jint ByteChannel::read(jobject destination)
{
const ByteBuffer::ClassImpl& bufimpl = ByteBuffer::impl(m_env);
const jint remaining = get_remaining(m_env, destination,
bufimpl.m_mid_get_remaining);
if (!remaining)
{
// No space in the buffer; don't try to read anything.
return 0;
}
const jint position = get_position(m_env, destination,
bufimpl.m_mid_get_position);
jint bytes_read = 0;
void* data = m_env.GetDirectBufferAddress(destination);
if (data)
{
data = static_cast<char*>(data) + position;
bytes_read = m_reader(m_env, data, remaining);
}
else
{
// It was not a direct buffer ... see if it has an array.
jbyteArray raw_array = get_array(m_env, destination,
bufimpl.m_mid_has_array,
bufimpl.m_mid_get_array);
if (raw_array)
{
const jint array_offset = get_array_offset(
m_env, destination,
bufimpl.m_mid_get_array_offset);
ByteArray array(m_env, raw_array);
ByteArray::MutableContents contents(array);
data = contents.data();
data = static_cast<char*>(data) + position + array_offset;
bytes_read = m_reader(m_env, data, remaining);
}
}
if (data)
{
if (bytes_read > 0)
set_position(m_env, destination,
bufimpl.m_mid_set_position,
position + bytes_read);
return bytes_read;
}
// No accessible array, either. Oh well. Create a byte array and
// push it into the buffer.
ByteArray array(m_env, remaining);
ByteArray::MutableContents contents(array);
bytes_read = m_reader(m_env, contents.data(), contents.length());
if (bytes_read > 0)
put_bytearray(m_env, destination,
bufimpl.m_mid_put_bytearray,
array, bytes_read);
return bytes_read;
}
jint ByteChannel::write(jobject source)
{
const ByteBuffer::ClassImpl& bufimpl = ByteBuffer::impl(m_env);
const jint remaining = get_remaining(m_env, source,
bufimpl.m_mid_get_remaining);
if (!remaining)
{
// No data in the buffer; don't try to write anything.
return 0;
}
const jint position = get_position(m_env, source,
bufimpl.m_mid_get_position);
jint bytes_written = 0;
const void* data = m_env.GetDirectBufferAddress(source);
if (data)
{
data = static_cast<const char*>(data) + position;
bytes_written = m_writer(m_env, data, remaining);
}
else
{
// It was not a direct buffer ... see if it has an array.
jbyteArray raw_array = get_array(m_env, source,
bufimpl.m_mid_has_array,
bufimpl.m_mid_get_array);
if (raw_array)
{
const jint array_offset = get_array_offset(
m_env, source,
bufimpl.m_mid_get_array_offset);
const ByteArray array(m_env, raw_array);
ByteArray::Contents contents(array);
data = contents.data();
data = static_cast<const char*>(data) + position + array_offset;
bytes_written = m_writer(m_env, data, remaining);
}
}
if (data)
{
if (bytes_written > 0)
set_position(m_env, source,
bufimpl.m_mid_set_position,
position + bytes_written);
return bytes_written;
}
// No accessible array, either. Oh well. Get an array from the
// buffer and read data from that.
ByteArray array(m_env, remaining);
get_bytearray(m_env, source,
bufimpl.m_mid_get_bytearray,
array);
ByteArray::Contents contents(array);
bytes_written = m_writer(m_env, contents.data(), contents.length());
return bytes_written;
}
bool data_stream::read_array(std::vector<uint8>& buf)
{
if (get_remaining() > 1024U*1024U*1024U)
return false;
uint32 bytes_to_read = static_cast<uint32>(get_remaining());
if (!bytes_to_read)
{
buf.resize(0);
return true;
}
if (buf.size() < bytes_to_read)
buf.resize(bytes_to_read);
return read(&buf[0], bytes_to_read) == bytes_to_read;
}
bool data_stream::read_array(vector<uint8>& buf)
{
if (buf.size() < get_remaining())
{
if (get_remaining() > 1024U*1024U*1024U)
return false;
buf.resize((uint)get_remaining());
}
if (!get_remaining())
{
buf.resize(0);
return true;
}
return read(&buf[0], buf.size()) == buf.size();
}
int DXBC_Reader::get_int32()
{
if (get_remaining() < 4)
throw Exception("Unknown DXBC format");
int value = *(read_ptr++);
value |= *(read_ptr++) << 8;
value |= *(read_ptr++) << 16;
value |= *(read_ptr++) << 24;
return value;
}
bool data_stream::read_array(vector<uint8> &buf)
{
if (buf.size() < get_remaining())
{
//if (get_remaining() > 1024U*1024U*1024U)
if (get_remaining() > static_cast<uint64_t>(cINT32_MAX))
return false;
if (!buf.try_resize(static_cast<uint>(get_remaining())))
return false;
}
if (!get_remaining())
{
buf.resize(0);
return true;
}
return read(&buf[0], buf.size()) == buf.size();
}
const char * DXBC_Reader::get_string(int offset)
{
if ((offset < 0) || (offset > get_remaining()))
throw Exception("Unknown DXBC format");
const char *str_ptr = (const char *) read_ptr;
str_ptr += offset;
// Validate string .. check for end NUL
const unsigned char *check_ptr = (const unsigned char *) str_ptr;
while(*check_ptr)
{
check_ptr++;
if (check_ptr >= end_ptr)
throw Exception("Unknown DXBC format");
}
return str_ptr;
}
void DXBC_Reader::skip_bytes(int size)
{
if (get_remaining() < size)
throw Exception("Unknown DXBC format");
read_ptr+=size;
}
