/*
 * This file is derived from crc32.c in U-Boot 1.1.4.
 * For conditions of distribution and use, see copyright in crc32.c
 */

/*++ 
Copyright (c) 2010 WonderMedia Technologies, 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, either version 2 of the License, or (at your option) any later version.

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. You
should have received a copy of the GNU General Public License along with this
program. If not, see http://www.gnu.org/licenses/>.

WonderMedia Technologies, Inc.
10F, 529, Chung-Cheng Road, Hsin-Tien, Taipei 231, R.O.C.
--*/

//#include <stdio.h>
//#include <stdarg.h>
//#include <stdlib.h>
//#include <string.h>
#include <malloc.h>
#include "env.h"
#ifndef NULL
#define NULL	0
#endif
#define printf(...)
const unsigned int sf_crc_table[256] = {
  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
  0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
  0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
  0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
  0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
  0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
  0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
  0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
  0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
  0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
  0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
  0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
  0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
  0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
  0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
  0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
  0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
  0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
  0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
  0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
  0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
  0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
  0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
  0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
  0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
  0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
  0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
  0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
  0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
  0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
  0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
  0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
  0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
  0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
  0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
  0x2d02ef8d
};

#define DO1(buf) crc = sf_crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
#define DO2(buf)  do { DO1(buf); DO1(buf); } while (0)
#define DO4(buf)  do { DO2(buf); DO2(buf); } while (0)
#define DO8(buf)  do { DO4(buf); DO4(buf); } while (0)
/* ========================================================================= */
unsigned int char2int(char c)
{
	switch (c) {
	case '0':
		return 0;
	case '1':
		return 1;
	case '2':
		return 2;
	case '3':
		return 3;
	case '4':
		return 4;
	case '5':
		return 5;
	case '6':
		return 6;
	case '7':
		return 7;
	case '8':
		return 8;
	case '9':
		return 9;
	case 'A':
	case 'a':
		return 10;
	case 'B':
	case 'b':
		return 11;
	case 'C':
	case 'c':
		return 12;
	case 'D':
	case 'd':
		return 13;
	case 'E':
	case 'e':
		return 14;
	case 'F':
	case 'f':
		return 15;
	}
    return c;
}

int env_find_env(char *name, char *buf, struct env_para_def *para)
{
	unsigned int env_name_pos = 0;
	unsigned int env_para_pos = 0;
	unsigned int pos = 0;

	if (name == NULL) {
		printf(" name is NULL\n");
		return -1;
	}
	env_name_pos = 5;
	while (1) {
		if (env_cmp_name(env_name_pos, buf, name) == 0) {
			env_para_pos = env_find_para_pos(env_name_pos, buf);
			pos = env_para_pos;
			while (buf[pos])
				pos++;
			para->size = pos-env_para_pos;
			para->npos = env_name_pos;
			para->ppos = env_para_pos;
			if (para->size) {
				para->value = malloc(para->size+1);
				memset(para->value, 0, para->size+1);
				memcpy(para->value, &buf[env_para_pos], para->size+1);
			}
			return 0;
		}
		env_name_pos = env_find_next_pos(env_name_pos, buf);
		if (!buf[env_name_pos]) {
			printf(" %s can not found.....\n", name);
			/* free(buf); */
			return -1;
		}
	}
}

unsigned int sf_env_crc32(unsigned char *buf)
{
	unsigned int crc = 0;
	unsigned int len = 0xfffb;

	crc = crc ^ 0xffffffff;
	while (len >= 8) {
		DO8(buf);
		len -= 8;
	}
	if (len)
		do {
			DO1(buf);
		} while (--len);

	return crc ^ 0xffffffff;
}

char test_name[100];

int env_cmp_name(unsigned int pos, char *buf, char *name)
{
	unsigned int cnt, cnt1;
	int mach;
	unsigned int tmppos = 0;
	unsigned int tmpcnt = 0;

	memset(test_name, 0, 50);
	tmppos = pos;
	while (buf[tmppos] != '=') {
		tmpcnt++;
		tmppos++;
	}
	memcpy(test_name, &buf[pos], tmpcnt);
	printf(" %s   %s ", name, test_name);
	cnt1 = 0;
	while (name[cnt1])
		cnt1++;
	mach = 1;
	cnt = 0;
	while (1) {
		if (name[cnt] != buf[pos])
			mach = 0;
		if (!mach)
			break;
		cnt++;
		pos++;
		if ((name[cnt] == 0) || (buf[pos] == '=')) {
			if ((cnt != cnt1) || (buf[pos] != '='))
				mach = 0;
			break;
		}
	}
	if (mach) {
		printf("..... found\n");
		return 0;
	}
	printf("....... not found\n");
	return -1;
}

unsigned int env_find_next_pos(unsigned int pos, char *buf)
{
	while (buf[pos])
		pos++;
	return pos+1;
}

unsigned int env_find_para_pos(unsigned int pos, char *buf)
{
	while (buf[pos] != '=')
		pos++;
	return pos+1;
}

char *sf_env_init(unsigned int *pos)
{
	unsigned int start = 0xfffd0000;
	char env_sel;
	char *buf;

	env_sel = *(char *)(start+4);
	if (!env_sel) {
		start = 0xfffe0000;
		env_sel = *(char *)(start+4);
		if (!env_sel) {
			printf("can not find U-boot env\n");
			return NULL;
		}
	}
	*pos = start;
	buf = malloc(0x10000);
	memset(buf, 0, 0x10000);
	memcpy(buf, (char *)start, 0x10000);

	return buf;
}

int env_read_para1(char *name, struct env_para_def *para)
{
	char *buf;
	unsigned int sf_pos = 0;

	if (name == NULL) {
		printf("name is NULL\n");
		return -1;
	}
	buf = sf_env_init(&sf_pos);
	if (!buf) {
		printf("get spi fial\n");
		free(buf);
		return -1;
	}
	if (env_find_env(name, buf, para)) {
		free(buf);
		return -1;
	}
	if (!para->size) {
		printf("value/string is  NULL\n");
		free(buf);
		return -1;
	}
	free(buf);
	return 0;
}

unsigned int env_get_para_value(char *buf)
{
	unsigned int value, pos;
	unsigned int cnt = 0, tmp;

	value = 0;
	pos = 0;
	while (buf[pos] != 0) {
		value = value | (char2int(buf[pos]) << (cnt * 4));
		cnt++;
		pos++;
		if (cnt > 8) {
			printf("can not find para end failed\n");
			break;
		}
	}
	tmp = value;
	value = 0;
	cnt--;
	while (cnt) {
		value = value | ((tmp & 0x0f) << (cnt * 4));
		tmp = tmp >> 4;
		cnt--;
	}
	value = value | tmp;
	return value;
}

unsigned int env_get_env_value(char *name)
{
	struct env_para_def para;

	if (env_read_para1(name, &para))
		return 0;
	else
		return env_get_para_value(para.value);
}