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Add FindLength()

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42497 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Michael Wetherell
2006-10-27 08:54:00 +00:00
parent 6a305cfbc8
commit 1ab48408d1
2 changed files with 29 additions and 5 deletions
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28
src/common/fileback.cpp
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@@ -271,6 +271,29 @@ wxBackedInputStream::wxBackedInputStream(const wxBackingFile& backer)
{
}
wxFileOffset wxBackedInputStream::GetLength() const
{
return m_backer.m_impl->GetLength();
}
wxFileOffset wxBackedInputStream::FindLength() const
{
wxFileOffset len = GetLength();
if (len == wxInvalidOffset && IsOk()) {
// read a byte at 7ff...ffe
wxFileOffset pos = 1;
pos <<= sizeof(pos) * 8 - 1;
pos = ~pos - 1;
char ch;
size_t size = 1;
m_backer.m_impl->ReadAt(pos, &ch, &size);
len = GetLength();
}
return len;
}
size_t wxBackedInputStream::OnSysRead(void *buffer, size_t size)
{
if (!IsOk())
@@ -281,11 +304,6 @@ size_t wxBackedInputStream::OnSysRead(void *buffer, size_t size)
return size;
}
wxFileOffset wxBackedInputStream::GetLength() const
{
return m_backer.m_impl->GetLength();
}
wxFileOffset wxBackedInputStream::OnSysSeek(wxFileOffset pos, wxSeekMode mode)
{
switch (mode) {