orc::Buffer *HdfsInputStream::read(uint64_t offset, uint64_t length, orc::Buffer *buffer)
{
if(!configured_) {
throw std::runtime_error("Need to configure first");
}
if (buffer == NULL) {
buffer = new HeapBuffer(length);
} else if (buffer->getLength() < length) {
delete buffer;
buffer = new HeapBuffer(length);
}
//blockreader::BlockPtr block = hdfsBlockReader_.getBlock(offset, length);
hdfsutils::HdfsBlockLocator locator;
base::ConfigurationMap conf;
conf["filename"] = url_;
conf["hdfsConfigurationFile"] = hdfsConfigurationFile_;
conf["fileStatCache"] = fileStatCache_;
locator.configure(conf);
BufferPtr block = locator.getBlock(offset, length);
if(block->size() != length) {
throw std::runtime_error("size mismatch");
}
// TODO get rid of this copy
memcpy(buffer->getStart(), block->data(), block->size());
return buffer;
}
// Read a file (may be text or binary).
inline BufferPtr read_binary(const std::string& filename,
const boost::uint64_t max_size = 0,
const unsigned int buffer_flags = 0)
{
std::ifstream ifs(filename.c_str(), std::ios::binary);
if (!ifs)
OPENVPN_THROW(open_file_error, "cannot open: " << filename);
// get length of file
ifs.seekg (0, std::ios::end);
const std::streamsize length = ifs.tellg();
if (max_size && boost::uint64_t(length) > max_size)
OPENVPN_THROW(file_too_large, "file too large [" << length << '/' << max_size << "]: " << filename);
ifs.seekg (0, std::ios::beg);
// allocate buffer
BufferPtr b = new BufferAllocated(size_t(length), buffer_flags | BufferAllocated::ARRAY);
// read data
ifs.read((char *)b->data(), length);
// check for errors
if (ifs.gcount() != length)
OPENVPN_THROW(open_file_error, "read length inconsistency: " << filename);
if (!ifs)
OPENVPN_THROW(open_file_error, "cannot read: " << filename);
return b;
}
void
VBOMesh::bufferSubData(GLuint theBufferID, BufferPtr theData, int theOffset,
int theNumberOfVertices, int theNumberOfCoords)
{
// std::cout << "vbo::bufferSubData" << std::endl;
// XXX ??? theData.flip();
// Bind The Buffer
glBindBuffer(GL_ARRAY_BUFFER, theBufferID);
// Load The Data
glBufferSubData(GL_ARRAY_BUFFER, theOffset,
theNumberOfVertices * theNumberOfCoords * sizeof(float), theData->data());
}
