ext/cosmos/ext/crc/crc.c in cosmos-3.5.0 vs ext/cosmos/ext/crc/crc.c in cosmos-3.5.1
- old
+ new
@@ -1,341 +1,341 @@
-/*
-# Copyright 2014 Ball Aerospace & Technologies Corp.
-# All Rights Reserved.
-#
-# This program is free software; you can modify and/or redistribute it
-# under the terms of the GNU General Public License
-# as published by the Free Software Foundation; version 3 with
-# attribution addendums as found in the LICENSE.txt
-*/
-
-#include "ruby.h"
-#include "stdio.h"
-
-VALUE mCosmos;
-VALUE cCrc;
-VALUE cCrc16;
-VALUE cCrc32;
-VALUE cCrc64;
-
-static ID id_ivar_seed = 0;
-static ID id_ivar_xor = 0;
-static ID id_ivar_reflect = 0;
-static ID id_ivar_table = 0;
-
-static const unsigned char BIT_REVERSE_TABLE[] =
-{
- 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
- 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
- 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
- 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
- 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
- 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
- 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
- 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
- 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
- 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
- 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
- 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
- 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
- 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
- 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
- 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
-};
-
-/*
- * Bit Reverse an unsigned char
- */
-static unsigned char bit_reverse_8(unsigned char value)
-{
- return BIT_REVERSE_TABLE[value];
-}
-
-/*
- * Bit Reverse an unsigned short
- */
-static unsigned short bit_reverse_16(unsigned short value)
-{
- return (BIT_REVERSE_TABLE[value & 0xff] << 8) |
- (BIT_REVERSE_TABLE[(value >> 8) & 0xff]);
-}
-
-/*
- * Bit Reverse an unsigned int
- */
-static unsigned int bit_reverse_32(unsigned int value)
-{
- return (BIT_REVERSE_TABLE[value & 0xff] << 24) |
- (BIT_REVERSE_TABLE[(value >> 8) & 0xff] << 16) |
- (BIT_REVERSE_TABLE[(value >> 16) & 0xff] << 8) |
- (BIT_REVERSE_TABLE[(value >> 24) & 0xff]);
-}
-
-/*
- * Bit Reverse an unsigned long long
- */
-static unsigned long long bit_reverse_64(unsigned long long value)
-{
- return ((unsigned long long)BIT_REVERSE_TABLE[value & 0x00000000000000ffULL] << 56) |
- ((unsigned long long)BIT_REVERSE_TABLE[(value >> 8) & 0x00000000000000ffULL] << 48) |
- ((unsigned long long)BIT_REVERSE_TABLE[(value >> 16) & 0x00000000000000ffULL] << 40) |
- ((unsigned long long)BIT_REVERSE_TABLE[(value >> 24) & 0x00000000000000ffULL] << 32) |
- ((unsigned long long)BIT_REVERSE_TABLE[(value >> 32) & 0x00000000000000ffULL] << 24) |
- ((unsigned long long)BIT_REVERSE_TABLE[(value >> 40) & 0x00000000000000ffULL] << 16) |
- ((unsigned long long)BIT_REVERSE_TABLE[(value >> 48) & 0x00000000000000ffULL] << 8) |
- ((unsigned long long)BIT_REVERSE_TABLE[(value >> 56) & 0x00000000000000ffULL]);
-}
-
-/*
- * Calculate a 16-bit CRC
- */
-static VALUE crc16_calculate(int argc, VALUE* argv, VALUE self)
-{
- VALUE param_data = Qnil;
- VALUE param_seed = Qnil;
- unsigned char* data = NULL;
- unsigned short* table = NULL;
- int i = 0;
- long length = 0;
- unsigned short crc = 0;
-
- switch (argc)
- {
- case 1:
- Check_Type(argv[0], T_STRING);
- param_data = argv[0];
- param_seed = rb_ivar_get(self, id_ivar_seed);
- break;
- case 2:
- Check_Type(argv[0], T_STRING);
- param_data = argv[0];
- if (argv[1] == Qnil)
- {
- param_seed = rb_ivar_get(self, id_ivar_seed);
- }
- else
- {
- param_seed = argv[1];
- }
- break;
- default:
- /* Invalid number of arguments given */
- rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..2)", argc);
- break;
- };
-
- crc = NUM2UINT(param_seed);
- data = (unsigned char*) RSTRING_PTR(param_data);
- length = RSTRING_LEN(param_data);
- table = (unsigned short*) RSTRING_PTR(rb_ivar_get(self, id_ivar_table));
-
- if (RTEST(rb_ivar_get(self, id_ivar_reflect)))
- {
- for (i = 0; i < length; i++)
- {
- crc = (crc << 8) ^ table[(crc >> 8) ^ bit_reverse_8(data[i])];
- }
-
- if (RTEST(rb_ivar_get(self, id_ivar_xor)))
- {
- return UINT2NUM(bit_reverse_16(crc ^ 0xFFFF));
- }
- else
- {
- return UINT2NUM(bit_reverse_16(crc));
- }
- }
- else
- {
- for (i = 0; i < length; i++)
- {
- crc = (crc << 8) ^ table[(crc >> 8) ^ data[i]];
- }
-
- if (RTEST(rb_ivar_get(self, id_ivar_xor)))
- {
- return UINT2NUM(crc ^ 0xFFFF);
- }
- else
- {
- return UINT2NUM(crc);
- }
- }
-}
-
-/*
- * Calculate a 32-bit CRC
- */
-static VALUE crc32_calculate(int argc, VALUE* argv, VALUE self)
-{
- VALUE param_data = Qnil;
- VALUE param_seed = Qnil;
- unsigned char* data = NULL;
- unsigned int* table = NULL;
- int i = 0;
- long length = 0;
- unsigned int crc = 0;
-
- switch (argc)
- {
- case 1:
- Check_Type(argv[0], T_STRING);
- param_data = argv[0];
- param_seed = rb_ivar_get(self, id_ivar_seed);
- break;
- case 2:
- Check_Type(argv[0], T_STRING);
- param_data = argv[0];
- if (argv[1] == Qnil)
- {
- param_seed = rb_ivar_get(self, id_ivar_seed);
- }
- else
- {
- param_seed = argv[1];
- }
- break;
- default:
- /* Invalid number of arguments given */
- rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..2)", argc);
- break;
- };
-
- crc = NUM2UINT(param_seed);
- data = (unsigned char*) RSTRING_PTR(param_data);
- length = RSTRING_LEN(param_data);
- table = (unsigned int*) RSTRING_PTR(rb_ivar_get(self, id_ivar_table));
-
- if (RTEST(rb_ivar_get(self, id_ivar_reflect)))
- {
- for (i = 0; i < length; i++)
- {
- crc = (crc << 8) ^ table[((crc >> 24) ^ bit_reverse_8(data[i])) & 0x000000FF];
- }
-
- if (RTEST(rb_ivar_get(self, id_ivar_xor)))
- {
- return UINT2NUM(bit_reverse_32(crc ^ 0xFFFFFFFF));
- }
- else
- {
- return UINT2NUM(bit_reverse_32(crc));
- }
- }
- else
- {
- for (i = 0; i < length; i++)
- {
- crc = (crc << 8) ^ table[((crc >> 24) ^ data[i]) & 0x000000FF];
- }
-
- if (RTEST(rb_ivar_get(self, id_ivar_xor)))
- {
- return UINT2NUM(crc ^ 0xFFFFFFFF);
- }
- else
- {
- return UINT2NUM(crc);
- }
- }
-}
-
-/*
- * Calculate a 64-bit CRC
- */
-static VALUE crc64_calculate(int argc, VALUE* argv, VALUE self)
-{
- VALUE param_data = Qnil;
- VALUE param_seed = Qnil;
- unsigned char* data = NULL;
- unsigned long long* table = NULL;
- int i = 0;
- long length = 0;
- unsigned long long crc = 0;
-
- switch (argc)
- {
- case 1:
- Check_Type(argv[0], T_STRING);
- param_data = argv[0];
- param_seed = rb_ivar_get(self, id_ivar_seed);
- break;
- case 2:
- Check_Type(argv[0], T_STRING);
- param_data = argv[0];
- if (argv[1] == Qnil)
- {
- param_seed = rb_ivar_get(self, id_ivar_seed);
- }
- else
- {
- param_seed = argv[1];
- }
- break;
- default:
- /* Invalid number of arguments given */
- rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..2)", argc);
- break;
- };
-
- crc = NUM2ULL(param_seed);
- data = (unsigned char*) RSTRING_PTR(param_data);
- length = RSTRING_LEN(param_data);
- table = (unsigned long long*) RSTRING_PTR(rb_ivar_get(self, id_ivar_table));
-
- if (RTEST(rb_ivar_get(self, id_ivar_reflect)))
- {
- for (i = 0; i < length; i++)
- {
- crc = (crc << 8) ^ table[((crc >> 56) ^ bit_reverse_8(data[i])) & 0x00000000000000FFULL];
- }
-
- if (RTEST(rb_ivar_get(self, id_ivar_xor)))
- {
- return ULL2NUM(bit_reverse_64(crc ^ 0xFFFFFFFFFFFFFFFFULL));
- }
- else
- {
- return ULL2NUM(bit_reverse_64(crc));
- }
- }
- else
- {
- for (i = 0; i < length; i++)
- {
- crc = (crc << 8) ^ table[((crc >> 56) ^ data[i]) & 0x00000000000000FFULL];
- }
-
- if (RTEST(rb_ivar_get(self, id_ivar_xor)))
- {
- return ULL2NUM(crc ^ 0xFFFFFFFFFFFFFFFFULL);
- }
- else
- {
- return ULL2NUM(crc);
- }
- }
-}
-
-/*
- * Initialize methods for Crc
- */
-void Init_crc()
-{
- id_ivar_seed = rb_intern("@seed");
- id_ivar_xor = rb_intern("@xor");
- id_ivar_reflect = rb_intern("@reflect");
- id_ivar_table = rb_intern("@table");
-
- mCosmos = rb_define_module("Cosmos");
-
- cCrc = rb_define_class_under(mCosmos, "Crc", rb_cObject);
-
- cCrc16 = rb_define_class_under(mCosmos, "Crc16", cCrc);
- rb_define_method(cCrc16, "calc", crc16_calculate, -1);
-
- cCrc32 = rb_define_class_under(mCosmos, "Crc32", cCrc);
- rb_define_method(cCrc32, "calc", crc32_calculate, -1);
-
- cCrc64 = rb_define_class_under(mCosmos, "Crc64", cCrc);
- rb_define_method(cCrc64, "calc", crc64_calculate, -1);
-}
+/*
+# Copyright 2014 Ball Aerospace & Technologies Corp.
+# All Rights Reserved.
+#
+# This program is free software; you can modify and/or redistribute it
+# under the terms of the GNU General Public License
+# as published by the Free Software Foundation; version 3 with
+# attribution addendums as found in the LICENSE.txt
+*/
+
+#include "ruby.h"
+#include "stdio.h"
+
+VALUE mCosmos;
+VALUE cCrc;
+VALUE cCrc16;
+VALUE cCrc32;
+VALUE cCrc64;
+
+static ID id_ivar_seed = 0;
+static ID id_ivar_xor = 0;
+static ID id_ivar_reflect = 0;
+static ID id_ivar_table = 0;
+
+static const unsigned char BIT_REVERSE_TABLE[] =
+{
+ 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
+ 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
+ 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
+ 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
+ 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
+ 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
+ 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
+ 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
+ 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
+ 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
+ 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
+ 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
+ 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
+ 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
+ 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
+ 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
+};
+
+/*
+ * Bit Reverse an unsigned char
+ */
+static unsigned char bit_reverse_8(unsigned char value)
+{
+ return BIT_REVERSE_TABLE[value];
+}
+
+/*
+ * Bit Reverse an unsigned short
+ */
+static unsigned short bit_reverse_16(unsigned short value)
+{
+ return (BIT_REVERSE_TABLE[value & 0xff] << 8) |
+ (BIT_REVERSE_TABLE[(value >> 8) & 0xff]);
+}
+
+/*
+ * Bit Reverse an unsigned int
+ */
+static unsigned int bit_reverse_32(unsigned int value)
+{
+ return (BIT_REVERSE_TABLE[value & 0xff] << 24) |
+ (BIT_REVERSE_TABLE[(value >> 8) & 0xff] << 16) |
+ (BIT_REVERSE_TABLE[(value >> 16) & 0xff] << 8) |
+ (BIT_REVERSE_TABLE[(value >> 24) & 0xff]);
+}
+
+/*
+ * Bit Reverse an unsigned long long
+ */
+static unsigned long long bit_reverse_64(unsigned long long value)
+{
+ return ((unsigned long long)BIT_REVERSE_TABLE[value & 0x00000000000000ffULL] << 56) |
+ ((unsigned long long)BIT_REVERSE_TABLE[(value >> 8) & 0x00000000000000ffULL] << 48) |
+ ((unsigned long long)BIT_REVERSE_TABLE[(value >> 16) & 0x00000000000000ffULL] << 40) |
+ ((unsigned long long)BIT_REVERSE_TABLE[(value >> 24) & 0x00000000000000ffULL] << 32) |
+ ((unsigned long long)BIT_REVERSE_TABLE[(value >> 32) & 0x00000000000000ffULL] << 24) |
+ ((unsigned long long)BIT_REVERSE_TABLE[(value >> 40) & 0x00000000000000ffULL] << 16) |
+ ((unsigned long long)BIT_REVERSE_TABLE[(value >> 48) & 0x00000000000000ffULL] << 8) |
+ ((unsigned long long)BIT_REVERSE_TABLE[(value >> 56) & 0x00000000000000ffULL]);
+}
+
+/*
+ * Calculate a 16-bit CRC
+ */
+static VALUE crc16_calculate(int argc, VALUE* argv, VALUE self)
+{
+ VALUE param_data = Qnil;
+ VALUE param_seed = Qnil;
+ unsigned char* data = NULL;
+ unsigned short* table = NULL;
+ int i = 0;
+ long length = 0;
+ unsigned short crc = 0;
+
+ switch (argc)
+ {
+ case 1:
+ Check_Type(argv[0], T_STRING);
+ param_data = argv[0];
+ param_seed = rb_ivar_get(self, id_ivar_seed);
+ break;
+ case 2:
+ Check_Type(argv[0], T_STRING);
+ param_data = argv[0];
+ if (argv[1] == Qnil)
+ {
+ param_seed = rb_ivar_get(self, id_ivar_seed);
+ }
+ else
+ {
+ param_seed = argv[1];
+ }
+ break;
+ default:
+ /* Invalid number of arguments given */
+ rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..2)", argc);
+ break;
+ };
+
+ crc = NUM2UINT(param_seed);
+ data = (unsigned char*) RSTRING_PTR(param_data);
+ length = RSTRING_LEN(param_data);
+ table = (unsigned short*) RSTRING_PTR(rb_ivar_get(self, id_ivar_table));
+
+ if (RTEST(rb_ivar_get(self, id_ivar_reflect)))
+ {
+ for (i = 0; i < length; i++)
+ {
+ crc = (crc << 8) ^ table[(crc >> 8) ^ bit_reverse_8(data[i])];
+ }
+
+ if (RTEST(rb_ivar_get(self, id_ivar_xor)))
+ {
+ return UINT2NUM(bit_reverse_16(crc ^ 0xFFFF));
+ }
+ else
+ {
+ return UINT2NUM(bit_reverse_16(crc));
+ }
+ }
+ else
+ {
+ for (i = 0; i < length; i++)
+ {
+ crc = (crc << 8) ^ table[(crc >> 8) ^ data[i]];
+ }
+
+ if (RTEST(rb_ivar_get(self, id_ivar_xor)))
+ {
+ return UINT2NUM(crc ^ 0xFFFF);
+ }
+ else
+ {
+ return UINT2NUM(crc);
+ }
+ }
+}
+
+/*
+ * Calculate a 32-bit CRC
+ */
+static VALUE crc32_calculate(int argc, VALUE* argv, VALUE self)
+{
+ VALUE param_data = Qnil;
+ VALUE param_seed = Qnil;
+ unsigned char* data = NULL;
+ unsigned int* table = NULL;
+ int i = 0;
+ long length = 0;
+ unsigned int crc = 0;
+
+ switch (argc)
+ {
+ case 1:
+ Check_Type(argv[0], T_STRING);
+ param_data = argv[0];
+ param_seed = rb_ivar_get(self, id_ivar_seed);
+ break;
+ case 2:
+ Check_Type(argv[0], T_STRING);
+ param_data = argv[0];
+ if (argv[1] == Qnil)
+ {
+ param_seed = rb_ivar_get(self, id_ivar_seed);
+ }
+ else
+ {
+ param_seed = argv[1];
+ }
+ break;
+ default:
+ /* Invalid number of arguments given */
+ rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..2)", argc);
+ break;
+ };
+
+ crc = NUM2UINT(param_seed);
+ data = (unsigned char*) RSTRING_PTR(param_data);
+ length = RSTRING_LEN(param_data);
+ table = (unsigned int*) RSTRING_PTR(rb_ivar_get(self, id_ivar_table));
+
+ if (RTEST(rb_ivar_get(self, id_ivar_reflect)))
+ {
+ for (i = 0; i < length; i++)
+ {
+ crc = (crc << 8) ^ table[((crc >> 24) ^ bit_reverse_8(data[i])) & 0x000000FF];
+ }
+
+ if (RTEST(rb_ivar_get(self, id_ivar_xor)))
+ {
+ return UINT2NUM(bit_reverse_32(crc ^ 0xFFFFFFFF));
+ }
+ else
+ {
+ return UINT2NUM(bit_reverse_32(crc));
+ }
+ }
+ else
+ {
+ for (i = 0; i < length; i++)
+ {
+ crc = (crc << 8) ^ table[((crc >> 24) ^ data[i]) & 0x000000FF];
+ }
+
+ if (RTEST(rb_ivar_get(self, id_ivar_xor)))
+ {
+ return UINT2NUM(crc ^ 0xFFFFFFFF);
+ }
+ else
+ {
+ return UINT2NUM(crc);
+ }
+ }
+}
+
+/*
+ * Calculate a 64-bit CRC
+ */
+static VALUE crc64_calculate(int argc, VALUE* argv, VALUE self)
+{
+ VALUE param_data = Qnil;
+ VALUE param_seed = Qnil;
+ unsigned char* data = NULL;
+ unsigned long long* table = NULL;
+ int i = 0;
+ long length = 0;
+ unsigned long long crc = 0;
+
+ switch (argc)
+ {
+ case 1:
+ Check_Type(argv[0], T_STRING);
+ param_data = argv[0];
+ param_seed = rb_ivar_get(self, id_ivar_seed);
+ break;
+ case 2:
+ Check_Type(argv[0], T_STRING);
+ param_data = argv[0];
+ if (argv[1] == Qnil)
+ {
+ param_seed = rb_ivar_get(self, id_ivar_seed);
+ }
+ else
+ {
+ param_seed = argv[1];
+ }
+ break;
+ default:
+ /* Invalid number of arguments given */
+ rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..2)", argc);
+ break;
+ };
+
+ crc = NUM2ULL(param_seed);
+ data = (unsigned char*) RSTRING_PTR(param_data);
+ length = RSTRING_LEN(param_data);
+ table = (unsigned long long*) RSTRING_PTR(rb_ivar_get(self, id_ivar_table));
+
+ if (RTEST(rb_ivar_get(self, id_ivar_reflect)))
+ {
+ for (i = 0; i < length; i++)
+ {
+ crc = (crc << 8) ^ table[((crc >> 56) ^ bit_reverse_8(data[i])) & 0x00000000000000FFULL];
+ }
+
+ if (RTEST(rb_ivar_get(self, id_ivar_xor)))
+ {
+ return ULL2NUM(bit_reverse_64(crc ^ 0xFFFFFFFFFFFFFFFFULL));
+ }
+ else
+ {
+ return ULL2NUM(bit_reverse_64(crc));
+ }
+ }
+ else
+ {
+ for (i = 0; i < length; i++)
+ {
+ crc = (crc << 8) ^ table[((crc >> 56) ^ data[i]) & 0x00000000000000FFULL];
+ }
+
+ if (RTEST(rb_ivar_get(self, id_ivar_xor)))
+ {
+ return ULL2NUM(crc ^ 0xFFFFFFFFFFFFFFFFULL);
+ }
+ else
+ {
+ return ULL2NUM(crc);
+ }
+ }
+}
+
+/*
+ * Initialize methods for Crc
+ */
+void Init_crc()
+{
+ id_ivar_seed = rb_intern("@seed");
+ id_ivar_xor = rb_intern("@xor");
+ id_ivar_reflect = rb_intern("@reflect");
+ id_ivar_table = rb_intern("@table");
+
+ mCosmos = rb_define_module("Cosmos");
+
+ cCrc = rb_define_class_under(mCosmos, "Crc", rb_cObject);
+
+ cCrc16 = rb_define_class_under(mCosmos, "Crc16", cCrc);
+ rb_define_method(cCrc16, "calc", crc16_calculate, -1);
+
+ cCrc32 = rb_define_class_under(mCosmos, "Crc32", cCrc);
+ rb_define_method(cCrc32, "calc", crc32_calculate, -1);
+
+ cCrc64 = rb_define_class_under(mCosmos, "Crc64", cCrc);
+ rb_define_method(cCrc64, "calc", crc64_calculate, -1);
+}