blob: af3d9b3bd71665bf11bf0037c401911e0fe4aaa6 [file] [log] [blame]
/*
* 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.
//
#define LOG_TAG "zipro"
//#define LOG_NDEBUG 0
#include <androidfw/ZipFileRO.h>
#include <utils/Log.h>
#include <utils/Compat.h>
#include <utils/misc.h>
#include <utils/threads.h>
#include <ziparchive/zip_archive.h>
#include <zlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <assert.h>
#include <unistd.h>
using namespace android;
class _ZipEntryRO {
public:
ZipEntry entry;
ZipEntryName name;
void *cookie;
_ZipEntryRO() : cookie(NULL) {}
~_ZipEntryRO() {
EndIteration(cookie);
}
private:
_ZipEntryRO(const _ZipEntryRO& other);
_ZipEntryRO& operator=(const _ZipEntryRO& other);
};
ZipFileRO::~ZipFileRO() {
CloseArchive(mHandle);
free(mFileName);
}
/*
* Open the specified file read-only. We memory-map the entire thing and
* close the file before returning.
*/
/* static */ ZipFileRO* ZipFileRO::open(const char* zipFileName)
{
ZipArchiveHandle handle;
const int32_t error = OpenArchive(zipFileName, &handle);
if (error) {
ALOGW("Error opening archive %s: %s", zipFileName, ErrorCodeString(error));
return NULL;
}
return new ZipFileRO(handle, strdup(zipFileName));
}
ZipEntryRO ZipFileRO::findEntryByName(const char* entryName) const
{
_ZipEntryRO* data = new _ZipEntryRO;
data->name = ZipEntryName(entryName);
const int32_t error = FindEntry(mHandle, data->name, &(data->entry));
if (error) {
delete data;
return NULL;
}
return (ZipEntryRO) data;
}
/*
* Get the useful fields from the zip entry.
*
* Returns "false" if the offsets to the fields or the contents of the fields
* appear to be bogus.
*/
bool ZipFileRO::getEntryInfo(ZipEntryRO entry, int* pMethod, size_t* pUncompLen,
size_t* pCompLen, off64_t* pOffset, long* pModWhen, long* pCrc32) const
{
const _ZipEntryRO* zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
const ZipEntry& ze = zipEntry->entry;
if (pMethod != NULL) {
*pMethod = ze.method;
}
if (pUncompLen != NULL) {
*pUncompLen = ze.uncompressed_length;
}
if (pCompLen != NULL) {
*pCompLen = ze.compressed_length;
}
if (pOffset != NULL) {
*pOffset = ze.offset;
}
if (pModWhen != NULL) {
*pModWhen = ze.mod_time;
}
if (pCrc32 != NULL) {
*pCrc32 = ze.crc32;
}
return true;
}
bool ZipFileRO::startIteration(void** cookie)
{
_ZipEntryRO* ze = new _ZipEntryRO;
int32_t error = StartIteration(mHandle, &(ze->cookie), NULL /* prefix */);
if (error) {
ALOGW("Could not start iteration over %s: %s", mFileName, ErrorCodeString(error));
delete ze;
return false;
}
*cookie = ze;
return true;
}
ZipEntryRO ZipFileRO::nextEntry(void* cookie)
{
_ZipEntryRO* ze = reinterpret_cast<_ZipEntryRO*>(cookie);
int32_t error = Next(ze->cookie, &(ze->entry), &(ze->name));
if (error) {
if (error != -1) {
ALOGW("Error iteration over %s: %s", mFileName, ErrorCodeString(error));
}
return NULL;
}
return &(ze->entry);
}
void ZipFileRO::endIteration(void* cookie)
{
delete reinterpret_cast<_ZipEntryRO*>(cookie);
}
void ZipFileRO::releaseEntry(ZipEntryRO entry) const
{
delete reinterpret_cast<_ZipEntryRO*>(entry);
}
/*
* Copy the entry's filename to the buffer.
*/
int ZipFileRO::getEntryFileName(ZipEntryRO entry, char* buffer, int bufLen)
const
{
const _ZipEntryRO* zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
const uint16_t requiredSize = zipEntry->name.name_length + 1;
if (bufLen < requiredSize) {
ALOGW("Buffer too short, requires %d bytes for entry name", requiredSize);
return requiredSize;
}
memcpy(buffer, zipEntry->name.name, requiredSize - 1);
buffer[requiredSize - 1] = '\0';
return 0;
}
/*
* Create a new FileMap object that spans the data in "entry".
*/
FileMap* ZipFileRO::createEntryFileMap(ZipEntryRO entry) const
{
const _ZipEntryRO *zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
const ZipEntry& ze = zipEntry->entry;
int fd = GetFileDescriptor(mHandle);
size_t actualLen = 0;
if (ze.method == kCompressStored) {
actualLen = ze.uncompressed_length;
} else {
actualLen = ze.compressed_length;
}
FileMap* newMap = new FileMap();
if (!newMap->create(mFileName, fd, ze.offset, actualLen, true)) {
delete newMap;
return NULL;
}
return newMap;
}
/*
* Uncompress an entry, in its entirety, into the provided output buffer.
*
* This doesn't verify the data's CRC, which might be useful for
* uncompressed data. The caller should be able to manage it.
*/
bool ZipFileRO::uncompressEntry(ZipEntryRO entry, void* buffer, size_t size) const
{
_ZipEntryRO *zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
const int32_t error = ExtractToMemory(mHandle, &(zipEntry->entry),
(uint8_t*) buffer, size);
if (error) {
ALOGW("ExtractToMemory failed with %s", ErrorCodeString(error));
return false;
}
return true;
}
/*
* Uncompress an entry, in its entirety, to an open file descriptor.
*
* This doesn't verify the data's CRC, but probably should.
*/
bool ZipFileRO::uncompressEntry(ZipEntryRO entry, int fd) const
{
_ZipEntryRO *zipEntry = reinterpret_cast<_ZipEntryRO*>(entry);
const int32_t error = ExtractEntryToFile(mHandle, &(zipEntry->entry), fd);
if (error) {
ALOGW("ExtractToMemory failed with %s", ErrorCodeString(error));
return false;
}
return true;
}