Python hex 转换成bin | bin转换成hex

使用方法：

新建文件hex2bin.py，将以下代码复制进去，新建binfile.bin、hexfile.hex文件，将需要转换的
hex内容替换hexfile.hex文件内容，三个文件保存在同一目录下，进入windows,cmd模式，切换
到hex2bin.py目录，运行"python hex2bin.py -b hexfile.hex binfile.bin"即可得到对应的bin文件。

# -*- coding:utf-8 -*-

import os
import sys
from struct import *

#intel-hex 格式
#:LLAAAARRDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDZZ
#LL——长度,单位，byte
#AAAA——16 bit 地址
#RR——类型
# - 00 数据记录 (data record)
# - 01 结束记录 (end record)
# - 02 扩展段地址记录 (paragraph record)
# - 03 转移地址记录 (transfer address record)
# - 04 扩展线性地址记录 (expand address record)
#DD——16byte数据
#ZZ——校验

last_size = 0
last_addr = 0
cur_size  = 0
cur_addr  = 0
high_addr = 0
expand_f  = 0

#hex to bin
def hex_bin(hexfile,binfile):
	#declare global var
	global last_size
	global last_addr
	global cur_size
	global cur_addr
	global high_addr
	global expand_f
	fin = open(hexfile)
	fout = open(binfile,'wb')
	result =''
	#read every lines
	for hexstr in fin.readlines():
		#去空格\n\r\t
		# print hexstr
		hexstr = hexstr.strip()
		size = int(hexstr[1:3],16)
		#RR是数据
		if int(hexstr[7:9],16) == 0:
			#expand addr deal
			if expand_f == 1:
				cur_addr = int(hexstr[3:7],16)
				#data skipped
				need_wr_size = high_addr+cur_addr-(last_addr+last_size)
				if need_wr_size != 0:
					if need_wr_size > 1000:
						print ("skipped data too large !!!")
					else:
						result=''
						for dr in range(0,need_wr_size):
							#empty space write 0xff
							b = int("0xff",16)
							result = pack('B',b)
							fout.write(result)        
				expand_f = 0
			last_size = size
			last_addr = int(hexstr[3:7],16)

			for h in range(0, size):
				b = int(hexstr[(9+h*2):(9+h*2+2)],16)
				result += pack('B',b)
			#end if
			fout.write(result)
			result=''
		#RR是结束
		elif int(hexstr[7:9],16) == 1:
			end_f = 1
		#RR是扩展地址
		elif int(hexstr[7:9],16) == 4:
			high_addr = int(hexstr[9:13],16)
			if high_addr:
				expand_f = 1
			# print hexstr,hex(high_addr),expand_f
		#end if    
	#end for
	fin.close()
	fout.close()

# bin to hex
def bin_hex(binfile,hexfile):
	fbin = open(binfile,'rb')
	fhex = open(hexfile,'w')
	offset = 0
	seg_addr = 0
	while 1:
		checksum=0 
		result = ':'
		bindata = fbin.read(0x10)
		if len(bindata) == 0 :
			break
		#end if
		result += '%02X' % len(bindata)
		result += '%04X' % offset
		result += '00'
		checksum = len(bindata)
		checksum += (offset & 0xff) + (offset >> 8)

		for i in range(0,len(bindata)):
			byte = unpack('B',bindata[i])
			result+='%02X' % byte
			checksum += byte[0]
		#end for    
		checksum = 0x01 + ~checksum
		checksum = checksum & 0xff
		result += '%02X/n' % checksum 
		fhex.write(result)
		offset += len(bindata)
		if offset == 0x10000:
			offset = 0            
			seg_addr += 1
			result = ':02000004'
			result += '%02X%02X' % ((seg_addr>>8) & 0xff,seg_addr & 0xff)
			checksum = 0x02 + 0x04 + (seg_addr>>8) + seg_addr & 0xff            
			checksum = -checksum
			result+='%02X' % (checksum & 0xff)
			result += '/n'
			fhex.write(result)
		#end if    
		if len(bindata) < 0x10:
			break
		#end if    
	#end while    
	fhex.write(':00000001FF')
	fbin.close()
	fhex.close()
#end for

if len(sys.argv) != 4 or (sys.argv[1] != '-h' and sys.argv[1] != '-b'):
	print 'usage:'
	print 'convert binary format to hexadecimal format: '
	print ' hexbin.py -h binfile hexfile'
	print 'convert hexadecimal format to binary format:'
	print ' hexbin.py -b hexfile binfile'
	exit(0)

if sys.argv[1] == '-h':
	bin_hex(sys.argv[2],sys.argv[3])
else:
	hex_bin(sys.argv[2],sys.argv[3])