// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * libefivar - library for the manipulation of EFI variables
 * Copyright 2018-2020 Peter M. Jones <pjones@redhat.com>
 */
#ifndef STATIC_HEXDUMP_H
#define STATIC_HEXDUMP_H

#include <ctype.h>

static inline unsigned long UNUSED
prepare_hex(uint8_t *data, unsigned long size, char *buf)
{
	unsigned long sz = (unsigned long)data % 16;
	char hexchars[] = "0123456789abcdef";
	int offset = 0;
	unsigned long i;
	unsigned long j;

	for (i = 0; i < sz; i++) {
		buf[offset++] = ' ';
		buf[offset++] = ' ';
		buf[offset++] = ' ';
		if (i == 7)
			buf[offset++] = ' ';
	}
	for (j = sz; j < 16 && j < size; j++) {
		uint8_t d = data[j-sz];
		buf[offset++] = hexchars[(d & 0xf0) >> 4];
		buf[offset++] = hexchars[(d & 0x0f)];
		if (j != 15)
			buf[offset++] = ' ';
		if (j == 7)
			buf[offset++] = ' ';
	}
	for (i = j; i < 16; i++) {
		buf[offset++] = ' ';
		buf[offset++] = ' ';
		if (i != 15)
			buf[offset++] = ' ';
		if (i == 7)
			buf[offset++] = ' ';
	}
	buf[offset] = '\0';
	return j - sz;
}

static inline void UNUSED
prepare_text(uint8_t *data, unsigned long size, char *buf)
{
	unsigned long sz = (unsigned long)data % 16;
	int offset = 0;
	unsigned long i;
	unsigned long j;

	for (i = 0; i < sz; i++)
		buf[offset++] = ' ';
	buf[offset++] = '|';
	for (j = sz; j < 16 && j < size; j++) {
		if (isprint(data[j-sz]))
			buf[offset++] = data[j-sz];
		else
			buf[offset++] = '.';
	}
	buf[offset++] = '|';
	for (i = j; i < 16; i++)
		buf[offset++] = ' ';
	buf[offset] = '\0';
}

/*
 * variadic fhexdump formatted
 * think of it as: fprintf(f, %s%s\n", vformat(fmt, ap), hexdump(data,size));
 */
static inline void UNUSED
vfhexdumpf(FILE *f, const char * const fmt, uint8_t *data, unsigned long size, va_list ap)
{
	unsigned long display_offset = (unsigned long)data & 0xffffffff;
	unsigned long offset = 0;
	//printf("hexdump: data=0x%016x size=0x%x\n", data, size);

	while (offset < size) {
		char hexbuf[49];
		char txtbuf[19];
		unsigned long sz;

		sz = prepare_hex(data+offset, size-offset, hexbuf);
		if (sz == 0)
			return;

		prepare_text(data+offset, size-offset, txtbuf);
		vfprintf(f, fmt, ap);
		fprintf(f, "%016lx  %s  %s\n", display_offset, hexbuf, txtbuf);

		display_offset += sz;
		offset += sz;
	}
	fflush(f);
}

/*
 * fhexdump formatted
 * think of it as: fprintf(f, %s%s\n", format(fmt, ...), hexdump(data,size));
 */
static inline void UNUSED
fhexdumpf(FILE *f, const char * const fmt, uint8_t *data, unsigned long size, ...)
{
	va_list ap;

	va_start(ap, size);
	vfhexdumpf(f, fmt, data, size, ap);
	va_end(ap);
}

static inline void UNUSED
hexdump(uint8_t *data, unsigned long size)
{
	fhexdumpf(stdout, "", data, size);
}

#endif /* STATIC_HEXDUMP_H */

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