org.robolectric.res.android.Idmap Maven / Gradle / Ivy
package org.robolectric.res.android;
// transliterated from
// https://android.googlesource.com/platform/frameworks/base/+/android-9.0.0_r12/libs/androidfw/Idmap.cpp and
// https://android.googlesource.com/platform/frameworks/base/+/android-9.0.0_r12/libs/androidfw/include/androidfw/Idmap.h
import static org.robolectric.res.android.Util.ATRACE_CALL;
import static org.robolectric.res.android.Util.SIZEOF_CPTR;
import static org.robolectric.res.android.Util.SIZEOF_INT;
import static org.robolectric.res.android.Util.dtohl;
import static org.robolectric.res.android.Util.dtohs;
import static org.robolectric.res.android.Util.logError;
import java.util.HashMap;
import java.util.Map;
import org.robolectric.res.android.ResourceTypes.IdmapEntry_header;
import org.robolectric.res.android.ResourceTypes.Idmap_header;
// #define ATRACE_TAG ATRACE_TAG_RESOURCES
//
// #include "androidfw/Idmap.h"
//
// #include "android-base/logging.h"
// #include "android-base/stringprintf.h"
// #include "utils/ByteOrder.h"
// #include "utils/Trace.h"
//
// #ifdef _WIN32
// #ifdef ERROR
// #undef ERROR
// #endif
// #endif
//
// #include "androidfw/ResourceTypes.h"
//
// using ::android::base::StringPrintf;
//
// namespace android {
class Idmap {
static boolean is_valid_package_id(short id) {
return id != 0 && id <= 255;
}
static boolean is_valid_type_id(short id) {
// Type IDs and package IDs have the same constraints in the IDMAP.
return is_valid_package_id(id);
}
// Represents a loaded/parsed IDMAP for a Runtime Resource Overlay (RRO).
// An RRO and its target APK have different resource IDs assigned to their resources. Overlaying
// a resource is done by resource name. An IDMAP is a generated mapping between the resource IDs
// of the RRO and the target APK for each resource with the same name.
// A LoadedIdmap can be set alongside the overlay's LoadedArsc to allow the overlay ApkAssets to
// masquerade as the target ApkAssets resources.
static class LoadedIdmap {
Idmap_header header_ = null;
String overlay_apk_path_;
final Map type_map_ = new HashMap<>();
public LoadedIdmap(Idmap_header header_) {
this.header_ = header_;
}
// Performs a lookup of the expected entry ID for the given IDMAP entry header.
// Returns true if the mapping exists and fills `output_entry_id` with the result.
static boolean Lookup(
IdmapEntry_header header, int input_entry_id, final Ref output_entry_id) {
if (input_entry_id < dtohs(header.entry_id_offset)) {
// After applying the offset, the entry is not present.
return false;
}
input_entry_id -= dtohs(header.entry_id_offset);
if (input_entry_id >= dtohs(header.entry_count)) {
// The entry is not present.
return false;
}
int result = dtohl(header.entries[input_entry_id]);
if (result == 0xffffffff) {
return false;
}
output_entry_id.set(result);
return true;
}
static boolean is_word_aligned(int offset) {
return (offset & 0x03) == 0;
}
@SuppressWarnings("DoNotCallSuggester")
static boolean IsValidIdmapHeader(StringPiece data) {
throw new UnsupportedOperationException();
// if (!is_word_aligned(data.data())) {
// LOG(ERROR) << "Idmap header is not word aligned.";
// return false;
// }
//
// if (data.size() < sizeof(Idmap_header)) {
// LOG(ERROR) << "Idmap header is too small.";
// return false;
// }
//
// const Idmap_header* header = reinterpret_cast(data.data());
// if (dtohl(header->magic) != kIdmapMagic) {
// LOG(ERROR) << StringPrintf("Invalid Idmap file: bad magic value (was 0x%08x, expected
// 0x%08x)",
// dtohl(header->magic), kIdmapMagic);
// return false;
// }
//
// if (dtohl(header->version) != kIdmapCurrentVersion) {
// // We are strict about versions because files with this format are auto-generated and
// don't need
// // backwards compatibility.
// LOG(ERROR) << StringPrintf("Version mismatch in Idmap (was 0x%08x, expected 0x%08x)",
// dtohl(header->version), kIdmapCurrentVersion);
// return false;
// }
//
// if (!is_valid_package_id(dtohs(header->target_package_id))) {
// LOG(ERROR) << StringPrintf("Target package ID in Idmap is invalid: 0x%02x",
// dtohs(header->target_package_id));
// return false;
// }
//
// if (dtohs(header->type_count) > 255) {
// LOG(ERROR) << StringPrintf("Idmap has too many type mappings (was %d, max 255)",
// (int)dtohs(header->type_count));
// return false;
// }
// return true;
}
// LoadedIdmap::LoadedIdmap(const Idmap_header* header) : header_(header) {
// size_t length = strnlen(reinterpret_cast(header_->overlay_path),
// arraysize(header_->overlay_path));
// overlay_apk_path_.assign(reinterpret_cast(header_->overlay_path), length);
// }
// Loads an IDMAP from a chunk of memory. Returns nullptr if the IDMAP data was malformed.
LoadedIdmap Load(StringPiece idmap_data) {
ATRACE_CALL();
if (!IsValidIdmapHeader(idmap_data)) {
return emptyBraces();
}
// Idmap_header header = reinterpret_cast(idmap_data.data());
Idmap_header header = idmap_data.asIdmap_header();
// Can't use make_unique because LoadedImpl constructor is private.
LoadedIdmap loaded_idmap = new LoadedIdmap(header);
// const byte* data_ptr = reinterpret_cast(idmap_data.data()) + sizeof(*header);
StringPiece data_ptr =
new StringPiece(idmap_data.myBuf(), idmap_data.myOffset() + SIZEOF_CPTR);
// int data_size = idmap_data.size() - sizeof(*header);
int data_size = idmap_data.size() - SIZEOF_CPTR;
int type_maps_encountered = 0;
while (data_size >= IdmapEntry_header.SIZEOF) {
if (!is_word_aligned(data_ptr.myOffset())) {
logError("Type mapping in Idmap is not word aligned");
return emptyBraces();
}
// Validate the type IDs.
// IdmapEntry_header entry_header = reinterpret_cast(data_ptr);
IdmapEntry_header entry_header =
new IdmapEntry_header(data_ptr.myBuf(), data_ptr.myOffset());
if (!is_valid_type_id(dtohs(entry_header.target_type_id))
|| !is_valid_type_id(dtohs(entry_header.overlay_type_id))) {
logError(
String.format(
"Invalid type map (0x%02x -> 0x%02x)",
dtohs(entry_header.target_type_id), dtohs(entry_header.overlay_type_id)));
return emptyBraces();
}
// Make sure there is enough space for the entries declared in the header.
if ((data_size - SIZEOF_CPTR) / SIZEOF_INT < dtohs(entry_header.entry_count)) {
logError(
String.format(
"Idmap too small for the number of entries (%d)",
(int) dtohs(entry_header.entry_count)));
return emptyBraces();
}
// Only add a non-empty overlay.
if (dtohs(entry_header.entry_count) != 0) {
// loaded_idmap.type_map_[static_cast(dtohs(entry_header.overlay_type_id))] =
// entry_header;
loaded_idmap.type_map_.put((byte) dtohs(entry_header.overlay_type_id), entry_header);
}
// int entry_size_bytes =
// sizeof(*entry_header) + (dtohs(entry_header.entry_count) * SIZEOF_INT);
int entry_size_bytes = SIZEOF_CPTR + (dtohs(entry_header.entry_count) * SIZEOF_INT);
data_ptr = new StringPiece(data_ptr.myBuf(), data_ptr.myOffset() + entry_size_bytes);
data_size -= entry_size_bytes;
type_maps_encountered++;
}
// Verify that we parsed all the type maps.
if (type_maps_encountered != dtohs(header.type_count)) {
logError(
"Parsed "
+ type_maps_encountered
+ " type maps but expected "
+ (int) dtohs(header.type_count));
return emptyBraces();
}
// return std.move(loaded_idmap);
return loaded_idmap;
}
private LoadedIdmap emptyBraces() {
return new LoadedIdmap(null);
}
// Returns the package ID for which this overlay should apply.
int TargetPackageId() {
return dtohs(header_.target_package_id);
}
// Returns the path to the RRO (Runtime Resource Overlay) APK for which this IDMAP was
// generated.
String OverlayApkPath() {
return overlay_apk_path_;
}
// Returns the mapping of target entry ID to overlay entry ID for the given target type.
IdmapEntry_header GetEntryMapForType(byte type_id) {
// auto iter = type_map_.find(type_id);
// if (iter != type_map_.end()) {
// return iter.second;
// }
// return null;
return type_map_.get(type_id);
}
//
// } // namespace android
}
}
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