psusershape.c

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/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#include <sys/stat.h>
#include <common/render.h>
#include <gvc/gvio.h>
#include <stdatomic.h>
#include <stdbool.h>
#include <stdio.h>
#include <util/alloc.h>
#include <util/gv_fopen.h>
#include <util/strcasecmp.h>
 
static int N_EPSF_files;
static Dict_t *EPSF_contents;
 
static void ps_image_free(void *shape) {
    usershape_t *p = shape;
    free(p->data);
}
 
static Dtdisc_t ImageDictDisc = {
    .key = offsetof(usershape_t, name),
    .size = -1,
    .freef = ps_image_free,
};
 
static usershape_t *user_init(const char *str)
{
    char line[BUFSIZ];
    FILE *fp;
    struct stat statbuf;
    int lx, ly, ux, uy;
 
    if (!EPSF_contents)
        EPSF_contents = dtopen(&ImageDictDisc, Dtoset);
 
    usershape_t *us = dtmatch(EPSF_contents, str);
    if (us)
        return us;
 
    if (!(fp = gv_fopen(str, "r"))) {
        agwarningf("couldn't open epsf file %s\n", str);
        return NULL;
    }
    /* try to find size */
    bool saw_bb = false;
    bool must_inline = false;
    while (fgets(line, sizeof(line), fp)) {
        if (sscanf
            (line, "%%%%BoundingBox: %d %d %d %d", &lx, &ly, &ux, &uy) == 4) {
            saw_bb = true;
        }
        if (line[0] != '%' && strstr(line,"read")) must_inline = true;
        if (saw_bb && must_inline) break;
    }
 
    if (saw_bb) {
        us = gv_alloc(sizeof(usershape_t));
        us->x = lx;
        us->y = ly;
        us->w = ux - lx;
        us->h = uy - ly;
        us->name = str;
        us->macro_id = N_EPSF_files++;
        fstat(fileno(fp), &statbuf);
        char *contents = us->data = gv_calloc((size_t)statbuf.st_size + 1, sizeof(char));
        rewind(fp);
        size_t rc = fread(contents, (size_t)statbuf.st_size, 1, fp);
        if (rc == 1) {
            contents[statbuf.st_size] = '\0';
            dtinsert(EPSF_contents, us);
            us->must_inline = must_inline;
        }
        else {
            agwarningf("couldn't read from epsf file %s\n", str);
            free(us->data);
            free(us);
            us = NULL;
        }
    } else {
        agwarningf("BoundingBox not found in epsf file %s\n", str);
        us = NULL;
    }
    fclose(fp);
    return us;
}
 
void epsf_init(node_t * n)
{
    epsf_t *desc;
    const char *str;
 
    if ((str = safefile(agget(n, "shapefile")))) {
        usershape_t *us = user_init(str);
        if (!us)
            return;
        const double dx = us->w;
        const double dy = us->h;
        ND_width(n) = PS2INCH(dx);
        ND_height(n) = PS2INCH(dy);
        ND_shape_info(n) = desc = gv_alloc(sizeof(epsf_t));
        desc->macro_id = us->macro_id;
        desc->offset.x = -us->x - dx / 2;
        desc->offset.y = -us->y - dy / 2;
    } else
        agwarningf("shapefile not set or not found for epsf node %s\n", agnameof(n));
}
 
void epsf_free(node_t * n)
{
 
    free(ND_shape_info(n));
}
 
 
/* cat_libfile:
 * Write library files onto the given file pointer.
 * arglib is an NULL-terminated array of char*
 * Each non-trivial entry should be the name of a file to be included.
 * stdlib is an NULL-terminated array of char*
 * Each of these is a line of a standard library to be included.
 * If any item in arglib is the empty string, the stdlib is not used.
 * The stdlib is printed first, if used, followed by the user libraries.
 * We check that for web-safe file usage.
 */
void cat_libfile(GVJ_t * job, const char **arglib, const char **stdlib)
{
    FILE *fp;
    const char *p;
    bool use_stdlib = true;
 
    /* check for empty string to turn off stdlib */
    if (arglib) {
        for (int i = 0; use_stdlib && (p = arglib[i]); i++) {
            if (*p == '\0')
                use_stdlib = false;
        }
    }
    if (use_stdlib)
        for (const char **s = stdlib; *s; s++) {
            gvputs(job, *s);
            gvputs(job, "\n");
        }
    if (arglib) {
        for (int i = 0; (p = arglib[i]) != 0; i++) {
            if (*p == '\0')
                continue;       /* ignore empty string */
            const char *safepath = safefile(p);    /* make sure filename is okay */
            if (!safepath) {
                agwarningf("can't find library file %s\n", p);
            }
            else if ((fp = gv_fopen(safepath, "r"))) {
                while (true) {
                    char bp[BUFSIZ] = {0};
                    size_t r = fread(bp, 1, sizeof(bp), fp);
                    gvwrite(job, bp, r);
                    if (r < sizeof(bp)) {
                      break;
                    }
                }
                gvputs(job, "\n"); /* append a newline just in case */
                fclose (fp);
            } else
                agwarningf("can't open library file %s\n", safepath);
        }
    }
}
 
/* this removes EPSF DSC comments that, when nested in another
 * document, cause errors in Ghostview and other Postscript
 * processors (although legal according to the Adobe EPSF spec).
 *
 * N.B. PostScript lines can end with \n, \r or \r\n.
 */
void epsf_emit_body(GVJ_t *job, usershape_t *us)
{
    char *p = us->data;
    while (*p) {
        /* skip %%EOF lines */
        if (!strncasecmp(p, "%%EOF", 5) || !strncasecmp(p, "%%BEGIN", 7) ||
            !strncasecmp(p, "%%END", 5) || !strncasecmp(p, "%%TRAILER", 9)) {
            /* check for *p since last line might not end in '\n' */
            while (*p != '\0' && *p != '\r' && *p != '\n') p++;
            if (*p == '\r' && p[1] == '\n') p += 2;
            else if (*p) p++;
            continue;
        }
        /* output line */
        while (*p != '\0' && *p != '\r' && *p != '\n') {
            gvputc(job, *p);
            p++;
        }
        if (*p == '\r' && p[1] == '\n') p += 2;
        else if (*p) p++;
        gvputc(job, '\n');
    }
}
 
void epsf_define(GVJ_t *job)
{
    if (!EPSF_contents)
        return;
    for (usershape_t *us = dtfirst(EPSF_contents); us; us = dtnext(EPSF_contents, us)) {
        if (us->must_inline)
            continue;
        gvprintf(job, "/user_shape_%d {\n", us->macro_id);
        gvputs(job, "%%BeginDocument:\n");
        epsf_emit_body(job, us);
        gvputs(job, "%%EndDocument\n");
        gvputs(job, "} bind def\n");
    }
}
 
enum {ASCII, LATIN1, NONLATIN};
 
/* charsetOf:
 * Assuming legal utf-8 input, determine if
 * the character value range is ascii, latin-1 or otherwise.
 */
static int
charsetOf (char* s)
{
    int r = ASCII;
    unsigned char c;
 
    while ((c = *(unsigned char*)s++)) {
        if (c < 0x7F) 
            continue;
        else if ((c & 0xFC) == 0xC0) {
            r = LATIN1;
            s++; /* eat second byte */
        }
        else return NONLATIN;
    }
    return r;
}
 
/* ps_string:
 * internally, strings are always utf8. If chset is CHAR_LATIN1, we know
 * all of the values can be represented by latin-1; if chset is
 * CHAR_UTF8, we use the string as is; otherwise, we test to see if the
 * string is ascii, latin-1 or non-latin, and translate to latin-l if
 * possible.
 */
char *ps_string(char *ins, int chset)
{
    char *base;
    static agxbuf  xb;
    static atomic_flag warned;
 
    switch (chset) {
    case CHAR_UTF8 :
        base = ins;
        break;
    case CHAR_LATIN1 :
        base = utf8ToLatin1 (ins);
        break;
    default :
        switch (charsetOf (ins)) {
        case ASCII :
            base = ins;
            break;
        case LATIN1 :
            base = utf8ToLatin1 (ins);
            break;
        case NONLATIN :
            if (!atomic_flag_test_and_set(&warned)) {
                agwarningf("UTF-8 input uses non-Latin1 characters which cannot be handled by this PostScript driver\n");
            }
            base = ins;
            break;
        default:
            base = ins;
            break;
        }
    }
 
    agxbputc (&xb, LPAREN);
    char *s = base;
    while (*s) {
        if (*s == LPAREN || *s == RPAREN || *s == '\\')
            agxbputc (&xb, '\\');
        agxbputc (&xb, *s++);
    }
    agxbputc (&xb, RPAREN);
    if (base != ins) free (base);
    s = agxbuse(&xb);
    return s;
}