--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.3/spandsp-0.0.3/tests/t4_tests.c	Fri Jun 25 16:00:21 2010 +0200
@@ -0,0 +1,278 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * t4_tests.c - ITU T.4 FAX image to and from TIFF file tests
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2003 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: t4_tests.c,v 1.34 2006/11/23 15:48:09 steveu Exp $
+ */
+
+/*! \file */
+
+/*! \page t4_tests_page T.4 tests
+\section t4_tests_page_sec_1 What does it do
+These tests exercise the image compression and decompression methods defined
+in ITU specifications T.4 and T.6.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <fcntl.h>
+#include <memory.h>
+#if defined(HAVE_TGMATH_H)
+#include <tgmath.h>
+#endif
+#if defined(HAVE_MATH_H)
+#include <math.h>
+#endif
+
+#include <tiffio.h>
+
+#include "spandsp.h"
+
+#define IN_FILE_NAME    "../itutests/fax/itutests.tif"
+#define OUT_FILE_NAME   "t4_tests_receive.tif"
+
+#define XSIZE           1728
+
+t4_state_t send_state;
+t4_state_t receive_state;
+
+int main(int argc, char* argv[])
+{
+    int sends;
+    int page_no;
+    int bit;
+    int end_of_page;
+    int end_marks;
+    int i;
+    int decode_test;
+    int compression;
+    int compression_step;
+    int add_page_headers;
+    int min_row_bits;
+    int restart_pages;
+    char buf[512];
+    t4_stats_t stats;
+    const char *in_file_name;
+
+    i = 1;
+    decode_test = FALSE;
+    compression = -1;
+    add_page_headers = FALSE;
+    restart_pages = FALSE;
+    in_file_name = IN_FILE_NAME;
+    min_row_bits = 0;
+    while (i < argc)
+    {
+        if (strcmp(argv[i], "-d") == 0)
+            decode_test = TRUE;
+        else if (strcmp(argv[i], "-1") == 0)
+            compression = T4_COMPRESSION_ITU_T4_1D;
+        else if (strcmp(argv[i], "-2") == 0)
+            compression = T4_COMPRESSION_ITU_T4_2D;
+        else if (strcmp(argv[i], "-6") == 0)
+            compression = T4_COMPRESSION_ITU_T6;
+        else if (strcmp(argv[i], "-h") == 0)
+            add_page_headers = TRUE;
+        else if (strcmp(argv[i], "-r") == 0)
+            restart_pages = TRUE;
+        else if (strcmp(argv[i], "-i") == 0)
+            in_file_name = argv[++i];
+        else if (strcmp(argv[i], "-m") == 0)
+            min_row_bits = atoi(argv[++i]);
+        i++;
+    }
+    /* Create a send and a receive end */
+    memset(&send_state, 0, sizeof(send_state));
+    memset(&receive_state, 0, sizeof(receive_state));
+
+    if (decode_test)
+    {
+        if (compression < 0)
+            compression = T4_COMPRESSION_ITU_T4_1D;
+        /* Receive end puts TIFF to a new file. We assume the receive width here. */
+        if (t4_rx_init(&receive_state, OUT_FILE_NAME, T4_COMPRESSION_ITU_T4_2D))
+        {
+            printf("Failed to init\n");
+            exit(2);
+        }
+        
+        t4_rx_set_rx_encoding(&receive_state, compression);
+        t4_rx_set_x_resolution(&receive_state, T4_X_RESOLUTION_R8);
+        t4_rx_set_y_resolution(&receive_state, T4_Y_RESOLUTION_FINE);
+        t4_rx_set_image_width(&receive_state, XSIZE);
+
+        page_no = 1;
+        t4_rx_start_page(&receive_state);
+        while (fgets(buf, 511, stdin))
+        {
+            if (sscanf(buf, "Rx bit %*d - %d", &bit) == 1)
+            {
+                if ((end_of_page = t4_rx_put_bit(&receive_state, bit)))
+                {
+                    printf("End of page detected\n");
+                    break;
+                }
+            }
+        }
+#if 0
+        /* Dump the entire image as text 'X's and spaces */
+        s = receive_state.image_buffer;
+        for (i = 0;  i < receive_state.rows;  i++)
+        {
+            for (j = 0;  j < receive_state.bytes_per_row;  j++)
+            {
+                for (k = 0;  k < 8;  k++)
+                {
+                    printf((receive_state.image_buffer[i*receive_state.bytes_per_row + j] & (0x80 >> k))  ?  "X"  :  " ");
+                }
+            }
+            printf("\n");
+        }
+#endif
+        t4_rx_end_page(&receive_state);
+        t4_get_transfer_statistics(&receive_state, &stats);
+        printf("Pages = %d\n", stats.pages_transferred);
+        printf("Image size = %d x %d\n", stats.width, stats.length);
+        printf("Image resolution = %d x %d\n", stats.x_resolution, stats.y_resolution);
+        printf("Bad rows = %d\n", stats.bad_rows);
+        printf("Longest bad row run = %d\n", stats.longest_bad_row_run);
+        t4_rx_end(&receive_state);
+    }
+    else
+    {
+        /* Send end gets TIFF from a file */
+        if (t4_tx_init(&send_state, in_file_name, -1, -1))
+        {
+            printf("Failed to init TIFF send\n");
+            exit(2);
+        }
+
+        /* Receive end puts TIFF to a new file. */
+        if (t4_rx_init(&receive_state, OUT_FILE_NAME, T4_COMPRESSION_ITU_T4_2D))
+        {
+            printf("Failed to init\n");
+            exit(2);
+        }
+    
+        t4_tx_set_min_row_bits(&send_state, min_row_bits);
+
+        t4_rx_set_x_resolution(&receive_state, t4_tx_get_x_resolution(&send_state));
+        t4_rx_set_y_resolution(&receive_state, t4_tx_get_y_resolution(&send_state));
+        t4_rx_set_image_width(&receive_state, t4_tx_get_image_width(&send_state));
+
+        /* Now send and receive all the pages in the source TIFF file */
+        page_no = 1;
+        t4_tx_set_local_ident(&send_state, "852 2666 0542");
+        sends = 0;
+        /* Select whether we step round the compression schemes, or use a single specified one. */
+        compression_step = (compression < 0)  ?  0  :  -1;
+        for (;;)
+        {
+            end_marks = 0;
+            /* Add a header line to alternate pages, if required */
+            if (add_page_headers  &&  (sends & 2))
+                t4_tx_set_header_info(&send_state, "Header");
+            else
+                t4_tx_set_header_info(&send_state, NULL);
+            if (restart_pages  &&  (sends & 1))
+            {
+                /* Use restart, to send the page a second time */
+                if (t4_tx_restart_page(&send_state))
+                    break;
+            }
+            else
+            {
+                switch (compression_step)
+                {
+                case 0:
+                    compression = T4_COMPRESSION_ITU_T4_1D;
+                    compression_step++;
+                    break;
+                case 1:
+                    compression = T4_COMPRESSION_ITU_T4_2D;
+                    compression_step++;
+                    break;
+                case 2:
+                    compression = T4_COMPRESSION_ITU_T6;
+                    compression_step = 0;
+                    break;
+                }
+                t4_tx_set_tx_encoding(&send_state, compression);
+                t4_rx_set_rx_encoding(&receive_state, compression);
+
+                if (t4_tx_start_page(&send_state))
+                    break;
+            }
+            t4_rx_start_page(&receive_state);
+            do
+            {
+                bit = t4_tx_get_bit(&send_state);
+#if 0
+                if (--next_hit <= 0)
+                {
+                    do
+                        next_hit = rand() & 0x3FF;
+                    while (next_hit < 20);
+                    bit ^= (rand() & 1);
+                }
+#endif
+                if (bit == PUTBIT_END_OF_DATA)
+                {
+                    /* T.6 data does not contain an image termination sequence.
+                       T.4 1D and 2D do, and should locate that sequence. */
+                    if (compression == T4_COMPRESSION_ITU_T6)
+                        break;
+                    if (++end_marks > 50)
+                    {
+                        printf("Receiver missed the end of page mark\n");
+                        exit(2);
+                    }
+                }
+                end_of_page = t4_rx_put_bit(&receive_state, bit & 1);
+            }
+            while (!end_of_page);
+            t4_get_transfer_statistics(&receive_state, &stats);
+            printf("Pages = %d\n", stats.pages_transferred);
+            printf("Image size = %d x %d\n", stats.width, stats.length);
+            printf("Image resolution = %d x %d\n", stats.x_resolution, stats.y_resolution);
+            printf("Bad rows = %d\n", stats.bad_rows);
+            printf("Longest bad row run = %d\n", stats.longest_bad_row_run);
+            if (!restart_pages  ||  (sends & 1))
+                t4_tx_end_page(&send_state);
+            t4_rx_end_page(&receive_state);
+            sends++;
+        }
+        /* And we should now have a matching received TIFF file. Note this will only match
+           at the image level. TIFF files allow a lot of ways to express the same thing,
+           so bit matching of the files is not the normal case. */
+        t4_tx_end(&send_state);
+        t4_rx_end(&receive_state);
+    }
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/