| 48,7 → 48,7 |
|---|
| "Recursive directory walk and calculate size" |
| |
| size = 0 |
| files = 0 |
| files = 2 |
| |
| for name in os.listdir(root): |
| canon = os.path.join(root, name) |
| 68,21 → 68,19 |
|---|
| |
| return len(os.listdir(root)) |
| |
| def write_file(path, outf, cluster_size, data_start, fat): |
| def write_file(path, outf, cluster_size, data_start, fat, reserved_clusters): |
| "Store the contents of a file" |
| |
| size = os.path.getsize(path) |
| prev = -1 |
| first = -1 |
| first = 0 |
| |
| inf = file(path, "r") |
| rd = 0; |
| while (rd < size): |
| data = inf.read(cluster_size); |
| |
| empty_cluster = fat.index(0) |
| fat[empty_cluster] = 0xffff |
| |
| fat[empty_cluster] = 0xffff |
| if (prev != -1): |
| fat[prev] = empty_cluster |
| else: |
| 90,7 → 88,8 |
|---|
| |
| prev = empty_cluster |
| |
| outf.seek(data_start + empty_cluster * cluster_size) |
| data = inf.read(cluster_size); |
| outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
| outf.write(data) |
| rd += len(data) |
| inf.close() |
| 97,6 → 96,42 |
|---|
| |
| return first, size |
| |
| def write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster): |
| "Store the contents of a directory" |
| |
| length = len(directory) |
| size = length * dirent_size |
| prev = -1 |
| first = 0 |
| |
| i = 0 |
| rd = 0; |
| while (rd < size): |
| if (prev != -1): |
| empty_cluster = fat.index(0) |
| fat[empty_cluster] = 0xffff |
| fat[prev] = empty_cluster |
| else: |
| first = empty_cluster |
| |
| prev = empty_cluster |
| |
| data = '' |
| data_len = 0 |
| while ((i < length) and (data_len < cluster_size)): |
| if (i == 0): |
| directory[i].cluster = empty_cluster |
| |
| data += directory[i].pack() |
| data_len += dirent_size |
| i += 1 |
| |
| outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
| outf.write(data) |
| rd += len(data) |
| |
| return first, size |
| |
| DIR_ENTRY = """little: |
| char name[8] /* file name */ |
| char ext[3] /* file extension */ |
| 113,15 → 148,61 |
|---|
| uint32_t size /* file size */ |
| """ |
| |
| DOT_DIR_ENTRY = """little: |
| uint8_t signature /* 0x2e signature */ |
| char name[7] /* empty */ |
| char ext[3] /* empty */ |
| uint8_t attr /* file attributes */ |
| padding[1] /* reserved for NT */ |
| uint8_t ctime_fine /* create time (fine resolution) */ |
| uint16_t ctime /* create time */ |
| uint16_t cdate /* create date */ |
| uint16_t adate /* access date */ |
| padding[2] /* EA-index */ |
| uint16_t mtime /* modification time */ |
| uint16_t mdate /* modification date */ |
| uint16_t cluster /* first cluster */ |
| uint32_t size /* file size */ |
| """ |
| |
| DOTDOT_DIR_ENTRY = """little: |
| uint8_t signature[2] /* 0x2e signature */ |
| char name[6] /* empty */ |
| char ext[3] /* empty */ |
| uint8_t attr /* file attributes */ |
| padding[1] /* reserved for NT */ |
| uint8_t ctime_fine /* create time (fine resolution) */ |
| uint16_t ctime /* create time */ |
| uint16_t cdate /* create date */ |
| uint16_t adate /* access date */ |
| padding[2] /* EA-index */ |
| uint16_t mtime /* modification time */ |
| uint16_t mdate /* modification date */ |
| uint16_t cluster /* first cluster */ |
| uint32_t size /* file size */ |
| """ |
| |
| def mangle_fname(name): |
| # FIXME: filter illegal characters |
| fname = (name.split('.')[0] + ' ').upper()[0:8] |
| return fname |
| parts = name.split('.') |
| |
| if (len(parts) > 0): |
| fname = parts[0] |
| else: |
| fname = '' |
| |
| return (fname + ' ').upper()[0:8] |
| |
| def mangle_ext(name): |
| # FIXME: filter illegal characters |
| ext = (name.split('.')[1] + ' ').upper()[0:3] |
| return ext |
| parts = name.split('.') |
| |
| if (len(parts) > 1): |
| ext = parts[1] |
| else: |
| ext = '' |
| |
| return (ext + ' ').upper()[0:3] |
| |
| def create_dirent(name, directory, cluster, size): |
| dir_entry = xstruct.create(DIR_ENTRY) |
| 141,25 → 222,84 |
|---|
| dir_entry.mtime = 0 # FIXME |
| dir_entry.mdate = 0 # FIXME |
| dir_entry.cluster = cluster |
| dir_entry.size = size |
| |
| if (directory): |
| dir_entry.size = 0 |
| else: |
| dir_entry.size = size |
| |
| return dir_entry |
| |
| def recursion(head, root, outf, cluster_size, root_start, data_start, fat): |
| def create_dot_dirent(empty_cluster): |
| dir_entry = xstruct.create(DOT_DIR_ENTRY) |
| |
| dir_entry.signature = 0x2e |
| dir_entry.name = ' ' |
| dir_entry.ext = ' ' |
| dir_entry.attr = 0x10 |
| |
| dir_entry.ctime_fine = 0 # FIXME |
| dir_entry.ctime = 0 # FIXME |
| dir_entry.cdate = 0 # FIXME |
| dir_entry.adate = 0 # FIXME |
| dir_entry.mtime = 0 # FIXME |
| dir_entry.mdate = 0 # FIXME |
| dir_entry.cluster = empty_cluster |
| dir_entry.size = 0 |
| |
| return dir_entry |
| |
| def create_dotdot_dirent(parent_cluster): |
| dir_entry = xstruct.create(DOTDOT_DIR_ENTRY) |
| |
| dir_entry.signature = [0x2e, 0x2e] |
| dir_entry.name = ' ' |
| dir_entry.ext = ' ' |
| dir_entry.attr = 0x10 |
| |
| dir_entry.ctime_fine = 0 # FIXME |
| dir_entry.ctime = 0 # FIXME |
| dir_entry.cdate = 0 # FIXME |
| dir_entry.adate = 0 # FIXME |
| dir_entry.mtime = 0 # FIXME |
| dir_entry.mdate = 0 # FIXME |
| dir_entry.cluster = parent_cluster |
| dir_entry.size = 0 |
| |
| return dir_entry |
| |
| def recursion(head, root, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, parent_cluster): |
| "Recursive directory walk" |
| |
| directory = [] |
| |
| if (not head): |
| # Directory cluster preallocation |
| empty_cluster = fat.index(0) |
| fat[empty_cluster] = 0xffff |
| |
| directory.append(create_dot_dirent(empty_cluster)) |
| directory.append(create_dotdot_dirent(parent_cluster)) |
| else: |
| empty_cluster = 0 |
| |
| for name in os.listdir(root): |
| canon = os.path.join(root, name) |
| |
| if (os.path.isfile(canon)): |
| rv = write_file(canon, outf, cluster_size, data_start, fat) |
| rv = write_file(canon, outf, cluster_size, data_start, fat, reserved_clusters) |
| directory.append(create_dirent(name, False, rv[0], rv[1])) |
| |
| if (os.path.isdir(canon)): |
| rv = recursion(False, canon, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
| directory.append(create_dirent(name, True, rv[0], rv[1])) |
| |
| if (head): |
| outf.seek(root_start) |
| for dir_entry in directory: |
| outf.write(dir_entry.pack()) |
| else: |
| return write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
| |
| BOOT_SECTOR = """little: |
| uint8_t jmp[3] /* jump instruction */ |
| 211,6 → 351,7 |
|---|
| return |
| |
| fat16_clusters = 4096 |
| min_cluster_size = 1024 |
| |
| sector_size = 512 |
| cluster_size = 4096 |
| 222,7 → 363,7 |
|---|
| # Make sure the filesystem is large enought for FAT16 |
| size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
| while (size / cluster_size < fat16_clusters): |
| if (cluster_size > sector_size): |
| if (cluster_size > min_cluster_size): |
| cluster_size /= 2 |
| size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
| else: |
| 271,7 → 412,7 |
|---|
| |
| # FAT tables |
| for i in range(0, fat_count): |
| for j in range(0, boot_sector.fat_sectors): |
| for j in range(0, fat_size / sector_size): |
| outf.write(empty_sector.pack()) |
| |
| # Root directory |
| 286,7 → 427,7 |
|---|
| fat[0] = 0xfff8 |
| fat[1] = 0xffff |
| |
| recursion(True, path, outf, cluster_size, root_start, data_start, fat) |
| recursion(True, path, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, 0) |
| |
| # Store FAT |
| fat_entry = xstruct.create(FAT_ENTRY) |