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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Read-only access to Zip archives, with minimal heap allocation.
*
* This is similar to the more-complete ZipFile class, but no attempt
* has been made to make them interchangeable. This class operates under
* a very different set of assumptions and constraints.
*
* One such assumption is that if you're getting file descriptors for
* use with this class as a child of a fork() operation, you must be on
* a pread() to guarantee correct operation. This is because pread() can
* atomically read at a file offset without worrying about a lock around an
* lseek() + read() pair.
*/
#ifndef __LIBS_ZIPFILERO_H
#define __LIBS_ZIPFILERO_H
#include <utils/Compat.h>
#include <utils/Errors.h>
#include <utils/FileMap.h>
#include <utils/threads.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
typedef void* ZipArchiveHandle;
namespace android {
/*
* Trivial typedef to ensure that ZipEntryRO is not treated as a simple
* integer. We use NULL to indicate an invalid value.
*/
typedef void* ZipEntryRO;
/*
* Open a Zip archive for reading.
*
* Implemented as a thin wrapper over system/core/libziparchive.
*
* "open" and "find entry by name" are fast operations and use as little
* memory as possible.
*
* We also support fast iteration over all entries in the file (with a
* stable, but unspecified iteration order).
*
* NOTE: If this is used on file descriptors inherited from a fork() operation,
* you must be on a platform that implements pread() to guarantee correctness
* on the shared file descriptors.
*/
class ZipFileRO {
public:
/* Zip compression methods we support */
enum : uint16_t {
kCompressStored = 0,
kCompressDeflated = 8
};
/*
* Open an archive.
*/
static ZipFileRO* open(const char* zipFileName);
/*
* Find an entry, by name. Returns the entry identifier, or NULL if
* not found.
*/
ZipEntryRO findEntryByName(const char* entryName) const;
/*
* Start iterating over the list of entries in the zip file. Requires
* a matching call to endIteration with the same cookie.
*/
bool startIteration(void** cookie);
bool startIteration(void** cookie, const char* prefix, const char* suffix);
/**
* Return the next entry in iteration order, or NULL if there are no more
* entries in this archive.
*/
ZipEntryRO nextEntry(void* cookie);
void endIteration(void* cookie);
void releaseEntry(ZipEntryRO entry) const;
/*
* Return the #of entries in the Zip archive.
*/
int getNumEntries();
/*
* Copy the filename into the supplied buffer. Returns 0 on success,
* -1 if "entry" is invalid, or the filename length if it didn't fit. The
* length, and the returned string, include the null-termination.
*/
int getEntryFileName(ZipEntryRO entry, char* buffer, size_t bufLen) const;
/*
* Get the vital stats for an entry. Pass in NULL pointers for anything
* you don't need.
*
* "*pOffset" holds the Zip file offset of the entry's data.
*
* Returns "false" if "entry" is bogus or if the data in the Zip file
* appears to be bad.
*/
bool getEntryInfo(ZipEntryRO entry, uint16_t* pMethod, uint32_t* pUncompLen,
uint32_t* pCompLen, off64_t* pOffset, uint32_t* pModWhen,
uint32_t* pCrc32) const;
/*
* Create a new FileMap object that maps a subset of the archive. For
* an uncompressed entry this effectively provides a pointer to the
* actual data, for a compressed entry this provides the input buffer
* for inflate().
*/
FileMap* createEntryFileMap(ZipEntryRO entry) const;
/*
* Uncompress the data into a buffer. Depending on the compression
* format, this is either an "inflate" operation or a memcpy.
*
* Use "uncompLen" from getEntryInfo() to determine the required
* buffer size.
*
* Returns "true" on success.
*/
bool uncompressEntry(ZipEntryRO entry, void* buffer, size_t size) const;
/*
* Uncompress the data to an open file descriptor.
*/
bool uncompressEntry(ZipEntryRO entry, int fd) const;
~ZipFileRO();
private:
/* these are private and not defined */
ZipFileRO(const ZipFileRO& src);
ZipFileRO& operator=(const ZipFileRO& src);
ZipFileRO(ZipArchiveHandle handle, char* fileName) : mHandle(handle),
mFileName(fileName)
{
}
const ZipArchiveHandle mHandle;
char* mFileName;
};
}; // namespace android
#endif /*__LIBS_ZIPFILERO_H*/
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