frameworks_base/cmds/idmap2/libidmap2/ResourceUtils.cpp

/*
 * Copyright (C) 2018 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.
 */

#include "idmap2/ResourceUtils.h"

#include <memory>
#include <string>

#include "androidfw/StringPiece.h"
#include "androidfw/Util.h"
#include "idmap2/Result.h"
#include "idmap2/XmlParser.h"
#include "idmap2/ZipFile.h"

using android::StringPiece16;
using android::idmap2::Result;
using android::idmap2::XmlParser;
using android::idmap2::ZipFile;
using android::util::Utf16ToUtf8;

namespace android::idmap2::utils {

Result<std::string> ResToTypeEntryName(const AssetManager2& am, uint32_t resid) {
  AssetManager2::ResourceName name;
  if (!am.GetResourceName(resid, &name)) {
    return Error("no resource 0x%08x in asset manager", resid);
  }
  std::string out;
  if (name.type != nullptr) {
    out.append(name.type, name.type_len);
  } else {
    out += Utf16ToUtf8(StringPiece16(name.type16, name.type_len));
  }
  out.append("/");
  if (name.entry != nullptr) {
    out.append(name.entry, name.entry_len);
  } else {
    out += Utf16ToUtf8(StringPiece16(name.entry16, name.entry_len));
  }
  return out;
}

Result<OverlayManifestInfo> ExtractOverlayManifestInfo(const std::string& path,
                                                       bool assert_overlay) {
  std::unique_ptr<const ZipFile> zip = ZipFile::Open(path);
  if (!zip) {
    return Error("failed to open %s as a zip file", path.c_str());
  }

  std::unique_ptr<const MemoryChunk> entry = zip->Uncompress("AndroidManifest.xml");
  if (!entry) {
    return Error("failed to uncompress AndroidManifest.xml from %s", path.c_str());
  }

  Result<std::unique_ptr<const XmlParser>> xml = XmlParser::Create(entry->buf, entry->size);
  if (!xml) {
    return Error("failed to parse AndroidManifest.xml from %s", path.c_str());
  }

  auto manifest_it = (*xml)->tree_iterator();
  if (manifest_it->event() != XmlParser::Event::START_TAG || manifest_it->name() != "manifest") {
    return Error("root element tag is not <manifest> in AndroidManifest.xml of %s", path.c_str());
  }

  auto overlay_it = std::find_if(manifest_it.begin(), manifest_it.end(), [](const auto& it) {
    return it.event() == XmlParser::Event::START_TAG && it.name() == "overlay";
  });

  OverlayManifestInfo info{};
  if (overlay_it == manifest_it.end()) {
    if (!assert_overlay) {
      return info;
    }
    return Error("<overlay> missing from AndroidManifest.xml of %s", path.c_str());
  }

  if (auto result_str = overlay_it->GetAttributeStringValue("targetPackage")) {
    info.target_package = *result_str;
  } else {
    return Error("android:targetPackage missing from <overlay> of %s: %s", path.c_str(),
                 result_str.GetErrorMessage().c_str());
  }

  if (auto result_str = overlay_it->GetAttributeStringValue("targetName")) {
    info.target_name = *result_str;
  }

  if (auto result_value = overlay_it->GetAttributeValue("resourcesMap")) {
    if ((*result_value).dataType == Res_value::TYPE_REFERENCE) {
      info.resource_mapping = (*result_value).data;
    } else {
      return Error("android:resourcesMap is not a reference in AndroidManifest.xml of %s",
                   path.c_str());
    }
  }

  if (auto result_value = overlay_it->GetAttributeValue("isStatic")) {
    if ((*result_value).dataType >= Res_value::TYPE_FIRST_INT &&
        (*result_value).dataType <= Res_value::TYPE_LAST_INT) {
      info.is_static = (*result_value).data != 0U;
    } else {
      return Error("android:isStatic is not a boolean in AndroidManifest.xml of %s", path.c_str());
    }
  }

  if (auto result_value = overlay_it->GetAttributeValue("priority")) {
    if ((*result_value).dataType >= Res_value::TYPE_FIRST_INT &&
        (*result_value).dataType <= Res_value::TYPE_LAST_INT) {
      info.priority = (*result_value).data;
    } else {
      return Error("android:priority is not an integer in AndroidManifest.xml of %s", path.c_str());
    }
  }

  if (auto result_str = overlay_it->GetAttributeStringValue("requiredSystemPropertyName")) {
    info.requiredSystemPropertyName = *result_str;
  }

   if (auto result_str = overlay_it->GetAttributeStringValue("requiredSystemPropertyValue")) {
    info.requiredSystemPropertyValue = *result_str;
  }

  return info;
}

}  // namespace android::idmap2::utils