CoreGraphics dev

[wxWidgets.git] / src / tiff / tif_strip.c

diff --git a/src/tiff/tif_strip.c b/src/tiff/tif_strip.c
index 2321ad029e4295153fd595e92ee1a55fa6d0af7a..4c8378bd0b3bd7b8e44716d1eced01fefea4a6cc 100644 (file)
--- a/src/tiff/tif_strip.c
+++ b/src/tiff/tif_strip.c
@@ -31,6 +31,32 @@
  */
 #include "tiffiop.h"
 
+static uint32
+summarize(TIFF* tif, size_t summand1, size_t summand2, const char* where)
+{
+       uint32  bytes = summand1 + summand2;
+
+       if (bytes - summand1 != summand2) {
+               TIFFError(tif->tif_name, "Integer overflow in %s", where);
+               bytes = 0;
+       }
+
+       return (bytes);
+}
+
+static uint32
+multiply(TIFF* tif, size_t nmemb, size_t elem_size, const char* where)
+{
+       uint32  bytes = nmemb * elem_size;
+
+       if (elem_size && bytes / elem_size != nmemb) {
+               TIFFError(tif->tif_name, "Integer overflow in %s", where);
+               bytes = 0;
+       }
+
+       return (bytes);
+}
+
 /*
  * Compute which strip a (row,sample) value is in.
  */
@@ -66,7 +92,8 @@ TIFFNumberOfStrips(TIFF* tif)
             (td->td_imagelength != 0 ? 1 : 0) :
             TIFFhowmany(td->td_imagelength, td->td_rowsperstrip));
        if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
-               nstrips *= td->td_samplesperpixel;
+               nstrips = multiply(tif, nstrips, td->td_samplesperpixel,
+                                  "TIFFNumberOfStrips");
        return (nstrips);
 }
 
@@ -92,18 +119,48 @@ TIFFVStripSize(TIFF* tif, uint32 nrows)
                 * horizontal/vertical subsampling area include
                 * YCbCr data for the extended image.
                 */
-               tsize_t w =
-                   TIFFroundup(td->td_imagewidth, td->td_ycbcrsubsampling[0]);
-               tsize_t scanline = TIFFhowmany(w*td->td_bitspersample, 8);
-               tsize_t samplingarea =
-                   td->td_ycbcrsubsampling[0]*td->td_ycbcrsubsampling[1];
-               nrows = TIFFroundup(nrows, td->td_ycbcrsubsampling[1]);
+                uint16 ycbcrsubsampling[2];
+                tsize_t w, scanline, samplingarea;
+
+                TIFFGetField( tif, TIFFTAG_YCBCRSUBSAMPLING, 
+                              ycbcrsubsampling + 0, 
+                              ycbcrsubsampling + 1 );
+
+               w = TIFFroundup(td->td_imagewidth, ycbcrsubsampling[0]);
+               scanline = TIFFhowmany8(multiply(tif, w, td->td_bitspersample,
+                                                "TIFFVStripSize"));
+               samplingarea = ycbcrsubsampling[0]*ycbcrsubsampling[1];
+               nrows = TIFFroundup(nrows, ycbcrsubsampling[1]);
                /* NB: don't need TIFFhowmany here 'cuz everything is rounded */
+               scanline = multiply(tif, nrows, scanline, "TIFFVStripSize");
                return ((tsize_t)
-                   (nrows*scanline + 2*(nrows*scanline / samplingarea)));
+                   summarize(tif, scanline,
+                             multiply(tif, 2, scanline / samplingarea,
+                                      "TIFFVStripSize"), "TIFFVStripSize"));
        } else
 #endif
-               return ((tsize_t)(nrows * TIFFScanlineSize(tif)));
+               return ((tsize_t) multiply(tif, nrows, TIFFScanlineSize(tif),
+                                          "TIFFVStripSize"));
+}
+
+
+/*
+ * Compute the # bytes in a raw strip.
+ */
+tsize_t
+TIFFRawStripSize(TIFF* tif, tstrip_t strip)
+{
+       TIFFDirectory* td = &tif->tif_dir;
+       tsize_t bytecount = td->td_stripbytecount[strip];
+
+       if (bytecount <= 0) {
+               TIFFError(tif->tif_name,
+                         "%lu: Invalid strip byte count, strip %lu",
+                         (u_long) bytecount, (u_long) strip);
+               bytecount = (tsize_t) -1;
+       }
+
+       return bytecount;
 }
 
 /*
@@ -164,10 +221,12 @@ TIFFScanlineSize(TIFF* tif)
        TIFFDirectory *td = &tif->tif_dir;
        tsize_t scanline;
        
-       scanline = td->td_bitspersample * td->td_imagewidth;
+       scanline = multiply (tif, td->td_bitspersample, td->td_imagewidth,
+                            "TIFFScanlineSize");
        if (td->td_planarconfig == PLANARCONFIG_CONTIG)
-               scanline *= td->td_samplesperpixel;
-       return ((tsize_t) TIFFhowmany(scanline, 8));
+               scanline = multiply (tif, scanline, td->td_samplesperpixel,
+                                    "TIFFScanlineSize");
+       return ((tsize_t) TIFFhowmany8(scanline));
 }
 
 /*
@@ -182,11 +241,14 @@ TIFFRasterScanlineSize(TIFF* tif)
        TIFFDirectory *td = &tif->tif_dir;
        tsize_t scanline;
        
-       scanline = td->td_bitspersample * td->td_imagewidth;
+       scanline = multiply (tif, td->td_bitspersample, td->td_imagewidth,
+                            "TIFFRasterScanlineSize");
        if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
-               scanline *= td->td_samplesperpixel;
-               return ((tsize_t) TIFFhowmany(scanline, 8));
+               scanline = multiply (tif, scanline, td->td_samplesperpixel,
+                                    "TIFFRasterScanlineSize");
+               return ((tsize_t) TIFFhowmany8(scanline));
        } else
-               return ((tsize_t)
-                   TIFFhowmany(scanline, 8)*td->td_samplesperpixel);
+               return ((tsize_t) multiply (tif, TIFFhowmany8(scanline),
+                                           td->td_samplesperpixel,
+                                           "TIFFRasterScanlineSize"));
 }