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Add checksum routine.

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This commit is contained in:
David Given
2019-12-01 09:11:36 +01:00
parent eaa3c57425
commit d2f8c27cb6
1 changed files with 13 additions and 1 deletions
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14
arch/amiga/encoder.cc
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@@ -26,6 +26,18 @@ static int charToInt(char c)
return 10 + tolower(c) - 'a';
}
static uint32_t checksum(const Bytes& bytes)
{
ByteReader br(bytes);
uint32_t checksum = 0;
assert((bytes.size() & 3) == 0);
while (!br.eof())
checksum ^= br.read_be32();
return checksum & 0x55555555;
}
static void write_bits(std::vector<bool>& bits, unsigned& cursor, uint64_t data, int width)
{
cursor += width;
@@ -45,7 +57,7 @@ static void write_sector(std::vector<bool> bits, unsigned& cursor, const Sector*
Bytes header(4);
ByteWriter bw(header);
bw.write_8(0xff); /* Amiga 1.0 format byte */
bw.write_8(sector->logicalTrack);
bw.write_8((sector->logicalTrack<<1) | sector->logicalSide);
bw.write_8(sector->logicalSector);
bw.write_8(AMIGA_SECTORS_PER_TRACK - sector->logicalSector);
}