This program is meant to be used to extract *.BMP and *.JPG files from one file that has one or more of these image files stored inside of it. Corruption of the image file is verified manually after the file has been extracted.
Python, 183 lines
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jpg_magic_a = '\xFF\xD8\xFF\xE0'
jpg_magic_z = '\xFF\xD9'
def main():
welcome()
while True:
main_menu()
if main_query() == 1:
workspace()
else:
print
break
def welcome():
print
print ' Welcome to'
print 'FILE EXTRACTOR'
print '=============='
print
def main_menu():
print '(1) Open Workspace'
print '(2) Quit Application'
def main_query():
while True:
try:
select = int(raw_input('Select: '))
if 0 < select < 3:
return select
else:
print 'ERROR: Selection Must Be 1 Or 2'
except Exception, error:
if error.__class__ is EOFError:
print
print 'ERROR: Selection Must Be A Number'
def workspace():
try:
data = get_file()
while True:
work_menu()
select = work_query()
if select == 1:
extract_bmp(data)
elif select == 2:
extract_jpg(data)
elif select == 3:
break
else:
raise SystemExit
except Exception, error:
if error.__class__ is SystemExit:
raise SystemExit
else:
print
def get_file():
while True:
try:
return file(raw_input('Filename: '), 'rb', 0).read()
except Exception, error:
if error.__class__ is EOFError:
raise EOFError
else:
print 'ERROR: Filename Is Invalid'
def work_menu():
print '(1) Extract *.BMP'
print '(2) Extract *.JPG'
print '(3) Back'
print '(4) Exit'
def work_query():
while True:
try:
select = int(raw_input('Select: '))
if 0 < select < 5:
return select
else:
print 'ERROR: Selection Must Be Between 1 And 4'
except Exception, error:
if error.__class__ is EOFError:
print
print 'ERROR: Selection Must Be A Number'
def extract_bmp(data):
extract(data, True)
def extract_jpg(data):
extract(data, False)
def extract(data, bmp):
while True:
try:
size = get_size()
if bmp:
file_list = search_bmp(data, size)
else:
file_list = search_jpg(data, size)
if len(file_list) == 0:
print 'ERROR: Cannot Find File'
else:
while len(file_list) != 0:
print len(file_list), 'files can be extracted.'
select = get_select(len(file_list))
save_point = get_save_point()
save_point.write(file_list[select - 1])
save_point.close()
del file_list[select - 1]
except:
print
break
def get_size():
while True:
try:
size = int(raw_input('File Size: '))
if 0 < size < 4294967296:
return size
else:
print 'ERROR: Size Must Be Between 1 And 4294967295'
except Exception, error:
if error.__class__ is EOFError:
raise EOFError
else:
print 'ERROR: Size Must Be A Number'
def search_bmp(data, size):
global bmp_magic_a
file_list = list()
search_string = bmp_magic_a \
+ chr((size & 0xFF) >> (8 * 0)) \
+ chr((size & 0xFF00) >> (8 * 1)) \
+ chr((size & 0xFF0000) >> (8 * 2)) \
+ chr((size & 0xFF000000) >> (8 * 3))
index = data.find(search_string)
while index != -1:
file_list.append(data[index:index+size])
index = data.find(search_string, index + 1)
while len(file_list) != 0 and len(file_list[-1]) != size:
del file_list[-1]
return file_list
def search_jpg(data, size):
global jpg_magic_a, jpg_magic_z
file_list = list()
index_1 = data.find(jpg_magic_a)
index_2 = data.find(jpg_magic_z, index_1)
while index_1 != -1 and index_2 != -1:
if index_2 - index_1 == size - len(jpg_magic_z):
file_list.append(data[index_1:index_1+size])
index_1 = data.find(jpg_magic_a, index_1 + 1)
index_2 = data.find(jpg_magic_z, index_1)
return file_list
def get_select(numbers):
while True:
try:
select = int(raw_input('Extract: '))
if 1 <= select <= numbers:
return select
else:
print 'ERROR: Must Be Between 1 And', numbers
except Exception, error:
if error.__class__ is EOFError:
raise EOFError
else:
print 'ERROR: Must Be A Number'
def get_save_point():
while True:
try:
return open(raw_input('Save To: '), 'wb', 0)
except Exception, error:
if error.__class__ == EOFError:
raise EOFError
else:
print 'ERROR: Filename Is Invalid'
if __name__ == '__main__':
main()
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This program was designed for use with a deleted-file recovery program. The recovery program would old save the pictures in its special format and would not extract them. This program helped to get the files out quite easily.
Tags: programs
