177 lines
4.6 KiB
C
177 lines
4.6 KiB
C
/* im_system_image(): run a command on an image, get an image result
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*
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* 8/1/09
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* - from im_system()
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* 2/2/10
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* - gtkdoc
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /*HAVE_UNISTD_H*/
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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#define IM_MAX_STRSIZE (4096)
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static int
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system_image( IMAGE *im,
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IMAGE *in_image, char *out_name, const char *cmd_format,
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char **log )
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{
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const char *in_name = in_image->filename;
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FILE *fp;
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char line[IM_MAX_STRSIZE];
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char txt[IM_MAX_STRSIZE];
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VipsBuf buf = VIPS_BUF_STATIC( txt );
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int result;
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if( im_copy( im, in_image ) ||
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!(fp = im_popenf( cmd_format, "r", in_name, out_name )) )
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return( -1 );
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while( fgets( line, IM_MAX_STRSIZE, fp ) )
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if( !vips_buf_appends( &buf, line ) )
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break;
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result = pclose( fp );
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if( log )
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*log = im_strdup( NULL, vips_buf_all( &buf ) );
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return( result );
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}
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/**
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* im_system_image:
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* @im: image to run command on
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* @in_format: write input file like this
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* @out_format: write output filename like this
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* @cmd_format: command to run
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* @log: stdout of command is returned here
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*
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* im_system_image() runs a command, passing an image in and getting an image
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* back. The command's stdout is returned in @log.
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*
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* First, @im is written to a file. The filename is formed by substituting
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* something like "vips-49857-1" for the first %%s in @in_format, then
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* prepending "/tmp". If the environment variable TMPDIR is defined, it
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* can be used to set a different temporary directory. If @in_format is
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* something like "%%s.png", the file will be written in PNG format.
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*
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* On Windows, if the environment variable TMPDIR is not defined, VIPS calls
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* GetTempPath() to get the user's preferred temporary area. If that fails, it
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* defaults to C:\temp.
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*
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* Next an output filename is created in the same way using @out_format. The
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* command string to run is made by substituting the first %%s in @cmd_format
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* for the name of the input file and the second %%s for the output filename.
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*
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* The command is executed with popen() and the output captured in @log. If
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* the command fails, the temporary files are deleted and im_system_image()
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* returns NULL. @log is still set.
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*
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* If the command succeeds, the input file is deleted, the output file opened,
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* and returned. Closing the output image will automatically delete the file.
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*
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* In all cases, @log must be freed with im_free().
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*
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* For example, this call will run the ImageMagick convert program on an
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* image, using JPEG files to pass images into and out of the convert command.
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*
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* |[
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* im_system_image( in, out,
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* "%s.jpg", "%s.jpg", "convert %s -swirl 45 %s",
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* &log )
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* ]|
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*
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* See also: im_system().
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*
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* Returns: an image on success, NULL on error
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*/
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IMAGE *
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im_system_image( IMAGE *im,
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const char *in_format, const char *out_format, const char *cmd_format,
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char **log )
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{
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IMAGE *in_image;
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char *out_name;
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IMAGE *out;
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if( log )
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*log = NULL;
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if( !(in_image = im__open_temp( in_format )) )
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return( NULL );
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if( !(out_name = im__temp_name( out_format )) ) {
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im_close( in_image );
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return( NULL );
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}
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if( system_image( im, in_image, out_name, cmd_format, log ) ) {
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im_close( in_image );
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g_free( out_name );
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return( NULL );
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}
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im_close( in_image );
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if( !(out = im_open( out_name, "r" )) ) {
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g_free( out_name );
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return( NULL );
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}
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if( im_add_postclose_callback( out,
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(im_callback_fn) unlink, out->filename, NULL ) ) {
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g_free( out_name );
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im_close( out );
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g_unlink( out_name );
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return( NULL );
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}
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g_free( out_name );
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return( out );
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}
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