Add CRC32C (Castagnoli) checksum support

.gitignore

@@ -1,3 +1,6 @@
+# Build directory
+build/
+
 # Prerequisites
 *.d
 

src/MultiuserFileSystem.cc

@@ -127,6 +127,9 @@ MultiuserFileSystem::Config(XrdSysLogger *lp, const char *configfn)
                 else if (!strcmp("crc32", val)) {
                     m_digests |= ChecksumManager::CRC32;
                 }
+                else if (!strcmp("crc32c", val)) {
+                    m_digests |= ChecksumManager::CRC32C;
+                }
                 else if (!strcmp("adler32", val)) {
                     m_digests |= ChecksumManager::ADLER32;
                 }

src/XrdChecksum.cc

@@ -45,6 +45,9 @@ ChecksumManager::Set(const char *lfn, const ChecksumState &state)
     if (state.Get(ChecksumManager::CRC32).size())
         retval = this->Set(lfn, "CRC32", state.Get(ChecksumManager::CRC32).c_str());
 
+    if (state.Get(ChecksumManager::CRC32C).size())
+        retval = this->Set(lfn, "CRC32C", state.Get(ChecksumManager::CRC32C).c_str());
+
     if (state.Get(ChecksumManager::MD5).size())
         retval = this->Set(lfn, "MD5", state.Get(ChecksumManager::MD5).c_str());
 
@@ -73,6 +76,10 @@ int        ChecksumManager::Calc( const char *lfn, XrdCksData &Cks, int doSet)
     {
         return_digest = ChecksumManager::CKSUM;
     }
+    else if (!strncasecmp(Cks.Name, "crc32c", Cks.NameSize))
+    {
+        return_digest = ChecksumManager::CRC32C;
+    }
     else if (!strncasecmp(Cks.Name, "crc32", Cks.NameSize))
     {
         return_digest = ChecksumManager::CRC32;
@@ -125,6 +132,9 @@ int        ChecksumManager::Calc( const char *lfn, XrdCksData &Cks, int doSet)
     case ChecksumManager::CRC32:
         checksum_value = state.Get(ChecksumManager::CRC32);
         break;
+    case ChecksumManager::CRC32C:
+        checksum_value = state.Get(ChecksumManager::CRC32C);
+        break;
     case ChecksumManager::MD5:
         checksum_value = state.Get(ChecksumManager::MD5);
         break;

src/XrdChecksum.hh

@@ -41,6 +41,7 @@ private:
     const unsigned m_digests;
     uint32_t m_cksum;
     uint32_t m_crc32;
+    uint32_t m_crc32c;
     uint32_t m_adler32;
 
     unsigned m_md5_length;
@@ -119,6 +120,7 @@ public:
         ADLER32 = 0x04,
         CVMFS   = 0x08,
         CRC32   = 0x10,
+        CRC32C  = 0x20,
         ALL     = 0xff
     };
 

src/XrdChecksumCalc.cc

@@ -77,6 +77,54 @@ static uint32_t const g_crctab[256] =
 };
 
 
+// CRC32C (Castagnoli) lookup table using polynomial 0x1EDC6F41
+static uint32_t const g_crc32c_tab[256] =
+{
+  0x00000000, 0xf26b8303, 0xe13b70f7, 0x1350f3f4, 0xc79a971f, 0x35f1141c,
+  0x26a1e7e8, 0xd4ca64eb, 0x8ad958cf, 0x78b2dbcc, 0x6be22838, 0x9989ab3b,
+  0x4d43cfd0, 0xbf284cd3, 0xac78bf27, 0x5e133c24, 0x105ec76f, 0xe235446c,
+  0xf165b798, 0x030e349b, 0xd7c45070, 0x25afd373, 0x36ff2087, 0xc494a384,
+  0x9a879fa0, 0x68ec1ca3, 0x7bbcef57, 0x89d76c54, 0x5d1d08bf, 0xaf768bbc,
+  0xbc267848, 0x4e4dfb4b, 0x20bd8ede, 0xd2d60ddd, 0xc186fe29, 0x33ed7d2a,
+  0xe72719c1, 0x154c9ac2, 0x061c6936, 0xf477ea35, 0xaa64d611, 0x580f5512,
+  0x4b5fa6e6, 0xb93425e5, 0x6dfe410e, 0x9f95c20d, 0x8cc531f9, 0x7eaeb2fa,
+  0x30e349b1, 0xc288cab2, 0xd1d83946, 0x23b3ba45, 0xf779deae, 0x05125dad,
+  0x1642ae59, 0xe4292d5a, 0xba3a117e, 0x4851927d, 0x5b016189, 0xa96ae28a,
+  0x7da08661, 0x8fcb0562, 0x9c9bf696, 0x6ef07595, 0x417b1dbc, 0xb3109ebf,
+  0xa0406d4b, 0x522bee48, 0x86e18aa3, 0x748a09a0, 0x67dafa54, 0x95b17957,
+  0xcba24573, 0x39c9c670, 0x2a993584, 0xd8f2b687, 0x0c38d26c, 0xfe53516f,
+  0xed03a29b, 0x1f682198, 0x5125dad3, 0xa34e59d0, 0xb01eaa24, 0x42752927,
+  0x96bf4dcc, 0x64d4cecf, 0x77843d3b, 0x85efbe38, 0xdbfc821c, 0x2997011f,
+  0x3ac7f2eb, 0xc8ac71e8, 0x1c661503, 0xee0d9600, 0xfd5d65f4, 0x0f36e6f7,
+  0x61c69362, 0x93ad1061, 0x80fde395, 0x72966096, 0xa65c047d, 0x5437877e,
+  0x4767748a, 0xb50cf789, 0xeb1fcbad, 0x197448ae, 0x0a24bb5a, 0xf84f3859,
+  0x2c855cb2, 0xdeeedfb1, 0xcdbe2c45, 0x3fd5af46, 0x7198540d, 0x83f3d70e,
+  0x90a324fa, 0x62c8a7f9, 0xb602c312, 0x44694011, 0x5739b3e5, 0xa55230e6,
+  0xfb410cc2, 0x092a8fc1, 0x1a7a7c35, 0xe811ff36, 0x3cdb9bdd, 0xceb018de,
+  0xdde0eb2a, 0x2f8b6829, 0x82f63b78, 0x709db87b, 0x63cd4b8f, 0x91a6c88c,
+  0x456cac67, 0xb7072f64, 0xa457dc90, 0x563c5f93, 0x082f63b7, 0xfa44e0b4,
+  0xe9141340, 0x1b7f9043, 0xcfb5f4a8, 0x3dde77ab, 0x2e8e845f, 0xdce5075c,
+  0x92a8fc17, 0x60c37f14, 0x73938ce0, 0x81f80fe3, 0x55326b08, 0xa759e80b,
+  0xb4091bff, 0x466298fc, 0x1871a4d8, 0xea1a27db, 0xf94ad42f, 0x0b21572c,
+  0xdfeb33c7, 0x2d80b0c4, 0x3ed04330, 0xccbbc033, 0xa24bb5a6, 0x502036a5,
+  0x4370c551, 0xb11b4652, 0x65d122b9, 0x97baa1ba, 0x84ea524e, 0x7681d14d,
+  0x2892ed69, 0xdaf96e6a, 0xc9a99d9e, 0x3bc21e9d, 0xef087a76, 0x1d63f975,
+  0x0e330a81, 0xfc588982, 0xb21572c9, 0x407ef1ca, 0x532e023e, 0xa145813d,
+  0x758fe5d6, 0x87e466d5, 0x94b49521, 0x66df1622, 0x38cc2a06, 0xcaa7a905,
+  0xd9f75af1, 0x2b9cd9f2, 0xff56bd19, 0x0d3d3e1a, 0x1e6dcdee, 0xec064eed,
+  0xc38d26c4, 0x31e6a5c7, 0x22b65633, 0xd0ddd530, 0x0417b1db, 0xf67c32d8,
+  0xe52cc12c, 0x1747422f, 0x49547e0b, 0xbb3ffd08, 0xa86f0efc, 0x5a048dff,
+  0x8ecee914, 0x7ca56a17, 0x6ff599e3, 0x9d9e1ae0, 0xd3d3e1ab, 0x21b862a8,
+  0x32e8915c, 0xc083125f, 0x144976b4, 0xe622f5b7, 0xf5720643, 0x07198540,
+  0x590ab964, 0xab613a67, 0xb831c993, 0x4a5a4a90, 0x9e902e7b, 0x6cfbad78,
+  0x7fab5e8c, 0x8dc0dd8f, 0xe330a81a, 0x115b2b19, 0x020bd8ed, 0xf0605bee,
+  0x24aa3f05, 0xd6c1bc06, 0xc5914ff2, 0x37faccf1, 0x69e9f0d5, 0x9b8273d6,
+  0x88d28022, 0x7ab90321, 0xae7367ca, 0x5c18e4c9, 0x4f48173d, 0xbd23943e,
+  0xf36e6f75, 0x0105ec76, 0x12551f82, 0xe03e9c81, 0x34f4f86a, 0xc69f7b69,
+  0xd5cf889d, 0x27a40b9e, 0x79b737ba, 0x8bdcb4b9, 0x988c474d, 0x6ae7c44e,
+  0xbe2da0a5, 0x4c4623a6, 0x5f16d052, 0xad7d5351
+};
+
 static std::string
 human_readable_evp(const unsigned char *evp, size_t length)
 {
@@ -96,6 +144,7 @@ ChecksumState::ChecksumState(unsigned digests)
     : m_digests(digests),
       m_cksum(0),
       m_crc32(crc32(0, NULL, 0)),
+      m_crc32c(0xFFFFFFFF),
       m_adler32(adler32(0, NULL, 0)),
       m_md5_length(0),
       m_cur_chunk_bytes(0),
@@ -150,6 +199,11 @@ ChecksumState::Get(unsigned digest) const
         uint32_t crc32_no = htonl(m_crc32);
         return human_readable_evp(reinterpret_cast<unsigned char *>(&crc32_no), sizeof(crc32_no));
     }
+    if ((digest & ChecksumManager::CRC32C) && (m_digests & ChecksumManager::CRC32C))
+    {
+        uint32_t crc32c_no = htonl(m_crc32c);
+        return human_readable_evp(reinterpret_cast<unsigned char *>(&crc32c_no), sizeof(crc32c_no));
+    }
     if ((digest & ChecksumManager::ADLER32) && (m_digests & ChecksumManager::ADLER32))
     {
         uint32_t adler32_no = htonl(m_adler32);
@@ -189,6 +243,16 @@ ChecksumState::Update(const unsigned char *buffer, size_t bsize)
     {
         m_crc32 = crc32(m_crc32, buffer, bsize);
     }
+    if (m_digests & ChecksumManager::CRC32C)
+    {
+        const unsigned char *current_buffer = buffer;
+        size_t bytes_remaining = bsize;
+        uint32_t crc = m_crc32c;
+        while (bytes_remaining--) {
+            crc = (crc >> 8) ^ g_crc32c_tab[(crc ^ *current_buffer++) & 0xFF];
+        }
+        m_crc32c = crc;
+    }
     if (m_digests & ChecksumManager::MD5)
     {
         EVP_DigestUpdate(m_md5, buffer, bsize);
@@ -244,6 +308,10 @@ ChecksumState::Finalize()
         }
         m_cksum = ~crc;
     }
+    if (m_digests & ChecksumManager::CRC32C)
+    {
+        m_crc32c ^= 0xFFFFFFFF;
+    }
     if (m_digests & ChecksumManager::CVMFS)
     {
         unsigned char sha1_value[EVP_MAX_MD_SIZE];