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/*
* Copyright 2006 The Android Open Source Project
*
* Simple Zip archive support.
*/
#ifndef _MINZIP_ZIP
#define _MINZIP_ZIP
#include "inline_magic.h"
#include <stdlib.h>
#include <utime.h>
#include "Hash.h"
#include "SysUtil.h"
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#include <selinux/label.h>
#else
struct selabel_handle;
#endif
/*
* One entry in the Zip archive. Treat this as opaque -- use accessors below.
*
* TODO: we're now keeping the pages mapped so we don't have to copy the
* filename. We can change the accessors to retrieve the various pieces
* directly from the source file instead of copying them out, for a very
* slight speed hit and a modest reduction in memory usage.
*/
typedef struct ZipEntry {
unsigned int fileNameLen;
const char* fileName; // not null-terminated
long offset;
long compLen;
long uncompLen;
int compression;
long modTime;
long crc32;
int versionMadeBy;
long externalFileAttributes;
} ZipEntry;
/*
* One Zip archive. Treat as opaque.
*/
typedef struct ZipArchive {
int fd;
unsigned int numEntries;
ZipEntry* pEntries;
HashTable* pHash; // maps file name to ZipEntry
MemMapping map;
} ZipArchive;
/*
* Represents a non-NUL-terminated string,
* which is how entry names are stored.
*/
typedef struct {
const char *str;
size_t len;
} UnterminatedString;
/*
* Open a Zip archive.
*
* On success, returns 0 and populates "pArchive". Returns nonzero errno
* value on failure.
*/
int mzOpenZipArchive(const char* fileName, ZipArchive* pArchive);
/*
* Close archive, releasing resources associated with it.
*
* Depending on the implementation this could unmap pages used by classes
* stored in a Jar. This should only be done after unloading classes.
*/
void mzCloseZipArchive(ZipArchive* pArchive);
/*
* Find an entry in the Zip archive, by name.
*/
const ZipEntry* mzFindZipEntry(const ZipArchive* pArchive,
const char* entryName);
/*
* Get the number of entries in the Zip archive.
*/
INLINE unsigned int mzZipEntryCount(const ZipArchive* pArchive) {
return pArchive->numEntries;
}
/*
* Get an entry by index. Returns NULL if the index is out-of-bounds.
*/
INLINE const ZipEntry*
mzGetZipEntryAt(const ZipArchive* pArchive, unsigned int index)
{
if (index < pArchive->numEntries) {
return pArchive->pEntries + index;
}
return NULL;
}
/*
* Get the index number of an entry in the archive.
*/
INLINE unsigned int
mzGetZipEntryIndex(const ZipArchive *pArchive, const ZipEntry *pEntry) {
return pEntry - pArchive->pEntries;
}
/*
* Simple accessors.
*/
INLINE UnterminatedString mzGetZipEntryFileName(const ZipEntry* pEntry) {
UnterminatedString ret;
ret.str = pEntry->fileName;
ret.len = pEntry->fileNameLen;
return ret;
}
INLINE long mzGetZipEntryOffset(const ZipEntry* pEntry) {
return pEntry->offset;
}
INLINE long mzGetZipEntryUncompLen(const ZipEntry* pEntry) {
return pEntry->uncompLen;
}
INLINE long mzGetZipEntryModTime(const ZipEntry* pEntry) {
return pEntry->modTime;
}
INLINE long mzGetZipEntryCrc32(const ZipEntry* pEntry) {
return pEntry->crc32;
}
bool mzIsZipEntrySymlink(const ZipEntry* pEntry);
/*
* Type definition for the callback function used by
* mzProcessZipEntryContents().
*/
typedef bool (*ProcessZipEntryContentsFunction)(const unsigned char *data,
int dataLen, void *cookie);
/*
* Stream the uncompressed data through the supplied function,
* passing cookie to it each time it gets called. processFunction
* may be called more than once.
*
* If processFunction returns false, the operation is abandoned and
* mzProcessZipEntryContents() immediately returns false.
*
* This is useful for calculating the hash of an entry's uncompressed contents.
*/
bool mzProcessZipEntryContents(const ZipArchive *pArchive,
const ZipEntry *pEntry, ProcessZipEntryContentsFunction processFunction,
void *cookie);
/*
* Read an entry into a buffer allocated by the caller.
*/
bool mzReadZipEntry(const ZipArchive* pArchive, const ZipEntry* pEntry,
char* buf, int bufLen);
/*
* Check the CRC on this entry; return true if it is correct.
* May do other internal checks as well.
*/
bool mzIsZipEntryIntact(const ZipArchive *pArchive, const ZipEntry *pEntry);
/*
* Inflate and write an entry to a file.
*/
bool mzExtractZipEntryToFile(const ZipArchive *pArchive,
const ZipEntry *pEntry, int fd);
/*
* Inflate and write an entry to a memory buffer, which must be long
* enough to hold mzGetZipEntryUncomplen(pEntry) bytes.
*/
bool mzExtractZipEntryToBuffer(const ZipArchive *pArchive,
const ZipEntry *pEntry, unsigned char* buffer);
/*
* Inflate all entries under zipDir to the directory specified by
* targetDir, which must exist and be a writable directory.
*
* The immediate children of zipDir will become the immediate
* children of targetDir; e.g., if the archive contains the entries
*
* a/b/c/one
* a/b/c/two
* a/b/c/d/three
*
* and mzExtractRecursive(a, "a/b/c", "/tmp", ...) is called, the resulting
* files will be
*
* /tmp/one
* /tmp/two
* /tmp/d/three
*
* flags is zero or more of the following:
*
* MZ_EXTRACT_FILES_ONLY - only unpack files, not directories or symlinks
* MZ_EXTRACT_DRY_RUN - don't do anything, but do invoke the callback
*
* If timestamp is non-NULL, file timestamps will be set accordingly.
*
* If callback is non-NULL, it will be invoked with each unpacked file.
*
* Returns true on success, false on failure.
*/
enum { MZ_EXTRACT_FILES_ONLY = 1, MZ_EXTRACT_DRY_RUN = 2 };
bool mzExtractRecursive(const ZipArchive *pArchive,
const char *zipDir, const char *targetDir,
int flags, const struct utimbuf *timestamp,
void (*callback)(const char *fn, void*), void *cookie,
struct selabel_handle *sehnd);
#endif /*_MINZIP_ZIP*/
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