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
|
// Copyright 2006 Ben Hutchings <ben@decadent.org.uk>.
// See the file "COPYING" for licence details.
#include <cerrno>
#include <cstring>
#include <sstream>
#include <unistd.h>
#include <fcntl.h>
#include <expat.h>
#include <glibmm/fileutils.h>
#include <glibmm/miscutils.h>
#include "auto_fd.hpp"
#include "auto_handle.hpp"
#include "vob_list.hpp"
namespace
{
struct xml_parser_closer
{
void operator()(XML_Parser parser) const
{
if (parser)
XML_ParserFree(parser);
}
};
struct xml_parser_factory
{
XML_Parser operator()() const
{
return NULL;
}
};
typedef auto_handle<XML_Parser, xml_parser_closer, xml_parser_factory>
auto_xml_parser;
struct parse_context
{
parse_context(XML_Parser parser,
const std::string & list_path,
vob_list & list)
: parser(parser),
list_path(list_path),
base_path(Glib::path_get_dirname(list_path)),
list(list),
level(0)
{}
XML_Parser parser;
const std::string & list_path;
std::string base_path;
vob_list & list;
std::auto_ptr<xml_error> parse_error;
unsigned level;
};
void start_element_handler(void * user_data,
const char * name,
const char ** attributes)
{
parse_context & context = *static_cast<parse_context *>(user_data);
if (context.level == 0 && std::strcmp(name, "vob-list") == 0)
{
// We don't expect (and will ignore) any attributes.
}
else if (context.level == 1 && std::strcmp(name, "vob") == 0)
{
vob_ref ref;
while (attributes[0] != NULL)
{
if (std::strcmp(attributes[0], "file") == 0)
{
ref.file = attributes[1];
if (!Glib::path_is_absolute(ref.file))
ref.file = Glib::build_filename(context.base_path,
ref.file);
}
else if (std::strcmp(attributes[0], "chapters") == 0)
{
ref.chapters = attributes[1];
}
else if (std::strcmp(attributes[0], "pause") == 0)
{
ref.pause = attributes[1];
}
attributes += 2;
}
if (ref.file.empty())
{
context.parse_error.reset(
new xml_error(
context.list_path,
XML_GetCurrentLineNumber(context.parser),
"<vob> element missing file attribute"));
}
else
{
context.list.push_back(ref);
}
}
else // not root <vob-list> or child <vob>
{
context.parse_error.reset(
new xml_error(
context.list_path,
XML_GetCurrentLineNumber(context.parser),
std::string("unexpected element: <").append(name)
.append(">")));
}
++context.level;
}
void end_element_handler(void * user_data,
const char * /*name*/)
{
parse_context & context = *static_cast<parse_context *>(user_data);
--context.level;
}
}
vob_list read_vob_list(const std::string & path)
{
vob_list result;
auto_fd fd(open(path.c_str(), O_RDONLY, 0));
if (fd.get() < 0)
// FIXME: look up proper error code
throw Glib::FileError(Glib::FileError::FAILED,
std::strerror(errno));
auto_xml_parser parser(XML_ParserCreate(NULL));
if (parser.get() == NULL)
throw std::bad_alloc(); // any other reason?
parse_context context(parser.get(), path, result);
XML_SetUserData(parser.get(), &context);
XML_SetStartElementHandler(parser.get(), start_element_handler);
XML_SetEndElementHandler(parser.get(), end_element_handler);
for (;;)
{
static const int buffer_size = 1024;
void * buffer = XML_GetBuffer(parser.get(), buffer_size);
if (buffer == NULL)
throw std::bad_alloc();
int read_size = read(fd.get(), buffer, buffer_size);
if (read_size < 0)
// FIXME: look up proper error code
throw Glib::FileError(Glib::FileError::FAILED,
std::strerror(errno));
bool is_final = read_size < buffer_size;
if (XML_ParseBuffer(parser.get(), read_size, is_final)
== XML_STATUS_ERROR)
throw xml_error(path,
XML_GetCurrentLineNumber(parser.get()),
XML_ErrorString(XML_GetErrorCode(parser.get())));
if (context.parse_error.get())
throw *context.parse_error;
if (is_final)
break;
}
return result;
}
namespace
{
std::string make_xml_error_message(const std::string & path, int line,
const std::string & message)
{
std::ostringstream os;
os << path << ":" << line << ": " << message;
return os.str();
}
}
xml_error::xml_error(const std::string & path, int line,
const std::string & message)
: std::runtime_error(make_xml_error_message(path, line, message))
{}
|
