108 lines
2.5 KiB
C++
108 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) 2010-2017 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 Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/attached_rom_dataspace.h>
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#include <base/log.h>
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#include <block/component.h>
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#include <libc/component.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(Heap &heap, Ram_allocator &ram,
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size_t block_size, ::String const &uri)
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: Block::Driver(ram),
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_block_size(block_size), _http(heap, uri) {}
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/*******************************
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** Block::Driver interface **
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*******************************/
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Block::Session::Info info() const override
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{
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return { .block_size = _block_size,
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.block_count = _http.file_size() / _block_size,
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.align_log2 = log2(_block_size),
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.writeable = false };
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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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Env &_env;
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Heap &_heap;
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Attached_rom_dataspace _config { _env, "config" };
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::String const _uri;
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size_t const _blk_sz;
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public:
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Factory(Env &env, Heap &heap)
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:
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_env(env), _heap(heap),
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_uri (_config.xml().attribute_value("uri", ::String())),
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_blk_sz(_config.xml().attribute_value("block_size", 512U))
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{
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log("Using file=", _uri, " as device with block size ",
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Hex(_blk_sz, Hex::OMIT_PREFIX), ".");
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}
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Block::Driver *create() {
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return new (&_heap) Driver(_heap, _env.ram(), _blk_sz, _uri); }
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void destroy(Block::Driver *driver) {
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Genode::destroy(&_heap, driver); }
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};
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struct Main
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{
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Env &env;
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Heap heap { env.ram(), env.rm() };
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Factory factory { env, heap };
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Block::Root root { env.ep(), heap, env.rm(), factory, true };
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Main(Env &env) : env(env) {
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env.parent().announce(env.ep().manage(root)); }
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};
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void Libc::Component::construct(Libc::Env &env) { static Main m(env); }
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