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gimp/plug-ins/common/gz.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1997 Daniel Risacher, magnus@alum.mit.edu
*
* 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.
*/
/* Minor changes to support file magic */
/* 4 Oct 1997 -- Risacher */
/* gzip plug-in for the gimp */
/* loosley based on url.c by */
/* Josh MacDonald, jmacd@cs.berkeley.edu */
/* and, very loosely on hrz.c by */
/* Albert Cahalan <acahalan at cs.uml.edu> */
/* This is reads and writes gziped image files for the Gimp
*
* You need to have gzip installed for it to work.
*
* It should work with file names of the form
* filename.foo.gz where foo is some already-recognized extension
*
* and it also works for names of the form
* filename.xcfgz - which is equivalent to
* filename.xcf.gz
*
* I added the xcfgz bit because having a default extension of xcf.gz
* can confuse the file selection dialog box somewhat, forcing the
* user to type sometimes when he/she otherwise wouldn't need to.
*
* I later decided I didn't like it because I don't like to bloat
* the file-extension namespace. But I left in the recognition
* feature/bug so if people want to use files named foo.xcfgz by
* default, they can just hack their pluginrc file.
*
* to do this hack, change :
* "xcf.gz,gz,xcfgz"
* to
* "xcfgz,gz,xcf.gz"
*
*
* -Dan Risacher, 0430 CDT, 26 May 1997
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
/* Author 1: Josh MacDonald (url.c) */
/* Author 2: Daniel Risacher (gz.c) */
/* According to USAF Lt Steve Werhle, US DoD software development
* contracts average about $25 USD per source line of code (SLOC). By
* that metric, I figure this plug-in is worth about $10,000 USD */
/* But you got it free. Magic of Gnu. */
static void query (void);
static void run (char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals);
static gint32 load_image (char *filename, gint32 run_mode);
static gint save_image (char *filename,
gint32 image_ID,
gint32 drawable_ID,
gint32 run_mode);
static int valid_file (char* filename) ;
static char* find_extension (char* filename);
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
static void
query ()
{
static GParamDef load_args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_STRING, "filename", "The name of the file to load" },
{ PARAM_STRING, "raw_filename", "The name entered" },
};
static GParamDef load_return_vals[] =
{
{ PARAM_IMAGE, "image", "Output image" },
};
static int nload_args = sizeof (load_args) / sizeof (load_args[0]);
static int nload_return_vals = sizeof (load_return_vals) / sizeof (load_return_vals[0]);
static GParamDef save_args[] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image" },
{ PARAM_DRAWABLE, "drawable", "Drawable to save" },
{ PARAM_STRING, "filename", "The name of the file to save the image in" },
{ PARAM_STRING, "raw_filename", "The name of the file to save the image in" }
};
static int nsave_args = sizeof (save_args) / sizeof (save_args[0]);
gimp_install_procedure ("file_gz_load",
"loads files compressed with gzip",
"You need to have gzip installed.",
"Daniel Risacher",
"Daniel Risacher, Spencer Kimball and Peter Mattis",
"1995-1997",
"<Load>/gzip",
NULL,
PROC_PLUG_IN,
nload_args, nload_return_vals,
load_args, load_return_vals);
gimp_install_procedure ("file_gz_save",
"saves files compressed with gzip",
"You need to have gzip installed",
"Daniel Risacher",
"Daniel Risacher, Spencer Kimball and Peter Mattis",
"1995-1997",
"<Save>/gzip",
"RGB*, GRAY*, INDEXED*",
PROC_PLUG_IN,
nsave_args, 0,
save_args, NULL);
gimp_register_magic_load_handler ("file_gz_load", "xcf.gz,gz,xcfgz",
"", "0,string,\037\213");
gimp_register_save_handler ("file_gz_save", "xcf.gz,gz,xcfgz", "");
}
static void
run (char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals)
{
static GParam values[2];
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
gint32 image_ID;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = STATUS_CALLING_ERROR;
if (strcmp (name, "file_gz_load") == 0)
{
image_ID = load_image (param[1].data.d_string,
param[0].data.d_int32);
if (image_ID != -1)
{
*nreturn_vals = 2;
values[0].data.d_status = STATUS_SUCCESS;
values[1].type = PARAM_IMAGE;
values[1].data.d_image = image_ID;
}
else
{
values[0].data.d_status = STATUS_EXECUTION_ERROR;
g_assert (FALSE);
}
}
else if (strcmp (name, "file_gz_save") == 0)
{
switch (run_mode)
{
case RUN_INTERACTIVE:
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 4)
status = STATUS_CALLING_ERROR;
case RUN_WITH_LAST_VALS:
break;
default:
break;
}
*nreturn_vals = 1;
if (save_image (param[3].data.d_string,
param[1].data.d_int32,
param[2].data.d_int32,
param[0].data.d_int32 ))
{
values[0].data.d_status = STATUS_SUCCESS;
}
else
values[0].data.d_status = STATUS_EXECUTION_ERROR;
}
else
g_assert (FALSE);
}
static gint
save_image (char *filename,
gint32 image_ID,
gint32 drawable_ID,
gint32 run_mode)
{
FILE* f;
GParam* params;
gint retvals;
char* ext;
char* tmpname;
int pid;
int status;
ext = find_extension(filename);
if (0 == *ext) {
g_message("gz: no sensible extension, saving as gzip'd xcf\n");
ext = ".xcf";
}
/* get a temp name with the right extension and save into it. */
params = gimp_run_procedure ("gimp_temp_name",
&retvals,
PARAM_STRING, ext + 1,
PARAM_END);
tmpname = params[1].data.d_string;
params = gimp_run_procedure ("gimp_file_save",
&retvals,
PARAM_INT32, run_mode,
PARAM_IMAGE, image_ID,
PARAM_DRAWABLE, drawable_ID,
PARAM_STRING, tmpname,
PARAM_STRING, tmpname,
PARAM_END);
if (params[0].data.d_status == FALSE || !valid_file(tmpname)) {
unlink (tmpname);
return -1;
}
/* if (! file_save(image_ID, tmpname, tmpname)) { */
/* unlink (tmpname); */
/* return -1; */
/* } */
/* fork off a gzip process */
if ((pid = fork()) < 0)
{
g_message ("gz: fork failed: %s\n", g_strerror(errno));
return -1;
}
else if (pid == 0)
{
if (!(f = fopen(filename,"w"))){
g_message("gz: fopen failed: %s\n", g_strerror(errno));
_exit(127);
}
/* make stdout for this process be the output file */
if (-1 == dup2(fileno(f),fileno(stdout)))
g_message ("gz: dup2 failed: %s\n", g_strerror(errno));
/* and gzip into it */
execlp ("gzip", "gzip", "-cf", tmpname, NULL);
g_message ("gz: exec failed: gzip: %s\n", g_strerror(errno));
_exit(127);
}
else
{
waitpid (pid, &status, 0);
if (!WIFEXITED(status) ||
WEXITSTATUS(status) != 0)
{
g_message ("gz: gzip exited abnormally on file %s\n", tmpname);
return 0;
}
}
unlink (tmpname);
return TRUE;
}
static gint32
load_image (char *filename, gint32 run_mode)
{
GParam* params;
gint retvals;
char* ext;
char* tmpname;
int pid;
int status;
ext = find_extension(filename);
if (0 == *ext) {
g_message("gz: no sensible extension, attempting to load with file magic\n");
}
/* find a temp name */
params = gimp_run_procedure ("gimp_temp_name",
&retvals,
PARAM_STRING, ext + 1,
PARAM_END);
tmpname = params[1].data.d_string;
/* fork off a g(un)zip and wait for it */
if ((pid = fork()) < 0)
{
g_message ("gz: fork failed: %s\n", g_strerror(errno));
return -1;
}
else if (pid == 0) /* child process */
{
FILE* f;
if (!(f = fopen(tmpname,"w"))){
g_message("gz: fopen failed: %s\n", g_strerror(errno));
_exit(127);
}
/* make stdout for this child process be the temp file */
if (-1 == dup2(fileno(f),fileno(stdout)))
g_message ("gz: dup2 failed: %s\n", g_strerror(errno));
/* and unzip into it */
execlp ("gzip", "gzip", "-cfd", filename, NULL);
g_message ("gz: exec failed: gunzip: %s\n", g_strerror(errno));
_exit(127);
}
else /* parent process */
{
waitpid (pid, &status, 0);
if (!WIFEXITED(status) ||
WEXITSTATUS(status) != 0)
{
g_message ("gz: gzip exited abnormally on file %s\n", filename);
return -1;
}
}
/* now that we un-gziped it, load the temp file */
params = gimp_run_procedure ("gimp_file_load",
&retvals,
PARAM_INT32, run_mode,
PARAM_STRING, tmpname,
PARAM_STRING, tmpname,
PARAM_END);
unlink (tmpname);
if (params[0].data.d_status == FALSE)
return -1;
else
{
gimp_image_set_filename (params[1].data.d_int32, filename);
return params[1].data.d_int32;
}
}
static int valid_file (char* filename)
{
int stat_res;
struct stat buf;
stat_res = stat(filename, &buf);
if ((0 == stat_res) && (buf.st_size > 0))
return 1;
else
return 0;
}
static char* find_extension (char* filename)
{
char* filename_copy;
char* ext;
/* we never free this copy - aren't we evil! */
filename_copy = malloc(strlen(filename)+1);
strcpy(filename_copy, filename);
/* find the extension, boy! */
ext = strrchr (filename_copy, '.');
while (1) {
if (!ext || ext[1] == 0 || strchr(ext, '/'))
{
return "";
}
if (0 == strcmp(ext, ".xcfgz")) {
return ".xcf"; /* we've found it */
}
if (0 != strcmp(ext,".gz")) {
return ext;
} else {
/* we found ".gz" so strip it, loop back, and look again */
*ext = 0;
ext = strrchr (filename_copy, '.');
}
}
}
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