scripts: add CFE Partition Tags support

Some BCM63xx NAND devices require a specific JFFS2 partition tag to verify
the JFFS2 partition validity:
	u32 part_id;
	u32 part_size;
	u16 flags;
	char part_name[33];
	char part_version[21];
	u32 part_crc32;

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

diff --git a/scripts/cfe-partition-tag.py b/scripts/cfe-partition-tag.py
new file mode 100755 (executable)
index 0000000..a2605d5
--- /dev/null
+++ b/scripts/cfe-partition-tag.py
@@ -0,0 +1,191 @@
+#!/usr/bin/env python3
+
+"""
+CFE Partition Tag
+
+{
+       u32 part_id;
+       u32 part_size;
+       u16 flags;
+       char part_name[33];
+       char part_version[21];
+       u32 part_crc32;
+}
+
+"""
+
+import argparse
+import os
+import struct
+
+PART_NAME_SIZE = 33
+PART_VERSION_SIZE = 21
+
+CRC32_INIT = 0xFFFFFFFF
+CRC32_TABLE = [
+       0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
+       0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
+       0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
+       0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
+       0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
+       0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+       0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
+       0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
+       0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
+       0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
+       0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
+       0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+       0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
+       0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
+       0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
+       0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
+       0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
+       0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+       0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
+       0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
+       0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
+       0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
+       0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
+       0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+       0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
+       0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
+       0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
+       0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
+       0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
+       0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+       0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
+       0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
+       0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
+       0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
+       0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
+       0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+       0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
+       0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
+       0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
+       0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
+       0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
+       0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+       0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
+       0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
+       0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
+       0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
+       0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
+       0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+       0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
+       0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
+       0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
+       0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
+       0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
+       0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+       0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
+       0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
+       0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
+       0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
+       0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
+       0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+       0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
+       0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
+       0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
+       0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
+]
+
+def auto_int(x):
+       return int(x, 0)
+
+def crc32(bytes, size, crc):
+       i = 0
+       while (i < size):
+               crc = (crc >> 8) ^ CRC32_TABLE[(crc ^ bytes[i]) & 0xff]
+               i += 1
+       return crc
+
+def str_to_bytes_pad(string, size):
+       str_bytes = string.encode()
+       num_bytes = len(str_bytes)
+       if (num_bytes >= size):
+               str_bytes = str_bytes[:size - 1] + '\0'.encode()
+       else:
+               str_bytes += '\0'.encode() * (size - num_bytes)
+       return str_bytes
+
+def create_tag(args, in_bytes, size):
+       crc = crc32(in_bytes, size, CRC32_INIT)
+
+       tag = bytearray()
+       tag += struct.pack('>I', args.part_id)
+       tag += struct.pack('>I', size)
+       tag += struct.pack('>H', args.part_flags)
+       tag += str_to_bytes_pad(args.part_name, PART_NAME_SIZE)
+       tag += str_to_bytes_pad(args.part_version, PART_VERSION_SIZE)
+       tag += struct.pack('>I', crc)
+
+       return tag
+
+def create_output(args):
+       in_st = os.stat(args.input_file)
+       in_size = in_st.st_size
+
+       in_f = open(args.input_file, 'r+b')
+       in_bytes = in_f.read(in_size)
+       in_f.close()
+
+       tag = create_tag(args, in_bytes, in_size)
+
+       out_f = open(args.output_file, 'w+b')
+       out_f.write(tag)
+       out_f.close()
+
+def main():
+       global args
+
+       parser = argparse.ArgumentParser(description='')
+
+       parser.add_argument('--flags',
+               dest='part_flags',
+               action='store',
+               type=auto_int,
+               help='Partition Flags')
+
+       parser.add_argument('--id',
+               dest='part_id',
+               action='store',
+               type=auto_int,
+               help='Partition ID')
+
+       parser.add_argument('--input-file',
+               dest='input_file',
+               action='store',
+               type=str,
+               help='Input file')
+
+       parser.add_argument('--output-file',
+               dest='output_file',
+               action='store',
+               type=str,
+               help='Output file')
+
+       parser.add_argument('--name',
+               dest='part_name',
+               action='store',
+               type=str,
+               help='Partition Name')
+
+       parser.add_argument('--version',
+               dest='part_version',
+               action='store',
+               type=str,
+               help='Partition Version')
+
+       args = parser.parse_args()
+
+       if ((not args.part_flags) or
+           (not args.part_id) or
+           (not args.input_file) or
+           (not args.output_file) or
+           (not args.part_name) or
+           (not args.part_version)):
+               parser.print_help()
+       else:
+               create_output(args)
+
+main()