lib/memzip: Factor out memzip from teensy/ into lib/memzip.
Dave Hylands
7 years ago
committed by
Damien George
parent
a9f3030371
commit
074d713bfb
@ -0,0 +1,28 @@
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MEMZIP - a simple readonly file system
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memzip takes a zip file which is comprised of uncompressed files and
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and presents it as a filesystem, allowing Python files to be imported.
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The script make-memzip.py takes a directory name and will create a zip file
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containing uncompressed files found in the directory. It will then generate
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a C file which contains the data from the zip file.
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A typical addition to a makefile would look like:
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```
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SRC_C += \
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lib/memzip/import.c \
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lib/memzip/lexermemzip.c \
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lib/memzip/memzip.c \
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OBJ += $(BUILD)/memzip-files.o
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MAKE_MEMZIP = ../lib/memzip/make-memzip.py
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$(BUILD)/memzip-files.o: $(BUILD)/memzip-files.c
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$(call compile_c)
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$(BUILD)/memzip-files.c: $(shell find ${MEMZIP_DIR} -type f)
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@$(ECHO) "Creating $@"
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$(Q)$(PYTHON) $(MAKE_MEMZIP) --zip-file $(BUILD)/memzip-files.zip --c-file $@ $(MEMZIP_DIR)
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```
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@ -0,0 +1,79 @@
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#!/usr/bin/env python
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#
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# Takes a directory of files and zips them up (as uncompressed files).
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# This then gets converted into a C data structure which can be read
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# like a filesystem at runtime.
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#
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# This is somewhat like frozen modules in python, but allows arbitrary files
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# to be used.
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from __future__ import print_function
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import argparse
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import os
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import subprocess
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import sys
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import types
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def create_zip(zip_filename, zip_dir):
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abs_zip_filename = os.path.abspath(zip_filename)
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save_cwd = os.getcwd()
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os.chdir(zip_dir)
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if os.path.exists(abs_zip_filename):
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os.remove(abs_zip_filename)
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subprocess.check_call(['zip', '-0', '-r', '-D', abs_zip_filename, '.'])
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os.chdir(save_cwd)
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def create_c_from_file(c_filename, zip_filename):
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with open(zip_filename, 'rb') as zip_file:
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with open(c_filename, 'wb') as c_file:
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print('#include <stdint.h>', file=c_file)
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print('', file=c_file)
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print('const uint8_t memzip_data[] = {', file=c_file)
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while True:
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buf = zip_file.read(16)
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if not buf:
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break
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print(' ', end='', file=c_file)
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for byte in buf:
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if type(byte) is types.StringType:
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print(' 0x{:02x},'.format(ord(byte)), end='', file=c_file)
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else:
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print(' 0x{:02x},'.format(byte), end='', file=c_file)
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print('', file=c_file)
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print('};', file=c_file)
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def main():
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parser = argparse.ArgumentParser(
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prog='make-memzip.py',
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usage='%(prog)s [options] [command]',
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description='Generates a C source memzip file.'
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)
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parser.add_argument(
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'-z', '--zip-file',
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dest='zip_filename',
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help='Specifies the name of the created zip file.',
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default='memzip_files.zip'
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)
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parser.add_argument(
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'-c', '--c-file',
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dest='c_filename',
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help='Specifies the name of the created C source file.',
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default='memzip_files.c'
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)
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parser.add_argument(
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dest='source_dir',
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default='memzip_files'
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)
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args = parser.parse_args(sys.argv[1:])
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print('args.zip_filename =', args.zip_filename)
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print('args.c_filename =', args.c_filename)
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print('args.source_dir =', args.source_dir)
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create_zip(args.zip_filename, args.source_dir)
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create_c_from_file(args.c_filename, args.zip_filename)
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if __name__ == "__main__":
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main()
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