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This commit is contained in:
Arvid Norberg
2004-01-19 19:36:55 +00:00
parent eda50ceeb5
commit b9c3db8a07
14 changed files with 231 additions and 101 deletions
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198
src/file_win.cpp
View File

@@ -1,55 +1,117 @@
#include <windows.h>
#include "libtorrent/file.hpp"
/*
Copyright (c) 2003, Magnus Jonsson
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "libtorrent/file.hpp"
#include <sstream>
#include <windows.h>
#define DWORD_MAX 0xffffffffu
namespace libtorrent {
namespace
{
void throw_exception(const char* thrower)
{
char buffer[1024];
int err = GetLastError();
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, 0, err, 0, buffer, 0, 0);
std::stringstream s;
s << thrower << ": " << buffer;
throw libtorrent::file_error(s.str());
}
}
namespace libtorrent
{
struct file::impl : boost::noncopyable
{
enum open_flags { read_flag=1,
write_flag=2 };
enum seek_mode { seek_begin=FILE_BEGIN,
seek_from_here=FILE_CURRENT,
seek_end=FILE_END };
enum open_flags
{
read_flag = 1,
write_flag = 2
};
enum seek_mode
{
seek_begin = FILE_BEGIN,
seek_from_here = FILE_CURRENT,
seek_end = FILE_END
};
impl()
{
m_file_handle=INVALID_HANDLE_VALUE;
m_file_handle = INVALID_HANDLE_VALUE;
}
void open(const char *file_name, open_flags flags)
{
assert(file_name);
assert(flags&(read_flag|write_flag));
assert(flags & (read_flag | write_flag));
DWORD access_mask=0;
if (flags&read_flag)
access_mask|=GENERIC_READ;
if (flags&write_flag)
access_mask|=GENERIC_WRITE;
DWORD access_mask = 0;
if (flags & read_flag)
access_mask |= GENERIC_READ;
if (flags & write_flag)
access_mask |= GENERIC_WRITE;
assert(access_mask&(GENERIC_READ|GENERIC_WRITE));
assert(access_mask & (GENERIC_READ | GENERIC_WRITE));
HANDLE new_handle=CreateFile(file_name,access_mask,FILE_SHARE_READ,NULL,
OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
HANDLE new_handle = CreateFile(
file_name
, access_mask
, FILE_SHARE_READ
, NULL
, OPEN_ALWAYS
, FILE_ATTRIBUTE_NORMAL
, NULL);
if (new_handle==INVALID_HANDLE_VALUE)
if (new_handle == INVALID_HANDLE_VALUE)
{
throw file_error("could not open file");
std::stringstream s;
s << "couldn't open file '" << file_name << "'";
throw file_error(s.str());
}
// will only close old file if the open succeeded
close();
m_file_handle=new_handle;
m_file_handle = new_handle;
}
void close()
{
if (m_file_handle!=INVALID_HANDLE_VALUE)
if (m_file_handle != INVALID_HANDLE_VALUE)
{
CloseHandle(m_file_handle);
m_file_handle=INVALID_HANDLE_VALUE;
m_file_handle = INVALID_HANDLE_VALUE;
}
}
@@ -61,13 +123,20 @@ namespace libtorrent {
size_type write(const char* buffer, size_type num_bytes)
{
assert(buffer);
assert(num_bytes>0);
assert((DWORD)num_bytes==num_bytes);
DWORD bytes_written=0;
if (num_bytes!=0)
assert(num_bytes > 0);
assert((DWORD)num_bytes == num_bytes);
DWORD bytes_written = 0;
if (num_bytes != 0)
{
if (FALSE == WriteFile(m_file_handle,buffer,(DWORD)num_bytes,&bytes_written,NULL))
throw file_error("file::impl::write: couldn't write to file");
if (FALSE == WriteFile(
m_file_handle
, buffer
, (DWORD)num_bytes
, &bytes_written
, NULL))
{
throw_exception("file::write");
}
}
return bytes_written;
}
@@ -75,59 +144,84 @@ namespace libtorrent {
size_type read(char* buffer, size_type num_bytes)
{
assert(buffer);
assert(num_bytes>0);
assert((DWORD)num_bytes==num_bytes);
assert(num_bytes > 0);
assert((DWORD)num_bytes == num_bytes);
DWORD bytes_read=0;
if (num_bytes!=0)
DWORD bytes_read = 0;
if (num_bytes != 0)
{
if (FALSE == ReadFile(m_file_handle,buffer,(DWORD)num_bytes,&bytes_read,NULL))
throw file_error("file::impl::read: couldn't write to file");
if (FALSE == ReadFile(
m_file_handle
, buffer
, (DWORD)num_bytes
, &bytes_read
, NULL))
{
throw_exception("file::read");
}
}
return bytes_read;
}
void seek(size_type pos, seek_mode from_where)
{
assert(pos>=0);
assert(pos >= 0);
LARGE_INTEGER offs;
offs.QuadPart=pos;
offs.QuadPart = pos;
// FILE_CURRENT
// FILE_END
if (FALSE == SetFilePointerEx(m_file_handle,offs,&offs,from_where))
throw file_error("file::impl::seek: error");
if (FALSE == SetFilePointerEx(
m_file_handle
, offs
, &offs
, from_where))
{
throw_exception("file::seek");
}
}
size_type tell()
{
LARGE_INTEGER offs;
offs.QuadPart=0;
offs.QuadPart = 0;
// is there any other way to get offset?
if (FALSE == SetFilePointerEx(m_file_handle,offs,&offs,FILE_CURRENT))
throw file_error("file::impl::tell: error");
if (FALSE == SetFilePointerEx(
m_file_handle
, offs
, &offs
, FILE_CURRENT))
{
throw_exception("file::tell");
}
size_type pos=offs.QuadPart;
assert(pos>=0);
return pos;
}
/*
size_type size()
{
LARGE_INTEGER s;
if (FALSE == GetFileSizeEx(m_file_handle,&s))
throw file_error("file::impl::size: error");
if (FALSE == GetFileSizeEx(m_file_handle, &s))
{
throw_exception("file::size");
}
size_type size=s.QuadPart;
assert(size>=0);
size_type size = s.QuadPart;
assert(size >= 0);
return size;
}
*/
private:
HANDLE m_file_handle;
};
}
namespace libtorrent {
namespace libtorrent
{
const file::seek_mode file::begin(file::impl::seek_begin);
const file::seek_mode file::end(file::impl::seek_end);
@@ -151,7 +245,7 @@ namespace libtorrent {
void file::open(boost::filesystem::path const& p, open_mode m)
{
m_impl->open(p.native_file_string().c_str(),impl::open_flags(m.m_mask));
m_impl->open(p.native_file_string().c_str(), impl::open_flags(m.m_mask));
}
void file::close()
@@ -161,12 +255,12 @@ namespace libtorrent {
size_type file::write(const char* buffer, size_type num_bytes)
{
return m_impl->write(buffer,num_bytes);
return m_impl->write(buffer, num_bytes);
}
size_type file::read(char* buffer, size_type num_bytes)
{
return m_impl->read(buffer,num_bytes);
return m_impl->read(buffer, num_bytes);
}
void file::seek(size_type pos, seek_mode m)
@@ -178,4 +272,4 @@ namespace libtorrent {
{
return m_impl->tell();
}
}
}