jobject MOZ_JNICALL
Java_org_mozilla_gecko_mozglue_NativeZip__1getInputStream(JNIEnv *jenv, jobject jzip, jlong obj, jstring path)
{
Zip *zip = (Zip *)obj;
const char* str;
str = jenv->GetStringUTFChars(path, nullptr);
Zip::Stream stream;
bool res = zip->GetStream(str, &stream);
jenv->ReleaseStringUTFChars(path, str);
if (!res) {
return nullptr;
}
jobject buf = jenv->NewDirectByteBuffer(const_cast<void *>(stream.GetBuffer()), stream.GetSize());
if (!buf) {
JNI_Throw(jenv, "java/lang/RuntimeException", "Failed to create ByteBuffer");
return nullptr;
}
jclass nativeZip = jenv->GetObjectClass(jzip);
jmethodID method = jenv->GetMethodID(nativeZip, "createInputStream", "(Ljava/nio/ByteBuffer;I)Ljava/io/InputStream;");
// Since this function is only expected to be called from Java, it is safe
// to skip exception checking for the method call below, as long as no
// other Native -> Java call doesn't happen before returning to Java.
return jenv->CallObjectMethod(jzip, method, buf, (jint) stream.GetType());
}
static void
extractFile(const char * path, Zip::Stream &s)
{
uint32_t size = s.GetUncompressedSize();
struct stat status;
if (!stat(path, &status) &&
status.st_size == size &&
apk_mtime < status.st_mtime)
return;
int fd = open(path, O_CREAT | O_NOATIME | O_TRUNC | O_RDWR, S_IRWXU);
if (fd == -1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't open %s to decompress library", path);
return;
}
if (ftruncate(fd, size) == -1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't ftruncate %s to decompress library", path);
close(fd);
return;
}
void * buf = mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if (buf == (void *)-1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't mmap decompression buffer");
close(fd);
return;
}
z_stream strm = {
next_in: (Bytef *)s.GetBuffer(),
avail_in: s.GetSize(),
total_in: 0,
next_out: (Bytef *)buf,
avail_out: size,
total_out: 0
};
int ret;
ret = inflateInit2(&strm, -MAX_WBITS);
if (ret != Z_OK)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflateInit failed: %s", strm.msg);
if (inflate(&strm, Z_FINISH) != Z_STREAM_END)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflate failed: %s", strm.msg);
if (strm.total_out != size)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "extracted %d, expected %d!", strm.total_out, size);
ret = inflateEnd(&strm);
if (ret != Z_OK)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "inflateEnd failed: %s", strm.msg);
close(fd);
#ifdef ANDROID_ARM_LINKER
/* We just extracted data that is going to be executed in the future.
* We thus need to ensure Instruction and Data cache coherency. */
cacheflush((unsigned) buf, (unsigned) buf + size, 0);
#endif
munmap(buf, size);
}