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sparse_tool.py
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#! /usr/bin/env python
# -*- coding: utf-8 -*-
"""
Created on Fri Jun 9 15:54:32 2017
@author: LY
"""
import os, struct, sys
def usage(argv0):
print("""
Usage: %s sparse_image_file [align_unit_K]
""" % ( argv0 ))
sys.exit(-1)
def main():
me = os.path.basename(sys.argv[0])
if len(sys.argv) < 2:
print("Error: Not enough param")
usage(me)
in_file_path = sys.argv[1]
out_file_path = in_file_path + ".out"
if len(sys.argv) > 2:
align_unit = int(sys.argv[2])
else:
align_unit = 1024
print("in=%s out=%s align=%u" % (in_file_path, out_file_path, align_unit))
try:
fin = open(in_file_path, 'rb')
fout = open(out_file_path, 'wb')
head_bin = fin.read(28)
head_struct = list(struct.unpack("<I4H4I", head_bin))
magic = head_struct[0]
major_version = head_struct[1]
minor_version = head_struct[2]
file_hdr_sz = head_struct[3]
chunk_hdr_sz = head_struct[4]
blk_sz = head_struct[5]
total_blks = head_struct[6]
total_chunks = head_struct[7]
image_checksum = head_struct[8]
if magic == 0xED26FF3A:
print("Total of %u %u-byte output blocks in %u input chunks."
% (total_blks, blk_sz, total_chunks))
out_total_chunks = 0
out_head = bytearray(28)
out_chunk = bytearray(12)
chunk_struct = list(struct.unpack("<2H2I", out_chunk))
buffer = bytearray(align_unit * 1024)
offset = 0
i = 0
remain_count = align_unit * 1024
fout.write(out_head)
while i < total_chunks:
in_chunk = fin.read(12)
in_chunk_struct = struct.unpack("<2H2I", in_chunk)
chunk_type = in_chunk_struct[0]
reserved1 = in_chunk_struct[1]
chunk_sz = in_chunk_struct[2]
total_sz = in_chunk_struct[3]
data_sz = total_sz - 12
fill_value = 0
fill_bin = bytearray(4)
if chunk_type == 0xCAC1:#raw chunk
data_sz = chunk_sz * blk_sz
elif chunk_type == 0xCAC2:#fill chunk
fill_bin = fin.read(4)
fill_value = struct.unpack("<I", fill_bin)
data_sz = chunk_sz * blk_sz
elif chunk_type == 0xCAC3:#don't care chunk
data_sz = chunk_sz * blk_sz
else:
print("Error: Unknown chunk %04X" % (chunk_type))
break
if offset == 0:
chunk_struct[0] = chunk_type
chunk_struct[1] = 0
chunk_struct[2] = 0
chunk_struct[3] = 12
remain_count = align_unit * 1024
if data_sz > remain_count:
if offset == 0:
fout.write(in_chunk)
if chunk_type == 0xCAC1:
fout.write(fin.read(data_sz))
elif chunk_type == 0xCAC2:
fout.write(fill_bin)
else:
if chunk_struct[0] != 0xCAC3:
fout.write(struct.pack("<2H2I",*chunk_struct))
fout.write(buffer[0:offset])
else:
chunk_struct[3] = 12
fout.write(struct.pack("<2H2I",*chunk_struct))
if chunk_type == 0xCAC2:
fin.seek(-16,os.SEEK_CUR)
else:
fin.seek(-12,os.SEEK_CUR)
i -= 1
out_total_chunks += 1
offset = 0
elif data_sz == remain_count:
if offset == 0:
fout.write(in_chunk)
if chunk_type == 0xCAC1:
fout.write(fin.read(data_sz))
elif chunk_type == 0xCAC2:
fout.write(fill_bin)
else:
if chunk_type == 0xCAC1:#raw chunk
if chunk_struct[0] != 0xCAC1:
chunk_struct[0] = 0xCAC1
chunk_struct[2] += chunk_sz
chunk_struct[3] += data_sz
buffer[offset:] = fin.read(data_sz)
elif chunk_type == 0xCAC2:#fill chunk
if chunk_struct[0] != 0xCAC1:
chunk_struct[0] = 0xCAC1
chunk_struct[2] += chunk_sz
chunk_struct[3] += data_sz
buffer[offset:] = [(fill_value % 256) for j in range(data_sz)]
elif chunk_type == 0xCAC3:#don't care chunk
buffer[offset:] = [0 for j in range(data_sz)]
chunk_struct[2] += chunk_sz
chunk_struct[3] += data_sz
offset += data_sz
remain_count -= data_sz
if chunk_struct[0] == 0xCAC3:
chunk_struct[3] = 12
fout.write(struct.pack("<2H2I",*chunk_struct))
if chunk_struct[0] != 0xCAC3:
fout.write(buffer)
out_total_chunks += 1
offset = 0
else:
if chunk_type == 0xCAC1:#raw chunk
if chunk_struct[0] != 0xCAC1:
chunk_struct[0] = 0xCAC1
chunk_struct[2] += chunk_sz
chunk_struct[3] += data_sz
buffer[offset:offset + data_sz] = fin.read(data_sz)
elif chunk_type == 0xCAC2:#fill chunk
if chunk_struct[0] != 0xCAC1:
chunk_struct[0] = 0xCAC1
chunk_struct[2] += chunk_sz
chunk_struct[3] += data_sz
buffer[offset:offset + data_sz] = [(fill_value % 256) for j in range(data_sz)]
elif chunk_type == 0xCAC3:#don't care chunk
buffer[offset:offset + data_sz] = [0 for j in range(data_sz)]
chunk_struct[2] += chunk_sz
chunk_struct[3] += data_sz
offset += data_sz
remain_count -= data_sz
i += 1
if offset > 0:
if chunk_struct[0] == 0xCAC3:
chunk_struct[3] = 12
fout.write(struct.pack("<2H2I",*chunk_struct))
if chunk_struct[0] != 0xCAC3:
fout.write(buffer)
out_total_chunks += 1
offset = 0;
fout.seek(0, os.SEEK_SET)
head_struct[7] = out_total_chunks
fout.write(struct.pack("<I4H4I", *head_struct))
fin.close()
fout.close()
print("Generating optimized sparse image done,total_chunk=%u." % (out_total_chunks))
else:
print("Error: %s: Magic should be 0xED26FF3A but is 0x%08X" % (in_file_path, magic))
except Exception as e:
print("Exception:" + str(e))
print("i=%u" % (i))
if fin:
fin.close()
if fout:
fout.close()
sys.exit(0)
if __name__ == "__main__":
main()