26 lines
1.2 KiB
Python
26 lines
1.2 KiB
Python
# Setting the block hash
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if msg.sender == 2**160 - 2:
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with prev_block_number = block.number - 1:
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# Use storage fields 0..255 to store the last 256 hashes
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~sstore(prev_block_number % 256, ~calldataload(0))
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# Use storage fields 256..511 to store the hashes of the last 256
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# blocks with block.number % 256 == 0
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if not (prev_block_number % 256):
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~sstore(256 + (prev_block_number / 256) % 256, ~calldataload(0))
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# Use storage fields 512..767 to store the hashes of the last 256
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# blocks with block.number % 65536 == 0
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if not (prev_block_number % 65536):
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~sstore(512 + (prev_block_number / 65536) % 256, ~calldataload(0))
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# Getting the block hash
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else:
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if ~calldataload(0) >= block.number:
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return(0)
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elif block.number - ~calldataload(0) <= 256:
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return(~sload(~calldataload(0) % 256))
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elif (not (~calldataload(0) % 256) and block.number - ~calldataload(0) <= 65536):
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return(~sload(256 + (~calldataload(0) / 256) % 256))
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elif (not (~calldataload(0) % 65536) and block.number - ~calldataload(0) <= 16777216):
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return(~sload(512 + (~calldataload(0) / 65536) % 256))
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else:
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return(~calldataload(0) % 256 == 0)
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