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/*
pspresent: PostScript presentation tool
ps.c: Parsing of PostScript Document Structuring Convention
Copyright (C) Matthew Chapman 2001-2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pspresent.h"
#include <assert.h>
#define DSC_END_COMMENTS "%%EndComments"
#define DSC_BOUNDING_BOX "%%BoundingBox: "
#define DSC_ORIENTATION "%%Orientation: "
#define DSC_PAGES "%%Pages: "
#define DSC_PAGE "%%Page: "
#define DSC_BEGIN_DOCUMENT "%%BeginDocument"
#define DSC_END_DOCUMENT "%%EndDocument"
#define DSC_TRAILER "%%Trailer"
#define LEN(str) (sizeof(str)-1)
static char *PSGetLine(char **p, char *end)
{
char *next = *p;
if (next != NULL)
{
*p = memchr(next, '\n', end-next);
if (*p != NULL)
(*p)++;
}
return next;
}
static Bool PSGetBoundingBox(char *string, int bounds[4])
{
char *p;
bounds[0] = strtol(string, &p, 10);
if (*p != ' ')
return False;
bounds[1] = strtol(p+1, &p, 10);
if (*p != ' ')
return False;
bounds[2] = strtol(p+1, &p, 10);
if (*p != ' ')
return False;
bounds[3] = strtol(p+1, &p, 10);
if ((*p != '\n') && (*p != 0))
return False;
return True;
}
Bool PSGetOrientation(char *string, int *orientation)
{
if (!strncmp(string, "Portrait", 8))
*orientation = Portrait;
else if (!strncmp(string, "Landscape", 9))
*orientation = Landscape;
else if (!strncmp(string, "Upside-Down", 11))
*orientation = UpsideDown;
else if (!strncmp(string, "Seascape", 8))
*orientation = Seascape;
else
return False;
return True;
}
Bool PSScanDocument(char *start, char *end, int bounds[4], int *orientation,
int *num_pages, struct pspage **ret_pages,
int *num_real_pages, int **ret_real_pages)
{
char *line;
Bool gotBB = False, gotOR = False;
int pages_size = 0, page = 0, real_page = 0;
int eps_level = 0, this_page, last_page = 0;
struct pspage *pages;
int *real_pages;
if ((start[0] != '%') || (start[1] != '!'))
{
fprintf(stderr, "ERROR: Not a PostScript file\n");
return False;
}
while ((line = PSGetLine(&start, end)) != NULL)
{
if ((line[0] != '%')
|| !strncmp(line, DSC_END_COMMENTS, LEN(DSC_END_COMMENTS)))
{
break;
}
else if (!strncmp(line, DSC_BOUNDING_BOX, LEN(DSC_BOUNDING_BOX)))
{
gotBB = PSGetBoundingBox(line + LEN(DSC_BOUNDING_BOX), bounds);
}
else if (!strncmp(line, DSC_ORIENTATION, LEN(DSC_ORIENTATION)))
{
gotOR = PSGetOrientation(line + LEN(DSC_ORIENTATION), orientation);
}
else if (!strncmp(line, DSC_PAGES, LEN(DSC_PAGES)))
{
pages_size = atoi(line + LEN(DSC_PAGES)) + 1;
}
}
if (!gotBB)
{
fprintf(stderr, "ERROR: No bounding box information found\n");
return False;
}
if (!gotOR)
*orientation = Portrait;
if (pages_size == 0)
pages_size = 100;
pages = malloc(pages_size * sizeof(struct pspage));
real_pages = malloc(pages_size * sizeof(int));
while ((line = PSGetLine(&start, end)) != NULL)
{
if (line[0] != '%')
{
}
else if (!strncmp(line, DSC_BEGIN_DOCUMENT, LEN(DSC_BEGIN_DOCUMENT)))
{
eps_level++;
}
else if (!strncmp(line, DSC_END_DOCUMENT, LEN(DSC_END_DOCUMENT)))
{
eps_level--;
}
else if (!strncmp(line, DSC_PAGE, LEN(DSC_PAGE)) && (eps_level == 0))
{
this_page = atoi(line + LEN(DSC_PAGE));
if ((page != 0) && (this_page != last_page))
{
pages[page-1].is_last = 1;
real_pages[real_page++] = page-1;
}
last_page = this_page;
pages[page].data = line;
pages[page].is_last = 0;
if (++page == pages_size)
{
pages_size += 100;
pages = realloc(pages, pages_size * sizeof(struct pspage));
real_pages = realloc(real_pages, pages_size * sizeof(int));
}
}
else if (!strncmp(line, DSC_TRAILER, LEN(DSC_TRAILER)) &&
(eps_level == 0))
{
if (page != 0)
{
pages[page-1].is_last = 1;
real_pages[real_page++] = page-1;
}
pages[page].data = line;
pages[page].is_last = 0;
break;
}
}
if (page == 0)
{
fprintf(stderr, "ERROR: Document does not follow PostScript structuring convention\n");
free(pages);
free(real_pages);
return False;
}
*num_pages = page;
*ret_pages = pages;
*num_real_pages = real_page;
*ret_real_pages = real_pages;
return True;
}
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