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[gapil.git] / sources / BarCodePage.c

diff --git a/sources/BarCodePage.c b/sources/BarCodePage.c
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+/* BarCodePage.c
+ * 
+ * Copyright (C) 2002 Simone Piccardi
+ * 
+ * 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.
+ */
+/****************************************************************
+ *
+ * Program barcode 
+ * CGI for barcode generation
+ *
+ * Author: Simone Piccardi
+ * Jun. 2002
+ *
+ * Usage: cgi-bin for apache.
+ * Called by downloading something like:
+ * http://localhost/cgi-bin/barcode?string
+ * where string is the code to be converted
+ *
+ * $Id: BarCodePage.c,v 1.4 2003/05/02 09:55:13 piccardi Exp $ 
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
+#include <sys/types.h>   /* predefined types */
+#include <sys/stat.h>    /* stat deinitiions */
+#include <unistd.h>      /* include unix standard library */
+#include <stdio.h>      /* include standard I/O library */
+#include <stdlib.h>     /* include standard library */
+#include <string.h>     /* include string library */
+#include <wait.h>       /* include wait call */
+#include <fcntl.h>
+#include <assert.h>
+#include <time.h>
+
+#include"macros.h"
+void WriteMess(char *mess);
+
+/* Program begin */
+int main(int argc, char *argv[], char *envp[])
+{
+/*
+ * Variables definition         
+ */
+    pid_t pid;
+    int retval;
+    int pipein[2];
+    int pipeout[2];
+    char content[]="Content-type: image/jpeg\n\n";
+    char size[]="-pA9";
+    /* 
+     * Begin
+     */
+    /* create two pipes, pipein and pipeout, to handle communication */
+    if ( (retval = pipe(pipein)) ) {
+       WriteMess("input pipe creation error");
+       exit(0);        
+    }
+    if ( (retval = pipe(pipeout)) ) {
+       WriteMess("output pipe creation error");
+       exit(0);        
+    }   
+    /* First fork: use child to run barcode program */
+    if ( (pid = fork()) == -1 ) {
+       WriteMess("child creation error");
+       exit(0);
+    }
+    /* if child */
+    if (pid == 0) {
+       /*
+        * Child exec barcode program, that take input (string to encode)
+        * from pipein, remapped to stdin, and write the output (a PS
+        * image) to stdout, remapped to pipeout 
+        */
+       close(pipein[1]);                /* close output side of input pipe */
+       dup2(pipein[0], STDIN_FILENO);   /* remap stdin in pipe input */
+       close(pipeout[0]);
+       dup2(pipeout[1], STDOUT_FILENO); /* remap stdout in pipe output */
+       execlp("barcode", "barcode", size, NULL); 
+    } 
+    /*
+     * Parent write string to pipe input and close it, 
+     * then wait child execution and results form pipeout, 
+     * then fork to convert PS to JPEG using gs
+     */
+    close(pipein[0]);        /* close input side of input pipe */
+    write(pipein[1], argv[1], strlen(argv[1]));
+    close(pipein[1]);
+    waitpid(pid, NULL, 0);
+    /* Second fork: use child to run ghostscript*/
+    if ( (pid = fork()) == -1) {
+       WriteMess("child creation error");
+       exit(0);
+    }
+    /* second child, convert PS to JPEG */
+    if (pid == 0) {
+       close(pipeout[1]);              /* close write end */
+       dup2(pipeout[0], STDIN_FILENO); /* remap read end to stdin */
+       /* send mime type */
+       write(STDOUT_FILENO, content, strlen(content));
+       execlp("gs", "gs", "-q", "-sDEVICE=jpeg", "-sOutputFile=-", "-", NULL);
+    }
+    /* still parent */
+    close(pipeout[1]); 
+    waitpid(pid, NULL, 0);
+    exit(0);
+}
+/*
+ * Routine to produce an HTML error message on output 
+ */
+void WriteMess(char *mess)
+{
+    printf("Content-type: text/html\n\n");
+    perror(mess);
+    printf("<br>\n");
+}