#include "FileIO.h"

#include <stdint.h>				 /* uint8_t */
#include <stdio.h>
#include <math.h>

#include <errno.h>				 /* errno */
#include <string.h>				 /* strerror */

static int
IsProbablyAscii (const void *buf, const size_t len)
{
	const uint8_t *bufPtr;
	const uint8_t *bufPtrEnd;
	size_t nAsciiCount;
	nAsciiCount = 0;
	bufPtr = (const uint8_t *) buf;
	bufPtrEnd = bufPtr + len;
	while (bufPtr < bufPtrEnd && (NULL != bufPtr) && (*bufPtr != '\0'))
	{
		nAsciiCount += (*bufPtr >= ' ') && (*bufPtr <= '~');
		bufPtr++;
	}
	return (int) round ((double) nAsciiCount / (double) len);
}


static void
HexDump (const void *buf, const size_t len)
{
	const uint8_t *bufPtr;
	const uint8_t *bufPtrEnd;
	const size_t width = 16;
	size_t nout;
	nout = 0;
	bufPtr = (const uint8_t *) buf;
	bufPtrEnd = bufPtr + len;
	while (bufPtr < bufPtrEnd && (NULL != bufPtr))
	{
		if (nout == width)
		{
			printf ("\n");
			nout = 0;
		}
		printf ("%02x ", *bufPtr);
		bufPtr++;
		nout++;
	}
	puts ("");
}


int
main (int argc, char **argv)
{
	int rc;
	rc = 1;
	try
	{
		while (argc-- > 1)
		{
			FileIO f (argv[argc], "r");
			std::string buf = f.ReadToString ();
			if (IsProbablyAscii (buf.c_str (), buf.size ()))
				printf ("%s", buf.c_str ());
			else
				HexDump (buf.c_str (), buf.size ());
			rc = 0;
		}
	}
	catch (int err)
	{
		puts (strerror (errno));
	}

	return rc;
}