69 lines
2.2 KiB
Nim
69 lines
2.2 KiB
Nim
# Fluffy
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# Copyright (c) 2023-2024 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [].}
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import stew/ptrops, stint, sqlite3_abi, eth/db/kvstore_sqlite3
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func xorDistance(a: openArray[byte], b: openArray[byte]): seq[byte] =
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doAssert(a.len == b.len)
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let length = a.len
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var distance: seq[byte] = newSeqUninitialized[byte](length)
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for i in 0 ..< length:
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distance[i] = a[i] xor b[i]
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return distance
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proc xorDistance*(
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ctx: SqliteContext, n: cint, v: SqliteValue
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) {.cdecl, gcsafe, raises: [].} =
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doAssert(n == 2)
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let
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ptrs = makeUncheckedArray(v)
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blob1Len = sqlite3_value_bytes(ptrs[][0])
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blob2Len = sqlite3_value_bytes(ptrs[][1])
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bytes = xorDistance(
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makeOpenArray(sqlite3_value_blob(ptrs[][0]), byte, blob1Len),
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makeOpenArray(sqlite3_value_blob(ptrs[][1]), byte, blob2Len),
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)
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sqlite3_result_blob(ctx, baseAddr bytes, cint bytes.len, SQLITE_TRANSIENT)
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func isInRadius(contentId: UInt256, localId: UInt256, radius: UInt256): bool =
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let distance = contentId xor localId
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radius > distance
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func isInRadius*(
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ctx: SqliteContext, n: cint, v: SqliteValue
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) {.cdecl, gcsafe, raises: [].} =
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doAssert(n == 3)
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let
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ptrs = makeUncheckedArray(v)
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blob1Len = sqlite3_value_bytes(ptrs[][0])
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blob2Len = sqlite3_value_bytes(ptrs[][1])
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blob3Len = sqlite3_value_bytes(ptrs[][2])
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doAssert(blob1Len == 32 and blob2Len == 32 and blob3Len == 32)
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let
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localId =
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UInt256.fromBytesBE(makeOpenArray(sqlite3_value_blob(ptrs[][0]), byte, blob1Len))
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contentId =
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UInt256.fromBytesBE(makeOpenArray(sqlite3_value_blob(ptrs[][1]), byte, blob2Len))
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radius =
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UInt256.fromBytesBE(makeOpenArray(sqlite3_value_blob(ptrs[][2]), byte, blob3Len))
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if isInRadius(contentId, localId, radius):
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ctx.sqlite3_result_int(cint 1)
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else:
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ctx.sqlite3_result_int(cint 0)
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