libAthena
/
athena
mirror of https://github.com/libAthena/athena.git
2
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Return seed when given invalid data, re-order and rename parameters to make more sense

This commit is contained in:
Phillip Stephens 2018-02-15 17:07:50 -08:00
parent 5126c603b0
commit 80008cadcd
2 changed files with 20 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/athena/Checksums.hpp
View File

@ -5,9 +5,9 @@
namespace athena::Checksums
{
atUint64 crc64(const atUint8* data, atUint64 length, atUint64 mask = 0xFFFFFFFFFFFFFFFF, atUint64 seed = 0xFFFFFFFFFFFFFFFF);
atUint32 crc32(const atUint8* data, atUint64 length, atUint32 mask = 0xFFFFFFFF, atUint32 seed = 0xFFFFFFFF);
atUint64 crc64(const atUint8* data, atUint64 length, atUint64 seed = 0xFFFFFFFFFFFFFFFF, atUint64 final = 0xFFFFFFFFFFFFFFFF);
atUint32 crc32(const atUint8* data, atUint64 length, atUint32 seed = 0xFFFFFFFF, atUint32 final = 0xFFFFFFFF);
atUint16 crc16CCITT(const atUint8* data, atUint64 length, atUint16 seed = 0xFFFF, atUint16 final = 0);
atUint16 crc16(const atUint8* data, atUint64 length);
atUint16 crc16(const atUint8* data, atUint64 length, atUint16 seed = 0, atUint16 final = 0);
}
#endif // CHECKSUMS_HPP

31
src/athena/Checksums.cpp
View File

@ -5,14 +5,8 @@
namespace athena::Checksums
{
atUint64 crc64(const atUint8* data, atUint64 length, atUint64 mask, atUint64 seed)
atUint64 crc64(const atUint8* data, atUint64 length, atUint64 seed, atUint64 final)
{
if (!data)
return 0;
atUint64 checksum = seed;
int pos = 0;
static const atUint64 crc64Table[256] =
{
0x0000000000000000, 0x42F0E1EBA9EA3693, 0x85E1C3D753D46D26, 0xC711223CFA3E5BB5,
@ -81,13 +75,19 @@ atUint64 crc64(const atUint8* data, atUint64 length, atUint64 mask, atUint64 see
0x5DEDC41A34BBEEB2, 0x1F1D25F19D51D821, 0xD80C07CD676F8394, 0x9AFCE626CE85B507,
};
if (!data)
return seed;
atUint64 checksum = seed;
int pos = 0;
while (length--)
checksum = crc64Table[((checksum >> 56) ^ data[pos++]) & 0xff] ^ (checksum << 8);
return checksum ^ mask;
return checksum ^ final;
}
atUint32 crc32(const atUint8* data, atUint64 length, atUint32 mask, atUint32 seed)
atUint32 crc32(const atUint8* data, atUint64 length, atUint32 seed, atUint32 final)
{
static const atUint32 crc32Table[256] =
{
@ -126,7 +126,7 @@ atUint32 crc32(const atUint8* data, atUint64 length, atUint32 mask, atUint32 see
};
if (!data)
return 0;
return seed;
atUint32 checksum = seed;
int pos = 0;
@ -134,7 +134,7 @@ atUint32 crc32(const atUint8* data, atUint64 length, atUint32 mask, atUint32 see
while (length--)
checksum = (checksum >> 8) ^ crc32Table[(checksum & 0xFF) ^ data[pos++]];
return checksum ^ mask;
return checksum ^ final;
}
atUint16 crc16CCITT(const atUint8* data, atUint64 length, atUint16 seed, atUint16 final)
@ -181,8 +181,11 @@ atUint16 crc16CCITT(const atUint8* data, atUint64 length, atUint16 seed, atUint1
return checksum ^ final;
}
atUint16 crc16(const atUint8* data, atUint64 length)
atUint16 crc16(const atUint8* data, atUint64 length, atUint16 seed, atUint64 final)
{
if (data)
return seed;
static const atUint16 crc16Table[256] =
{
0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
@ -220,12 +223,12 @@ atUint16 crc16(const atUint8* data, atUint64 length)
};
atInt32 pos = 0;
atUint16 checksum = 0;
atUint16 checksum = seed;
while (length--)
checksum = (crc16Table[(checksum ^ data[pos++]) & 0xFF] ^ (checksum >> 8));
return checksum;
return checksum ^ final;
}
} // Checksums