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/*
* Copyright (C) 2006 The Android Open Source Project
* This code has been modified. Portions copyright (C) 2010, T-Mobile USA, Inc.
*
* 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.
*/
//
// Provide access to read-only assets.
//
#define LOG_TAG "packageresmap"
#include <androidfw/PackageRedirectionMap.h>
#include <androidfw/ResourceTypes.h>
#include <utils/misc.h>
using namespace android;
PackageRedirectionMap::PackageRedirectionMap()
: mPackage(-1), mEntriesByType(NULL)
{
}
static void clearEntriesByType(uint32_t** entriesByType)
{
SharedBuffer* buf = SharedBuffer::bufferFromData(entriesByType);
const size_t N = buf->size() / sizeof(entriesByType[0]);
for (size_t i = 0; i < N; i++) {
uint32_t* entries = entriesByType[i];
if (entries != NULL) {
SharedBuffer::bufferFromData(entries)->release();
}
}
buf->release();
}
PackageRedirectionMap::~PackageRedirectionMap()
{
if (mEntriesByType != NULL) {
clearEntriesByType(mEntriesByType);
}
}
unsigned int roundUpPower2(unsigned int val)
{
val--;
val |= val >> 1;
val |= val >> 2;
val |= val >> 4;
val |= val >> 8;
val |= val >> 16;
val++;
return val;
}
static void* ensureCapacity(void* data, size_t nmemb, size_t size)
{
SharedBuffer* buf;
size_t currentSize;
if (data != NULL) {
buf = SharedBuffer::bufferFromData(data);
currentSize = buf->size();
} else {
buf = NULL;
currentSize = 0;
}
size_t minSize = nmemb * size;
if (minSize > currentSize) {
unsigned int requestSize = roundUpPower2(minSize);
if (buf == NULL) {
buf = SharedBuffer::alloc(requestSize);
} else {
buf = buf->editResize(requestSize);
}
memset((unsigned char*)buf->data()+currentSize, 0, requestSize - currentSize);
}
return buf->data();
}
bool PackageRedirectionMap::addRedirection(uint32_t fromIdent, uint32_t toIdent)
{
const int package = Res_GETPACKAGE(fromIdent);
const int type = Res_GETTYPE(fromIdent);
const int entry = Res_GETENTRY(fromIdent);
// The first time we add a redirection we can infer the package for all
// future redirections.
if (mPackage == -1) {
mPackage = package+1;
} else if (mPackage != (package+1)) {
ALOGW("cannot add redirection for conflicting package 0x%02x (expecting package 0x%02x)\n", package+1, mPackage);
return false;
}
mEntriesByType = (uint32_t**)ensureCapacity(mEntriesByType, type + 1, sizeof(uint32_t*));
uint32_t* entries = mEntriesByType[type];
entries = (uint32_t*)ensureCapacity(entries, entry + 1, sizeof(uint32_t));
entries[entry] = toIdent;
mEntriesByType[type] = entries;
return true;
}
uint32_t PackageRedirectionMap::lookupRedirection(uint32_t fromIdent)
{
if (mPackage == -1 || mEntriesByType == NULL || fromIdent == 0) {
return 0;
}
const int package = Res_GETPACKAGE(fromIdent);
const int type = Res_GETTYPE(fromIdent);
const int entry = Res_GETENTRY(fromIdent);
if (package+1 != mPackage) {
return 0;
}
size_t nTypes = getNumberOfTypes();
if (type < 0 || type >= nTypes) {
return 0;
}
uint32_t* entries = mEntriesByType[type];
if (entries == NULL) {
return 0;
}
size_t nEntries = getNumberOfEntries(type);
if (entry < 0 || entry >= nEntries) {
return 0;
}
return entries[entry];
}
int PackageRedirectionMap::getPackage()
{
return mPackage;
}
size_t PackageRedirectionMap::getNumberOfTypes()
{
if (mEntriesByType == NULL) {
return 0;
} else {
return SharedBuffer::bufferFromData(mEntriesByType)->size() /
sizeof(mEntriesByType[0]);
}
}
size_t PackageRedirectionMap::getNumberOfUsedTypes()
{
uint32_t** entriesByType = mEntriesByType;
size_t N = getNumberOfTypes();
size_t count = 0;
for (size_t i=0; i<N; i++) {
if (entriesByType[i] != NULL) {
count++;
}
}
return count;
}
size_t PackageRedirectionMap::getNumberOfEntries(int type)
{
uint32_t* entries = mEntriesByType[type];
if (entries == NULL) {
return 0;
} else {
return SharedBuffer::bufferFromData(entries)->size() /
sizeof(entries[0]);
}
}
size_t PackageRedirectionMap::getNumberOfUsedEntries(int type)
{
size_t N = getNumberOfEntries(type);
uint32_t* entries = mEntriesByType[type];
size_t count = 0;
for (size_t i=0; i<N; i++) {
if (entries[i] != 0) {
count++;
}
}
return count;
}
uint32_t PackageRedirectionMap::getEntry(int type, int entry)
{
uint32_t* entries = mEntriesByType[type];
return entries[entry];
}
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