blob: c94282827c66a5cad30b766a89f916f12c40f2d6 [file] [log] [blame]
Dees Troyb7ae0982013-09-10 20:47:35 +00001/*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Simple Zip archive support.
5 */
6#ifndef _MINZIP_ZIP
7#define _MINZIP_ZIP
8
9#include "inline_magic.h"
10
11#include <stdlib.h>
12#include <utime.h>
13
14#include "Hash.h"
15#include "SysUtil.h"
16
17#ifdef __cplusplus
18extern "C" {
19#endif
20
Dees Troyb7ae0982013-09-10 20:47:35 +000021#include <selinux/selinux.h>
22#include <selinux/label.h>
Dees Troyb7ae0982013-09-10 20:47:35 +000023
24/*
25 * One entry in the Zip archive. Treat this as opaque -- use accessors below.
26 *
27 * TODO: we're now keeping the pages mapped so we don't have to copy the
28 * filename. We can change the accessors to retrieve the various pieces
29 * directly from the source file instead of copying them out, for a very
30 * slight speed hit and a modest reduction in memory usage.
31 */
32typedef struct ZipEntry {
33 unsigned int fileNameLen;
34 const char* fileName; // not null-terminated
35 long offset;
36 long compLen;
37 long uncompLen;
38 int compression;
39 long modTime;
40 long crc32;
41 int versionMadeBy;
42 long externalFileAttributes;
43} ZipEntry;
44
45/*
46 * One Zip archive. Treat as opaque.
47 */
48typedef struct ZipArchive {
49 int fd;
50 unsigned int numEntries;
51 ZipEntry* pEntries;
52 HashTable* pHash; // maps file name to ZipEntry
53 MemMapping map;
54} ZipArchive;
55
56/*
57 * Represents a non-NUL-terminated string,
58 * which is how entry names are stored.
59 */
60typedef struct {
61 const char *str;
62 size_t len;
63} UnterminatedString;
64
65/*
66 * Open a Zip archive.
67 *
68 * On success, returns 0 and populates "pArchive". Returns nonzero errno
69 * value on failure.
70 */
71int mzOpenZipArchive(const char* fileName, ZipArchive* pArchive);
72
73/*
74 * Close archive, releasing resources associated with it.
75 *
76 * Depending on the implementation this could unmap pages used by classes
77 * stored in a Jar. This should only be done after unloading classes.
78 */
79void mzCloseZipArchive(ZipArchive* pArchive);
80
81
82/*
83 * Find an entry in the Zip archive, by name.
84 */
85const ZipEntry* mzFindZipEntry(const ZipArchive* pArchive,
86 const char* entryName);
87
88/*
89 * Get the number of entries in the Zip archive.
90 */
91INLINE unsigned int mzZipEntryCount(const ZipArchive* pArchive) {
92 return pArchive->numEntries;
93}
94
95/*
96 * Get an entry by index. Returns NULL if the index is out-of-bounds.
97 */
98INLINE const ZipEntry*
99mzGetZipEntryAt(const ZipArchive* pArchive, unsigned int index)
100{
101 if (index < pArchive->numEntries) {
102 return pArchive->pEntries + index;
103 }
104 return NULL;
105}
106
107/*
108 * Get the index number of an entry in the archive.
109 */
110INLINE unsigned int
111mzGetZipEntryIndex(const ZipArchive *pArchive, const ZipEntry *pEntry) {
112 return pEntry - pArchive->pEntries;
113}
114
115/*
116 * Simple accessors.
117 */
118INLINE UnterminatedString mzGetZipEntryFileName(const ZipEntry* pEntry) {
119 UnterminatedString ret;
120 ret.str = pEntry->fileName;
121 ret.len = pEntry->fileNameLen;
122 return ret;
123}
124INLINE long mzGetZipEntryOffset(const ZipEntry* pEntry) {
125 return pEntry->offset;
126}
127INLINE long mzGetZipEntryUncompLen(const ZipEntry* pEntry) {
128 return pEntry->uncompLen;
129}
130INLINE long mzGetZipEntryModTime(const ZipEntry* pEntry) {
131 return pEntry->modTime;
132}
133INLINE long mzGetZipEntryCrc32(const ZipEntry* pEntry) {
134 return pEntry->crc32;
135}
136bool mzIsZipEntrySymlink(const ZipEntry* pEntry);
137
138
139/*
140 * Type definition for the callback function used by
141 * mzProcessZipEntryContents().
142 */
143typedef bool (*ProcessZipEntryContentsFunction)(const unsigned char *data,
144 int dataLen, void *cookie);
145
146/*
147 * Stream the uncompressed data through the supplied function,
148 * passing cookie to it each time it gets called. processFunction
149 * may be called more than once.
150 *
151 * If processFunction returns false, the operation is abandoned and
152 * mzProcessZipEntryContents() immediately returns false.
153 *
154 * This is useful for calculating the hash of an entry's uncompressed contents.
155 */
156bool mzProcessZipEntryContents(const ZipArchive *pArchive,
157 const ZipEntry *pEntry, ProcessZipEntryContentsFunction processFunction,
158 void *cookie);
159
160/*
161 * Read an entry into a buffer allocated by the caller.
162 */
163bool mzReadZipEntry(const ZipArchive* pArchive, const ZipEntry* pEntry,
164 char* buf, int bufLen);
165
166/*
167 * Check the CRC on this entry; return true if it is correct.
168 * May do other internal checks as well.
169 */
170bool mzIsZipEntryIntact(const ZipArchive *pArchive, const ZipEntry *pEntry);
171
172/*
173 * Inflate and write an entry to a file.
174 */
175bool mzExtractZipEntryToFile(const ZipArchive *pArchive,
176 const ZipEntry *pEntry, int fd);
177
178/*
179 * Inflate and write an entry to a memory buffer, which must be long
180 * enough to hold mzGetZipEntryUncomplen(pEntry) bytes.
181 */
182bool mzExtractZipEntryToBuffer(const ZipArchive *pArchive,
183 const ZipEntry *pEntry, unsigned char* buffer);
184
185/*
186 * Inflate all entries under zipDir to the directory specified by
187 * targetDir, which must exist and be a writable directory.
188 *
189 * The immediate children of zipDir will become the immediate
190 * children of targetDir; e.g., if the archive contains the entries
191 *
192 * a/b/c/one
193 * a/b/c/two
194 * a/b/c/d/three
195 *
196 * and mzExtractRecursive(a, "a/b/c", "/tmp", ...) is called, the resulting
197 * files will be
198 *
199 * /tmp/one
200 * /tmp/two
201 * /tmp/d/three
202 *
203 * flags is zero or more of the following:
204 *
205 * MZ_EXTRACT_FILES_ONLY - only unpack files, not directories or symlinks
206 * MZ_EXTRACT_DRY_RUN - don't do anything, but do invoke the callback
207 *
208 * If timestamp is non-NULL, file timestamps will be set accordingly.
209 *
210 * If callback is non-NULL, it will be invoked with each unpacked file.
211 *
212 * Returns true on success, false on failure.
213 */
214enum { MZ_EXTRACT_FILES_ONLY = 1, MZ_EXTRACT_DRY_RUN = 2 };
215bool mzExtractRecursive(const ZipArchive *pArchive,
216 const char *zipDir, const char *targetDir,
217 int flags, const struct utimbuf *timestamp,
218 void (*callback)(const char *fn, void*), void *cookie,
219 struct selabel_handle *sehnd);
220
221#ifdef __cplusplus
222}
223#endif
224
225#endif /*_MINZIP_ZIP*/