String8 getAttribute(const ResXMLTree& tree, const char* ns,
const char* attr, String8* outError)
{
ssize_t idx = tree.indexOfAttribute(ns, attr);
if (idx < 0) {
return String8();
}
Res_value value;
if (tree.getAttributeValue(idx, &value) != NO_ERROR) {
if (value.dataType != Res_value::TYPE_STRING) {
if (outError != NULL) *outError = "attribute is not a string value";
return String8();
}
}
size_t len;
const uint16_t* str = tree.getAttributeStringValue(idx, &len);
return str ? String8(str, len) : String8();
}
static bool getAppInfo(const String8& path, AppInfo& outInfo) {
memset(&outInfo, 0, sizeof(outInfo));
AssetManager assetManager;
int32_t cookie = 0;
if (!assetManager.addAssetPath(path, &cookie)) {
return false;
}
Asset* asset = assetManager.openNonAsset(cookie, "AndroidManifest.xml", Asset::ACCESS_BUFFER);
if (asset == NULL) {
return false;
}
ResXMLTree xml;
if (xml.setTo(asset->getBuffer(true), asset->getLength(), false) != NO_ERROR) {
delete asset;
return false;
}
const String16 kAndroidNamespace("http://schemas.android.com/apk/res/android");
const String16 kManifestTag("manifest");
const String16 kApplicationTag("application");
const String16 kUsesSdkTag("uses-sdk");
const String16 kVersionCodeAttr("versionCode");
const String16 kMultiArchAttr("multiArch");
const String16 kMinSdkVersionAttr("minSdkVersion");
ResXMLParser::event_code_t event;
while ((event = xml.next()) != ResXMLParser::BAD_DOCUMENT &&
event != ResXMLParser::END_DOCUMENT) {
if (event != ResXMLParser::START_TAG) {
continue;
}
size_t len;
const char16_t* name = xml.getElementName(&len);
String16 name16(name, len);
if (name16 == kManifestTag) {
ssize_t idx = xml.indexOfAttribute(
kAndroidNamespace.string(), kAndroidNamespace.size(),
kVersionCodeAttr.string(), kVersionCodeAttr.size());
if (idx >= 0) {
outInfo.versionCode = xml.getAttributeData(idx);
}
} else if (name16 == kApplicationTag) {
ssize_t idx = xml.indexOfAttribute(
kAndroidNamespace.string(), kAndroidNamespace.size(),
kMultiArchAttr.string(), kMultiArchAttr.size());
if (idx >= 0) {
outInfo.multiArch = xml.getAttributeData(idx) != 0;
}
} else if (name16 == kUsesSdkTag) {
ssize_t idx = xml.indexOfAttribute(
kAndroidNamespace.string(), kAndroidNamespace.size(),
kMinSdkVersionAttr.string(), kMinSdkVersionAttr.size());
if (idx >= 0) {
uint16_t type = xml.getAttributeDataType(idx);
if (type >= Res_value::TYPE_FIRST_INT && type <= Res_value::TYPE_LAST_INT) {
outInfo.minSdkVersion = xml.getAttributeData(idx);
} else if (type == Res_value::TYPE_STRING) {
String8 minSdk8(xml.getStrings().string8ObjectAt(idx));
char* endPtr;
int minSdk = strtol(minSdk8.string(), &endPtr, 10);
if (endPtr != minSdk8.string() + minSdk8.size()) {
fprintf(stderr, "warning: failed to parse android:minSdkVersion '%s'\n",
minSdk8.string());
} else {
outInfo.minSdkVersion = minSdk;
}
} else {
fprintf(stderr, "warning: unrecognized value for android:minSdkVersion.\n");
}
}
}
}
delete asset;
return true;
}