Android Question Need help in converting c-Code to B4X

DonManfred

DonManfred

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for a friend in need to find a way to convert a C-Code.

C++: 
unsigned long CRC32_TALBLE[256] =
{
    0x0,0x77073096,0xEE0E612C,0x990951BA,0x76DC419,0x706AF48F,0xE963A535,0x9E6495A3,
    0xEDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,0x9B64C2B,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,
    0x76DC4190,0x1DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x6B6B51F,0x9FBFE4A5,0xE8B8D433,
    0x7807C9A2,0xF00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,0x86D3D2D,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,
    0xEDB88320,0x9ABFB3B6,0x3B6E20C,0x74B1D29A,0xEAD54739,0x9DD277AF,0x4DB2615,0x73DC1683,
    0xE3630B12,0x94643B84,0xD6D6A3E,0x7A6A5AA8,0xE40ECF0B,0x9309FF9D,0xA00AE27,0x7D079EB1,
    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,0x26D930A,0x9C0906A9,0xEB0E363F,0x72076785,0x5005713,
    0x95BF4A82,0xE2B87A14,0x7BB12BAE,0xCB61B38,0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0xBDBDF21,
    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
};

unsigned long CalculateBlockCRC32(  unsigned long ulCount, /* Number of bytes in the data block */
                                    unsigned char *ucBuffer ) /* Data block */
{
    unsigned long ulTemp1;
    unsigned long ulTemp2;
    unsigned long ulCRC = 0;
    while ( ulCount-- != 0 )
    {
        ulTemp1 = ( ulCRC >> 8 ) & 0x00FFFFFFL;
        ulTemp2 = CRC32_TALBLE[ ((int) ulCRC ^ *ucBuffer++ ) & 0xff ];
        ulCRC = ulTemp1 ^ ulTemp2;
    }
    return( ulCRC );
}

Can someone help on this? EyeRollingEmoji ;-)
 

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Star-Dust

Star-Dust

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try this
B4X: 
Private Sub FuncCRC(Data() As Byte)
    Dim J As JavaObject = Me
    Dim i As Long = J.RunMethod("calculateBlockCrc32_U",Array(Data.Length,Data))
    Log(i)
End Sub

#IF JAVA
import java.lang.Long;

public class DemoTranslation {
    public static long crc32Talble_U[256] = {
    0x0,0x77073096,0xEE0E612C,0x990951BA,0x76DC419,0x706AF48F,0xE963A535,0x9E6495A3,
    0xEDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,0x9B64C2B,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,
    0x76DC4190,0x1DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x6B6B51F,0x9FBFE4A5,0xE8B8D433,
    0x7807C9A2,0xF00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,0x86D3D2D,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,
    0xEDB88320,0x9ABFB3B6,0x3B6E20C,0x74B1D29A,0xEAD54739,0x9DD277AF,0x4DB2615,0x73DC1683,
    0xE3630B12,0x94643B84,0xD6D6A3E,0x7A6A5AA8,0xE40ECF0B,0x9309FF9D,0xA00AE27,0x7D079EB1,
    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,0x26D930A,0x9C0906A9,0xEB0E363F,0x72076785,0x5005713,
    0x95BF4A82,0xE2B87A14,0x7BB12BAE,0xCB61B38,0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0xBDBDF21,
    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
};

    public static long calculateBlockCrc32_U(long ulCount_U /* Number of bytes in the data block */, byte[] ucBuffer_U) /* Data block */ {
        int ucBufferIndex = 0;
        long ulTemp1_U;
        long ulTemp2_U;
        long ulCrc_U = 0;
        while(ulCount_U-- != 0) {
            ulTemp1_U = ulCrc_U >>> 8 & 0x00FFFFFFl;
            ulTemp2_U = crc32Talble_U[((int)ulCrc_U ^ Byte.toUnsignedInt(ucBuffer_U[ucBufferIndex++])) & 0xff];
            ulCrc_U = ulTemp1_U ^ ulTemp2_U;
        }
        return ulCrc_U;
    }
}
#End If
 
Upvote 0
JordiCP

JordiCP

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(oh, I'm late :))

Untested approach, we'd need a known result in order to check.
(Note code comments: that long vars in C are 4-byte, while in Java they are 8-byte. Due to the nature of the calculations in this case, this would not affect the result, only the container)
B4X: 
' Java ints are 32bits. In older machines (and related C-code), often 'long' was usually refered to a 32-bit variable, and 'int' to what we know as a 'short' (16-bit)
' Even if java's ints are signed and the original code deals with unsigned , here it does not matter since we are not performing arithmetic operations on them.
Sub CalculateBlockCRC32(ulCount As Int, ucBuffer() As Byte) As Int
    
    Dim CRC32_TABLE() As Int = Array As Int( _
    0x0,0x77073096,0xEE0E612C,0x990951BA,0x76DC419,0x706AF48F,0xE963A535,0x9E6495A3, _
    0xEDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,0x9B64C2B,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, _
    0x76DC4190,0x1DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x6B6B51F,0x9FBFE4A5,0xE8B8D433, _
    0x7807C9A2,0xF00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,0x86D3D2D,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, _
    0xEDB88320,0x9ABFB3B6,0x3B6E20C,0x74B1D29A,0xEAD54739,0x9DD277AF,0x4DB2615,0x73DC1683, _
    0xE3630B12,0x94643B84,0xD6D6A3E,0x7A6A5AA8,0xE40ECF0B,0x9309FF9D,0xA00AE27,0x7D079EB1, _
    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,0x26D930A,0x9C0906A9,0xEB0E363F,0x72076785,0x5005713, _
    0x95BF4A82,0xE2B87A14,0x7BB12BAE,0xCB61B38,0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0xBDBDF21, _
    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 _
    )
    Dim ulTemp1, ulTemp2 As Int
    Dim ulCRC As Int = 0
    For k=0 To ulCount-1
        ulTemp1 = Bit.UnsignedShiftRight( ulCRC, 8 )
        ulTemp2 = CRC32_TABLE( Bit.And( Bit.Xor(ulCRC, ucBuffer(k)), 0xFF) )
        ulCRC   = Bit.Xor( ulTemp1, ulTemp2)
    Next
    Return(ulCRC)
    
End Sub
 
Upvote 0
Star-Dust

Star-Dust

Expert
Licensed User
Longtime User
JordiCP said:
(oh, I'm late :))

Untested approach, we'd need a known result in order to check.
(Note code comments: that long vars in C are 4-byte, while in Java they are 8-byte. Due to the nature of the calculations in this case, this would not affect the result, only the container)
B4X: 
' Java ints are 32bits. In older machines (and related C-code), often 'long' was usually refered to a 32-bit variable, and 'int' to what we know as a 'short' (16-bit)
' Even if java's ints are signed and the original code deals with unsigned , here it does not matter since we are not performing arithmetic operations on them.
Sub CalculateBlockCRC32(ulCount As Int, ucBuffer() As Byte) As Int
   
    Dim CRC32_TABLE() As Int = Array As Int( _
    0x0,0x77073096,0xEE0E612C,0x990951BA,0x76DC419,0x706AF48F,0xE963A535,0x9E6495A3, _
    0xEDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,0x9B64C2B,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, _
    0x76DC4190,0x1DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x6B6B51F,0x9FBFE4A5,0xE8B8D433, _
    0x7807C9A2,0xF00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,0x86D3D2D,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, _
    0xEDB88320,0x9ABFB3B6,0x3B6E20C,0x74B1D29A,0xEAD54739,0x9DD277AF,0x4DB2615,0x73DC1683, _
    0xE3630B12,0x94643B84,0xD6D6A3E,0x7A6A5AA8,0xE40ECF0B,0x9309FF9D,0xA00AE27,0x7D079EB1, _
    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,0x26D930A,0x9C0906A9,0xEB0E363F,0x72076785,0x5005713, _
    0x95BF4A82,0xE2B87A14,0x7BB12BAE,0xCB61B38,0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0xBDBDF21, _
    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 _
    )
    Dim ulTemp1, ulTemp2 As Int
    Dim ulCRC As Int = 0
    For k=0 To ulCount-1
        ulTemp1 = Bit.UnsignedShiftRight( ulCRC, 8 )
        ulTemp2 = CRC32_TABLE( Bit.And( Bit.Xor(ulCRC, ucBuffer(k)), 0xFF) )
        ulCRC   = Bit.Xor( ulTemp1, ulTemp2)
    Next
    Return(ulCRC)
   
End Sub
Click to expand...
CRC32_TABLE int? no long?
 
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JordiCP

JordiCP

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Longtime User
Yes, 'int' size in Java is 4-byte and 'long' size in 'C' is 4-byte. Although as I commented, in this case it should not affect the result.
(Despite this, my approach may contain other errors ;))
 
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