size_t BufferedFile::get_bytes(address buffer, jint num, bool is_buffered) {
jint total_read = 0;
Buffer::Raw fb = data_buffer();
if (!is_buffered) {
OsFile_seek(file_pointer(), (long)(-(count() - index())), SEEK_CUR);
set_count(0); // flush buffer
set_index(0);
return OsFile_read(file_pointer(), buffer, 1, num);
} else {
while (!at_eof() && num > 0) {
int num_to_read = (num > (count() - index())) ? (count() - index()) :num;
// num_to_read may be zero
if (num_to_read) {
jvm_memcpy(buffer, fb().base_address() + (index() * sizeof (jbyte)),
num_to_read);
buffer += num_to_read;
num -= num_to_read;
set_index(index() + num_to_read);
total_read += num_to_read;
}
if (num > 0) {
refill_buffer();
}
}
}
return total_read;
}
void BufferedFile::refill_buffer() {
if (at_eof()) {
return;
}
int bytes_to_read = buffer_size();
int max = file_size() - file_pos();
if (bytes_to_read > max) {
bytes_to_read = max;
}
int count_read;
{
// The file_pointer() may be shared with a FileDecoder
// object. This may cause BufferedFile::file_pos() to become out
// of date. A call to OsFile_seek() makes everything consistent again.
AllocationDisabler raw_pointers_used_in_this_block;
Buffer::Raw fb = data_buffer();
OsFile_seek(file_pointer(), file_pos(), SEEK_SET);
count_read = OsFile_read(file_pointer(), fb().base_address(),
1, bytes_to_read);
}
set_count(count_read);
set_file_pos(long(file_pos() + count_read));
set_index(0);
if (count_read <= 0) {
set_at_eof(true);
}
return;
}
int FileDecoder::get_bytes_raw(address dest_address, int count) {
OsFile_Handle handle = file_handle();
GUARANTEE(handle != NULL, "What are we reading from?");
int pos = file_pos();
OsFile_seek(handle, pos, SEEK_SET);
int bytes_read = OsFile_read(handle, dest_address, 1, count);
set_file_pos(pos + bytes_read);
return bytes_read;
}
bool OsFile_readFile(const char *filePath, JVM_BYTE *buf, size_t bufSize)
{
if(filePath == NULL)
return false;
if(buf == NULL)
return false;
if(bufSize == 0)
return false;
JVM_FILE_HANDLE handle = OsFile_open(filePath, "rb");
if(handle == NULL)
return false;
size_t readSize = OsFile_read(handle, buf, bufSize);
OsFile_close(handle);
return readSize == bufSize;
}
