static int get_bytes(DviContext *dvi, size_t n)
{
/*
* caller wants to read `n' bytes from dvi->buffer + dvi->pos.
* Make sure there is enough data to satisfy the request
*/
if(NEEDBYTES(dvi, n)) {
size_t required;
int newlen;
if(dvi->buffer.frozen || dvi->in == NULL || feof(dvi->in)) {
/* this is EOF */
dviwarn(dvi, _("unexpected EOF\n"));
return -1;
}
/* get more data */
if(dvi->buffer.data == NULL) {
/* first allocation */
dvi->buffer.size = Max(DVI_BUFLEN, n);
dvi->buffer.data = (Uchar *)mdvi_malloc(dvi->buffer.size);
dvi->buffer.length = 0;
dvi->buffer.frozen = 0;
} else if(dvi->buffer.pos < dvi->buffer.length) {
/* move whatever we want to keep */
dvi->buffer.length -= dvi->buffer.pos;
memmove(dvi->buffer.data,
dvi->buffer.data + dvi->buffer.pos,
dvi->buffer.length);
} else {
/* we can discard all the data in this buffer */
dvi->buffer.length = 0;
}
required = n - dvi->buffer.length;
if(required > dvi->buffer.size - dvi->buffer.length) {
/* need to allocate more memory */
dvi->buffer.size = dvi->buffer.length + required + 128;
dvi->buffer.data = (Uchar *)xresize(dvi->buffer.data,
char, dvi->buffer.size);
}
/* now read into the buffer */
newlen = fread(dvi->buffer.data + dvi->buffer.length,
1, dvi->buffer.size - dvi->buffer.length, dvi->in);
if(newlen == -1) {
mdvi_error("%s: %s\n", dvi->filename, strerror(errno));
return -1;
}
dvi->buffer.length += newlen;
dvi->buffer.pos = 0;
}
char *read_string(FILE *in, int s, char *buffer, size_t len)
{
int n;
char *str;
n = fugetn(in, s ? s : 1);
if((str = buffer) == NULL || n + 1 > len)
str = mdvi_malloc(n + 1);
if(fread(str, 1, n, in) != n) {
if(str != buffer) mdvi_free(str);
return NULL;
}
str[n] = 0;
return str;
}
BITMAP *bitmap_alloc_raw(int w, int h)
{
BITMAP *bm;
bm = xalloc(BITMAP);
bm->width = w;
bm->height = h;
bm->stride = BM_BYTES_PER_LINE(bm);
if(h && bm->stride)
bm->data = (BmUnit *)mdvi_malloc(h * bm->stride);
else
bm->data = NULL;
return bm;
}
char *buff_gets(Buffer *buf, size_t *length)
{
char *ptr;
char *ret;
size_t len;
ptr = strchr(buf->data, '\n');
if(ptr == NULL)
return NULL;
ptr++; /* include newline */
len = ptr - buf->data;
ret = mdvi_malloc(len + 1);
if(len > 0) {
memcpy(ret, buf->data, len);
memmove(buf->data, buf->data + len, buf->length - len);
buf->length -= len;
}
ret[len] = 0;
if(length) *length = len;
return ret;
}
void epsf_special(DviContext *dvi, char *prefix, char *arg)
{
char *file;
char *special;
char *psfile;
char *tmp;
EpsfBox box = {0, 0, 0, 0};
int x, y;
int w, h;
double xf, vf;
struct stat buf;
file = parse_epsf_special(&box, &special, prefix, arg);
if (file != NULL)
mdvi_free (special);
xf = dvi->params.dpi * dvi->params.mag / (72.0 * dvi->params.hshrink);
vf = dvi->params.vdpi * dvi->params.mag / (72.0 * dvi->params.vshrink);
w = FROUND(box.bw * xf);
h = FROUND(box.bh * vf);
x = FROUND(box.ox * xf) + dvi->pos.hh;
y = FROUND(box.oy * vf) + dvi->pos.vv - h + 1;
if (!file || !dvi->device.draw_ps) {
dvi->device.draw_rule (dvi, x, y, w, h, 0);
return;
}
if (file[0] == '/') { /* Absolute path */
if (stat (file, &buf) == 0)
dvi->device.draw_ps (dvi, file, x, y, w, h);
else
dvi->device.draw_rule (dvi, x, y, w, h, 0);
return;
}
tmp = mdvi_strrstr (dvi->filename, "/");
if (tmp) { /* Document directory */
int path_len = strlen (dvi->filename) - strlen (tmp + 1);
int file_len = strlen (file);
psfile = mdvi_malloc (path_len + file_len + 1);
psfile[0] = '\0';
strncat (psfile, dvi->filename, path_len);
strncat (psfile, file, file_len);
if (stat (psfile, &buf) == 0) {
dvi->device.draw_ps (dvi, psfile, x, y, w, h);
mdvi_free (psfile);
return;
}
mdvi_free (psfile);
}
psfile = mdvi_build_path_from_cwd (file);
if (stat (psfile, &buf) == 0) { /* Current working dir */
dvi->device.draw_ps (dvi, psfile, x, y, w, h);
mdvi_free (psfile);
return;
}
mdvi_free (psfile);
psfile = kpse_find_pict (file);
if (psfile) { /* kpse */
dvi->device.draw_ps (dvi, psfile, x, y, w, h);
} else {
dvi->device.draw_rule(dvi, x, y, w, h, 0);
}
free (psfile);
}