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gimp/app/file-utils.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995, 1996, 1997 Spencer Kimball and Peter Mattis
* Copyright (C) 1997 Josh MacDonald
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <gtk/gtk.h>
#ifdef G_OS_WIN32
#include <direct.h> /* For _mkdir() */
#define mkdir(path,mode) _mkdir(path)
#endif
#include "libgimpmath/gimpmath.h"
#include "apptypes.h"
#include "file-utils.h"
#include "gimpimage.h"
#include "plug_in.h"
#include "temp_buf.h"
static PlugInProcDef *
file_proc_find_by_name (GSList *procs,
const gchar *filename,
gboolean skip_magic)
{
GSList *p;
gchar *ext = strrchr (filename, '.');
if (ext)
ext++;
for (p = procs; p; p = g_slist_next (p))
{
PlugInProcDef *proc = p->data;
GSList *prefixes;
if (skip_magic && proc->magics_list)
continue;
for (prefixes = proc->prefixes_list;
prefixes;
prefixes = g_slist_next (prefixes))
{
if (strncmp (filename, prefixes->data, strlen (prefixes->data)) == 0)
return proc;
}
}
for (p = procs; p; p = g_slist_next (p))
{
PlugInProcDef *proc = p->data;
GSList *extensions;
for (extensions = proc->extensions_list;
ext && extensions;
extensions = g_slist_next (extensions))
{
gchar *p1 = ext;
gchar *p2 = (gchar *) extensions->data;
if (skip_magic && proc->magics_list)
continue;
while (*p1 && *p2)
{
if (tolower (*p1) != tolower (*p2))
break;
p1++;
p2++;
}
if (!(*p1) && !(*p2))
return proc;
}
}
return NULL;
}
PlugInProcDef *
file_proc_find (GSList *procs,
const gchar *filename)
{
PlugInProcDef *file_proc;
PlugInProcDef *size_matched_proc = NULL;
GSList *all_procs = procs;
FILE *ifp = NULL;
gint head_size = -2;
gint size_match_count = 0;
gint match_val;
guchar head[256];
/* First, check magicless prefixes/suffixes */
if ( (file_proc = file_proc_find_by_name (all_procs, filename, TRUE)) != NULL)
return file_proc;
/* Then look for magics */
while (procs)
{
file_proc = procs->data;
procs = procs->next;
if (file_proc->magics_list)
{
if (head_size == -2)
{
head_size = 0;
if ((ifp = fopen (filename, "rb")) != NULL)
head_size = fread ((gchar *) head, 1, sizeof (head), ifp);
}
if (head_size >= 4)
{
match_val = file_check_magic_list (file_proc->magics_list,
head_size, head, ifp);
if (match_val == 2) /* size match ? */
{ /* Use it only if no other magic matches */
size_match_count++;
size_matched_proc = file_proc;
}
else if (match_val)
{
fclose (ifp);
return (file_proc);
}
}
}
}
if (ifp) fclose (ifp);
if (size_match_count == 1)
return (size_matched_proc);
/* As a last ditch, try matching by name */
return file_proc_find_by_name (all_procs, filename, FALSE);
}
static void
file_convert_string (gchar *instr,
gchar *outmem,
gint maxmem,
gint *nmem)
{
/* Convert a string in C-notation to array of char */
guchar *uin = (guchar *) instr;
guchar *uout = (guchar *) outmem;
guchar tmp[5], *tmpptr;
gint k;
while ((*uin != '\0') && ((((char *)uout) - outmem) < maxmem))
{
if (*uin != '\\') /* Not an escaped character ? */
{
*(uout++) = *(uin++);
continue;
}
if (*(++uin) == '\0')
{
*(uout++) = '\\';
break;
}
switch (*uin)
{
case '0': case '1': case '2': case '3': /* octal */
for (tmpptr = tmp; (tmpptr-tmp) <= 3;)
{
*(tmpptr++) = *(uin++);
if ( (*uin == '\0') || (!isdigit (*uin))
|| (*uin == '8') || (*uin == '9'))
break;
}
*tmpptr = '\0';
sscanf ((char *)tmp, "%o", &k);
*(uout++) = k;
break;
case 'a': *(uout++) = '\a'; uin++; break;
case 'b': *(uout++) = '\b'; uin++; break;
case 't': *(uout++) = '\t'; uin++; break;
case 'n': *(uout++) = '\n'; uin++; break;
case 'v': *(uout++) = '\v'; uin++; break;
case 'f': *(uout++) = '\f'; uin++; break;
case 'r': *(uout++) = '\r'; uin++; break;
default : *(uout++) = *(uin++); break;
}
}
*nmem = ((gchar *) uout) - outmem;
}
static gint
file_check_single_magic (gchar *offset,
gchar *type,
gchar *value,
gint headsize,
guchar *file_head,
FILE *ifp)
{
/* Return values are 0: no match, 1: magic match, 2: size match */
glong offs;
gulong num_testval, num_operatorval;
gulong fileval;
gint numbytes, k, c = 0, found = 0;
gchar *num_operator_ptr, num_operator, num_test;
guchar mem_testval[256];
/* Check offset */
if (sscanf (offset, "%ld", &offs) != 1) return (0);
if (offs < 0) return (0);
/* Check type of test */
num_operator_ptr = NULL;
num_operator = '\0';
num_test = '=';
if (strncmp (type, "byte", 4) == 0)
{
numbytes = 1;
num_operator_ptr = type+4;
}
else if (strncmp (type, "short", 5) == 0)
{
numbytes = 2;
num_operator_ptr = type+5;
}
else if (strncmp (type, "long", 4) == 0)
{
numbytes = 4;
num_operator_ptr = type+4;
}
else if (strncmp (type, "size", 4) == 0)
{
numbytes = 5;
}
else if (strcmp (type, "string") == 0)
{
numbytes = 0;
}
else return (0);
/* Check numerical operator value if present */
if (num_operator_ptr && (*num_operator_ptr == '&'))
{
if (isdigit (num_operator_ptr[1]))
{
if (num_operator_ptr[1] != '0') /* decimal */
sscanf (num_operator_ptr+1, "%ld", &num_operatorval);
else if (num_operator_ptr[2] == 'x') /* hexadecimal */
sscanf (num_operator_ptr+3, "%lx", &num_operatorval);
else /* octal */
sscanf (num_operator_ptr+2, "%lo", &num_operatorval);
num_operator = *num_operator_ptr;
}
}
if (numbytes > 0) /* Numerical test ? */
{
/* Check test value */
if ((value[0] == '=') || (value[0] == '>') || (value[0] == '<'))
{
num_test = value[0];
value++;
}
if (!isdigit (value[0])) return (0);
/*
* to anybody reading this: is strtol's parsing behaviour (e.g. "0x" prefix)
* broken on some systems or why do we do the base detection ourselves?
* */
if (value[0] != '0') /* decimal */
num_testval = strtol(value, NULL, 10);
else if (value[1] == 'x') /* hexadecimal */
num_testval = (unsigned long)strtoul(value+2, NULL, 16);
else /* octal */
num_testval = strtol(value+1, NULL, 8);
fileval = 0;
if (numbytes == 5) /* Check for file size ? */
{
struct stat buf;
if (fstat (fileno (ifp), &buf) < 0) return (0);
fileval = buf.st_size;
}
else if (offs + numbytes <= headsize) /* We have it in memory ? */
{
for (k = 0; k < numbytes; k++)
fileval = (fileval << 8) | (long)file_head[offs+k];
}
else /* Read it from file */
{
if (fseek (ifp, offs, SEEK_SET) < 0) return (0);
for (k = 0; k < numbytes; k++)
fileval = (fileval << 8) | (c = getc (ifp));
if (c == EOF) return (0);
}
if (num_operator == '&')
fileval &= num_operatorval;
if (num_test == '<')
found = (fileval < num_testval);
else if (num_test == '>')
found = (fileval > num_testval);
else
found = (fileval == num_testval);
if (found && (numbytes == 5)) found = 2;
}
else if (numbytes == 0) /* String test */
{
file_convert_string ((char *)value, (char *)mem_testval,
sizeof (mem_testval), &numbytes);
if (numbytes <= 0) return (0);
if (offs + numbytes <= headsize) /* We have it in memory ? */
{
found = (memcmp (mem_testval, file_head+offs, numbytes) == 0);
}
else /* Read it from file */
{
if (fseek (ifp, offs, SEEK_SET) < 0) return (0);
found = 1;
for (k = 0; found && (k < numbytes); k++)
{
c = getc (ifp);
found = (c != EOF) && (c == (int)mem_testval[k]);
}
}
}
return found;
}
gint
file_check_magic_list (GSList *magics_list,
gint headsize,
guchar *head,
FILE *ifp)
{
/* Return values are 0: no match, 1: magic match, 2: size match */
gchar *offset;
gchar *type;
gchar *value;
gint and = 0;
gint found = 0;
gint match_val;
while (magics_list)
{
if ((offset = (gchar *)magics_list->data) == NULL) break;
if ((magics_list = magics_list->next) == NULL) break;
if ((type = (gchar *)magics_list->data) == NULL) break;
if ((magics_list = magics_list->next) == NULL) break;
if ((value = (gchar *)magics_list->data) == NULL) break;
magics_list = magics_list->next;
match_val = file_check_single_magic (offset, type, value,
headsize, head, ifp);
if (and)
found = found && match_val;
else
found = match_val;
and = (strchr (offset, '&') != NULL);
if ((!and) && found)
return match_val;
}
return 0;
}
TempBuf *
make_thumb_tempbuf (GimpImage *gimage)
{
gint w, h;
if (gimage->width<=80 && gimage->height<=60)
{
w = gimage->width;
h = gimage->height;
}
else
{
/* Ratio molesting to fit within .xvpic thumbnail size limits */
if (60 * gimage->width < 80 * gimage->height)
{
h = 60;
w = (60 * gimage->width) / gimage->height;
if (w == 0)
w = 1;
}
else
{
w = 80;
h = (80 * gimage->height) / gimage->width;
if (h == 0)
h = 1;
}
}
/*printf("tn: %d x %d -> ", w, h);fflush(stdout);*/
return gimp_viewable_get_preview (GIMP_VIEWABLE (gimage), w, h);
}
/* The readXVThumb function source may be re-used under
the XFree86-style license. <adam@gimp.org> */
guchar *
readXVThumb (const gchar *fnam,
gint *w,
gint *h,
gchar **imginfo /* caller frees if != NULL */)
{
FILE *fp;
const gchar *P7_332 = "P7 332";
gchar P7_buf[7];
gchar linebuf[200];
guchar *buf;
gint twofivefive;
void *ptr;
*w = *h = 0;
*imginfo = NULL;
fp = fopen (fnam, "rb");
if (!fp)
return NULL;
fread (P7_buf, 6, 1, fp);
if (strncmp(P7_buf, P7_332, 6)!=0)
{
g_warning ("Thumbnail doesn't have the 'P7 332' header.");
fclose (fp);
return NULL;
}
/*newline*/
fread (P7_buf, 1, 1, fp);
do
{
ptr = fgets(linebuf, 199, fp);
if ((strncmp(linebuf, "#IMGINFO:", 9) == 0) &&
(linebuf[9] != '\0') &&
(linebuf[9] != '\n'))
{
if (linebuf[strlen(linebuf)-1] == '\n')
linebuf[strlen(linebuf)-1] = '\0';
if (linebuf[9] != '\0')
{
if (*imginfo)
g_free(*imginfo);
*imginfo = g_strdup (&linebuf[9]);
}
}
}
while (ptr && linebuf[0]=='#'); /* keep throwing away comment lines */
if (!ptr)
{
/* g_warning("Thumbnail ended - not an image?"); */
fclose (fp);
return NULL;
}
sscanf(linebuf, "%d %d %d\n", w, h, &twofivefive);
if (twofivefive!=255)
{
g_warning ("Thumbnail is of funky depth.");
fclose (fp);
return NULL;
}
if ((*w)<1 || (*h)<1 || (*w)>80 || (*h)>60)
{
g_warning ("Thumbnail size bad. Corrupted?");
fclose (fp);
return NULL;
}
buf = g_malloc ((*w) * (*h));
fread (buf, (*w) * (*h), 1, fp);
fclose (fp);
return buf;
}
gboolean
file_save_thumbnail (GimpImage *gimage,
const gchar *full_source_filename,
TempBuf *tempbuf)
{
gint i,j;
gint w,h;
guchar *tbd;
gchar *pathname;
gchar *filename;
gchar *xvpathname;
gchar *thumbnailname;
GimpImageBaseType basetype;
FILE *fp;
struct stat statbuf;
if (stat (full_source_filename, &statbuf) != 0)
{
return FALSE;
}
pathname = g_dirname (full_source_filename);
filename = g_basename (full_source_filename); /* Don't free! */
xvpathname = g_strconcat (pathname, G_DIR_SEPARATOR_S, ".xvpics",
NULL);
thumbnailname = g_strconcat (xvpathname, G_DIR_SEPARATOR_S,
filename,
NULL);
tbd = temp_buf_data (tempbuf);
w = tempbuf->width;
h = tempbuf->height;
/*printf("tn: %d x %d\n", w, h);fflush(stdout);*/
mkdir (xvpathname, 0755);
fp = fopen (thumbnailname, "wb");
g_free (pathname);
g_free (xvpathname);
g_free (thumbnailname);
if (fp)
{
basetype = gimp_image_base_type (gimage);
fprintf (fp,
"P7 332\n#IMGINFO:%dx%d %s (%d %s)\n"
"#END_OF_COMMENTS\n%d %d 255\n",
gimage->width, gimage->height,
(basetype == RGB) ? "RGB" :
(basetype == GRAY) ? "Greyscale" :
(basetype == INDEXED) ? "Indexed" :
"(UNKNOWN COLOUR TYPE)",
(int)statbuf.st_size,
(statbuf.st_size == 1) ? "byte" : "bytes",
w, h);
switch (basetype)
{
case INDEXED:
case RGB:
for (i=0; i<h; i++)
{
/* Do a cheap unidirectional error-spread to look better */
gint rerr=0, gerr=0, berr=0, a;
for (j=0; j<w; j++)
{
gint32 r,g,b;
if (128 & *(tbd + 3))
{
r = *(tbd++) + rerr;
g = *(tbd++) + gerr;
b = *(tbd++) + berr;
tbd++;
}
else
{
a = (( (i^j) & 4 ) << 5) | 64; /* cute. */
r = a + rerr;
g = a + gerr;
b = a + berr;
tbd += 4;
}
r = CLAMP0255 (r);
g = CLAMP0255 (g);
b = CLAMP0255 (b);
fputc(((r>>5)<<5) | ((g>>5)<<2) | (b>>6), fp);
rerr = r - ( (r>>5) * 255 ) / 7;
gerr = g - ( (g>>5) * 255 ) / 7;
berr = b - ( (b>>6) * 255 ) / 3;
}
}
break;
case GRAY:
for (i=0; i<h; i++)
{
/* Do a cheap unidirectional error-spread to look better */
gint b3err=0, b2err=0, v, a;
for (j=0; j<w; j++)
{
gint32 b3, b2;
v = *(tbd++);
a = *(tbd++);
if (!(128 & a))
v = (( (i^j) & 4 ) << 5) | 64;
b2 = v + b2err;
b3 = v + b3err;
b2 = CLAMP0255 (b2);
b3 = CLAMP0255 (b3);
fputc(((b3>>5)<<5) | ((b3>>5)<<2) | (b2>>6), fp);
b2err = b2 - ( (b2>>6) * 255 ) / 3;
b3err = b3 - ( (b3>>5) * 255 ) / 7;
}
}
break;
default:
g_warning("UNKNOWN GIMAGE TYPE IN THUMBNAIL SAVE");
break;
}
fclose (fp);
}
else /* Error writing thumbnail */
{
return FALSE;
}
return TRUE;
}
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