Fix SPARC memory alignment issues in Pack/Unpack functions

python-pillow · May 20, 2019 · e073f4a · e073f4a
1 parent 3368500
commit e073f4a
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Showing 2 changed files with 43 additions and 0 deletions.
diff --git a/src/libImaging/Pack.c b/src/libImaging/Pack.c
@@ -251,6 +251,15 @@ ImagingPackRGB(UINT8* out, const UINT8* in, int pixels)
 {
     int i = 0;
     /* RGB triplets */
+#ifdef __sparc
+    /* SPARC CPUs cannot read integers from nonaligned addresses. */
+    for (; i < pixels; i++) {
+        out[0] = in[R];
+        out[1] = in[G];
+        out[2] = in[B];
+        out += 3; in += 4;
+    }
+#else
     for (; i < pixels-1; i++) {
         ((UINT32*)out)[0] = ((UINT32*)in)[i];
         out += 3;
@@ -261,6 +270,7 @@ ImagingPackRGB(UINT8* out, const UINT8* in, int pixels)
         out[2] = in[i*4+B];
         out += 3;
     }
+#endif
 }
 
 void

diff --git a/src/libImaging/Unpack.c b/src/libImaging/Unpack.c
@@ -480,6 +480,16 @@ void
 ImagingUnpackRGB(UINT8* _out, const UINT8* in, int pixels)
 {
     int i = 0;
+#ifdef __sparc
+    /* SPARC CPUs cannot read integers from nonaligned addresses. */
+    for (; i < pixels; i++) {
+        _out[R] = in[0];
+        _out[G] = in[1];
+        _out[B] = in[2];
+        _out[A] = 255;
+        _out += 4; in += 3;
+    }
+#else
     UINT32* out = (UINT32*) _out;
     /* RGB triplets */
     for (; i < pixels-1; i++) {
@@ -490,6 +500,7 @@ ImagingUnpackRGB(UINT8* _out, const UINT8* in, int pixels)
         out[i] = MAKE_UINT32(in[0], in[1], in[2], 255);
         in += 3;
     }
+#endif
 }
 
 void
@@ -1085,22 +1096,44 @@ static void
 copy4skip1(UINT8* _out, const UINT8* in, int pixels)
 {
     int i;
+#ifdef __sparc
+    /* SPARC CPUs cannot read integers from nonaligned addresses. */
+    for (i = 0; i < pixels; i++) {
+        _out[0] = in[0];
+        _out[1] = in[1];
+        _out[2] = in[2];
+        _out[3] = in[3];
+        _out += 4; in += 5;
+    }
+#else
     UINT32* out = (UINT32*) _out;
     for (i = 0; i < pixels; i++) {
         out[i] = *(UINT32*)&in[0];
         in += 5;
     }
+#endif
 }
 
 static void
 copy4skip2(UINT8* _out, const UINT8* in, int pixels)
 {
     int i;
+#ifdef __sparc
+    /* SPARC CPUs cannot read integers from nonaligned addresses. */
+    for (i = 0; i < pixels; i++) {
+        _out[0] = in[0];
+        _out[1] = in[1];
+        _out[2] = in[2];
+        _out[3] = in[3];
+        _out += 4; in += 6;
+    }
+#else
     UINT32* out = (UINT32*) _out;
     for (i = 0; i < pixels; i++) {
         out[i] = *(UINT32*)&in[0];
         in += 6;
     }
+#endif
 }