1/*****************************************************************************/
2// Parallel port transport add-on.
3//
4// Author
5//   Michael Pfeiffer
6//
7// This application and all source files used in its construction, except
8// where noted, are licensed under the MIT License, and have been written
9// and are:
10//
11// Copyright (c) 2001,2002 OpenBeOS Project
12//
13// Permission is hereby granted, free of charge, to any person obtaining a
14// copy of this software and associated documentation files (the "Software"),
15// to deal in the Software without restriction, including without limitation
16// the rights to use, copy, modify, merge, publish, distribute, sublicense,
17// and/or sell copies of the Software, and to permit persons to whom the
18// Software is furnished to do so, subject to the following conditions:
19//
20// The above copyright notice and this permission notice shall be included
21// in all copies or substantial portions of the Software.
22//
23// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
24// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
26// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
27// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
28// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
29// DEALINGS IN THE SOFTWARE.
30/*****************************************************************************/
31
32#include <unistd.h>
33#include <stdio.h>
34
35#include <StorageKit.h>
36#include <SupportKit.h>
37
38#include "PrintTransportAddOn.h"
39
40class ParallelTransport : public BDataIO {
41public:
42	ParallelTransport(BDirectory* printer, BMessage* msg);
43	~ParallelTransport();
44
45	status_t InitCheck() { return fFile > -1 ? B_OK : B_ERROR; }
46
47	ssize_t Read(void* buffer, size_t size);
48	ssize_t Write(const void* buffer, size_t size);
49
50private:
51	int fFile;
52};
53
54// Implementation of ParallelTransport
55ParallelTransport::ParallelTransport(BDirectory* printer, BMessage* msg)
56	: fFile(-1)
57{
58	char address[80];
59	char device[B_PATH_NAME_LENGTH];
60	bool bidirectional = true;
61
62	unsigned int size = printer->ReadAttr("transport_address", B_STRING_TYPE, 0, address, sizeof(address));
63	if (size <= 0 || size >= sizeof(address)) return;
64	address[size] = 0; // make sure string is 0-terminated
65
66	strcat(strcpy(device, "/dev/parallel/"), address);
67	fFile = open(device, O_RDWR | O_EXCL, 0);
68	if (fFile < 0) {
69		// Try unidirectional access mode
70		bidirectional = false;
71		fFile = open(device, O_WRONLY | O_EXCL, 0);
72	}
73
74	if (fFile < 0)
75		return;
76
77	if (! msg)
78		// Caller don't care about transport init message output content...
79		return;
80
81	msg->what = 'okok';
82	msg->AddBool("bidirectional", bidirectional);
83	msg->AddString("_parallel/DeviceName", device);
84}
85
86ParallelTransport::~ParallelTransport()
87{
88	if (InitCheck() == B_OK)
89		close(fFile);
90}
91
92ssize_t ParallelTransport::Read(void* buffer, size_t size)
93{
94	return read(fFile, buffer, size);
95}
96
97ssize_t ParallelTransport::Write(const void* buffer, size_t size)
98{
99	return write(fFile, buffer, size);
100}
101
102BDataIO* instantiate_transport(BDirectory* printer, BMessage* msg)
103{
104	ParallelTransport* transport = new ParallelTransport(printer, msg);
105	if (transport->InitCheck() == B_OK)
106		return transport;
107
108	delete transport;
109	return NULL;
110}
111
112status_t list_transport_ports(BMessage* msg)
113{
114	BDirectory dir("/dev/parallel");
115	status_t rc;
116
117	if ((rc=dir.InitCheck()) != B_OK)
118		return rc;
119
120	if ((rc=dir.Rewind()) != B_OK)
121		return rc;
122
123	entry_ref ref;
124	while(dir.GetNextRef(&ref) == B_OK)
125		msg->AddString("port_id", ref.name);
126
127	return B_OK;
128}
129
130