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Add writePointAt helper for geometric encoders #219

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Merged
fox0430 merged 1 commit into from
Apr 21, 2026
Merged

Add writePointAt helper for geometric encoders #219

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29 changes: 13 additions & 16 deletions async_postgres/pg_types/encoding.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -862,11 +862,15 @@ proc toPgParam*(v: seq[JsonNode]): PgParam =
oid: OidJsonbArray, format: 1, value: some(encodeBinaryArray(OidJsonb, elements))
)

template writePointAt*(dst: var openArray[byte], pos: int, p: PgPoint) =
## Write a point as 16 bytes (two float64 big-endian) into dst at pos.
dst.writeBE64(pos, cast[int64](p.x))
dst.writeBE64(pos + 8, cast[int64](p.y))

proc encodePointBinary*(p: PgPoint): seq[byte] =
## Encode a point as 16 bytes (two float64 big-endian).
result = newSeq[byte](16)
result.writeBE64(0, cast[int64](p.x))
result.writeBE64(8, cast[int64](p.y))
result.writePointAt(0, p)

proc toPgBinaryParam*(v: PgPoint): PgParam =
## Binary format: 16 bytes (two float64 big-endian).
Expand All @@ -883,19 +887,15 @@ proc toPgBinaryParam*(v: PgLine): PgParam =
proc toPgBinaryParam*(v: PgLseg): PgParam =
## Binary format: 32 bytes (two points).
var data = newSeq[byte](32)
let p1 = encodePointBinary(v.p1)
copyMem(addr data[0], addr p1[0], 16)
let p2 = encodePointBinary(v.p2)
copyMem(addr data[16], addr p2[0], 16)
data.writePointAt(0, v.p1)
data.writePointAt(16, v.p2)
PgParam(oid: OidLseg, format: 1, value: some(data))

proc toPgBinaryParam*(v: PgBox): PgParam =
## Binary format: 32 bytes (high point, low point).
var data = newSeq[byte](32)
let hi = encodePointBinary(v.high)
copyMem(addr data[0], addr hi[0], 16)
let lo = encodePointBinary(v.low)
copyMem(addr data[16], addr lo[0], 16)
data.writePointAt(0, v.high)
data.writePointAt(16, v.low)
PgParam(oid: OidBox, format: 1, value: some(data))

proc toPgBinaryParam*(v: PgPath): PgParam =
Expand All @@ -904,24 +904,21 @@ proc toPgBinaryParam*(v: PgPath): PgParam =
data[0] = if v.closed: 1'u8 else: 0'u8
data.writeBE32(1, int32(v.points.len))
for i, p in v.points:
let pb = encodePointBinary(p)
copyMem(addr data[5 + i * 16], addr pb[0], 16)
data.writePointAt(5 + i * 16, p)
PgParam(oid: OidPath, format: 1, value: some(data))

proc toPgBinaryParam*(v: PgPolygon): PgParam =
## Binary format: npts(4) + points(npts \* 16).
var data = newSeq[byte](4 + v.points.len * 16)
data.writeBE32(0, int32(v.points.len))
for i, p in v.points:
let pb = encodePointBinary(p)
copyMem(addr data[4 + i * 16], addr pb[0], 16)
data.writePointAt(4 + i * 16, p)
PgParam(oid: OidPolygon, format: 1, value: some(data))

proc toPgBinaryParam*(v: PgCircle): PgParam =
## Binary format: 24 bytes (center point + radius float64).
var data = newSeq[byte](24)
let cp = encodePointBinary(v.center)
copyMem(addr data[0], addr cp[0], 16)
data.writePointAt(0, v.center)
data.writeBE64(16, cast[int64](v.radius))
PgParam(oid: OidCircle, format: 1, value: some(data))

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