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void hexDump(const char* buf, int len)
{
if (len < 1 || buf == NULL) return;
const char *hexChars = "0123456789ABCDEF";
int i = 0;
char c = 0x00;
char str_print_able[17];
char str_hex_buffer[16 * 3 + 1];
for (i = 0; i < (len / 16) * 16; i += 16)
{
int j = 0;
for (j = 0; j < 16; j++)
{
c = buf[i + j];
// hex
int z = j * 3;
str_hex_buffer[z++] = hexChars[(c >> 4) & 0x0F];
str_hex_buffer[z++] = hexChars[c & 0x0F];
str_hex_buffer[z++] = (j < 10 && !((j + 1) % 8)) ? '_' : ' ';
// string with space repalced
if (c < 32 || c == '\0' || c == '\t' || c == '\r' || c == '\n' || c == '\b')
str_print_able[j] = '.';
else
str_print_able[j] = c;
}
str_hex_buffer[16 * 3] = 0x00;
str_print_able[j] = 0x00;
printf("%04x %s %s\n", i, str_hex_buffer, str_print_able);
}
// 处理剩下的不够16字节长度的部分
int leftSize = len % 16;
if (leftSize < 1) return;
int j = 0;
int pos = i;
for (; i < len; i++)
{
c = buf[i];
// hex
int z = j * 3;
str_hex_buffer[z++] = hexChars[(c >> 4) & 0x0F];
str_hex_buffer[z++] = hexChars[c & 0x0F];
str_hex_buffer[z++] = ' ';
// string with space repalced
if (c < 32 || c == '\0' || c == '\t' || c == '\r' || c == '\n' || c == '\b')
str_print_able[j] = '.';
else
str_print_able[j] = c;
j++;
}
str_hex_buffer[leftSize * 3] = 0x00;
str_print_able[j] = 0x00;
for (j = leftSize; j < 16; j++)
{
int z = j * 3;
str_hex_buffer[z++] = ' ';
str_hex_buffer[z++] = ' ';
str_hex_buffer[z++] = ' ';
}
str_hex_buffer[16 * 3] = 0x00;
printf("%04x %s %s\n", pos, str_hex_buffer, str_print_able);
}
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