libzypp: zypp-core/base/zckstream.cc Source File

libzypp 17.38.14

zckstream.cc
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1/*---------------------------------------------------------------------\
2| ____ _ __ __ ___ |
3| |__ / \ / / . \ . \ |
4| / / \ V /| _/ _/ |
5| / /__ | | | | | | |
6| /_____||_| |_| |_| |
7| |
8\---------------------------------------------------------------------*/
9#include "zckstream.h"
10#include <zypp-core/base/String.h>
11
12#include <sys/types.h>
13#include <sys/stat.h>
14#include <fcntl.h>
15#include <unistd.h>
16#include <errno.h>
17
18extern "C" {
19#include <zck.h>
20}
21
22namespace zypp {
23
24 namespace detail {
25
26 zckstreambufimpl::~zckstreambufimpl()
27 {
28 closeImpl();
29 }
30
31 bool zckstreambufimpl::openImpl( const char *name_r, std::ios_base::openmode mode_r )
32 {
33 if ( isOpen() )
34 return false;
35
36 if ( mode_r == std::ios_base::in ) {
37 _fd = ::open( name_r, O_RDONLY | O_CLOEXEC );
38 _isReading = true;
39
40 } else if ( mode_r == std::ios_base::out ) {
41 _fd = ::open( name_r, O_WRONLY|O_CREAT|O_CLOEXEC, 0666 );
42 _isReading = false;
43 } else {
44 //unsupported mode
45 _lastErr = str::Format("ZChunk backend does not support the given open mode.");
46 return false;
47 }
48
49 if ( _fd < 0 ) {
50 const int errSrv = errno;
51 _lastErr = str::Format("Opening file failed: %1%") % ::strerror( errSrv );
52 return false;
53 }
54
55 _zContext = ::zck_create();
56 if ( !_zContext ) {
57 setError();
58 return false;
59 }
60
61 if ( _isReading ) {
62 if ( !::zck_init_read( _zContext, _fd ) ) {
63 setError();
64 return false;
65 }
66 } else {
67 if ( !::zck_init_write( _zContext, _fd ) ) {
68 setError();
69 return false;
70 }
71 }
72
73 _currfp = 0;
74 return true;
75 }
76
77 bool zckstreambufimpl::closeImpl()
78 {
79 if ( !isOpen() )
80 return true;
81
82 bool success = true;
83
84 if ( !zck_close( _zContext ) ) {
85 setError();
86 success = false;
87 }
88
89 zck_free( &_zContext );
90 _zContext = nullptr;
91 ::close( _fd );
92 _fd = -1;
93 return success;
94 }
95
96 void zckstreambufimpl::setError()
97 {
98 if ( !zck_is_error( _zContext ) )
99 return;
100 _lastErr = zck_get_error( _zContext );
101 zck_clear_error( _zContext );
102 }
103
104 std::streamsize zckstreambufimpl::readData(char *buffer_r, std::streamsize maxcount_r)
105 {
106 if ( !isOpen() || !canRead() )
107 return -1;
108
109 ssize_t read = zck_read( _zContext, buffer_r, maxcount_r );
110 if ( read > 0 )
111 _currfp += read;
112 else
113 setError();
114
115 return read;
116 }
117
118 bool zckstreambufimpl::writeData(const char *buffer_r, std::streamsize count_r)
119 {
120 if ( !isOpen() || !canWrite() )
121 return false;
122
123 ssize_t wrote = zck_write( _zContext, buffer_r, count_r );
124 if ( wrote > 0 )
125 _currfp += wrote;
126 else
127 setError();
128
129 return wrote;
130 }
131
132 bool zckstreambufimpl::isOpen() const
133 {
134 return ( _fd >= 0 );
135 }
136
137 bool zckstreambufimpl::canRead() const
138 {
139 return _isReading;
140 }
141
142 bool zckstreambufimpl::canWrite() const
143 {
144 return !_isReading;
145 }
146
147 bool zckstreambufimpl::canSeek( std::ios_base::seekdir ) const
148 {
149 return false;
150 }
151
152 off_t zckstreambufimpl::seekTo(off_t, std::ios_base::seekdir , std::ios_base::openmode)
153 {
154 return -1;
155 }
156
157 off_t zckstreambufimpl::tell() const
158 {
159 return _currfp;
160 }
161 }
162
163}
String.h
zypp::detail::zckstreambufimpl::_lastErr
error_type _lastErr
Definition zckstream.h:60
zypp::detail::zckstreambufimpl::_fd
int _fd
Definition zckstream.h:56
zypp::detail::zckstreambufimpl::canRead
bool canRead() const
Definition zckstream.cc:137
zypp::detail::zckstreambufimpl::tell
off_t tell() const
Definition zckstream.cc:157
zypp::detail::zckstreambufimpl::canSeek
bool canSeek(std::ios_base::seekdir way_r) const
Definition zckstream.cc:147
zypp::detail::zckstreambufimpl::_isReading
bool _isReading
Definition zckstream.h:57
zypp::detail::zckstreambufimpl::_zContext
zckCtx * _zContext
Definition zckstream.h:58
zypp::detail::zckstreambufimpl::readData
std::streamsize readData(char *buffer_r, std::streamsize maxcount_r)
Definition zckstream.cc:104
zypp::detail::zckstreambufimpl::_currfp
off_t _currfp
Definition zckstream.h:59
zypp::detail::zckstreambufimpl::setError
void setError()
Definition zckstream.cc:96
zypp::detail::zckstreambufimpl::seekTo
off_t seekTo(off_t off_r, std::ios_base::seekdir way_r, std::ios_base::openmode omode_r)
Definition zckstream.cc:152
zypp::detail::zckstreambufimpl::writeData
bool writeData(const char *buffer_r, std::streamsize count_r)
Definition zckstream.cc:118
zypp::detail::zckstreambufimpl::isOpen
bool isOpen() const
Definition zckstream.cc:132
zypp::detail::zckstreambufimpl::~zckstreambufimpl
~zckstreambufimpl()
Definition zckstream.cc:26
zypp::detail::zckstreambufimpl::openImpl
bool openImpl(const char *name_r, std::ios_base::openmode mode_r)
Definition zckstream.cc:31
zypp::detail::zckstreambufimpl::canWrite
bool canWrite() const
Definition zckstream.cc:142
zypp::detail::zckstreambufimpl::closeImpl
bool closeImpl()
Definition zckstream.cc:77
zypp::detail
Definition PoolQuery.cc:1509
zypp
Easy-to use interface to the ZYPP dependency resolver.
Definition CodePitfalls.doc:2
zypp::str::Format
Convenient building of std::string with boost::format.
Definition String.h:254
zckstream.h