def write_rr(version, host_os, volume, rr_count):
prot_size = volume.tell()
(rr_crcs, rr_sects) = rr_calc(volume, rr_count, prot_size)
crc = crc32(rr_crcs, RR_CRC_INIT)
for s in rr_sects:
crc = crc32(s.buffer(), crc)
prot_sect_count = len(rr_crcs) // S_SHORT.size
size = prot_sect_count * RR_CRC_SIZE + rr_count * RR_SECT_SIZE
if version < 3:
write_block(volume,
type=RAR_BLOCK_OLD_RECOVERY,
flags=RAR_LONG_BLOCK ^ RAR_SKIP_IF_UNKNOWN,
data=(
S_LONG.pack(size),
(20,),
S_SHORT.pack(rr_count),
S_LONG.pack(prot_sect_count),
RR_PROTECT_2,
))
else:
write_block(volume,
type=RAR_BLOCK_SUB,
flags=RAR_LONG_BLOCK ^ RAR_SKIP_IF_UNKNOWN,
data=(
S_FILE_HDR.pack(size, size, host_os, crc, 0, 29, ord("0"),
len(RR_SUB_NAME), 0),
RR_SUB_NAME,
RR_PROTECT_3,
S_LONG.pack(rr_count),
struct.pack("<Q", prot_sect_count),
))
volume.write(rr_crcs)
for s in rr_sects:
volume.write(s.buffer())
def write_rr(version, host_os, volume, rr_count):
prot_size = volume.tell()
(rr_crcs, rr_sects) = rr_calc(volume, rr_count, prot_size)
crc = crc32(rr_crcs, RR_CRC_INIT)
for s in rr_sects:
crc = crc32(s.buffer(), crc)
prot_sect_count = len(rr_crcs) // S_SHORT.size
size = prot_sect_count * RR_CRC_SIZE + rr_count * RR_SECT_SIZE
if version < 3:
write_block(volume,
type=RAR_BLOCK_OLD_RECOVERY,
flags=RAR_LONG_BLOCK ^ RAR_SKIP_IF_UNKNOWN,
data=(
S_LONG.pack(size),
(20, ),
S_SHORT.pack(rr_count),
S_LONG.pack(prot_sect_count),
RR_PROTECT_2,
))
else:
write_block(volume,
type=RAR_BLOCK_SUB,
flags=RAR_LONG_BLOCK ^ RAR_SKIP_IF_UNKNOWN,
data=(
S_FILE_HDR.pack(size, size, host_os, crc, 0, 29,
ord("0"), len(RR_SUB_NAME), 0),
RR_SUB_NAME,
RR_PROTECT_3,
S_LONG.pack(rr_count),
struct.pack("<Q", prot_sect_count),
))
volume.write(rr_crcs)
for s in rr_sects:
volume.write(s.buffer())
def write_end(volume, version, flags, volnum, is_last_vol):
size = volume.tell()
volume.seek(0)
crc = file_crc32(volume, size)
if version >= 3:
flags |= (RAR_SKIP_IF_UNKNOWN ^
(not is_last_vol) * RAR_ENDARC_NEXT_VOLUME)
parts = list()
if flags & RAR_ENDARC_DATACRC:
parts.append(S_LONG.pack(crc))
if flags & RAR_ENDARC_VOLNR:
parts.append(S_SHORT.pack(volnum))
if flags & RAR_ENDARC_REVSPACE:
parts.append(0 for i in range(END_EXTRA))
write_block(volume, RAR_BLOCK_ENDARC, flags, parts)
return crc
def write_end(volume, version, flags, volnum, is_last_vol):
size = volume.tell()
volume.seek(0)
crc = file_crc32(volume, size)
if version >= 3:
flags |= (RAR_SKIP_IF_UNKNOWN ^
(not is_last_vol) * RAR_ENDARC_NEXT_VOLUME)
parts = list()
if flags & RAR_ENDARC_DATACRC:
parts.append(S_LONG.pack(crc))
if flags & RAR_ENDARC_VOLNR:
parts.append(S_SHORT.pack(volnum))
if flags & RAR_ENDARC_REVSPACE:
parts.append(0 for _ in range(END_EXTRA))
write_block(volume, RAR_BLOCK_ENDARC, flags, parts)
return crc
