always properly check if SeekI() calls succeded; this makes CanRead() functions of...

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58080 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/common/anidecod.cpp b/src/common/anidecod.cpp
index 7c8dd53a99ebe1d81c792748585f4f4dfff0642e..bf5e22855af80a922feaa83757ac58abd95c02bd 100644 (file)
--- a/src/common/anidecod.cpp
+++ b/src/common/anidecod.cpp
@@ -127,7 +127,8 @@ bool wxANIDecoder::CanRead(wxInputStream& stream) const
     wxInt32 anih32;
     memcpy( &anih32, "anih", 4 );
 
-    stream.SeekI(0);
+    if ( stream.SeekI(0) == wxInvalidOffset )
+        return false;
     if ( !stream.Read(&FCC1, 4) )
         return false;
 
@@ -154,7 +155,8 @@ bool wxANIDecoder::CanRead(wxInputStream& stream) const
         }
         else
         {
-            stream.SeekI(stream.TellI() + datalen);
+            if ( stream.SeekI(stream.TellI() + datalen) == wxInvalidOffset )
+                return false;
         }
 
         // try to read next data chunk:
@@ -220,8 +222,10 @@ bool wxANIDecoder::Load( wxInputStream& stream )
     wxInt32 seq32;
     memcpy( &seq32, "seq ", 4 );
 
-    stream.SeekI(0);
-    stream.Read(&FCC1, 4);
+    if ( stream.SeekI(0) == wxInvalidOffset)
+        return false;
+    if ( !stream.Read(&FCC1, 4) )
+        return false;
     if ( FCC1 != riff32 )
         return false;
 
@@ -309,11 +313,13 @@ bool wxANIDecoder::Load( wxInputStream& stream )
         }
         else
         {
-            stream.SeekI(stream.TellI() + datalen);
+            if ( stream.SeekI(stream.TellI() + datalen) == wxInvalidOffset )
+                return false;
         }
 
         // try to read next data chunk:
-        stream.Read(&FCC1, 4);
+        if ( !stream.Read(&FCC1, 4) )
+            return false;
     }
 
     if (m_nFrames==0)

diff --git a/src/common/gifdecod.cpp b/src/common/gifdecod.cpp
index 9d8cc1dd71d9a7a1a8bf94ff5c56f9a917b81407..0a2dad27244465b6811980ccb722e872c247b656 100644 (file)
--- a/src/common/gifdecod.cpp
+++ b/src/common/gifdecod.cpp
@@ -580,7 +580,8 @@ bool wxGIFDecoder::CanRead(wxInputStream &stream) const
     if ( !stream.Read(buf, WXSIZEOF(buf)) )
         return false;
 
-    stream.SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent);
+    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;
 }
@@ -720,12 +721,12 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             {
                 while ((i = (unsigned char)stream.GetC()) != 0)
                 {
-                    if (stream.Eof() || (stream.LastRead() == 0))
+                    if (stream.Eof() || (stream.LastRead() == 0) ||
+                        stream.SeekI(i, wxFromCurrent) == wxInvalidOffset)
                     {
                         done = true;
                         break;
                     }
-                    stream.SeekI(i, wxFromCurrent);
                 }
             }
         }
@@ -834,12 +835,12 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             // skip all data
             while ((i = (unsigned char)stream.GetC()) != 0)
             {
-                if (stream.Eof() || (stream.LastRead() == 0))
+                if (stream.Eof() || (stream.LastRead() == 0) ||
+                    stream.SeekI(i, wxFromCurrent) == wxInvalidOffset)
                 {
                     Destroy();
                     return wxGIF_INVFORMAT;
                 }
-                stream.SeekI(i, wxFromCurrent);
             }
         }
         else if (type == 0x2C)
@@ -858,7 +859,11 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             {
                 unsigned int local_ncolors = 2 << (buf[8] & 0x07);
                 wxFileOffset numBytes = 3 * local_ncolors;
-                stream.SeekI(numBytes, wxFromCurrent);
+                if (stream.SeekI(numBytes, wxFromCurrent) == wxInvalidOffset)
+                {
+                    Destroy();
+                    return wxGIF_INVFORMAT;
+                }
             }
 
             // initial code size
@@ -872,12 +877,12 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             // skip all data
             while ((i = (unsigned char)stream.GetC()) != 0)
             {
-                if (stream.Eof() || (stream.LastRead() == 0))
+                if (stream.Eof() || (stream.LastRead() == 0) ||
+                    stream.SeekI(i, wxFromCurrent) == wxInvalidOffset)
                 {
                     Destroy();
                     return wxGIF_INVFORMAT;
                 }
-                stream.SeekI(i, wxFromCurrent);
             }
         }
         else if ((type != 0x3B) && (type != 00)) // testing

diff --git a/src/common/imagbmp.cpp b/src/common/imagbmp.cpp
index 72398fcda17cd73753b9f0e7f9019380bb2b1068..6f3a298d18eed65e66b51db3336e4f7512b5565f 100644 (file)
--- a/src/common/imagbmp.cpp
+++ b/src/common/imagbmp.cpp
@@ -640,7 +640,11 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
      * Reading the image data
      */
     if ( IsBmp )
-        stream.SeekI(bmpOffset); // else icon, just carry on
+    {
+        if (stream.SeekI(bmpOffset) == wxInvalidOffset)
+            return false;
+        //else: icon, just carry on
+    }
 
     unsigned char *data = ptr;
 
@@ -1255,7 +1259,8 @@ bool wxICOHandler::SaveFile(wxImage *image,
 bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream,
                             bool verbose, int index)
 {
-    stream.SeekI(0);
+    if (stream.SeekI(0) == wxInvalidOffset)
+        return false;
     return DoLoadFile(image, stream, verbose, index);
 }
 
@@ -1315,7 +1320,8 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
     {
         // seek to selected icon:
         pCurrentEntry = pIconDirEntry + iSel;
-        stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart);
+        if (stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart) == wxInvalidOffset)
+            return false;
         bResult = LoadDib(image, stream, true, IsBmp);
         bool bIsCursorType = (this->GetType() == wxBITMAP_TYPE_CUR) || (this->GetType() == wxBITMAP_TYPE_ANI);
         if ( bResult && bIsCursorType && nType == 2 )
@@ -1333,16 +1339,20 @@ int wxICOHandler::GetImageCount(wxInputStream& stream)
 {
     ICONDIR IconDir;
     wxFileOffset iPos = stream.TellI();
-    stream.SeekI(0);
-    stream.Read(&IconDir, sizeof(IconDir));
+    if (stream.SeekI(0) == wxInvalidOffset)
+        return 0;
+    if (stream.Read(&IconDir, sizeof(IconDir)).LastRead() != sizeof(IconDir))
+        return 0;
     wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
-    stream.SeekI(iPos);
+    if (stream.SeekI(iPos) == wxInvalidOffset)
+        return 0;
     return (int)nIcons;
 }
 
 bool wxICOHandler::DoCanRead(wxInputStream& stream)
 {
-    stream.SeekI(0);
+    if (stream.SeekI(0) == wxInvalidOffset)
+        return false;
     unsigned char hdr[4];
     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
         return false;
@@ -1364,7 +1374,8 @@ IMPLEMENT_DYNAMIC_CLASS(wxCURHandler, wxICOHandler)
 
 bool wxCURHandler::DoCanRead(wxInputStream& stream)
 {
-    stream.SeekI(0);
+    if (stream.SeekI(0) == wxInvalidOffset)
+        return false;
     unsigned char hdr[4];
     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
         return false;

diff --git a/src/common/imagiff.cpp b/src/common/imagiff.cpp
index 058d6e5cd0bb0e1409edb0d4e36cd30468e302c2..9fd15214d4adeeed246f67ad998720204256c314 100644 (file)
--- a/src/common/imagiff.cpp
+++ b/src/common/imagiff.cpp
@@ -234,7 +234,8 @@ bool wxIFFDecoder::CanRead()
     if ( !m_f->Read(buf, WXSIZEOF(buf)) )
         return false;
 
-    m_f->SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent);
+    if ( m_f->SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent) == wxInvalidOffset )
+        return false;
 
     return (memcmp(buf, "FORM", 4) == 0) && (memcmp(buf+8, "ILBM", 4) == 0);
 }
@@ -248,13 +249,13 @@ typedef unsigned char byte;
 #define IFFDEBUG 0
 
 /*************************************************************************
-  void decomprle(source, destination, source length, buffer size)
+void decomprle(source, destination, source length, buffer size)
 
-  Decompress run-length encoded data from source to destination. Terminates
-  when source is decoded completely or destination buffer is full.
+Decompress run-length encoded data from source to destination. Terminates
+when source is decoded completely or destination buffer is full.
 
-  The decruncher is as optimized as I could make it, without risking
-  safety in case of corrupt BODY chunks.
+The decruncher is as optimized as I could make it, without risking
+safety in case of corrupt BODY chunks.
 **************************************************************************/
 
 static void decomprle(const byte *sptr, byte *dptr, long slen, long dlen)
@@ -329,20 +330,27 @@ int wxIFFDecoder::ReadIFF()
 
     m_image = new IFFImage();
     if (m_image == 0) {
-    Destroy();
-    return wxIFF_MEMERR;
+        Destroy();
+        return wxIFF_MEMERR;
     }
 
     // compute file length
     wxFileOffset currentPos = m_f->TellI();
-    m_f->SeekI(0, wxFromEnd);
+    if (m_f->SeekI(0, wxFromEnd) == wxInvalidOffset) {
+        Destroy();
+        return wxIFF_MEMERR;
+    }
+
     long filesize = m_f->TellI();
-    m_f->SeekI(currentPos, wxFromStart);
+    if (m_f->SeekI(currentPos, wxFromStart) == wxInvalidOffset) {
+        Destroy();
+        return wxIFF_MEMERR;
+    }
 
     // allocate memory for complete file
     if ((databuf = new byte[filesize]) == 0) {
-    Destroy();
-    return wxIFF_MEMERR;
+        Destroy();
+        return wxIFF_MEMERR;
     }
 
     m_f->Read(databuf, filesize);
@@ -353,22 +361,22 @@ int wxIFFDecoder::ReadIFF()
 
     // check for minmal size
     if (dataptr + 12 > dataend) {
-    Destroy();
-    return wxIFF_INVFORMAT;
+        Destroy();
+        return wxIFF_INVFORMAT;
     }
 
     // check if we really got an IFF file
     if (strncmp((char *)dataptr, "FORM", 4) != 0) {
-    Destroy();
-    return wxIFF_INVFORMAT;
+        Destroy();
+        return wxIFF_INVFORMAT;
     }
 
     dataptr = dataptr + 8;                  // skip ID and length of FORM
 
     // check if the IFF file is an ILBM (picture) file
     if (strncmp((char *) dataptr, "ILBM", 4) != 0) {
-    Destroy();
-    return wxIFF_INVFORMAT;
+        Destroy();
+        return wxIFF_INVFORMAT;
     }
 
     wxLogTrace(_T("iff"), _T("IFF ILBM file recognized"));
@@ -388,7 +396,7 @@ int wxIFFDecoder::ReadIFF()
     // get chunk length and make even
     long chunkLen = (iff_getlong(dataptr + 4) + 1) & 0xfffffffe;
     if (chunkLen < 0) {     // format error?
-         break;
+        break;
     }
     bool truncated = (dataptr + 8 + chunkLen > dataend);
 
@@ -586,36 +594,36 @@ int wxIFFDecoder::ReadIFF()
                 int c = (col & 0x0f);
                 switch (col & 0x30) {
                 case 0x00: if (c >= 0 && c < colors) {
-                           rval = pal[3*c + 0];
-                           gval = pal[3*c + 1];
-                           bval = pal[3*c + 2];
-                       }
-                       break;
+                        rval = pal[3*c + 0];
+                        gval = pal[3*c + 1];
+                        bval = pal[3*c + 2];
+                    }
+                    break;
 
                 case 0x10: bval = c * 17;
-                       break;
+                    break;
 
                 case 0x20: rval = c * 17;
-                       break;
+                    break;
 
                 case 0x30: gval = c * 17;
-                       break;
+                    break;
                 }
             } else if (fmt == ILBM_HAM8) {
                 int c = (col & 0x3f);
                 switch(col & 0xc0) {
                 case 0x00: if (c >= 0 && c < colors) {
-                           rval = pal[3*c + 0];
-                           gval = pal[3*c + 1];
-                           bval = pal[3*c + 2];
-                       }
-                       break;
+                        rval = pal[3*c + 0];
+                        gval = pal[3*c + 1];
+                        bval = pal[3*c + 2];
+                    }
+                    break;
 
                 case 0x40: bval = (bval & 3) | (c << 2);
-                       break;
+                    break;
 
                 case 0x80: rval = (rval & 3) | (c << 2);
-                       break;
+                    break;
 
                 case 0xc0: gval = (rval & 3) | (c << 2);
                 }

diff --git a/src/common/imagtga.cpp b/src/common/imagtga.cpp
index fc7373822bb0090ac06b3751027ebeb3d70538d2..9fd65003a77f746bde9e7c32670edfb26c04537a 100644 (file)
--- a/src/common/imagtga.cpp
+++ b/src/common/imagtga.cpp
@@ -211,7 +211,8 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
     }
 
     // Seek from the offset we got from the TGA header.
-    stream.SeekI(offset, wxFromStart);
+    if (stream.SeekI(offset, wxFromStart) == wxInvalidOffset)
+        return wxTGA_INVFORMAT;
 
     // Load a palette if we have one.
     if (colorType == wxTGA_MAPPED)

diff --git a/src/common/xpmdecod.cpp b/src/common/xpmdecod.cpp
index 8d38a3132ef1ebb4bcbfca7c9b24d892fadd3ae4..54e54c5221e5aeabe90011754f6e19d01793b815 100644 (file)
--- a/src/common/xpmdecod.cpp
+++ b/src/common/xpmdecod.cpp
@@ -122,7 +122,8 @@ bool wxXPMDecoder::CanRead(wxInputStream& stream)
     if ( !stream.Read(buf, WXSIZEOF(buf)) )
         return false;
 
-    stream.SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent);
+    if (stream.SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent) == wxInvalidOffset)
+        return false;
 
     return memcmp(buf, "/* XPM */", WXSIZEOF(buf)) == 0;
 }

diff --git a/src/html/chm.cpp b/src/html/chm.cpp
index 5e14bcd55da6b747dc573481611b308bcb744823..584f7fb2cc58b9e6e88cb2a6f027e5c63910bcbd 100644 (file)
--- a/src/html/chm.cpp
+++ b/src/html/chm.cpp
@@ -487,15 +487,29 @@ size_t wxChmInputStream::OnSysRead(void *buffer, size_t bufsize)
     m_lasterror = wxSTREAM_NO_ERROR;
 
     // If the rest to read from the stream is less
-    // than the buffer size, than only read the rest
+    // than the buffer size, then only read the rest
     if ( m_pos + bufsize > m_size )
         bufsize = m_size - m_pos;
 
-    m_contentStream->SeekI(m_pos);
-    m_contentStream->Read(buffer, bufsize);
-    m_pos +=bufsize;
-    m_contentStream->SeekI(m_pos);
-    return bufsize;
+    if (m_contentStream->SeekI(m_pos) == wxInvalidOffset)
+    {
+        m_lasterror = wxSTREAM_EOF;
+        return 0;
+    }
+
+    size_t read = m_contentStream->Read(buffer, bufsize).LastRead();
+    m_pos += read;
+
+    if (m_contentStream->SeekI(m_pos) == wxInvalidOffset)
+    {
+        m_lasterror = wxSTREAM_READ_ERROR;
+        return 0;
+    }
+
+    if (read != bufsize)
+        m_lasterror = m_contentStream->GetLastError();
+
+    return read;
 }