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Rev 3536 Rev 3597
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import os
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import os
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import random
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import random
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import xstruct
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import xstruct
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import array
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import array
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exclude_names = set(['.svn'])
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def align_up(size, alignment):
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def align_up(size, alignment):
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    "Return size aligned up to alignment"
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    "Return size aligned up to alignment"
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    if (size % alignment == 0):
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    if (size % alignment == 0):
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        return size
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        return size
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    files = 2
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    files = 2
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    for name in os.listdir(root):
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    for name in os.listdir(root):
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        canon = os.path.join(root, name)
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        canon = os.path.join(root, name)
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        if (os.path.isfile(canon)):
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        if (os.path.isfile(canon) and (not name in exclude_names)):
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            size += align_up(os.path.getsize(canon), cluster_size)
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            size += align_up(os.path.getsize(canon), cluster_size)
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            files += 1
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            files += 1
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        if (os.path.isdir(canon)):
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        if (os.path.isdir(canon) and (not name in exclude_names)):
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            size += subtree_size(canon, cluster_size, dirent_size)
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            size += subtree_size(canon, cluster_size, dirent_size)
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            files += 1
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            files += 1
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    return size + align_up(files * dirent_size, cluster_size)
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    return size + align_up(files * dirent_size, cluster_size)
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        empty_cluster = 0
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        empty_cluster = 0
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    for name in os.listdir(root):
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    for name in os.listdir(root):
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        canon = os.path.join(root, name)
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        canon = os.path.join(root, name)
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        if (os.path.isfile(canon)):
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        if (os.path.isfile(canon) and (not name in exclude_names)):
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            rv = write_file(canon, outf, cluster_size, data_start, fat, reserved_clusters)
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            rv = write_file(canon, outf, cluster_size, data_start, fat, reserved_clusters)
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            directory.append(create_dirent(name, False, rv[0], rv[1]))
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            directory.append(create_dirent(name, False, rv[0], rv[1]))
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        if (os.path.isdir(canon)):
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        if (os.path.isdir(canon) and (not name in exclude_names)):
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            rv = recursion(False, canon, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, empty_cluster)
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            rv = recursion(False, canon, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, empty_cluster)
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            directory.append(create_dirent(name, True, rv[0], rv[1]))
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            directory.append(create_dirent(name, True, rv[0], rv[1]))
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    if (head):
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    if (head):
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        outf.seek(root_start)
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        outf.seek(root_start)
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    if (not os.path.isdir(path)):
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    if (not os.path.isdir(path)):
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        print "<PATH> must be a directory"
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        print "<PATH> must be a directory"
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        return
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        return
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    fat16_clusters = 4096
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    fat16_clusters = 4096
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    min_cluster_size = 1024
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    sector_size = 512
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    sector_size = 512
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    cluster_size = 4096
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    cluster_size = 4096
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    dirent_size = 32
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    dirent_size = 32
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    fatent_size = 2
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    fatent_size = 2
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    reserved_clusters = 2
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    reserved_clusters = 2
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    # Make sure the filesystem is large enought for FAT16
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    # Make sure the filesystem is large enought for FAT16
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    size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size
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    size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size
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    while (size / cluster_size < fat16_clusters):
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    while (size / cluster_size < fat16_clusters):
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        if (cluster_size > min_cluster_size):
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        if (cluster_size > sector_size):
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            cluster_size /= 2
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            cluster_size /= 2
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            size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size
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            size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size
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        else:
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        else:
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            size = fat16_clusters * cluster_size + reserved_clusters * cluster_size
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            size = fat16_clusters * cluster_size + reserved_clusters * cluster_size
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