added the possibility to rescale the image during loading, especially useful with...

[wxWidgets.git] / src / common / sstream.cpp

diff --git a/src/common/sstream.cpp b/src/common/sstream.cpp
index 4228a8a19e31fd5d0966c98151eba29a4dda3864..740ebbf5519445c5e2b2e3590908f32d86f3602a 100644 (file)
--- a/src/common/sstream.cpp
+++ b/src/common/sstream.cpp
@@ -36,27 +36,22 @@
 // construction/destruction
 // ----------------------------------------------------------------------------
 
+// TODO:  Do we want to include the null char in the stream?  If so then
+// just add +1 to m_len in the ctor 
 wxStringInputStream::wxStringInputStream(const wxString& s)
 #if wxUSE_UNICODE
-    : m_str(s), m_buf(wxMBConvUTF8().cWX2MB(s).release()), m_len(strlen(m_buf))
+    // FIXME-UTF8: use wxCharBufferWithLength if we have it
+    : m_str(s), m_buf(s.utf8_str()), m_len(strlen(m_buf))
 #else
-    : m_str(s), m_buf((char*)s.c_str()), m_len(s.length())
+    : m_str(s), m_buf(s.mb_str()), m_len(s.length())
 #endif
 {
 #if wxUSE_UNICODE
-    wxASSERT_MSG(m_buf != NULL, _T("Could not convert string to UTF8!"));
+    wxASSERT_MSG(m_buf.data() != NULL, _T("Could not convert string to UTF8!"));
 #endif
     m_pos = 0;
 }
 
-wxStringInputStream::~wxStringInputStream()
-{
-#if wxUSE_UNICODE
-    // Note: wx[W]CharBuffer uses malloc()/free()
-    free(m_buf);
-#endif
-}
-
 // ----------------------------------------------------------------------------
 // getlength
 // ----------------------------------------------------------------------------
@@ -91,17 +86,18 @@ wxFileOffset wxStringInputStream::OnSysSeek(wxFileOffset ofs, wxSeekMode mode)
             return wxInvalidOffset;
     }
 
-    if ( ofs < 0 || wx_static_cast(size_t, ofs) >= m_len )
+    if ( ofs < 0 || ofs > static_cast<wxFileOffset>(m_len) )
         return wxInvalidOffset;
 
-    m_pos = wx_static_cast(size_t, ofs);
+    // FIXME: this can't be right
+    m_pos = wx_truncate_cast(size_t, ofs);
 
     return ofs;
 }
 
 wxFileOffset wxStringInputStream::OnSysTell() const
 {
-    return wx_static_cast(wxFileOffset, m_pos);
+    return static_cast<wxFileOffset>(m_pos);
 }
 
 // ----------------------------------------------------------------------------
@@ -123,7 +119,7 @@ size_t wxStringInputStream::OnSysRead(void *buffer, size_t size)
         size = sizeMax;
     }
 
-    memcpy(buffer, m_buf + m_pos, size);
+    memcpy(buffer, m_buf.data() + m_pos, size);
     m_pos += size;
 
     return size;
@@ -139,7 +135,7 @@ size_t wxStringInputStream::OnSysRead(void *buffer, size_t size)
 
 wxFileOffset wxStringOutputStream::OnSysTell() const
 {
-    return wx_static_cast(wxFileOffset, m_pos);
+    return static_cast<wxFileOffset>(m_pos);
 }
 
 // ----------------------------------------------------------------------------
@@ -148,15 +144,60 @@ wxFileOffset wxStringOutputStream::OnSysTell() const
 
 size_t wxStringOutputStream::OnSysWrite(const void *buffer, size_t size)
 {
-    const char *p = wx_static_cast(const char *, buffer);
+    const char *p = static_cast<const char *>(buffer);
+
+#if wxUSE_UNICODE_WCHAR
+    // the part of the string we have here may be incomplete, i.e. it can stop
+    // in the middle of an UTF-8 character and so converting it would fail; if
+    // this is the case, accumulate the part which we failed to convert until
+    // we get the rest (and also take into account the part which we might have
+    // left unconverted before)
+    const char *src;
+    size_t srcLen;
+    if ( m_unconv.GetDataLen() )
+    {
+        // append the new data to the data remaining since the last time
+        m_unconv.AppendData(p, size);
+        src = m_unconv;
+        srcLen = m_unconv.GetDataLen();
+    }
+    else // no unconverted data left, avoid extra copy
+    {
+        src = p;
+        srcLen = size;
+    }
 
-    // append the input buffer (may not be null terminated - thus 
-    // the literal length
-    m_str->Append(wxString(p, m_conv, size));
+    size_t wlen;
+    wxWCharBuffer wbuf(m_conv.cMB2WC(src, srcLen, &wlen));
+    if ( wbuf )
+    {
+        // conversion succeeded, clear the unconverted buffer
+        m_unconv = wxMemoryBuffer(0);
 
-    // return number of bytes actually written
+        m_str->append(wbuf, wlen);
+    }
+    else // conversion failed
+    {
+        // remember unconverted data if there had been none before (otherwise
+        // we've already got it in the buffer)
+        if ( src == p )
+            m_unconv.AppendData(src, srcLen);
+
+        // pretend that we wrote the data anyhow, otherwise the caller would
+        // believe there was an error and this might not be the case, but do
+        // not update m_pos as m_str hasn't changed
+        return size;
+    }
+#else // !wxUSE_UNICODE_WCHAR
+    // no recoding necessary, the data is supposed to already be in UTF-8 (if
+    // supported) or ASCII otherwise
+    m_str->append(p, size);
+#endif // wxUSE_UNICODE_WCHAR/!wxUSE_UNICODE_WCHAR
+
+    // update position
     m_pos += size;
 
+    // return number of bytes actually written
     return size;
 }