1 /*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * System utilities.
5 */
6 #ifndef _MINZIP_SYSUTIL
7 #define _MINZIP_SYSUTIL
8
9 #include "inline_magic.h"
10
11 #include <sys/types.h>
12
13 /*
14 * Use this to keep track of mapped segments.
15 */
16 typedef struct MemMapping {
17 void* addr; /* start of data */
18 size_t length; /* length of data */
19
20 void* baseAddr; /* page-aligned base address */
21 size_t baseLength; /* length of mapping */
22 } MemMapping;
23
24 /* copy a map */
sysCopyMap(MemMapping * dst,const MemMapping * src)25 INLINE void sysCopyMap(MemMapping* dst, const MemMapping* src) {
26 *dst = *src;
27 }
28
29 /*
30 * Load a file into a new shared memory segment. All data from the current
31 * offset to the end of the file is pulled in.
32 *
33 * The segment is read-write, allowing VM fixups. (It should be modified
34 * to support .gz/.zip compressed data.)
35 *
36 * On success, "pMap" is filled in, and zero is returned.
37 */
38 int sysLoadFileInShmem(int fd, MemMapping* pMap);
39
40 /*
41 * Map a file (from fd's current offset) into a shared,
42 * read-only memory segment.
43 *
44 * On success, "pMap" is filled in, and zero is returned.
45 */
46 int sysMapFileInShmem(int fd, MemMapping* pMap);
47
48 /*
49 * Like sysMapFileInShmem, but on only part of a file.
50 */
51 int sysMapFileSegmentInShmem(int fd, off_t start, long length,
52 MemMapping* pMap);
53
54 /*
55 * Release the pages associated with a shared memory segment.
56 *
57 * This does not free "pMap"; it just releases the memory.
58 */
59 void sysReleaseShmem(MemMapping* pMap);
60
61 #endif /*_MINZIP_SYSUTIL*/
62