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fix incorrect buffer handling with pad files

This commit is contained in:
Arvid Norberg 2009-01-12 18:08:18 +00:00
parent b3999c8ac0
commit 2a19a52465
1 changed files with 25 additions and 4 deletions
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29
src/storage.cpp
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@ -370,7 +370,7 @@ namespace libtorrent
for (;;)
{
size += bufs->iov_len;
if (size >= bytes)
if (size > bytes)
{
((char*&)bufs->iov_base) += bufs->iov_len - (size - bytes);
bufs->iov_len = size - bytes;
@ -394,6 +394,21 @@ namespace libtorrent
std::memset(i->iov_base, 0, i->iov_len);
}
#ifdef TORRENT_DEBUG
int count_bufs(file::iovec_t const* bufs, int bytes)
{
int size = 0;
int count = 1;
if (bytes == 0) return 0;
for (file::iovec_t const* i = bufs;; ++i, ++count)
{
size += i->iov_len;
TORRENT_ASSERT(size <= bytes);
if (size >= bytes) return count;
}
}
#endif
class storage : public storage_interface, boost::noncopyable
{
public:
@ -1066,6 +1081,7 @@ ret:
file::iovec_t* tmp_bufs = TORRENT_ALLOCA(file::iovec_t, num_bufs);
file::iovec_t* current_buf = TORRENT_ALLOCA(file::iovec_t, num_bufs);
copy_bufs(bufs, size, current_buf);
TORRENT_ASSERT(count_bufs(current_buf, size) == num_bufs);
int read_bytes;
for (;left_to_read > 0; ++file_iter, left_to_read -= read_bytes
, buf_pos += read_bytes)
@ -1090,9 +1106,12 @@ ret:
if (file_iter->pad_file)
{
int num_tmp_bufs = copy_bufs(current_buf, file_iter->size, tmp_bufs);
int num_tmp_bufs = copy_bufs(current_buf, read_bytes, tmp_bufs);
TORRENT_ASSERT(count_bufs(tmp_bufs, read_bytes) == num_tmp_bufs);
TORRENT_ASSERT(num_tmp_bufs <= num_bufs);
clear_bufs(tmp_bufs, num_tmp_bufs);
advance_bufs(current_buf, file_iter->size);
advance_bufs(current_buf, read_bytes);
TORRENT_ASSERT(count_bufs(current_buf, left_to_read - read_bytes) <= num_bufs);
continue;
}
@ -1112,6 +1131,8 @@ ret:
}
int num_tmp_bufs = copy_bufs(current_buf, read_bytes, tmp_bufs);
TORRENT_ASSERT(count_bufs(tmp_bufs, read_bytes) == num_tmp_bufs);
TORRENT_ASSERT(num_tmp_bufs <= num_bufs);
int actual_read = int(in->readv(file_iter->file_base
+ file_offset, tmp_bufs, num_tmp_bufs, ec));
file_offset = 0;
@ -1124,7 +1145,7 @@ ret:
return -1;
}
advance_bufs(current_buf, actual_read);
TORRENT_ASSERT(count_bufs(current_buf, left_to_read - read_bytes) <= num_bufs);
}
return result;
}