1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "android/jni/mime_utils.h" 6 7 #include "android/jni/jni_utils.h" 8 9 // Accessors for the various JNI binding objects. 10 namespace { 11 12 static jclass get_class(JNIEnv* env) { 13 static jclass clazz = env->FindClass("libcore/net/MimeUtils"); 14 return clazz; 15 } 16 17 static jmethodID guess_mime_type_from_extension(JNIEnv* env) { 18 static jmethodID method = env->GetStaticMethodID(get_class(env), 19 "guessMimeTypeFromExtension", "(Ljava/lang/String;)Ljava/lang/String;"); 20 return method; 21 } 22 23 static jmethodID guess_extension_from_mime_type(JNIEnv* env) { 24 static jmethodID method = env->GetStaticMethodID(get_class(env), 25 "guessExtensionFromMimeType", "(Ljava/lang/String;)Ljava/lang/String;"); 26 return method; 27 } 28 29 } // namespace 30 31 namespace android { 32 33 bool MimeUtils::GuessMimeTypeFromExtension(const std::string& extension, 34 std::string* result) { 35 JNIEnv* env = jni::GetJNIEnv(); 36 jstring jExtension = env->NewStringUTF(extension.c_str()); 37 jobject jResult = env->CallStaticObjectMethod( 38 get_class(env), guess_mime_type_from_extension(env), jExtension); 39 env->DeleteLocalRef(jExtension); 40 if (jResult) { 41 *result = jni::JstringToStdString(env, static_cast<jstring>(jResult)); 42 env->DeleteLocalRef(jResult); 43 } 44 return jResult; 45 } 46 47 bool MimeUtils::GuessExtensionFromMimeType(const std::string& mimeType, 48 std::string* result) { 49 JNIEnv* env = jni::GetJNIEnv(); 50 jstring jMimeType = env->NewStringUTF(mimeType.c_str()); 51 jobject jResult = env->CallStaticObjectMethod( 52 get_class(env), guess_extension_from_mime_type(env), jMimeType); 53 env->DeleteLocalRef(jMimeType); 54 if (jResult) { 55 *result = jni::JstringToStdString(env, static_cast<jstring>(jResult)); 56 env->DeleteLocalRef(jResult); 57 } 58 return jResult; 59 } 60 61 } // namespace android 62 63
