33,7 → 33,19 |
import sys |
import os |
import struct |
import xstruct |
|
HEADER = xstruct.convert("little: " |
"char[4] /* 'HORD' */ " |
"uint8_t /* version */ " |
"uint8_t /* encoding */ " |
"uint32_t /* header size */ " |
"uint64_t /* payload size */ " |
) |
|
HORD_VERSION = 1 |
HORD_LSB = 1 |
|
def align_up(size, alignment): |
"Align upwards to a given alignment" |
return (((size) + ((alignment) - 1)) & ~((alignment) - 1)) |
52,6 → 64,10 |
return |
|
align = int(sys.argv[1], 0) |
if (align <= 0): |
print "<ALIGNMENT> must be positive" |
return |
|
fs_image = os.path.abspath(sys.argv[2]) |
if (not os.path.isfile(fs_image)): |
print "<FS_IMAGE> must be a file" |
60,17 → 76,20 |
inf = file(fs_image, "rb") |
outf = file(sys.argv[3], "wb") |
|
header_size = align_up(18, align) |
aligned_size = align_up(os.path.getsize(fs_image), align) |
header_size = struct.calcsize(HEADER) |
payload_size = os.path.getsize(fs_image) |
|
outf.write(struct.pack("<4sBBLQ", "HORD", 1, 1, header_size, aligned_size)) |
outf.write(struct.pack("<" + ("%d" % (header_size - 18)) + "x")) |
header_size_aligned = align_up(header_size, align) |
payload_size_aligned = align_up(payload_size, align) |
|
outf.write(struct.pack(HEADER, "HORD", HORD_VERSION, HORD_LSB, header_size_aligned, payload_size_aligned)) |
outf.write(xstruct.little_padding(header_size_aligned - header_size)) |
|
outf.write(inf.read()) |
|
padding = aligned_size - os.path.getsize(fs_image) |
padding = payload_size_aligned - payload_size |
if (padding > 0): |
outf.write(struct.pack("<" + ("%d" % padding) + "x")) |
outf.write(xstruct.little_padding(padding)) |
|
inf.close() |
outf.close() |