/*
 * common utility functions for cbfstool
 *
 * Copyright (C) 2009 coresystems GmbH
 *                 written by Patrick Georgi <patrick.georgi@coresystems.de>
 * Copyright (C) 2012 Google, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <libgen.h>
#include "common.h"
#include "cbfs.h"

/* Utilities */
int verbose = 0;

/* Small, OS/libc independent runtime check for endianess */
int is_big_endian(void)
{
	static const uint32_t inttest = 0x12345678;
	const uint8_t inttest_lsb = *(const uint8_t *)&inttest;
	if (inttest_lsb == 0x12) {
		return 1;
	}
	return 0;
}

static off_t get_file_size(FILE *f)
{
	off_t fsize;
	fseek(f, 0, SEEK_END);
	fsize = ftell(f);
	fseek(f, 0, SEEK_SET);
	return fsize;
}

/* Buffer and file I/O */
int buffer_create(struct buffer *buffer, size_t size, const char *name)
{
	buffer->name = strdup(name);
	buffer->offset = 0;
	buffer->size = size;
	buffer->data = (char *)malloc(buffer->size);
	if (!buffer->data) {
		fprintf(stderr, "buffer_create: Insufficient memory (0x%zx).\n",
			size);
	}
	return (buffer->data == NULL);
}

int buffer_from_file(struct buffer *buffer, const char *filename)
{
	FILE *fp = fopen(filename, "rb");
	if (!fp) {
		perror(filename);
		return -1;
	}
	buffer->offset = 0;
	off_t file_size = get_file_size(fp);
	if (file_size < 0) {
		fprintf(stderr, "could not determine size of %s\n", filename);
		fclose(fp);
		return -1;
	}
	buffer->size = file_size;
	buffer->name = strdup(filename);
	buffer->data = (char *)malloc(buffer->size);
	assert(buffer->data);
	if (fread(buffer->data, 1, buffer->size, fp) != buffer->size) {
		fprintf(stderr, "incomplete read: %s\n", filename);
		fclose(fp);
		buffer_delete(buffer);
		return -1;
	}
	fclose(fp);
	return 0;
}

int buffer_write_file(struct buffer *buffer, const char *filename)
{
	FILE *fp = fopen(filename, "wb");
	if (!fp) {
		perror(filename);
		return -1;
	}
	assert(buffer && buffer->data);
	if (fwrite(buffer->data, 1, buffer->size, fp) != buffer->size) {
		fprintf(stderr, "incomplete write: %s\n", filename);
		fclose(fp);
		return -1;
	}
	fclose(fp);
	return 0;
}

void buffer_delete(struct buffer *buffer)
{
	assert(buffer);
	if (buffer->name) {
		free(buffer->name);
		buffer->name = NULL;
	}
	if (buffer->data) {
		free(buffer_get_original_backing(buffer));
		buffer->data = NULL;
	}
	buffer->offset = 0;
	buffer->size = 0;
}

static struct {
	uint32_t arch;
	const char *name;
} arch_names[] = {
	{ CBFS_ARCHITECTURE_AARCH64, "arm64" },
	{ CBFS_ARCHITECTURE_ARM, "arm" },
	{ CBFS_ARCHITECTURE_MIPS, "mips" },
	{ CBFS_ARCHITECTURE_PPC64, "ppc64" },
	/* power8 is a reasonable alias */
	{ CBFS_ARCHITECTURE_PPC64, "power8" },
	{ CBFS_ARCHITECTURE_RISCV, "riscv" },
	{ CBFS_ARCHITECTURE_X86, "x86" },
	{ CBFS_ARCHITECTURE_UNKNOWN, "unknown" }
};

uint32_t string_to_arch(const char *arch_string)
{
	size_t i;
	uint32_t ret = CBFS_ARCHITECTURE_UNKNOWN;

	for (i = 0; i < ARRAY_SIZE(arch_names); i++) {
		if (!strcasecmp(arch_string, arch_names[i].name)) {
			ret = arch_names[i].arch;
			break;
		}
	}

	return ret;
}

const char *arch_to_string(uint32_t a)
{
        size_t i;
	const char *ret = NULL;

	for (i = 0; i < ARRAY_SIZE(arch_names); i++) {
		if (a == arch_names[i].arch) {
			ret = arch_names[i].name;
			break;
		}
	}

	return ret;
}

void print_supported_filetypes(void)
{
	int i, number = ARRAY_SIZE(filetypes);

	for (i=0; i<number; i++) {
		LOG(" %s%c", filetypes[i].name, (i==(number-1))?'\n':',');
		if ((i%8) == 7)
			LOG("\n");
	}
}

uint64_t intfiletype(const char *name)
{
	size_t i;
	for (i = 0; i < (sizeof(filetypes) / sizeof(struct typedesc_t)); i++)
		if (strcmp(filetypes[i].name, name) == 0)
			return filetypes[i].type;
	return -1;
}

char *bintohex(uint8_t *data, size_t len)
{
	static const char translate[16] = "0123456789abcdef";

	char *result = malloc(len * 2 + 1);
	if (result == NULL)
		return NULL;

	result[len*2] = '\0';
	unsigned int i;
	for (i = 0; i < len; i++) {
		result[i*2] = translate[(data[i] >> 4) & 0xf];
		result[i*2+1] = translate[data[i] & 0xf];
	}
	return result;
}