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