added hexdump function

tests/gtcp_proxy/hexdump.c

@@ -0,0 +1,130 @@
+/**
+ * xrdp: A Remote Desktop Protocol server.
+ *
+ * Copyright (C) Laxmikant Rashinkar 2013 LK.Rashinkar@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+/**
+ * An optimized hexdump function
+ *
+ * @param  address  address to display in address column
+ * @param  buf      data to hexdump
+ * @param  len      number of bytes to dump
+ *****************************************************************************/
+
+void hexdump(int address, char *buf, int len)
+{
+    uint32_t addr;
+    char     outbuf[80];
+    int      blocks;
+    int      residual;
+    int      i;
+    int      j;
+    int      buf_index;
+    int      index2;     /* data column    */
+    int      index3;     /* ascii column   */
+
+    unsigned char c;
+
+    char cvt[] = {'0', '1', '2', '3', '4', '5', '6', '7',
+                  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+
+    if ((buf == NULL) || (len <= 0))
+        return;
+
+    addr = (address < 0) ? 0 : address;
+    blocks = len / 16;
+    residual = len - blocks * 16;
+    buf_index = 0;
+
+    for (i = 0; i < blocks; i++)
+    {
+        index2 = 10;
+        index3 = 60;
+
+        outbuf[9] = ' ';
+        outbuf[8] = ' ';
+        outbuf[7] = cvt[(addr >>  0) & 0x0000000f];
+        outbuf[6] = cvt[(addr >>  4) & 0x0000000f];
+        outbuf[5] = cvt[(addr >>  8) & 0x0000000f];
+        outbuf[4] = cvt[(addr >> 12) & 0x0000000f];
+        outbuf[3] = cvt[(addr >> 16) & 0x0000000f];
+        outbuf[2] = cvt[(addr >> 20) & 0x0000000f];
+        outbuf[1] = cvt[(addr >> 24) & 0x0000000f];
+        outbuf[0] = cvt[(addr >> 28) & 0x0000000f];
+        addr += 16;
+
+        /* insert spaces */
+        outbuf[8] = ' ';
+        outbuf[9] = ' ';
+        outbuf[58] = ' ';
+        outbuf[59] = ' ';
+
+        for (j = 0; j < 16; j++)
+        {
+            c = buf[buf_index++];
+
+            outbuf[index2++] = cvt[(c >> 4) & 0x0f];
+            outbuf[index2++] = cvt[(c >> 0) & 0x0f];
+            outbuf[index2++] = ' ';
+
+            if ((c >= 0x20) && (c <= 0x7e))
+                outbuf[index3++] = c;
+            else
+                outbuf[index3++] = '.';
+        }
+
+        outbuf[index3] = 0;
+        puts(outbuf);
+    }
+
+    if (!residual)
+        return;
+
+    outbuf[7] = cvt[(addr >>  0) & 0x0000000f];
+    outbuf[6] = cvt[(addr >>  4) & 0x0000000f];
+    outbuf[5] = cvt[(addr >>  8) & 0x0000000f];
+    outbuf[4] = cvt[(addr >> 12) & 0x0000000f];
+    outbuf[3] = cvt[(addr >> 16) & 0x0000000f];
+    outbuf[2] = cvt[(addr >> 20) & 0x0000000f];
+    outbuf[1] = cvt[(addr >> 24) & 0x0000000f];
+    outbuf[0] = cvt[(addr >> 28) & 0x0000000f];
+    addr += 16;
+
+    index2 = 10;
+    index3 = 60;
+    memset(&outbuf[8], ' ', 68);
+
+    for (j = 0; j < residual; j++)
+    {
+        c = buf[buf_index++];
+
+        outbuf[index2++] = cvt[(c >> 4) & 0x0f];
+        outbuf[index2++] = cvt[(c >> 0) & 0x0f];
+        outbuf[index2++] = ' ';
+
+        if ((c >= 0x20) && (c <= 0x7e))
+            outbuf[index3++] = c;
+        else
+            outbuf[index3++] = '.';
+    }
+
+    outbuf[index3] = 0;
+    puts(outbuf);
+}