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
191
192
193
194
195
196
197
198
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* ostream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#include "sqfs/io.h"
#include "sqfs/error.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
typedef struct {
sqfs_ostream_t base;
sqfs_u64 sparse_count;
char *path;
HANDLE hnd;
int flags;
} file_ostream_t;
static int write_data(file_ostream_t *file, const void *data, size_t size)
{
DWORD diff;
while (size > 0) {
if (!WriteFile(file->hnd, data, size, &diff, NULL))
return SQFS_ERROR_IO;
size -= diff;
data = (const char *)data + diff;
}
return 0;
}
static int realize_sparse(file_ostream_t *file)
{
size_t bufsz, diff;
LARGE_INTEGER pos;
void *buffer;
int ret;
if (file->sparse_count == 0)
return 0;
if (file->flags & SQFS_FILE_OPEN_NO_SPARSE) {
bufsz = file->sparse_count > 1024 ? 1024 : file->sparse_count;
buffer = calloc(1, bufsz);
if (buffer == NULL)
return SQFS_ERROR_ALLOC;
while (file->sparse_count > 0) {
diff = file->sparse_count > bufsz ?
bufsz : file->sparse_count;
ret = write_data(file, buffer, diff);
if (ret) {
DWORD temp = GetLastError();
free(buffer);
SetLastError(temp);
return ret;
}
file->sparse_count -= diff;
}
free(buffer);
} else {
pos.QuadPart = file->sparse_count;
if (!SetFilePointerEx(file->hnd, pos, NULL, FILE_CURRENT))
return SQFS_ERROR_IO;
if (!SetEndOfFile(file->hnd))
return SQFS_ERROR_IO;
file->sparse_count = 0;
}
return 0;
}
static int file_append(sqfs_ostream_t *strm, const void *data, size_t size)
{
file_ostream_t *file = (file_ostream_t *)strm;
int ret;
if (size == 0 || data == NULL) {
file->sparse_count += size;
return 0;
}
ret = realize_sparse(file);
if (ret)
return ret;
return write_data(file, data, size);
}
static int file_flush(sqfs_ostream_t *strm)
{
file_ostream_t *file = (file_ostream_t *)strm;
int ret;
ret = realize_sparse(file);
if (ret)
return ret;
if (!FlushFileBuffers(file->hnd))
return SQFS_ERROR_IO;
return 0;
}
static void file_destroy(sqfs_object_t *obj)
{
file_ostream_t *file = (file_ostream_t *)obj;
CloseHandle(file->hnd);
free(file->path);
free(file);
}
static const char *file_get_filename(sqfs_ostream_t *strm)
{
return ((file_ostream_t *)strm)->path;
}
int ostream_open_handle(sqfs_ostream_t **out, const char *path,
sqfs_file_handle_t hnd, int flags)
{
file_ostream_t *file = calloc(1, sizeof(*file));
sqfs_ostream_t *strm = (sqfs_ostream_t *)file;
BOOL ret;
if (file == NULL)
return SQFS_ERROR_ALLOC;
sqfs_object_init(file, file_destroy, NULL);
file->path = strdup(path);
if (file->path == NULL) {
free(file);
return SQFS_ERROR_ALLOC;
}
ret = DuplicateHandle(GetCurrentProcess(), hnd,
GetCurrentProcess(), &file->hnd,
0, FALSE, DUPLICATE_SAME_ACCESS);
if (!ret) {
DWORD temp = GetLastError();
free(file->path);
free(file);
SetLastError(temp);
return SQFS_ERROR_IO;
}
CloseHandle(hnd);
file->flags = flags;
strm->append = file_append;
strm->flush = file_flush;
strm->get_filename = file_get_filename;
*out = strm;
return 0;
}
int ostream_open_file(sqfs_ostream_t **out, const char *path, int flags)
{
sqfs_file_handle_t hnd;
int ret;
*out = NULL;
ret = sqfs_open_native_file(&hnd, path, flags);
if (ret)
return ret;
ret = ostream_open_handle(out, path, hnd, flags);
if (ret) {
DWORD temp = GetLastError();
CloseHandle(hnd);
SetLastError(temp);
return SQFS_ERROR_IO;
}
return 0;
}
int ostream_open_stdout(sqfs_ostream_t **out)
{
HANDLE hnd = GetStdHandle(STD_OUTPUT_HANDLE);
return ostream_open_handle(out, "stdout", hnd,
SQFS_FILE_OPEN_NO_SPARSE);
}
|
