blob: 5cb41e45280e086947c0b51b8a41393ad71a3291 [file] [log] [blame] [edit]
// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <fcntl.h>
#include <fuchsia/io/llcpp/fidl.h>
#include <lib/fdio/io.h>
#include <lib/fdio/vfs.h>
#include <lib/zircon-internal/debug.h>
#include <lib/zx/handle.h>
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <zircon/assert.h>
#include <memory>
#include <type_traits>
#include <utility>
#include <fbl/string_buffer.h>
#include <fs/debug.h>
#include <fs/internal/fidl_transaction.h>
#include <fs/internal/remote_file_connection.h>
#include <fs/vfs_types.h>
#include <fs/vnode.h>
namespace fio = ::llcpp::fuchsia::io;
namespace fs {
namespace internal {
RemoteFileConnection::RemoteFileConnection(fs::Vfs* vfs, fbl::RefPtr<fs::Vnode> vnode,
VnodeProtocol protocol, VnodeConnectionOptions options)
: FileConnection(vfs, std::move(vnode), protocol, options) {}
void RemoteFileConnection::Read(uint64_t count, ReadCompleter::Sync& completer) {
FS_PRETTY_TRACE_DEBUG("[FileRead] options: ", options());
if (options().flags.node_reference) {
completer.Reply(ZX_ERR_BAD_HANDLE, fidl::VectorView<uint8_t>());
return;
}
if (!options().rights.read) {
completer.Reply(ZX_ERR_BAD_HANDLE, fidl::VectorView<uint8_t>());
return;
}
if (count > fio::MAX_BUF) {
completer.Reply(ZX_ERR_INVALID_ARGS, fidl::VectorView<uint8_t>());
return;
}
uint8_t data[fio::MAX_BUF];
size_t actual = 0;
zx_status_t status = vnode()->Read(data, count, offset_, &actual);
if (status == ZX_OK) {
ZX_DEBUG_ASSERT(actual <= count);
offset_ += actual;
}
completer.Reply(status, fidl::VectorView(fidl::unowned_ptr(data), actual));
}
void RemoteFileConnection::ReadAt(uint64_t count, uint64_t offset,
ReadAtCompleter::Sync& completer) {
FS_PRETTY_TRACE_DEBUG("[FileReadAt] options: ", options());
if (options().flags.node_reference) {
completer.Reply(ZX_ERR_BAD_HANDLE, fidl::VectorView<uint8_t>());
return;
}
if (!options().rights.read) {
completer.Reply(ZX_ERR_BAD_HANDLE, fidl::VectorView<uint8_t>());
return;
}
if (count > fio::MAX_BUF) {
completer.Reply(ZX_ERR_INVALID_ARGS, fidl::VectorView<uint8_t>());
return;
}
uint8_t data[fio::MAX_BUF];
size_t actual = 0;
zx_status_t status = vnode()->Read(data, count, offset, &actual);
if (status == ZX_OK) {
ZX_DEBUG_ASSERT(actual <= count);
}
completer.Reply(status, fidl::VectorView(fidl::unowned_ptr(data), actual));
}
void RemoteFileConnection::Write(fidl::VectorView<uint8_t> data, WriteCompleter::Sync& completer) {
FS_PRETTY_TRACE_DEBUG("[FileWrite] options: ", options());
if (options().flags.node_reference) {
completer.Reply(ZX_ERR_BAD_HANDLE, 0);
return;
}
if (!options().rights.write) {
completer.Reply(ZX_ERR_BAD_HANDLE, 0);
return;
}
size_t actual = 0u;
zx_status_t status;
if (options().flags.append) {
size_t end = 0u;
status = vnode()->Append(data.data(), data.count(), &end, &actual);
if (status == ZX_OK) {
offset_ = end;
}
} else {
status = vnode()->Write(data.data(), data.count(), offset_, &actual);
if (status == ZX_OK) {
offset_ += actual;
}
}
ZX_DEBUG_ASSERT(actual <= data.count());
completer.Reply(status, actual);
}
void RemoteFileConnection::WriteAt(fidl::VectorView<uint8_t> data, uint64_t offset,
WriteAtCompleter::Sync& completer) {
FS_PRETTY_TRACE_DEBUG("[FileWriteAt] options: ", options());
if (options().flags.node_reference) {
completer.Reply(ZX_ERR_BAD_HANDLE, 0);
return;
}
if (!options().rights.write) {
completer.Reply(ZX_ERR_BAD_HANDLE, 0);
return;
}
size_t actual = 0;
zx_status_t status = vnode()->Write(data.data(), data.count(), offset, &actual);
ZX_DEBUG_ASSERT(actual <= data.count());
completer.Reply(status, actual);
}
void RemoteFileConnection::Seek(int64_t offset, ::llcpp::fuchsia::io::SeekOrigin start,
SeekCompleter::Sync& completer) {
FS_PRETTY_TRACE_DEBUG("[FileSeek] options: ", options());
if (options().flags.node_reference) {
completer.Reply(ZX_ERR_BAD_HANDLE, offset_);
return;
}
fs::VnodeAttributes attr;
zx_status_t r;
if ((r = vnode()->GetAttributes(&attr)) < 0) {
return completer.Close(r);
}
size_t n;
switch (start) {
case fio::SeekOrigin::START:
if (offset < 0) {
completer.Reply(ZX_ERR_INVALID_ARGS, offset_);
return;
}
n = offset;
break;
case fio::SeekOrigin::CURRENT:
n = offset_ + offset;
if (offset < 0) {
// if negative seek
if (n > offset_) {
// wrapped around. attempt to seek before start
completer.Reply(ZX_ERR_INVALID_ARGS, offset_);
return;
}
} else {
// positive seek
if (n < offset_) {
// wrapped around. overflow
completer.Reply(ZX_ERR_INVALID_ARGS, offset_);
return;
}
}
break;
case fio::SeekOrigin::END:
n = attr.content_size + offset;
if (offset < 0) {
// if negative seek
if (n > attr.content_size) {
// wrapped around. attempt to seek before start
completer.Reply(ZX_ERR_INVALID_ARGS, offset_);
return;
}
} else {
// positive seek
if (n < attr.content_size) {
// wrapped around
completer.Reply(ZX_ERR_INVALID_ARGS, offset_);
return;
}
}
break;
default:
completer.Reply(ZX_ERR_INVALID_ARGS, offset_);
return;
}
offset_ = n;
completer.Reply(ZX_OK, offset_);
}
} // namespace internal
} // namespace fs