def create_memory_overlay(raw_meta, raw_mem, modified_mem, out_delta, print_out=sys.stdout):
# get memory delta
# raw_meta: meta data path of raw memory, e.g. hash_list+header+footer
# raw_mem: raw memory path
# modified_mem: modified memory path
# out_delta: output path of final delta
# Create Base Memory from meta file
base = Memory.import_from_metafile(raw_meta, raw_mem)
# 1.get modified page
print_out.write("[Debug] 1.get modified page list\n")
header_delta, footer_delta, original_delta_list = base.get_modified(modified_mem)
delta_list = []
for item in original_delta_list:
delta_item = DeltaItem(item.offset, item.offset_len,
hash_value=item.hash_value,
ref_id=item.ref_id,
data_len=item.data_len,
data=item.data)
delta_list.append(delta_item)
# 2.find shared with base memory
print_out.write("[Debug] 2.get delta from base Memory\n")
base.get_delta(delta_list, ref_id=DeltaItem.REF_BASE_MEM)
# 3.find shared within self
print_out.write("[Debug] 3.get delta from itself\n")
DeltaList.get_self_delta(delta_list)
DeltaList.statistics(delta_list, print_out)
DeltaList.tofile_with_footer(header_delta, footer_delta, delta_list, out_delta)
def create_memory_overlay(raw_meta,
raw_mem,
modified_mem,
out_delta,
print_out=sys.stdout):
# get memory delta
# raw_meta: meta data path of raw memory, e.g. hash_list+header+footer
# raw_mem: raw memory path
# modified_mem: modified memory path
# out_delta: output path of final delta
# Create Base Memory from meta file
base = Memory.import_from_metafile(raw_meta, raw_mem)
# 1.get modified page
print_out.write("[Debug] 1.get modified page list\n")
header_delta, footer_delta, original_delta_list = base.get_modified(
modified_mem)
delta_list = []
for item in original_delta_list:
delta_item = DeltaItem(item.offset,
item.offset_len,
hash_value=item.hash_value,
ref_id=item.ref_id,
data_len=item.data_len,
data=item.data)
delta_list.append(delta_item)
# 2.find shared with base memory
print_out.write("[Debug] 2.get delta from base Memory\n")
base.get_delta(delta_list, ref_id=DeltaItem.REF_BASE_MEM)
# 3.find shared within self
print_out.write("[Debug] 3.get delta from itself\n")
DeltaList.get_self_delta(delta_list)
DeltaList.statistics(delta_list, print_out)
DeltaList.tofile_with_footer(header_delta, footer_delta, delta_list,
out_delta)
for item in original_delta_list:
delta_item = DeltaItem(item.offset,
item.offset_len,
hash_value=item.hash_value,
ref_id=item.ref_id,
data_len=item.data_len,
data=item.data)
delta_list.append(delta_item)
# 2.find shared with base memory
print "[Debug] get delta from base Memory"
base.get_delta(delta_list, ref_id=DeltaItem.REF_BASE_MEM)
# 3.find shared within self
print "[Debug] get delta from itself"
DeltaList.get_self_delta(delta_list)
DeltaList.statistics(delta_list)
DeltaList.tofile_with_footer(header_delta, footer_delta, delta_list,
out_path)
elif command == "recover":
if (not settings.base_file) or (not settings.delta_file):
sys.stderr.write("Error, Cannot find base/delta file. See help\n")
sys.exit(1)
base_path = settings.base_file
delta_path = settings.delta_file
raw_path = settings.base_file + EXT_RAW
meta_path = settings.base_file + EXT_META
# Create Base Memory from meta file
delta_list = []
for item in original_delta_list:
delta_item = DeltaItem(item.offset, item.offset_len,
hash_value=item.hash_value,
ref_id=item.ref_id,
data_len=item.data_len,
data=item.data)
delta_list.append(delta_item)
# 2.find shared with base memory
print "[Debug] get delta from base Memory"
base.get_delta(delta_list, ref_id=DeltaItem.REF_BASE_MEM)
# 3.find shared within self
print "[Debug] get delta from itself"
DeltaList.get_self_delta(delta_list)
DeltaList.statistics(delta_list)
DeltaList.tofile_with_footer(header_delta, footer_delta, delta_list, out_path)
elif command == "recover":
if (not settings.base_file) or (not settings.delta_file):
sys.stderr.write("Error, Cannot find base/delta file. See help\n")
sys.exit(1)
base_path = settings.base_file
delta_path = settings.delta_file
raw_path = settings.base_file + EXT_RAW
meta_path = settings.base_file + EXT_META
# Create Base Memory from meta file
base = Memory.import_from_metafile(meta_path, raw_path)
