X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/12811c1c3bf188b29188ede4e4320db9ff74b691..34eeb223b428c2e9ec90d88348e7e62dfeb1cb65:/src/common/fileback.cpp

diff --git a/src/common/fileback.cpp b/src/common/fileback.cpp
index a0cbc707d8..bc5f2ff9dd 100644
--- a/src/common/fileback.cpp
+++ b/src/common/fileback.cpp
@@ -83,7 +83,7 @@ wxBackingFileImpl::wxBackingFileImpl(wxInputStream *stream,
     wxFileOffset len = m_stream->GetLength();
 
     if (len >= 0 && len + size_t(1) < m_bufsize)
-        m_bufsize = len + 1;
+        m_bufsize = size_t(len + 1);
 
     if (m_bufsize)
         m_buf = new char[m_bufsize];
@@ -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) {