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74 lines
2.4 KiB
74 lines
2.4 KiB
#! /usr/bin/python3
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# Given a directory name as argument, this script generates an espfs filesystem image
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# with all the html, js, css, png, and ico files found in the directory tree.
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# Each file is compressed with gzip so it can be served up in compressed form from the esp8266.
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# Format description from Jeroen:
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# The idea 'borrows' from cpio: it's basically a concatenation of {header, filename, file} data.
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# Header, filename and file data is 32-bit aligned. The last file is indicated by data-less header
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# with the FLAG_LASTFILE flag set.
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#
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# #define FLAG_LASTFILE (1<<0)
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# #define FLAG_GZIP (1<<1)
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# #define COMPRESS_NONE 0
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# #define COMPRESS_HEATSHRINK 1
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# #define ESPFS_MAGIC 0x73665345
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#
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# typedef struct {
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# int32_t magic;
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# int8_t flags;
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# int8_t compression;
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# int16_t nameLen; // name must be null-terminated and NameLen includes padding!
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# int32_t fileLenComp;
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# int32_t fileLenDecomp;
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# } __attribute__((packed)) EspFsHeader;
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from sys import argv, exit, stderr, stdout
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from pathlib import Path
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import re, gzip, struct
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def mkespfs(dir, outbuf):
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MAGIC = 0x73665345
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FL_GZIP = 2 # gzipped file flag
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FL_LAST = 1 # last entry file flag
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sz = 0
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for fn in Path(dir).rglob('*.*'):
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if not fn.is_file(): continue
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out_path = fn.relative_to(dir).as_posix().encode('ascii') + b'\000'
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while len(out_path) & 3 != 0: out_path += b'\000'
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info = fn.stat()
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data_un = fn.read_bytes()
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data_comp = gzip.compress(data_un)
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flag = FL_GZIP
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if len(data_un) <= len(data_comp):
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data_comp = data_un
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flag = 0
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print("Processing {} -> {}[{}], {}->{} bytes".format(fn, out_path, len(out_path), info.st_size,
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len(data_comp)), file=stderr)
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header = struct.pack('<IBBHII', MAGIC, flag, 0, len(out_path), len(data_comp), info.st_size)
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outbuf.write(header)
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sz += len(header)
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outbuf.write(out_path)
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outbuf.write(data_comp)
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sz += len(data_comp)
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if len(data_comp)%4 != 0:
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outbuf.write(bytes(4)[:4-len(data_comp)%4])
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sz = (sz+3) // 4 * 4
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trailer = struct.pack('<IBBHII', MAGIC, FL_LAST, 0, 0, 0, 0)
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outbuf.write(trailer)
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sz += len(trailer)
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print("espfs image: {} bytes".format(sz), file=stderr)
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if __name__ == "__main__":
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if len(argv) != 2 or not Path(argv[1]).is_dir():
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print("Usage: {} directory".format(argv[0]), file=stderr)
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exit(1)
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mkespfs(argv[1], stdout.buffer)
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