Update to libjpeg_turbo 1.4.90

jutils.c

 /*
  * jutils.c
  *
+ * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1991-1996, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
+ * It was modified by The libjpeg-turbo Project to include only code
+ * relevant to libjpeg-turbo.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
  *
  * This file contains tables and miscellaneous utility routines needed
  * for both compression and decompression.
  * Note we prefix all global names with "j" to minimize conflicts with
  * a surrounding application.
  */
 
 #define JPEG_INTERNALS
 #include "jinclude.h"
 #include "jpeglib.h"
 
 
 /*
  * jpeg_zigzag_order[i] is the zigzag-order position of the i'th element
  * of a DCT block read in natural order (left to right, top to bottom).
  */
 
-#if 0                           /* This table is not actually needed in v6a */
+#if 0                           /* This table is not actually needed in v6a */
 
 const int jpeg_zigzag_order[DCTSIZE2] = {
    0,  1,  5,  6, 14, 15, 27, 28,
    2,  4,  7, 13, 16, 26, 29, 42,
    3,  8, 12, 17, 25, 30, 41, 43,
    9, 11, 18, 24, 31, 40, 44, 53,
   10, 19, 23, 32, 39, 45, 52, 54,
   20, 22, 33, 38, 46, 51, 55, 60,
   21, 34, 37, 47, 50, 56, 59, 61,
   35, 36, 48, 49, 57, 58, 62, 63
@@ skipping 45 matching lines @@
 GLOBAL(long)
 jround_up (long a, long b)
 /* Compute a rounded up to next multiple of b, ie, ceil(a/b)*b */
 /* Assumes a >= 0, b > 0 */
 {
   a += b - 1L;
   return a - (a % b);
 }
 
 
-/* On normal machines we can apply MEMCOPY() and MEMZERO() to sample arrays
- * and coefficient-block arrays.  This won't work on 80x86 because the arrays
- * are FAR and we're assuming a small-pointer memory model.  However, some
- * DOS compilers provide far-pointer versions of memcpy() and memset() even
- * in the small-model libraries.  These will be used if USE_FMEM is defined.
- * Otherwise, the routines below do it the hard way.  (The performance cost
- * is not all that great, because these routines aren't very heavily used.)
- */
-
-#ifndef NEED_FAR_POINTERS       /* normal case, same as regular macros */
-#define FMEMCOPY(dest,src,size) MEMCOPY(dest,src,size)
-#define FMEMZERO(target,size)   MEMZERO(target,size)
-#else                           /* 80x86 case, define if we can */
-#ifdef USE_FMEM
-#define FMEMCOPY(dest,src,size) _fmemcpy((void FAR *)(dest), (const void FAR *)(src), (size_t)(size))
-#define FMEMZERO(target,size)   _fmemset((void FAR *)(target), 0, (size_t)(size))
-#endif
-#endif
-
-
 GLOBAL(void)
 jcopy_sample_rows (JSAMPARRAY input_array, int source_row,
-                   JSAMPARRAY output_array, int dest_row,
-                   int num_rows, JDIMENSION num_cols)
+                   JSAMPARRAY output_array, int dest_row,
+                   int num_rows, JDIMENSION num_cols)
 /* Copy some rows of samples from one place to another.
  * num_rows rows are copied from input_array[source_row++]
  * to output_array[dest_row++]; these areas may overlap for duplication.
  * The source and destination arrays must be at least as wide as num_cols.
  */
 {
   register JSAMPROW inptr, outptr;
-#ifdef FMEMCOPY
-  register size_t count = (size_t) (num_cols * SIZEOF(JSAMPLE));
-#else
-  register JDIMENSION count;
-#endif
+  register size_t count = (size_t) (num_cols * sizeof(JSAMPLE));
   register int row;
 
   input_array += source_row;
   output_array += dest_row;
 
   for (row = num_rows; row > 0; row--) {
     inptr = *input_array++;
     outptr = *output_array++;
-#ifdef FMEMCOPY
-    FMEMCOPY(outptr, inptr, count);
-#else
-    for (count = num_cols; count > 0; count--)
-      *outptr++ = *inptr++;     /* needn't bother with GETJSAMPLE() here */
-#endif
+    MEMCOPY(outptr, inptr, count);
   }
 }
 
 
 GLOBAL(void)
 jcopy_block_row (JBLOCKROW input_row, JBLOCKROW output_row,
-                 JDIMENSION num_blocks)
+                 JDIMENSION num_blocks)
 /* Copy a row of coefficient blocks from one place to another. */
 {
-#ifdef FMEMCOPY
-  FMEMCOPY(output_row, input_row, num_blocks * (DCTSIZE2 * SIZEOF(JCOEF)));
-#else
-  register JCOEFPTR inptr, outptr;
-  register long count;
-
-  inptr = (JCOEFPTR) input_row;
-  outptr = (JCOEFPTR) output_row;
-  for (count = (long) num_blocks * DCTSIZE2; count > 0; count--) {
-    *outptr++ = *inptr++;
-  }
-#endif
+  MEMCOPY(output_row, input_row, num_blocks * (DCTSIZE2 * sizeof(JCOEF)));
 }
 
 
 GLOBAL(void)
-jzero_far (void FAR * target, size_t bytestozero)
-/* Zero out a chunk of FAR memory. */
+jzero_far (void *target, size_t bytestozero)
+/* Zero out a chunk of memory. */
 /* This might be sample-array data, block-array data, or alloc_large data. */
 {
-#ifdef FMEMZERO
-  FMEMZERO(target, bytestozero);
-#else
-  register char FAR * ptr = (char FAR *) target;
-  register size_t count;
-
-  for (count = bytestozero; count > 0; count--) {
-    *ptr++ = 0;
-  }
-#endif
+  MEMZERO(target, bytestozero);
 }