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diff --git a/tiff/test/raw_decode.c b/tiff/test/raw_decode.c
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+/* $Id: raw_decode.c,v 1.5 2012-12-20 18:08:07 tgl Exp $ */
+
+/*
+ * Copyright (c) 2012, Frank Warmerdam <warmerdam@pobox.com>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the names of
+ * Sam Leffler and Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Sam Leffler and Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+/*
+ * TIFF Library
+ *
+ * The objective of this test suite is to test the JPEGRawDecode()
+ * interface via TIFReadEncodedTile(). This function with YCbCr subsampling
+ * is a frequent source of bugs.
+ */
+
+#include "tif_config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include "tiffio.h"
+
+#include "jpeglib.h" /* Needed for JPEG_LIB_VERSION */
+
+static unsigned char cluster_0[] = { 0, 0, 2, 0, 138, 139 };
+static unsigned char cluster_64[] = { 0, 0, 9, 6, 134, 119 };
+static unsigned char cluster_128[] = { 44, 40, 63, 59, 230, 95 };
+
+static int check_cluster( int cluster, unsigned char *buffer, unsigned char *expected_cluster ) {
+ unsigned char *target = buffer + cluster*6;
+
+ if (memcmp(target, expected_cluster, 6) == 0) {
+ return 0;
+ }
+
+ fprintf( stderr, "Cluster %d did not match expected results.\n", cluster );
+ fprintf( stderr,
+ "Expect: %3d %3d %3d %3d\n"
+ " %3d %3d\n",
+ expected_cluster[0], expected_cluster[1],
+ expected_cluster[4], expected_cluster[5],
+ expected_cluster[2], expected_cluster[3] );
+ fprintf( stderr,
+ " Got: %3d %3d %3d %3d\n"
+ " %3d %3d\n",
+ target[0], target[1],
+ target[4], target[5],
+ target[2], target[3] );
+ return 1;
+}
+
+static int check_rgb_pixel( int pixel,
+ int min_red, int max_red,
+ int min_green, int max_green,
+ int min_blue, int max_blue,
+ unsigned char *buffer ) {
+ unsigned char *rgb = buffer + 3 * pixel;
+
+ if( rgb[0] >= min_red && rgb[0] <= max_red &&
+ rgb[1] >= min_green && rgb[1] <= max_green &&
+ rgb[2] >= min_blue && rgb[2] <= max_blue ) {
+ return 0;
+ }
+
+ fprintf( stderr, "Pixel %d did not match expected results.\n", pixel );
+ fprintf( stderr, "Got R=%d (expected %d..%d), G=%d (expected %d..%d), B=%d (expected %d..%d)\n",
+ rgb[0], min_red, max_red,
+ rgb[1], min_green, max_green,
+ rgb[2], min_blue, max_blue );
+ return 1;
+}
+
+static int check_rgba_pixel( int pixel,
+ int min_red, int max_red,
+ int min_green, int max_green,
+ int min_blue, int max_blue,
+ int min_alpha, int max_alpha,
+ uint32 *buffer ) {
+ /* RGBA images are upside down - adjust for normal ordering */
+ int adjusted_pixel = pixel % 128 + (127 - (pixel/128)) * 128;
+ uint32 rgba = buffer[adjusted_pixel];
+
+ if( TIFFGetR(rgba) >= (uint32) min_red &&
+ TIFFGetR(rgba) <= (uint32) max_red &&
+ TIFFGetG(rgba) >= (uint32) min_green &&
+ TIFFGetG(rgba) <= (uint32) max_green &&
+ TIFFGetB(rgba) >= (uint32) min_blue &&
+ TIFFGetB(rgba) <= (uint32) max_blue &&
+ TIFFGetA(rgba) >= (uint32) min_alpha &&
+ TIFFGetA(rgba) <= (uint32) max_alpha ) {
+ return 0;
+ }
+
+ fprintf( stderr, "Pixel %d did not match expected results.\n", pixel );
+ fprintf( stderr, "Got R=%d (expected %d..%d), G=%d (expected %d..%d), B=%d (expected %d..%d), A=%d (expected %d..%d)\n",
+ TIFFGetR(rgba), min_red, max_red,
+ TIFFGetG(rgba), min_green, max_green,
+ TIFFGetB(rgba), min_blue, max_blue,
+ TIFFGetA(rgba), min_alpha, max_alpha );
+ return 1;
+}
+
+int
+main(int argc, char **argv)
+{
+ TIFF *tif;
+ static const char *srcfilerel = "images/quad-tile.jpg.tiff";
+ char *srcdir = NULL;
+ char srcfile[1024];
+ unsigned short h, v;
+ int status;
+ unsigned char *buffer;
+ uint32 *rgba_buffer;
+ tsize_t sz, szout;
+ unsigned int pixel_status = 0;
+
+ (void) argc;
+ (void) argv;
+
+ if ((srcdir = getenv("srcdir")) == NULL) {
+ srcdir = ".";
+ }
+ if ((strlen(srcdir) + 1 + strlen(srcfilerel)) >= sizeof(srcfile)) {
+ fprintf( stderr, "srcdir too long %s\n", srcdir);
+ exit( 1 );
+ }
+ strcpy(srcfile,srcdir);
+ strcat(srcfile,"/");
+ strcat(srcfile,srcfilerel);
+
+ tif = TIFFOpen(srcfile,"r");
+ if ( tif == NULL ) {
+ fprintf( stderr, "Could not open %s\n", srcfile);
+ exit( 1 );
+ }
+
+ status = TIFFGetField(tif,TIFFTAG_YCBCRSUBSAMPLING, &h, &v);
+ if ( status == 0 || h != 2 || v != 2) {
+ fprintf( stderr, "Could not retrieve subsampling tag.\n" );
+ exit(1);
+ }
+
+ /*
+ * What is the appropriate size of a YCbCr encoded tile?
+ */
+ sz = TIFFTileSize(tif);
+ if( sz != 24576) {
+ fprintf(stderr, "tiles are %d bytes\n", (int)sz);
+ exit(1);
+ }
+
+ buffer = (unsigned char *) malloc(sz);
+
+ /*
+ * Read a tile in decompressed form, but still YCbCr subsampled.
+ */
+ szout = TIFFReadEncodedTile(tif,9,buffer,sz);
+ if (szout != sz) {
+ fprintf( stderr,
+ "Did not get expected result code from TIFFReadEncodedTile()(%d instead of %d)\n",
+ (int) szout, (int) sz );
+ return 1;
+ }
+
+ if( check_cluster( 0, buffer, cluster_0 )
+ || check_cluster( 64, buffer, cluster_64 )
+ || check_cluster( 128, buffer, cluster_128 ) ) {
+ exit(1);
+ }
+ free(buffer);
+
+ /*
+ * Read a tile using the built-in conversion to RGB format provided by the JPEG library.
+ */
+ TIFFSetField(tif, TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RGB);
+
+ sz = TIFFTileSize(tif);
+ if( sz != 128*128*3) {
+ fprintf(stderr, "tiles are %d bytes\n", (int)sz);
+ exit(1);
+ }
+
+ buffer = (unsigned char *) malloc(sz);
+
+ szout = TIFFReadEncodedTile(tif,9,buffer,sz);
+ if (szout != sz) {
+ fprintf( stderr,
+ "Did not get expected result code from TIFFReadEncodedTile()(%d instead of %d)\n",
+ (int) szout, (int) sz );
+ return 1;
+ }
+
+ /*
+ * JPEG decoding is inherently inexact, so we can't test for exact
+ * pixel values. (Well, if we knew exactly which libjpeg version
+ * we were using, and with what settings, we could expect specific
+ * values ... but it's not worth the trouble to keep track of.)
+ * Hence, use ranges of expected values. The ranges may need to be
+ * widened over time as more versions of libjpeg appear.
+ */
+ pixel_status |= check_rgb_pixel( 0, 15, 18, 0, 0, 18, 41, buffer );
+ pixel_status |= check_rgb_pixel( 64, 0, 0, 0, 0, 0, 2, buffer );
+ pixel_status |= check_rgb_pixel( 512, 5, 6, 34, 36, 182, 196, buffer );
+
+ free( buffer );
+
+ TIFFClose(tif);
+
+ /*
+ * Reopen and test reading using the RGBA interface.
+ */
+ tif = TIFFOpen(srcfile,"r");
+
+ sz = 128 * 128 * sizeof(uint32);
+ rgba_buffer = (uint32 *) malloc(sz);
+
+ if (!TIFFReadRGBATile( tif, 1*128, 2*128, rgba_buffer )) {
+ fprintf( stderr, "TIFFReadRGBATile() returned failure code.\n" );
+ return 1;
+ }
+
+ /*
+ * Currently TIFFReadRGBATile() just uses JPEGCOLORMODE_RGB so this
+ * trivally matches the last results. Eventually we should actually
+ * accomplish it from the YCbCr subsampled buffer ourselves in which
+ * case the results may be subtly different but similar.
+ */
+ pixel_status |= check_rgba_pixel( 0, 15, 18, 0, 0, 18, 41, 255, 255,
+ rgba_buffer );
+ pixel_status |= check_rgba_pixel( 64, 0, 0, 0, 0, 0, 2, 255, 255,
+ rgba_buffer );
+ pixel_status |= check_rgba_pixel( 512, 5, 6, 34, 36, 182, 196, 255, 255,
+ rgba_buffer );
+
+ free( rgba_buffer );
+ TIFFClose(tif);
+
+ if (pixel_status) {
+ exit(1);
+ }
+
+ exit( 0 );
+}
+
+/* vim: set ts=8 sts=8 sw=8 noet: */
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 8
+ * fill-column: 78
+ * End:
+ */