1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
#pragma once
#include <Exceptions.h>
#include <Printer.h>
#include <BString.h>
#include <Atomic.h>
namespace Balau {
class FileSystem {
public:
static int mkdir(const char * path) throw (GeneralException);
};
class ENoEnt : public GeneralException {
public:
ENoEnt(const char * name) : GeneralException(String("No such file or directory: `") + name + "'") { }
ENoEnt(const String & name) : ENoEnt(name.to_charp()) { }
};
class IOBase;
template<class T>
class IO;
namespace Events {
class BaseEvent;
};
class Handle {
public:
virtual ~Handle() { AAssert(m_refCount == 0, "Do not use handles directly; warp them in IO<>"); }
virtual void close() throw (GeneralException) = 0;
virtual bool isClosed() = 0;
virtual bool isEOF() = 0;
virtual bool canSeek();
virtual bool canRead();
virtual bool canWrite();
virtual const char * getName() = 0;
virtual ssize_t read(void * buf, size_t count) throw (GeneralException);
virtual ssize_t write(const void * buf, size_t count) throw (GeneralException);
template <size_t L> void writeString(const char (&str)[L]) { writeString(str, L - 1); }
void writeString(const char * str, ssize_t len) { if (len < 0) len = strlen(str); forceWrite(str, len); }
void writeString(const String & str) { forceWrite(str.to_charp(), str.strlen()); }
void seek(off_t offset, int whence = SEEK_SET) { rseek(offset, whence); }
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
off_t tell() { return rtell(); }
virtual off_t rtell() throw (GeneralException);
virtual off_t wtell() throw (GeneralException);
virtual off_t getSize();
virtual time_t getMTime();
virtual bool isPendingComplete() { return true; }
ssize_t forceRead(void * buf, size_t count, Events::BaseEvent * evt = NULL) throw (GeneralException);
ssize_t forceWrite(const void * buf, size_t count, Events::BaseEvent * evt = NULL) throw (GeneralException);
ssize_t write(const String & str) { return write(str.to_charp(), str.strlen()); }
ssize_t forceWrite(const String & str) { return forceWrite(str.to_charp(), str.strlen()); }
uint8_t readU8() { uint8_t r; read(&r, 1); return r; }
protected:
Handle() { }
private:
void addRef() { Atomic::Increment(&m_refCount); }
void delRef() {
if (Atomic::Decrement(&m_refCount) == 0) {
if (!isClosed())
close();
delete this;
}
}
friend class IOBase;
template<class T>
friend class IO;
volatile int m_refCount = 0;
Handle(const Handle &) = delete;
Handle & operator=(const Handle &) = delete;
};
class HPrinter : public Handle {
public:
virtual void close() throw (GeneralException) { }
virtual bool isClosed() { return false; }
virtual bool isEOF() { return false; }
virtual bool canWrite() { return true; }
virtual const char * getName() { return "HPrinter"; }
virtual ssize_t write(const void * buf, size_t count) throw (GeneralException) {
Printer::print("%*s", (int) count, (const char *) buf);
return count;
}
};
class IOBase {
private:
IOBase() { }
~IOBase() { if (m_h) m_h->delRef(); }
void setHandle(Handle * h) { m_h = h; if (m_h) m_h->addRef(); }
Handle * m_h = NULL;
template<class T>
friend class IO;
};
template<class T>
class IO : public IOBase {
public:
IO() { }
IO(T * h) { setHandle(h); }
IO(const IO<T> & io) { if (io.m_h) setHandle(io.m_h); }
IO(IO<T> && io) { m_h = io.m_h; io.m_h = NULL; }
template<class U>
IO(const IO<U> & io) { if (io.m_h) setHandle(io.m_h); }
template<class U>
IO(IO<U> && io) { m_h = io.m_h; io.m_h = NULL; }
template<class U>
bool isA() { return !!dynamic_cast<U *>(m_h); }
template<class U>
IO<U> asA() { IO<U> h(dynamic_cast<U *>(m_h)); return h; }
IO<T> & operator=(const IO<T> & io) { if (m_h) m_h->delRef(); setHandle(io.m_h); return *this; }
T * operator->() {
AAssert(m_h, "Can't use %s->() with a null Handle", ClassName(this).c_str());
T * r = dynamic_cast<T *>(m_h);
AAssert(r, "%s->() used with an incompatible Handle type", ClassName(this).c_str());
return r;
}
bool isNull() { return dynamic_cast<T *>(m_h); }
};
class SeekableHandle : public Handle {
public:
SeekableHandle() : m_wOffset(0), m_rOffset(0) { }
virtual bool canSeek();
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
virtual off_t rtell() throw (GeneralException);
virtual off_t wtell() throw (GeneralException);
virtual bool isEOF();
protected:
off_t getWOffset() { return m_wOffset; }
off_t getROffset() { return m_rOffset; }
private:
off_t m_wOffset, m_rOffset;
};
class ReadOnly : public Handle {
public:
ReadOnly(IO<Handle> & io) : m_io(io) { AAssert(m_io->canRead(), "You need to use ReadOnly with a Handle that can at least read"); }
virtual void close() throw (GeneralException) { m_io->close(); }
virtual bool isClosed() { return m_io->isClosed(); }
virtual bool isEOF() { return m_io->isEOF(); }
virtual bool canSeek() { return m_io->canSeek(); }
virtual bool canRead() { return true; }
virtual bool canWrite() { return false; }
virtual const char * getName() { return m_io->getName(); }
virtual ssize_t read(void * buf, size_t count) throw (GeneralException) { return m_io->read(buf, count); }
virtual ssize_t write(const void * buf, size_t count) throw (GeneralException) { throw GeneralException("Can't write"); }
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException) { m_io->rseek(offset, whence); }
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException) { throw GeneralException("Can't write"); }
virtual off_t rtell() throw (GeneralException) { return m_io->rtell(); }
virtual off_t wtell() throw (GeneralException) { throw GeneralException("Can't write"); }
virtual off_t getSize() { return m_io->getSize(); }
virtual time_t getMTime() { return m_io->getMTime(); }
private:
IO<Handle> m_io;
};
class WriteOnly : public Handle {
public:
WriteOnly(IO<Handle> & io) : m_io(io) { AAssert(m_io->canWrite(), "You need to use WriteOnly with a Handle that can at least write"); }
virtual void close() throw (GeneralException) { m_io->close(); }
virtual bool isClosed() { return m_io->isClosed(); }
virtual bool isEOF() { return m_io->isEOF(); }
virtual bool canSeek() { return m_io->canSeek(); }
virtual bool canRead() { return false; }
virtual bool canWrite() { return true; }
virtual const char * getName() { return m_io->getName(); }
virtual ssize_t read(void * buf, size_t count) throw (GeneralException) { throw GeneralException("Can't read"); }
virtual ssize_t write(const void * buf, size_t count) throw (GeneralException) { return m_io->write(buf, count); }
virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException) { throw GeneralException("Can't read"); }
virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException) { return m_io->wseek(offset, whence); }
virtual off_t rtell() throw (GeneralException) { throw GeneralException("Can't read"); }
virtual off_t wtell() throw (GeneralException) { return m_io->wtell(); }
virtual off_t getSize() { return m_io->getSize(); }
virtual time_t getMTime() { return m_io->getMTime(); }
private:
IO<Handle> m_io;
};
};
|
