32,83 → 32,104 |
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import sys |
import os |
import struct |
import xstruct |
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def align_up(size, alignment): |
"Align upwards to a given alignment" |
return (((size) + ((alignment) - 1)) & ~((alignment) - 1)) |
HEADER = """little: |
char tag[5] /* 'TMPFS' */ |
""" |
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DENTRY_NONE = """little: |
uint8_t kind /* NONE */ |
uint32_t fname_len /* 0 */ |
""" |
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DENTRY_FILE = """little: |
uint8_t kind /* FILE */ |
uint32_t fname_len /* filename length */ |
char fname[%d] /* filename */ |
uint32_t flen /* file length */ |
""" |
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DENTRY_DIRECTORY = """little: |
uint8_t kind /* DIRECTORY */ |
uint32_t fname_len /* filename length */ |
char fname[%d] /* filename */ |
""" |
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TMPFS_NONE = 0 |
TMPFS_FILE = 1 |
TMPFS_DIRECTORY = 2 |
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def usage(prname): |
"Print usage syntax" |
print prname + " <ALIGNMENT> <PATH> <IMAGE>" |
print prname + " <PATH> <IMAGE>" |
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def recursion(root, outf): |
"Recursive directory walk" |
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payload_size = 0 |
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for name in os.listdir(root): |
canon = os.path.join(root, name) |
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if (os.path.isfile(canon)): |
outf.write(struct.pack("<BL" + ("%d" % len(name)) + "s", 1, len(name), name)) |
payload_size += 5 + len(name) |
size = os.path.getsize(canon) |
rd = 0; |
outf.write(struct.pack("<L", size)) |
payload_size += 4 |
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dentry = xstruct.create(DENTRY_FILE % len(name)) |
dentry.kind = TMPFS_FILE |
dentry.fname_len = len(name) |
dentry.fname = name |
dentry.flen = size |
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outf.write(dentry.pack()) |
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inf = file(canon, "r") |
rd = 0; |
while (rd < size): |
data = inf.read(4096); |
outf.write(data) |
payload_size += len(data) |
rd += len(data) |
inf.close() |
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if (os.path.isdir(canon)): |
outf.write(struct.pack("<BL" + ("%d" % len(name)) + "s", 2, len(name), name)) |
payload_size += 5 + len(name) |
payload_size += recursion(canon, outf) |
outf.write(struct.pack("<BL", 0, 0)) |
payload_size += 5 |
dentry = xstruct.create(DENTRY_DIRECTORY % len(name)) |
dentry.kind = TMPFS_DIRECTORY |
dentry.fname_len = len(name) |
dentry.fname = name |
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return payload_size |
outf.write(dentry.pack()) |
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recursion(canon, outf) |
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dentry = xstruct.create(DENTRY_NONE) |
dentry.kind = TMPFS_NONE |
dentry.fname_len = 0 |
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outf.write(dentry.pack()) |
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def main(): |
if (len(sys.argv) < 4): |
if (len(sys.argv) < 3): |
usage(sys.argv[0]) |
return |
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if (not sys.argv[1].isdigit()): |
print "<ALIGNMENT> must be a number" |
return |
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align = int(sys.argv[1], 0) |
path = os.path.abspath(sys.argv[2]) |
path = os.path.abspath(sys.argv[1]) |
if (not os.path.isdir(path)): |
print "<PATH> must be a directory" |
return |
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header_size = align_up(18, align) |
outf = file(sys.argv[3], "w") |
outf.write(struct.pack("<" + ("%d" % header_size) + "x")) |
outf = file(sys.argv[2], "w") |
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outf.write(struct.pack("<5s", "TMPFS")) |
payload_size = 5 |
header = xstruct.create(HEADER) |
header.tag = "TMPFS" |
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payload_size += recursion(path, outf) |
outf.write(header.pack()) |
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outf.write(struct.pack("<BL", 0, 0)) |
payload_size += 5 |
recursion(path, outf) |
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aligned_size = align_up(payload_size, align) |
dentry = xstruct.create(DENTRY_NONE) |
dentry.kind = TMPFS_NONE |
dentry.fname_len = 0 |
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if (aligned_size - payload_size > 0): |
outf.write(struct.pack("<" + ("%d" % (aligned_size - payload_size)) + "x")) |
outf.write(dentry.pack()) |
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outf.seek(0) |
outf.write(struct.pack("<4sBBLQ", "HORD", 1, 1, header_size, aligned_size)) |
outf.close() |
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if __name__ == '__main__': |