+/* BarCode.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 echod
+ * 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: BarCode.c,v 1.1 2002/06/18 22:11:06 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
+ */
+ char buffer[8192];
+ pid_t pid;
+ size_t n;
+ int retval;
+ int pipein[2];
+ int pipeout[2];
+ char size[]="-pA9";
+ char psize[]="-sPAPERSIZE=a9";
+ char content[]="Content-type: image/jpeg\n\n";
+ /*
+ * Begin
+ */
+ /* create two pipes to handle process communication */
+ if ( (retval = pipe(pipein)) ) {
+ WriteMess("input pipe creation error");
+ exit(0);
+ }
+ if ( (retval = pipe(pipeout)) ) {
+ WriteMess("output pipe creation error");
+ exit(0);
+ }
+ /* fork child to run barcode program */
+ pid = fork();
+ if (pid == -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 ppm
+ * 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); //"-o", "-", NULL);
+ }
+ /*
+ * Parent write string to pipe input and close it,
+ * then wait child execution and results form pipeout,
+ * then fork to convert ppm to gif using ppmtogif
+ */
+ close(pipein[0]); /* close input side of input pipe */
+ n=write(pipein[1], argv[1], strlen(argv[1]));
+ close(pipein[1]);
+ waitpid(pid, NULL, 0);
+ /*
+ * refork to use ppmtogif
+ */
+ pid = fork();
+ if (pid == -1) {
+ WriteMess("child creation error");
+ exit(0);
+ }
+ /*
+ * second child, convert ppm to gif
+ */
+ if (pid == 0) {
+ /* send mime type */
+ close(pipeout[1]);
+ dup2(pipeout[0], STDIN_FILENO);
+ write(STDOUT_FILENO, content, strlen(content));
+ n=read(pipeout[0], buffer, sizeof(buffer));
+ printf("Letti %n di %n, %s\n", n, sizeof(buffer), buffer);
+ exit(0);
+ 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");
+}
projects / gapil.git / commitdiff