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chore: Outline C.memcpy method #268

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Merged
garyschulte merged 1 commit into from
Apr 28, 2025
+16 −2
Merged

chore: Outline C.memcpy method #268

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18 changes: 16 additions & 2 deletions gnark/gnark-jni/gnark-eip-2537.go
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Original file line number Diff line number Diff line change
Expand Up @@ -833,7 +833,14 @@ func nonMontgomeryMarshal(xVal, yVal *fp.Element, output *C.char, outputOffset i

if xLen > 0 {
// Copy x to output at offset (64 - xLen)
C.memcpy(unsafe.Pointer(uintptr(unsafe.Pointer(output))+uintptr(outputOffset+64-xLen)), unsafe.Pointer(&xBytes[0]), C.size_t(xLen))

// Calculate source and destination addresses
srcPtr := unsafe.Pointer(&xBytes[0])
destAddr := uintptr(unsafe.Pointer(output)) + uintptr(outputOffset+64-xLen)
destPtr := unsafe.Pointer(destAddr)

// Copy from source to destination
C.memcpy(destPtr, srcPtr, C.size_t(xLen))
}

var y big.Int
Expand All @@ -843,7 +850,14 @@ func nonMontgomeryMarshal(xVal, yVal *fp.Element, output *C.char, outputOffset i

if yLen > 0 {
// Copy y to output at offset (128 - yLen)
C.memcpy(unsafe.Pointer(uintptr(unsafe.Pointer(output))+uintptr(outputOffset+128-yLen)), unsafe.Pointer(&yBytes[0]), C.size_t(yLen))

// Calculate source and destination addresses
srcPtr := unsafe.Pointer(&yBytes[0])
destAddr := uintptr(unsafe.Pointer(output)) + uintptr(outputOffset+128-yLen)
destPtr := unsafe.Pointer(destAddr)

// Copy from source to destination
C.memcpy(destPtr, srcPtr, C.size_t(yLen))
}
}

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