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document that CanRead() and GetImageCount() functions of wxImageHandlers do NOT modify the current stream position and that they require seekable streams; rename current GetImageCount() functions to DoGetImageCount() and put save-and-restore stream position logic in GetImageCount(); add comments in the various DoCanRead() and in DoGetImageCount() where the stream position is modified; remove unneeded SeekI(0) calls from DoCanRead() and DoGetImageCount() functions: they didn't allow to load images from non-seekable streams; implement forward-seeking in wxInputStream::SeekI() also for non-seekable streams

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2009-06-01 11:43:36 +00:00
parent 1f51673bb8
commit 8faef7ccbc
25 changed files with 236 additions and 93 deletions
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5
src/common/gifdecod.cpp
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@@ -575,16 +575,13 @@ as an End of Information itself)
// CanRead:
// Returns true if the file looks like a valid GIF, false otherwise.
//
bool wxGIFDecoder::CanRead(wxInputStream &stream) const
bool wxGIFDecoder::DoCanRead(wxInputStream &stream) const
{
unsigned char buf[3];
if ( !stream.Read(buf, WXSIZEOF(buf)) )
return false;
if (stream.SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent) == wxInvalidOffset)
return false; // this happens e.g. for non-seekable streams
return memcmp(buf, "GIF", WXSIZEOF(buf)) == 0;
}