int JarFileParser::do_next_entries(const JvmPathChar* jar_file_name,
const char *suffix,
bool should_match,
JarFileParser::do_entry_proc f,
int entry_id, int max_size JVM_TRAPS)
{
GUARANTEE(entry_id >= 0 && max_size > 0, "Sanity");
int result = -1;
// JAR entry iteration is not compatible with CacheJarEntries. The
// easiest way make iteration co-exist with CacheJarEntries (especially
// in an MVM environment where other tasks may be loading class files
// at the same time) is to flush the JarFileParser caches before and after.
#if ENABLE_JAR_ENTRY_CACHE
// Make sure we don't have a JarFileParser that has entry caching enabled.
flush_caches();
#endif
{
UsingFastOops fast_oops;
JarFileParser::Fast parser = get(jar_file_name,
/*enable_entry_cache=*/false
JVM_NO_CHECK);
if (parser.not_null()) {
SuffixMatchFilterData data = { suffix, should_match, &parser, f };
result =
parser().filtered_do_next_entries(&JarFileParser::suffix_match_filter,
NULL, &data, entry_id, max_size
JVM_NO_CHECK);
}
}
#if ENABLE_JAR_ENTRY_CACHE
// Make sure we don't leave behind a JarFileParser that has entry caching
// disabled.
flush_caches();
#endif
return result;
}
extern "C" void
Jvm_read_jar_entry(const JvmPathChar* jar_file_name, const char* entry_name,
jobject entry) {
SETUP_ERROR_CHECKER_ARG;
UsingFastOops fast_oops;
JarFileParser::Fast parser = JarFileParser::get(jar_file_name JVM_NO_CHECK);
if (parser.not_null()) {
bool found = parser().find_entry(entry_name JVM_MUST_SUCCEED);
if (found) {
*(ReturnOop*)entry = parser().load_entry(JVM_SINGLE_ARG_NO_CHECK);
}
}
if (CURRENT_HAS_PENDING_EXCEPTION) {
*(ReturnOop*)entry = NULL;
Thread::clear_current_pending_exception();
}
// This file may not be in the classpath and the MIDP code may try to
// delete this file, so let's not keep it in cache. See CR 6357720.
//
// IMPL_NOTE: we should add an API to flush a specific cached JarFile.
JarFileParser::flush_caches();
}
// Create or retrieve a JarFileParser for the given JAR file.
// As a side effect, it might invalidate any previously obtained
// JarFileParser objects by closing their OsFile_handles.
ReturnOop JarFileParser::get(const JvmPathChar* jar_file_name1,
TypeArray * jar_file_name2,
bool enable_entry_cache JVM_TRAPS) {
GUARANTEE((jar_file_name1 != NULL && jar_file_name2 == NULL) ||
(jar_file_name1 == NULL && jar_file_name2 != NULL), "sanity");
UsingFastOops fast_oops;
JarFileParser::Fast parser = get_parser_from_cache(jar_file_name1,
jar_file_name2);
if (parser.not_null()) {
return parser;
}
if (jar_file_name1 && !OsFile_exists(jar_file_name1)) {
return NULL;
}
if (jar_file_name2 &&
!OsFile_exists((JvmPathChar *)jar_file_name2->byte_base_address())) {
return NULL;
}
parser = Universe::new_mixed_oop(MixedOopDesc::Type_JarFileParser,
JarFileParser::allocation_size(),
JarFileParser::pointer_count()
JVM_CHECK_0);
TypeArray::Fast stored_name;
if (jar_file_name1 != NULL) {
size_t name_bytes = (fn_strlen(jar_file_name1)+1) * sizeof(JvmPathChar);
stored_name = Universe::new_byte_array_raw(name_bytes JVM_CHECK_0);
JvmPathChar *data = (JvmPathChar *)stored_name().byte_base_address();
jvm_memcpy(data, jar_file_name1, name_bytes); // copy trailing NUL as well.
} else {
stored_name = jar_file_name2->obj();
}
BufferedFile::Fast bf = BufferedFile::allocate(JVM_SINGLE_ARG_CHECK_0);
FileDescriptor::Fast desc = FileDescriptor::allocate(JVM_SINGLE_ARG_CHECK_0);
OsFile_Handle fh = NULL;
for (int pass=0; pass<2; pass++) {
if (jar_file_name1) {
fh = OsFile_open(jar_file_name1, "rb");
} else {
fh = OsFile_open((JvmPathChar *)jar_file_name2->byte_base_address(),
"rb");
}
if (fh != NULL) {
break;
}
if (pass == 1 && fh == NULL) {
// The system is running low on OsFile_Handles. Make sure we flush
// the cache, and free all currently cached OsFile_Handles that belong
// to other JAR files.
flush_caches();
}
}
if (fh == NULL) {
return NULL;
}
desc().set_handle(fh);
bf().set_file_pointer(fh);
bf().set_file_size(fh == NULL ? 0 : OsFile_length(fh));
parser().set_file_descriptor(&desc);
parser().set_enable_entry_cache(enable_entry_cache);
parser().set_pathname(&stored_name);
parser().set_buffered_file(&bf);
parser().set_timestamp(++_timestamp);
if (!parser().find_end_of_central_header()) {
// The jar file is corrupted. Stop parsing it.
return NULL;
}
parser().save_parser_in_cache(JVM_SINGLE_ARG_MUST_SUCCEED);
return parser;
}
