113 lines
2.5 KiB
C++
113 lines
2.5 KiB
C++
/*
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* \brief Block interface for HTTP block driver
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* \author Sebastian Sumpf <sebastian.sumpf@genode-labs.com>
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* \author Stefan Kalkowski <stefan.kalkowski@genode-labs.com>
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* \date 2010-08-24
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*/
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/*
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* Copyright (C) 2010-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <cap_session/connection.h>
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#include <block/component.h>
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#include <os/config.h>
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/* local includes */
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#include "http.h"
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using namespace Genode;
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class Driver : public Block::Driver
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{
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private:
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size_t _block_size;
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Http _http;
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public:
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Driver(size_t block_size, char *uri)
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: _block_size(block_size), _http(uri) {}
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/*******************************
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** Block::Driver interface **
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*******************************/
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Genode::size_t block_size() { return _block_size; }
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Block::sector_t block_count() { return _http.file_size() / _block_size; }
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Block::Session::Operations ops()
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{
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Block::Session::Operations o;
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o.set_operation(Block::Packet_descriptor::READ);
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return o;
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}
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void read(Block::sector_t block_nr,
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Genode::size_t block_count,
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char *buffer,
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Block::Packet_descriptor &packet)
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{
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_http.cmd_get(block_nr * _block_size, block_count * _block_size,
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(addr_t)buffer);
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ack_packet(packet);
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}
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};
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class Factory : public Block::Driver_factory
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{
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private:
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char _uri[64];
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size_t _blk_sz;
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public:
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Factory() : _blk_sz(512)
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{
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try {
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config()->xml_node().attribute("uri").value(_uri, sizeof(_uri));
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config()->xml_node().attribute("block_size").value(&_blk_sz);
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}
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catch (...) { }
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PINF("Using file=%s as device with block size %zx.", _uri, _blk_sz);
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}
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Block::Driver *create() {
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return new (env()->heap()) Driver(_blk_sz, _uri); }
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void destroy(Block::Driver *driver) {
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Genode::destroy(env()->heap(), driver); }
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};
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struct Main
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{
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Server::Entrypoint &ep;
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struct Factory factory;
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Block::Root root;
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Main(Server::Entrypoint &ep)
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: ep(ep), root(ep, Genode::env()->heap(), factory) {
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Genode::env()->parent()->announce(ep.manage(root)); }
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};
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/************
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** Server **
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************/
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namespace Server {
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char const *name() { return "http_blk_ep"; }
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size_t stack_size() { return 2*1024*sizeof(long); }
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void construct(Entrypoint &ep) { static Main server(ep); }
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}
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