerr, "ERROR: Error retrieving from color hash table.\n");
X            col_close(chandle, (HASHIT **) NULL);
X            fb_close(infile);
X            return EXIT_ERROR;
X        }
X        fprintf(outstr, "   %ld unique colors.\n", uniques);
X        if (col_close(chandle, (HASHIT **) NULL) != 0)
X        {
X            fprintf(outerr, "ERROR: Error closing color hash table.\n");
X            fb_close(infile);
X            return EXIT_ERROR;
X        }
X
X        if (do_colordump)
X        {
X            colordump(gct, globcolors);
X        }
X    }
X    else
X    {
X        fprintf(outstr,
X                "   No global color table, table size field has value %d.\n",
X                lsd->gct_size);
X    }
X
X    /* Return OK. */
X
X    return EXIT_OK;
X} /* end of global_printout() */
X
X
X/***************************************************************************
X*   FUNCTION: IMAGE_PRINTOUT                                               *
X*                                                                          *
X*   DESCRIPTION:                                                           *
X*                                                                          *
X*       Prints out info from Image Descriptor, local color table (if any), *
X*       and decompresses image.                                            *
X*                                                                          *
X*   ENTRY:                                                                 *
X*                                                                          *
X*       infile   - handle of file                                          *
X*       imd      - Image Descriptor data from file                         *
X*       version  - GIF format version                                      *
X*       gct_size - size of global color table                              *
X*                                                                          *
X*   EXIT:                                                                  *
X*                                                                          *
X*       Returns an errorlevel code.                                        *
X*                                                                          *
X*   CONSTRAINTS/SIDE EFFECTS:                                              *
X*                                                                          *
X***************************************************************************/
Xint
X#ifdef __STDC__
Ximage_printout(FB *infile, GIF_IMD *imd, int images, ULONG version,
X               int gct_size)
X#else
Ximage_printout(infile, imd, images, version, gct_size)
XFB *infile;
XGIF_IMD *imd;
Xint images;
XULONG version;
Xint gct_size;
X#endif
X{
X    ULONG status;
X    int colors;
X    int loop;
X    ULONG blockbytes;
X    unsigned int blocks;
X    long uniques, entries;
X    int chandle;
X    codeinfo *table;
X    UCHAR *holding_space;
X    int clockseq = 0;
X    long cratio;
X    int compon = 1;
X    unsigned int endblock;
X
X    RGB_TRIPLET *ctable = (RGB_TRIPLET *) NULL;
X    UCHAR codesize;
X    UCHAR *data;
X    int datalen;
X
X    /* Print some info from image descriptor. */
X
X    if (verbose != 0)
X    {
X        fprintf(outstr, "   image size (pixels, width x height): %5u x %5u\n",
X                imd->im_wid, imd->im_hi);
X        fprintf(outstr, "   image upper left corner (column, row): %5u, %5u\n",
X                imd->im_left, imd->im_top);
X        fprintf(outstr, "   image is stored %s\n",
X                ((0 == imd->interlace_flag) ? "sequentially" : "interlaced"));
X    }
X    else
X    {
X        fprintf(outstr, "   size %5u x %5u   corner %5u, %5u   %s\n",
X                imd->im_wid, imd->im_hi, imd->im_left, imd->im_top,
X                ((0 == imd->interlace_flag) ? "sequentially" : "interlaced"));
X    }
X
X    if ((imd->raw_packed & 0x18) != 0)
X    {
X        if (dlevel >= DLEVEL_NITPICK)
X        {
X            fprintf(outstr, "\nNITPICK: bits 3 and 4, byte 9 of image descriptor should be 0\n");
X        }
X    }
X
X    if (((imd->im_left + imd->im_wid) > logwid) ||
X        ((imd->im_top + imd->im_hi) > loghi))
X    {
X        if (dlevel >= DLEVEL_VIOLATION)
X        {
X            fprintf(outstr,
X                    "\nVIOLATION: image does not fit on logical screen.\n");
X        }
X        if (elevel >= ELEVEL_VIOLATION)
X        {
X            fb_close(infile);
X            return EXIT_NOTGIF;
X        }
X    }
X
X    if (imd->lct_flag)
X    {
X        fprintf(outstr, "   This image has a local color table.\n");
X    }
X    else
X    {
X        fprintf(outstr, "   This image uses the global color table (no local color table).\n");
X        if (((RGB_TRIPLET *) NULL) == gct)
X        {
X            if (dlevel >= DLEVEL_FASCINATING)
X            {
X                fprintf(outstr, "\nFASCINATING: this file does not contain a global color table\n");
X            }
X            if (elevel >= ELEVEL_FASCINATING)
X            {
X                fb_close(infile);
X                return EXIT_NOTGIF;
X            }
X        }
X    }
X
X    /* Read local color table, if any. */
X
X    if (imd->lct_flag)
X    {
X        fprintf(outstr, "   LOCAL COLOR TABLE FOR IMAGE %d:\n", images);
X        colors = 0x1 << imd->lct_size;
X        if (verbose != 0)
X        {
X            fprintf(outstr, "   %d bits per index for a table size of %d\n",
X                    imd->lct_size, colors);
X        }
X        else
X        {
X            fprintf(outstr, "   %d bits (%d colors)", imd->lct_size, colors);
X        }
X        if (imd->sort_flag)
X        {
X            if (GIF_89A == version)
X            {
X                if (verbose != 0)
X                {
X                    fprintf(outstr, "   The local color table is sorted by decreasing importance.\n");
X                }
X                else
X                {
X                    fprintf(outstr, "   sorted\n");
X                }
X            }
X            else
X            {
X                if (dlevel >= DLEVEL_NITPICK)
X                {
X                    fprintf(outstr, "\nNITPICK: bit 5, byte 9 of image descriptor should be 0 for GIF87A\n");
X                }
X            }
X        }
X        else if (GIF_89A == version)
X        {
X            if (verbose != 0)
X            {
X                fprintf(outstr, "   The local color table is not sorted.\n");
X            }
X            else
X            {
X                fprintf(outstr, "   unsorted\n");
X            }
X        }
X
X        if ((status = gif_lctget(infile, &ctable, colors)) != ST_SUCCESS)
X        {
X            fprintf(outerr, "%s\n", errxlate(status));
X            fb_close(infile);
X            return ((GIF_UNEOF_E == status) ? EXIT_UNEOF : EXIT_ERROR);
X        }
X
X        if ((chandle = col_open()) != 0)
X        {
X            fprintf(outerr, "ERROR: Cannot open color hash table.\n");
X            if (imd->lct_flag)
X            {
X                free(ctable);
X            }
X            fb_close(infile);
X            return EXIT_ERROR;
X        }
X        for (loop = 0; loop < colors; loop++)
X        {
X            if (col_enter(chandle, &(ctable[loop])) != 0)
X            {
X                fprintf(outerr, "ERROR: Error entering in color hash table.\n");
X                col_close(chandle, (HASHIT **) NULL);
X                fb_close(infile);
X                if (imd->lct_flag)
X                {
X                    free(ctable);
X                }
X                return EXIT_ERROR;
X            }
X        }
X        if (col_getstat(chandle, &uniques, &entries) != 0)
X        {
X            fprintf(outerr, "ERROR: Error retrieving from color hash table.\n");
X            col_close(chandle, (HASHIT **) NULL);
X            fb_close(infile);
X            if (imd->lct_flag)
X            {
X                free(ctable);
X            }
X            return EXIT_ERROR;
X        }
X        fprintf(outstr, "   %ld unique colors.\n", uniques);
X        if (col_close(chandle, (HASHIT **) NULL) != 0)
X        {
X            fprintf(outerr, "ERROR: Error closing color hash table.\n");
X            fb_close(infile);
X            if (imd->lct_flag)
X            {
X                free(ctable);
X            }
X            return EXIT_ERROR;
X        }
X
X        if (do_colordump)
X        {
X            colordump(ctable, colors);
X        }
X    }
X    else
X    {
X        if ((imd->lct_size != 0) && (dlevel >= DLEVEL_NITPICK))
X        {
X            fprintf(outstr, "\nNITPICK: local color table size is nonzero.\n");
X        }
X    }
X
X    /* Check for transparency. */
X
X    if (transparent != -1)
X    {
X        if (transparent > ((imd->lct_flag != 0) ? colors : globcolors))
X        {
X            if (dlevel >= DLEVEL_VIOLATION)
X            {
X                fprintf(outstr, "\nVIOLATION: bad transparency index (%d)\n",
X                        transparent);
X            }
X            if (elevel >= ELEVEL_VIOLATION)
X            {
X                fb_close(infile);
X                if (imd->lct_flag)
X                {
X                    free(ctable);
X                }
X                return EXIT_NOTGIF;
X            }
X        }
X    }
X    transparent = -1;
X
X    /* Read codesize. */
X
X    codesize = (UCHAR) fb_getc(infile);
X    if (fb_error != ST_SUCCESS)
X    {
X        fprintf(outerr, "%s\n", errxlate(status));
X        fb_close(infile);
X        if (imd->lct_flag)
X        {
X            free(ctable);
X        }
X        return ((FB_EOF_W == status) ? EXIT_UNEOF : EXIT_ERROR);
X    }
X    fprintf(outstr, "   IMAGE DATA FOR IMAGE %d:\n", images);
X    fprintf(outstr, "   code size %d bits\n", (int) codesize);
X
X    /* Initialize decompressor. */
X
X    if (decomp != 0)
X    {
X        table = (codeinfo *) calloc(CODES, sizeof(codeinfo));
X        if (((codeinfo *) NULL) == table)
X        {
X            fprintf(outerr,
X                    "ERROR: Cannot allocate memory for decompressor table.\n");
X            fb_close(infile);
X            if (imd->lct_flag)
X            {
X                free(ctable);
X            }
X            return EXIT_ERROR;
X        }
X        holding_space = (UCHAR *) malloc(EXTRA_TABLESIZE);
X        if (((UCHAR *) NULL) == holding_space)
X        {
X            fprintf(outerr,
X                    "ERROR: Cannot allocate memory for decompressor table.\n");
X            fb_close(infile);
X            if (imd->lct_flag)
X            {
X                free(ctable);
X            }
X            return EXIT_ERROR;
X        }
X        status = gld_init(codesize, (imd->lct_flag ? imd->lct_size : gct_size),
X                          table, holding_space, EXTRA_TABLESIZE);
X        if (status != ST_SUCCESS)
X        {
X            fprintf(outerr, "%s\n", errxlate(status));
X            fb_close(infile);
X            if (imd->lct_flag)
X            {
X                free(ctable);
X            }
X            return EXIT_ERROR;
X        }
X    }
X
X    /* Read data blocks until done. */
X
X    blockbytes = 0;
X    blocks = 0;
X#ifdef PROGRESS_IND
X    if (prog_ind != 0)
X    {
X        fputc(clockface[(clockseq % 4)], outstr);
X        clockseq++;
X    }
X#endif
X    while (1)
X    {
X        /* Read block. */
X
X        if ((status = gif_readblock(infile, &data, &datalen)) != ST_SUCCESS)
X        {
X#ifdef PROGRESS_IND
X            if (prog_ind != 0)
X            {
X                fputc('\10', outstr);
X            }
X#endif
X            fprintf(outerr, "%s\n", errxlate(status));
X            fprintf(outstr, "\n   %ld good codes found yielding %lu pixels ",
X                    gld_codes, gld_pixout);
X            fprintf(outstr, " (%lu", (gld_pixout / imd->im_wid));
X            if ((gld_pixout % imd->im_wid) != 0)
X            {
X                fputc('+', outstr);
X            }
X            fprintf(outstr, " lines, %lu%% of image)\n",
X                    ((100L * gld_pixout) / ((ULONG) imd->im_wid *
X                                            (ULONG) imd->im_hi)));
X            fb_close(infile);
X            if (imd->lct_flag)
X            {
X                free(ctable);
X            }
X            if (decomp != 0)
X            {
X                free(table);
X                free(holding_space);
X            }
X            return ((GIF_UNEOF_E == status) ? EXIT_UNEOF : EXIT_ERROR);
X        }
X
X        /* Check length. */
X
X        if (0 == datalen)
X        {
X            /* If zero length, at end. */
X
X            if (0 == compon)
X            {
X                /* Compression already turned off -- reached end of codes. */
X
X                break;
X            }
X            if (0 == decomp)
X            {
X                /*
X                ** Not doing decompression -- all OK. Set endblock so don't
X                ** get message about extra blocks
X                */
X
X                endblock = blocks - 1;
X                break;
X            }
X            fprintf(outerr,
X                    "\nANOMALY: end of data reached before end of codes\n");
X            fprintf(outstr, "   %ld good codes found yielding %lu pixels ",
X                    gld_codes, gld_pixout);
X            fprintf(outstr, " (%lu", (gld_pixout / imd->im_wid));
X            if ((gld_pixout % imd->im_wid) != 0)
X            {
X                fputc('+', outstr);
X            }
X            fprintf(outstr, " lines, %lu%% of image)\n",
X                    ((100L * gld_pixout) / ((ULONG) imd->im_wid *
X                                            (ULONG) imd->im_hi)));
X            /* Set endblock so don't get message about extra blocks. */
X            endblock = blocks - 1;
X            break;
X        }
X
X        /* Do decompression. */
X
X        if ((decomp != 0) && (compon != 0))
X        {
X            status = gld_process(datalen, data, NULL, 0, callback);
X            if ((status != ST_SUCCESS) && (status != GLD_EOI_S))
X            {
X#ifdef PROGRESS_IND
X                if (prog_ind != 0)
X                {
X                    fputc('\10', outstr);
X                }
X#endif
X                fprintf(outerr,
X                  "\nANOMALY: decompression error in block %u at offset %ld\n",
X                  blocks, (fb_tell(infile) - datalen));
X                fprintf(outstr, "   %ld good codes found yielding %lu pixels ",
X                        gld_codes, gld_pixout);
X                fprintf(outstr, " (%lu", (gld_pixout / imd->im_wid));
X                if ((gld_pixout % imd->im_wid) != 0)
X                {
X                    fputc('+', outstr);
X                }
X                fprintf(outstr, " lines, %lu%% of image)\n",
X                        ((100L * gld_pixout) / ((ULONG) imd->im_wid *
X                                                (ULONG) imd->im_hi)));
X                fb_close(infile);
X                if (decomp != 0)
X                {
X                    free(table);
X                    free(holding_space);
X                }
X                if (imd->lct_flag)
X                {
X                    free(ctable);
X                }
X                return EXIT_ERROR;
X            }
X            if (GLD_EOI_S == status)
X            {
X#ifdef PROGRESS_IND
X                if (prog_ind != 0)
X                {
X                    fputc('\10', outstr);
X                }
X#endif
X                fprintf(outstr, "   Reached end of codes in block %u\n",
X                        blocks);
X                endblock = blocks;
X                compon = 0;
X            }
X        }
X#ifdef PROGRESS_IND
X        if (prog_ind != 0)
X        {
X            fputc('\10', outstr);
X            fputc(clockface[(clockseq++ % 4)], outstr);
X        }
X#endif
X        blockbytes += (ULONG) datalen;
X        blocks++;
X
X        /* Free data block. */
X
X        free(data);
X    }
X
X    /* Check for extra blocks. */
X
X    if ((blocks - 1) != endblock)
X    {
X        if (dlevel >= DLEVEL_FASCINATING)
X        {
X            fprintf(outstr,
X                    "\n   FASCINATING: %u extra blocks on end of image\n",
X                    ((blocks - 1) - endblock));
X        }
X        if (elevel >= ELEVEL_FASCINATING)
X        {
X            fb_close(infile);
X            if (imd->lct_flag)
X            {
X                free(ctable);
X            }
X            return EXIT_NOTGIF;
X        }
X    }
X
X    /* If doing decompression, clean up. */
X
X    if (decomp != 0)
X    {
X        free(table);
X        free(holding_space);
X    }
X
X    /* Print more info. */
X
X    fprintf(outstr, "   totals: ");
X    if (decomp != 0)
X    {
X        fprintf(outstr, "%ld codes packed into ", gld_codes);
X    }
X    fprintf(outstr, "%lu bytes in %u blocks\n", blockbytes, blocks);
X    if (decomp != 0)
X    {
X        fprintf(outstr, "        %lu pixels extracted\n", gld_pixout);
X        if (gld_pixout < ((ULONG) imd->im_wid * (ULONG) imd->im_hi))
X        {
X            if (dlevel >= DLEVEL_FASCINATING)
X            {
X                fprintf(outstr, "\nFASCINATING: too few pixels extracted ");
X                fprintf(outstr, "(%lu", (gld_pixout / imd->im_wid));
X                if ((gld_pixout % imd->im_wid) != 0)
X                {
X                    fputc('+', outstr);
X                }
X                fprintf(outstr, " lines found, %lu pixels missing)\n",
X                        (((ULONG) imd->im_wid *
X                          (ULONG) imd->im_hi) - gld_pixout));
X            }
X            if (elevel >= ELEVEL_FASCINATING)
X            {
X                fb_close(infile);
X                if (imd->lct_flag)
X                {
X                    free(ctable);
X                }
X                return EXIT_NOTGIF;
X            }
X        }
X        else if (gld_pixout > ((ULONG) imd->im_wid * (ULONG) imd->im_hi))
X        {
X            if (dlevel >= DLEVEL_FASCINATING)
X            {
X                fprintf(outstr, "\nFASCINATING: too many pixels extracted ");
X                fprintf(outstr, " (%lu extra)\n",
X                        (gld_pixout - ((ULONG) imd->im_wid *
X                                       (ULONG) imd->im_hi)));
X            }
X            if (elevel >= ELEVEL_FASCINATING)
X            {
X                fb_close(infile);
X                if (imd->lct_flag)
X                {
X                    free(ctable);
X                }
X                return EXIT_NOTGIF;
X            }
X        }
X    }
X    if (gld_clears >= 1)
X    {
X        fprintf(outstr, "        code table cleared %d times\n", gld_clears);
X    }
X    else if (decomp != 0)
X    {
END_OF_FILE
  if test 29781 -ne `wc -c <'src/blocproc.c.A'`; then
    echo shar: \"'src/blocproc.c.A'\" unpacked with wrong size!
  elif test -f 'src/blocproc.c.B'; then
    echo shar: Combining  \"'src/blocproc.c'\" \(64047 characters\)
    cat 'src/blocproc.c.A' 'src/blocproc.c.B' > 'src/blocproc.c'
    if test 64047 -ne `wc -c <'src/blocproc.c'`; then
      echo shar: \"'src/blocproc.c'\" combined with wrong size!
    else
      rm src/blocproc.c.A src/blocproc.c.B
    fi
  fi
  # end of 'src/blocproc.c.A'
fi
if test -f 'src/gifstrip.1' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'src/gifstrip.1'\"
else
  echo shar: Extracting \"'src/gifstrip.1'\" \(10723 characters\)
  sed "s/^X//" >'src/gifstrip.1' <<'END_OF_FILE'
X.\"
X.\" $Id: gifstrip.1,v 1.3 1993/03/02 00:44:17 jwbirdsa Exp $
X.\"
X.TH GIFSTRIP 1 "$Date: 1993/03/02 00:44:17 $"
X.PD 1
X.SH NAME
Xgifstrip \- GIF file rebuilder
X.SH SYNOPSIS
X.B gifstrip
X[
X.B \-b
X][
X.B \-r
X][
X.B \-\-
X][
X.B \-f
X][
X.B \-n
X][
X.B \-m
X][
X.B \-o
X][
X.B \-h
X][
X.B \-c
X][
X.B \-d
X][
X.B \-s
X][
X.B \-tpath
X] target [ target... ]
X.br
X.SH DESCRIPTION
X.I Gifstrip
Xis used to remove excess characters from the beginning and/or end of a GIF
Xfile (usually the end). These excess characters may be added in a variety
Xof ways, including XMODEM-protocol file transfers or transfer from a
XMacintosh computer.
X.I Gifstrip
Xalso does some basic file analysis and enforces a few format requirements
Xwhich are sometimes ignored. For temporary storage, it can use memory or
Xdisk. By default, it uses memory first and only uses disk space to make up
Xthe shortfall if there is not enough memory. By default,
X.I gifstrip
Xalso keeps the original file around until the new file has been written to
Xdisk successfully, and attempts to preserve the timestamp, owner, and
Xpermissions of the original file.
X.SH TARGETS
XA target is a filename or directory. Multiple targets may be specified on
Xthe command line. If a target is a directory, all files in that directory
Xwill be processed. If no targets are specified on the command line, a usage
Xmessage will be printed.
X.SH OPTIONS
XOptions may not be combined. In the case of the
X.B \-t
Xoption, there cannot be a space between the option and the argument to the
Xoption.
X.TP
X.B \-b
XOperate in batch mode. All output is suppressed. This option should be
Xfirst on the command line or other options may generate output before this
Xoption is found. When in batch mode,
X.I gifstrip
Xadjusts its status return to reflect the results of processing. The status
Xmay be:
X.RS 10
X.PP
X.nf
X0     the file is GIF format and did not need
X       stripping, or was stripped OK
X1     file is not GIF format
X2     an unexpected EOF was encountered
X       (usually indicates a corrupt file)
X3     any other error
X.fi
X.RE
X.RS 5
X.PP
XNote that the status reflects the result of only the last file processed.
XTherefore, in batch mode only one file should be specified on the command
Xline.
X.RE
X.TP
X.B \-\-
XRead targets from stdin. The list of targets must have only one target per
Xline. Targets which are directories will be expanded as usual, but
Xwildcards will not be expanded. Targets on the command line will be ignored.
XFor use with the
X.B \-f
Xoption of
X.I
Xchils.
X.TP
X.B \-r
XRedirects error messages to stderr.
X.TP
X.B \-f
XForces
X.I gifstrip
Xto rebuild the file. Normally, files are rebuilt only when extra characters
Xare found or if the file does not meet strict format requirements (see the
X.B \-n
Xoption below).
X.TP
X.B \-m
XEnables the stripping of files which have excess characters at the
Xbeginning. Ordinarily, such files are not recognized as GIF format files.
XWith this option,
X.I gifstrip
Xsearches through the file looking for the GIF format signature, and starts
Xrebuilding the file when it finds it. Files without excess characters at
Xthe beginning will be processed normally.
X.TP
X.B \-n
XDisables strict format checking. Normally, the following violations are
Xchecked for, and the file rebuilt if any are found:
X.RS 10
X.PP
X.nf
X(GIF87a only)    Global or local color table sorted
X                  flag set
X(GIF87a only)    Aspect ratio value nonzero
X(GIF87a, GIF89a) Local color table size given but local
X                  color table flag not set (no local
X                  color table)
X(GIF89a only)    Local color table sorted flag set but
X                  local color table flag not set (no
X                  local color table)
X.fi
X.RE
X.RS 5
X.PP
XIf the
X.B \-n
Xoption is used, these violations are ignored. If the file is rebuilt due to
Xexcess characters, any violations will be propagated into the rebuilt
Xfile.
X.RE
X.TP
X.B \-o
XErases the original file before writing the rebuilt file. By default,
X.I gifstrip
Xretains the original file until the rebuilt file has been completely
Xwritten to disk. Thus, in case of error, either the original file or the
Xrebuilt file will exist on disk no matter when
X.I gifstrip
Xis aborted, providing a measure of security. However, sometimes it is
Xnecessary to process a file which is on a nearly-full drive, with
Xinsufficient room for a second copy of the file. This option allows for
Xthat case.
X.TP
X.B \-h
XPrints a usage message. No files are processed and all other options are
Xignored.
X.TP
X.B \-c
XDisables use of memory for temporary storage. Cannot be combined with the
X.B \-d
Xoption.
X.TP
X.B \-d
XDisables use of disk for temporary storage. Cannot be combined with the
X.B \-c
Xoption.
X.TP
X.B \-s
XEquivalent to
X.B \-c.
X.TP
X.B \-tpath
XSpecifies a path for the disk temporary file. There must not be space
Xbetween the "-t" and the path.
X.SH OUTPUT
X.I Gifstrip
Xproduces at least two lines of output for each file. In some cases, it may
Xproduce several pages of output.
X.PP
XFor each file specified,
X.I gifstrip
Xoutputs the line "Processing
X.IR filename ...
X". If the file is not a GIF format file,
X.I gifstrip
Xthen outputs the message "ERROR: File is not a GIF format file." and
Xproceeds to the next file.
X.RS 3
X.SS "FILE HEADER LINE"
X.nf
XGIF87A  G--   21463    250 x   200 @ 128   junk/vla.gif
XGIF89A  G-A   34256    320 x   200 @ 256   junk/glass.gif
X.fi
X.PP
XThe columns from left to right are:
X.RS 3
X.PD 0
X.HP
X\(bu  the format identifier (GIF87A or GIF89A)
X.HP
X\(bu  G file has a global color table
X.HP
X   - file does not have a global color table
X.HP
X\(bu  S global color table is sorted
X.HP
X   - global color table is not sorted
X.HP
X\(bu  A aspect ratio is specified
X.HP
X   - no aspect ratio
X.HP
X\(bu  the file size
X.HP
X\(bu  the width in pixels of the logical screen
X.HP
X\(bu  the height in pixels of the logical screen
X.HP
X\(bu  the number of colors in the global color table (--- if no global
Xcolor table)
X.HP
X\(bu  the filename
X.PD 1
X.RE
X.PP
XIf
X.I gifstrip
Xencounters in the file header one of the format violations listed under the
X.B \-n
Xoption, and the
X.B \-n
Xoption is not in effect, it will print a message describing the violation
Xafter the file header line. This message will start with "FYI:".
X.SS "IMAGE LINE"
X.nf
XG-S  (  0,  0)    250 x   200 @ 128   20970BY    83BL
X.fi
X.PP
XThe columns from left to right are:
X.RS 3
X.PD 0
X.HP
X\(bu  G image uses global color table
X.HP
X   L image uses local color table
X.HP
X\(bu  S local color table is sorted
X.HP
X   - local color table is not sorted
X.HP
X\(bu  S image is stored sequentially
X.HP
X   I image is stored interlaced
X.HP
X\(bu  offset of upper left corner of the image on the logical screen,
X(horizontal,vertical)
X.HP
X\(bu  the width in pixels of the image
X.HP
X\(bu  the height in pixels of the image
X.HP
X\(bu  the number of colors in either the global or local color table,
Xwhichever the image uses
X.HP
X\(bu  the number of data bytes in the image
X.HP
X\(bu  the number of blocks into which the data bytes are broken up
X.PD 1
X.RE
X.PP
XIf
X.I gifstrip
Xencounters in an image one of the format violations listed under the
X.B \-n
Xoption, and the
X.B \-n
Xoption is not in effect, it will print a mesasge describing the violation
XBEFORE it prints the image line for that image. This message will start
Xwith "FYI:".
X.SS "EXTENSION BLOCK LINE"
XWhen an extension block is encountered,
X.I gifstrip
Xwill print one of several lines. If the format is GIF87a, or the extension
Xblock is not one of the four dedicated types defined in GIF89a,
X.I gifstrip
Xprints:
X.PP
X.RS 3
XType
X.I xxx
XExtension Block
X.RE
X.PP
Xwhere xxx is the type number given in the extension block header. If it is
Xone of the four dedicated types defined in GIF89a,
X.I gifstrip
Xprints:
X.PP
X.nf
X   Plain Text Extension Block
X   Graphic Control Extension Block
X   Comment Extension Block
X   Application Extension Block
X.fi
X.PP
Xas appropriate.
X.PP
XAfter identifying the extenion type,
X.I gifstrip
Xprints the number of data bytes and data blocks in the extension block, on
Xthe same line, in the same format as for an image.
X.SS "TERMINATOR LINE"
XIf the file is not corrupt,
X.I gifstrip
Xwill eventually come to the GIF format terminator character. When it
Xencounters this, it prints:
X.PP
X.nf
X   GIF Terminator
X.fi
X.PP
Xand ceases processing the original file. It then determines whether the
Xfile needs to be rebuilt or not.
X.SS "NO REBUILD"
XIf the file does not have excess characters on either the beginning or the
Xend, and either does not have any format violations or the
X.B \-n
Xoption is in effect, and the
X.B \-f
Xoption is not in effect, the file will not be rebuilt.
X.I Gifstrip
Xprints:
X.PP
X.nf
X   No work to be done. File unchanged.
X.fi
X.PP
Xand proceeds to the next file.
X.SS REBUILD
XIf the file does need to be rebuilt,
X.I gifstrip
Xprints:
X.PP
X.nf
X    New size:    xxx   Bytes removed:    yyy
XRecopying... done.
X.fi
X.PP
Xwhere xxx is the size in bytes of the rebuilt file, and yyy is the
Xdifference between the size of the original file and the size of the
Xrebuilt file. The next line ("Recopying...") is simply to indicate that
X.I gifstrip
Xis doing something. When
X.I gifstrip
Xprints "done." it is finished writing the rebuilt file and proceeds to the
Xnext file. The timestamp, owner, and permissions of the original file are
Xpreserved as well as possible in the rebuilt file.
X.SS "OTHER LINES"
X.I Gifstrip
Xmay issue error messages at any time. These will begin with "WARNING:",
X"ERROR:", or "FATAL ERROR:".
X.PP
XThere are two other messages that
X.I gifstrip
Xmay issue:
X.PP
XIf
X.I gifstrip
Xis used with the
X.B \-m
Xoption and encounters excess characters at the beginning of a file, it
Xprints an "FYI:" message stating that leading junk bytes have been skipped
Xover and gives the number of bytes skipped. This message appears before the
Xfile header line.
X.PP
XIf
X.I gifstrip
Xencounters extraneous characters between sections, it will issue an "FYI:"
Xmessage describing the violation and giving the number of extraneous
Xcharacters. This message appears between the lines describing the sections
Xon either side of the extraneous characters. This is an FYI message
Xbecause, technically,
X.I gifstrip
Xcan fix the problem. However, extraneous characters between sections are
Xforbidden by the format specification. If present, they indicate a serious
Xproblem in the encoder which produced the image, or, more likely, a corrupt
XGIF file.
X.RE
X.SH COPYRIGHT
X.I Gifstrip
Xis copyright 1993 by James W. Birdsall, all rights reserved.
X.PP
XThe Graphics Interchange Format(c) is the Copyright property of CompuServe
XIncorporated. GIF(sm) is a Service Mark property of CompuServe
XIncorporated.
X.SH AUTHOR
XJames W. Birdsall
X.RS 3
X.nf
[e-mail]
Xuunet!uw-coco!amc-gw!picarefy!support
XCompuServe: 71261,1731
XGEnie: J.BIRDSALL2
X.fi
X.RE
X.SH "SEE ALSO"
Xchils(1),
Xgifcheck(1)
END_OF_FILE
  if test 10723 -ne `wc -c <'src/gifstrip.1'`; then
    echo shar: \"'src/gifstrip.1'\" unpacked with wrong size!
  fi
  # end of 'src/gifstrip.1'
fi
if test -f 'src/pcx.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'src/pcx.c'\"
else
  echo shar: Extracting \"'src/pcx.c'\" \(12105 characters\)
  sed "s/^X//" >'src/pcx.c' <<'END_OF_FILE'
X/***************************************************************************
X*   PCX.C                                                                  *
X*   MODULE:  PCX                                                           *
X*   OS:      UNIX                                                          *
X*                                                                          *
X*   Copyright (c) 1993 James W. Birdsall. All Rights Reserved.             *
X*                                                                          *
X*   $Id: pcx.c,v 1.1 1993/03/02 00:57:05 jwbirdsa Exp $
X*                                                                          *
X*   This file contains functions to process PCX format files.              *
X*   Functions:                                                             *
X*      pcx_verify    - checks filename to see if it is an PCX file         *
X*      pcx_getheader - extracts header data from PCX file                  *
X*                                                                          *
X*      pcx_errstring - converts error code into message                    *
X*                                                                          *
X***************************************************************************/
X
X#include "config.h"
X
X/*
X** system includes <>
X*/
X
X#include <stdio.h>
X#ifndef NO_STR_INC
X#ifdef STRING_PLURAL
X#include <strings.h>
X#else
X#include <string.h>
X#endif
X#endif
X
X
X/*
X** custom includes ""
X*/
X
X#include "depend.h"
X#include "formats.h"
X#include "pcx.h"
X
X
X/*
X** local #defines
X*/
X
X/*
X** misc: copyright strings, version macros, etc.
X*/
X
X/*
X** typedefs
X*/
X
X/*
X** global variables
X*/
X
X/*
X** static globals
X*/
X
Xstatic char CONST rcsid[] = "$Id: pcx.c,v 1.1 1993/03/02 00:57:05 jwbirdsa Exp $";
X
X
X/*
X** function prototypes
X*/
X
X#ifdef NO_STR_INC
Xextern char *strrchr();
Xextern int strcmp();
X#endif
X
X
X/*
X** functions
X*/
X
X
X/***************************************************************************
X*   FUNCTION:    pcx_verify                                                *
X*                                                                          *
X*   DESCRIPTION:                                                           *
X*                                                                          *
X*       Verifies that a file is an PCX file by checking filename against   *
X*       list of extensions. Reads PCX version number from start of file.   *
X*                                                                          *
X*   ENTRY:                                                                 *
X*                                                                          *
X*       filename - name of file to be verified                             *
X*       version  - pointer to unsigned long in which format/version value  *
X*                  is returned                                             *
X*       exts     - array of string pointers, list of extensions for PCX    *
X*                  files                                                   *
X*                                                                          *
X*   EXIT:                                                                  *
X*                                                                          *
X*       Returns an error/status code.                                      *
X*                                                                          *
X*   CONSTRAINTS/SIDE EFFECTS:                                              *
X*                                                                          *
X***************************************************************************/
XULONG
X#ifdef __STDC__
Xpcx_verify(char *filename, ULONG *version, char **exts)
X#else
Xpcx_verify(filename, version, exts)
Xchar *filename;
XULONG *version;
Xchar **exts;
X#endif
X{
X    char *extptr;
X    int loop;
X    FILE *pcxfile;
X    int magic;
X    ULONG retval;
X
X    /* Search for '.' marking extension. */
X
X    extptr = strrchr(filename, '.');
X    if (NULL == extptr)
X    {
X        /* No extension, cannot classify. */
X
X        *version = PCX_NOT;
X        return 0;
X    }
X    extptr++;
X
X    /* Now we have the extension, check against list. */
X
X    for (loop = 0; exts[loop] != NULL; loop++)
X    {
X        /* Case-sensitive string compare. */
X
X        if (strcmp(extptr, exts[loop]) == 0)
X        {
X            /* Match, so break out of loop. */
X
X            break;
X        }
X    }
X
X    /* Check exit from loop. */
X
X    if (NULL == exts[loop])
X    {
X        /* No match, return. */
X
X        *version = PCX_NOT;
X        return 0;
X    }
X
X    /* Extension is valid for type PCX, so process accordingly. */
X
X    if ((pcxfile = fopen(filename, FOPEN_READ_BINARY)) == (FILE *) NULL)
X    {
X        return PCX_FILEERR_E;
X    }
X
X    /* Read magic number. */
X
X    if ((magic = fgetc(pcxfile)) == EOF)
X    {
X        *version = PCX_NOT;
X        retval = (feof(pcxfile) ? ST_SUCCESS : PCX_FILEERR_E);
X        fclose(pcxfile);
X        return retval;
X    }
X    if (PCX_MAGIC != magic)
X    {
X        *version = PCX_NOT;
X        fclose(pcxfile);
X        return ST_SUCCESS;
X    }
X
X    /* Read version number, which immediately follows. */
X
X    if ((magic = fgetc(pcxfile)) == EOF)
X    {
X        *version = PCX_NOT;
X        retval = (feof(pcxfile) ? ST_SUCCESS : PCX_FILEERR_E);
X        fclose(pcxfile);
X        return retval;
X    }
X
X    /* Close file. */
X
X    if (fclose(pcxfile))
X    {
X        return PCX_FILEERR_E;
X    }
X
X    /* Set version according to magic. */
X
X    switch (magic)
X    {
X        case PCX_VER25_MAGIC:
X            *version = PCX_VER25;
X            break;
X
X        case PCX_VER28_MAGIC:
X            *version = PCX_VER28;
X            break;
X
X        case PCX_VER28P_MAGIC:
X            *version = PCX_VER28P;
X            break;
X
X        case PCX_VER30_MAGIC:
X            *version = PCX_VER30;
X            break;
X
X        default:
X            *version = PCX_NOT;
X            break;
X    }
X
X    /* Return OK. */
X
X    return ST_SUCCESS;
X} /* end of pcx_verify() */
X
X
X/***************************************************************************
X*   FUNCTION:    pcx_getheader                                             *
X*                                                                          *
X*   DESCRIPTION:                                                           *
X*                                                                          *
X*       Assumes that file is an PCX file. Reads header from file, extracts *
X*       data into PCX_HDR structure.                                       *
X*                                                                          *
X*   ENTRY:                                                                 *
X*                                                                          *
X*       infile  - file to be processed                                     *
X*       results - pointer to PCX_HDR structure in which data from header   *
X*                 is returned                                              *
X*                                                                          *
X*   EXIT:                                                                  *
X*                                                                          *
X*       Returns an error/status code.                                      *
X*                                                                          *
X*   CONSTRAINTS/SIDE EFFECTS:                                              *
X*                                                                          *
X*       Leaves file pointing to beginning of image data.                   *
X*                                                                          *
X***************************************************************************/
XULONG
X#ifdef __STDC__
Xpcx_getheader(FILE *infile, PCX_HDR *results)
X#else
Xpcx_getheader(infile, results)
XFILE *infile;
XPCX_HDR *results;
X#endif
X{
X    UCHAR rawhdr[PCX_HDR_LEN];
X
X    /* Make sure we're at beginning of file. */
X
X    if (fseek(infile, 0L, SEEK_SET))
X    {
X        return PCX_FILEERR_E;
X    }
X
X    /* Read raw bytes into buffer. */
X
X    if (fread(rawhdr, 1, PCX_HDR_LEN, infile) != PCX_HDR_LEN)
X    {
X        return (feof(infile) ? PCX_UNEOF_E : PCX_FILEERR_E);
X    }
X
X    /* Extract info from raw header. */
X
X    if (PCX_MAGIC != *(rawhdr + PCX_HDR_MAGIC_OFF))
X    {
X        return PCX_NOTPCX_E;
X    }
X    switch (*(rawhdr + PCX_HDR_VERS_OFF))
X    {
X        case PCX_VER25_MAGIC:
X            results->version = PCX_VER25;
X            break;
X
X        case PCX_VER28_MAGIC:
X            results->version = PCX_VER28;
X            break;
X
X        case PCX_VER28P_MAGIC:
X            results->version = PCX_VER28P;
X            break;
X
X        case PCX_VER30_MAGIC:
X            results->version = PCX_VER30;
X            break;
X
X        default:
X            return PCX_NOTPCX_E;
X            break;
X    }
X    results->planes = (unsigned int)(*(rawhdr + PCX_HDR_PLANES_OFF));
X    results->pixbits = (unsigned int)(*(rawhdr + PCX_HDR_BITS_OFF));
X    results->imwid = CONSTRUCT_I_UINT(rawhdr + PCX_HDR_XMAX_OFF);
X    results->imhi = CONSTRUCT_I_UINT(rawhdr + PCX_HDR_YMAX_OFF);
X    results->imleft = CONSTRUCT_I_UINT(rawhdr + PCX_HDR_XMIN_OFF);
X    results->imtop = CONSTRUCT_I_UINT(rawhdr + PCX_HDR_YMIN_OFF);
X    results->imwid -= (results->imleft - 1);
X    results->imhi -= (results->imtop - 1);
X    results->encoding = (unsigned int)(*(rawhdr + PCX_HDR_ENC_OFF));
X    results->hres = CONSTRUCT_I_UINT(rawhdr + PCX_HDR_HRES_OFF);
X    results->vres = CONSTRUCT_I_UINT(rawhdr + PCX_HDR_VRES_OFF);
X    results->palfmt = CONSTRUCT_I_UINT(rawhdr + PCX_HDR_PFMT_OFF);
X
X    /* Set file to point to start of data. */
X
X    if (fseek(infile, (long)(PCX_HDR_MAXLEN), SEEK_SET))
X    {
X        return PCX_FILEERR_E;
X    }
X
X    /* Return OK. */
X
X    return 0;
X} /* end of pcx_getheader() */
X
X
X/***************************************************************************
X*   FUNCTION: pcx_errstring                                                *
X*                                                                          *
X*   DESCRIPTION:                                                           *
X*                                                                          *
X*      Returns a string corresponding to an error code.                    *
X*                                                                          *
X*   ENTRY:                                                                 *
X*                                                                          *
X*      errcode - error code to be translated                               *
X*                                                                          *
X*   EXIT:                                                                  *
X*                                                                          *
X*      Returns a pointer to the appropriate string, or NULL if there is    *
X*      no appropriate string.                                              *
X*                                                                          *
X*   CONSTRAINTS/SIDE EFFECTS:                                              *
X*                                                                          *
X***************************************************************************/
Xchar *
X#ifdef __STDC__
Xpcx_errstring(ULONG errcode)
X#else
Xpcx_errstring(errcode)
XULONG errcode;
X#endif
X{
X    char *temp;
X
X    /* If error code not from this module, return NULL. */
X
X    if ((errcode & ST_MOD_MASK) != PCX_MODULE)
X    {
X        return NULL;
X    }
X
X    /* Process by code. */
X
X    switch (ERRSEV(errcode))
X    {
X        case ERRSEV(PCX_NOTPCX_E):
X            temp = "File is not a PCX format file.";
X            break;
X        case ERRSEV(PCX_FILEERR_E):
X            temp = "Error accessing file.";
X            break;
X        case ERRSEV(PCX_UNEOF_E):
X            temp = "Unexpected End of File";
X            break;
X
X        default:
X            temp = NULL;
X            break;
X    }
X
X    return temp;
X} /* end of pcx_errstring() */
X
END_OF_FILE
  if test 12105 -ne `wc -c <'src/pcx.c'`; then
    echo shar: \"'src/pcx.c'\" unpacked with wrong size!
  fi
  # end of 'src/pcx.c'
fi
echo shar: End of archive 13 \(of 18\).
cp /dev/null ark13isdone
MISSING=""
for I in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked all 18 archives.
    rm -f ark[1-9]isdone ark[1-9][0-9]isdone
else
    echo You still must unpack the following archives:
    echo "        " ${MISSING}
fi
exit 0
exit 0 # Just in case...