/*
* Copyright (c) 2018 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/

/* Simple clone of the xxd tool used at build time. Used to
 * create headers out of source files. Only used for core libraries
 * like the bootstrapping code and the stl. */

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>

#define BUFSIZE 1024
#define PERLINE 10

int main(int argc, const char **argv) {

	static const char hex[] = "0123456789ABCDEF";
	char buf[BUFSIZE];
	size_t bytesRead = 0;
	int lineIndex = 0;
	int line = 0;

	if (argc != 4) {
		fprintf(stderr, "Usage: %s infile outfile symbol\n", argv[0]);
		return 1;
	}

	/* Open the files */
	FILE *in = fopen(argv[1], "rb");
	FILE *out = fopen(argv[2], "wb");

	/* Check if files open successfully */
	if (in == NULL) {
		fprintf(stderr, "Could not open input file %s\n", argv[1]);
		return 1;
	} else if (out == NULL) {
		fprintf(stderr, "Could not open output file %s\n", argv[2]);
		return 1;
	}

	/* Write the header */
	fprintf(out, "/* Auto generated - DO NOT EDIT */\n\n");
	fprintf(out, "static const unsigned char %s[] = {", argv[3]);

	/* Read in chunks from buffer */
	while ((bytesRead = fread(buf, 1, sizeof(buf), in)) > 0) {
		size_t i;
		for (i = 0; i < bytesRead; ++i) {
			int byte = ((uint8_t *)buf) [i];

			/* Write the byte */
			if (lineIndex++ == 0) {
				if (line++)
					fputc(',', out);
				fputs("\n\t", out);
			} else {
				fputs(", ", out);
			}
			fputs("0x", out);
			fputc(hex[byte >> 4], out);
			fputc(hex[byte & 0xF], out);

			/* Make line index wrap */
			if (lineIndex >= PERLINE)
				lineIndex = 0;

		}
  	}

  	/* Write the tail */
	fputs("\n};\n\n", out);

	/* Close the file handles */
	fclose(in);
	fclose(out);

	return 0;
}