btrfs-progs: image: add reverse CRC32C table

The table will be used to speed up calculations of CRC32C collisions.

Author: Piotr Pawlow <pp@siedziba.pl>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/image/main.c b/image/main.c
index e59271e..378a0d4 100644 (file)
--- a/image/main.c
+++ b/image/main.c
@@ -338,6 +338,75 @@ static u64 logical_to_physical(struct mdrestore_struct *mdres, u64 logical,
        return fs_chunk->physical + offset;
 }
 
+/*
+ * Reverse CRC-32C table
+ */
+static const u32 crc32c_rev_table[256] = {
+       0x00000000L,0x05EC76F1L,0x0BD8EDE2L,0x0E349B13L,
+       0x17B1DBC4L,0x125DAD35L,0x1C693626L,0x198540D7L,
+       0x2F63B788L,0x2A8FC179L,0x24BB5A6AL,0x21572C9BL,
+       0x38D26C4CL,0x3D3E1ABDL,0x330A81AEL,0x36E6F75FL,
+       0x5EC76F10L,0x5B2B19E1L,0x551F82F2L,0x50F3F403L,
+       0x4976B4D4L,0x4C9AC225L,0x42AE5936L,0x47422FC7L,
+       0x71A4D898L,0x7448AE69L,0x7A7C357AL,0x7F90438BL,
+       0x6615035CL,0x63F975ADL,0x6DCDEEBEL,0x6821984FL,
+       0xBD8EDE20L,0xB862A8D1L,0xB65633C2L,0xB3BA4533L,
+       0xAA3F05E4L,0xAFD37315L,0xA1E7E806L,0xA40B9EF7L,
+       0x92ED69A8L,0x97011F59L,0x9935844AL,0x9CD9F2BBL,
+       0x855CB26CL,0x80B0C49DL,0x8E845F8EL,0x8B68297FL,
+       0xE349B130L,0xE6A5C7C1L,0xE8915CD2L,0xED7D2A23L,
+       0xF4F86AF4L,0xF1141C05L,0xFF208716L,0xFACCF1E7L,
+       0xCC2A06B8L,0xC9C67049L,0xC7F2EB5AL,0xC21E9DABL,
+       0xDB9BDD7CL,0xDE77AB8DL,0xD043309EL,0xD5AF466FL,
+       0x7EF1CAB1L,0x7B1DBC40L,0x75292753L,0x70C551A2L,
+       0x69401175L,0x6CAC6784L,0x6298FC97L,0x67748A66L,
+       0x51927D39L,0x547E0BC8L,0x5A4A90DBL,0x5FA6E62AL,
+       0x4623A6FDL,0x43CFD00CL,0x4DFB4B1FL,0x48173DEEL,
+       0x2036A5A1L,0x25DAD350L,0x2BEE4843L,0x2E023EB2L,
+       0x37877E65L,0x326B0894L,0x3C5F9387L,0x39B3E576L,
+       0x0F551229L,0x0AB964D8L,0x048DFFCBL,0x0161893AL,
+       0x18E4C9EDL,0x1D08BF1CL,0x133C240FL,0x16D052FEL,
+       0xC37F1491L,0xC6936260L,0xC8A7F973L,0xCD4B8F82L,
+       0xD4CECF55L,0xD122B9A4L,0xDF1622B7L,0xDAFA5446L,
+       0xEC1CA319L,0xE9F0D5E8L,0xE7C44EFBL,0xE228380AL,
+       0xFBAD78DDL,0xFE410E2CL,0xF075953FL,0xF599E3CEL,
+       0x9DB87B81L,0x98540D70L,0x96609663L,0x938CE092L,
+       0x8A09A045L,0x8FE5D6B4L,0x81D14DA7L,0x843D3B56L,
+       0xB2DBCC09L,0xB737BAF8L,0xB90321EBL,0xBCEF571AL,
+       0xA56A17CDL,0xA086613CL,0xAEB2FA2FL,0xAB5E8CDEL,
+       0xFDE39562L,0xF80FE393L,0xF63B7880L,0xF3D70E71L,
+       0xEA524EA6L,0xEFBE3857L,0xE18AA344L,0xE466D5B5L,
+       0xD28022EAL,0xD76C541BL,0xD958CF08L,0xDCB4B9F9L,
+       0xC531F92EL,0xC0DD8FDFL,0xCEE914CCL,0xCB05623DL,
+       0xA324FA72L,0xA6C88C83L,0xA8FC1790L,0xAD106161L,
+       0xB49521B6L,0xB1795747L,0xBF4DCC54L,0xBAA1BAA5L,
+       0x8C474DFAL,0x89AB3B0BL,0x879FA018L,0x8273D6E9L,
+       0x9BF6963EL,0x9E1AE0CFL,0x902E7BDCL,0x95C20D2DL,
+       0x406D4B42L,0x45813DB3L,0x4BB5A6A0L,0x4E59D051L,
+       0x57DC9086L,0x5230E677L,0x5C047D64L,0x59E80B95L,
+       0x6F0EFCCAL,0x6AE28A3BL,0x64D61128L,0x613A67D9L,
+       0x78BF270EL,0x7D5351FFL,0x7367CAECL,0x768BBC1DL,
+       0x1EAA2452L,0x1B4652A3L,0x1572C9B0L,0x109EBF41L,
+       0x091BFF96L,0x0CF78967L,0x02C31274L,0x072F6485L,
+       0x31C993DAL,0x3425E52BL,0x3A117E38L,0x3FFD08C9L,
+       0x2678481EL,0x23943EEFL,0x2DA0A5FCL,0x284CD30DL,
+       0x83125FD3L,0x86FE2922L,0x88CAB231L,0x8D26C4C0L,
+       0x94A38417L,0x914FF2E6L,0x9F7B69F5L,0x9A971F04L,
+       0xAC71E85BL,0xA99D9EAAL,0xA7A905B9L,0xA2457348L,
+       0xBBC0339FL,0xBE2C456EL,0xB018DE7DL,0xB5F4A88CL,
+       0xDDD530C3L,0xD8394632L,0xD60DDD21L,0xD3E1ABD0L,
+       0xCA64EB07L,0xCF889DF6L,0xC1BC06E5L,0xC4507014L,
+       0xF2B6874BL,0xF75AF1BAL,0xF96E6AA9L,0xFC821C58L,
+       0xE5075C8FL,0xE0EB2A7EL,0xEEDFB16DL,0xEB33C79CL,
+       0x3E9C81F3L,0x3B70F702L,0x35446C11L,0x30A81AE0L,
+       0x292D5A37L,0x2CC12CC6L,0x22F5B7D5L,0x2719C124L,
+       0x11FF367BL,0x1413408AL,0x1A27DB99L,0x1FCBAD68L,
+       0x064EEDBFL,0x03A29B4EL,0x0D96005DL,0x087A76ACL,
+       0x605BEEE3L,0x65B79812L,0x6B830301L,0x6E6F75F0L,
+       0x77EA3527L,0x720643D6L,0x7C32D8C5L,0x79DEAE34L,
+       0x4F38596BL,0x4AD42F9AL,0x44E0B489L,0x410CC278L,
+       0x588982AFL,0x5D65F45EL,0x53516F4DL,0x56BD19BCL
+};
 
 static int find_collision_brute_force(struct name *val, u32 name_len)
 {