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|
#!/bin/bash
##===----------------------------------------------------------------------===##
##
## This source file is part of the SwiftNIO open source project
##
## Copyright (c) 2021 Apple Inc. and the SwiftNIO project authors
## Licensed under Apache License v2.0
##
## See LICENSE.txt for license information
## See CONTRIBUTORS.txt for the list of SwiftNIO project authors
##
## SPDX-License-Identifier: Apache-2.0
##
##===----------------------------------------------------------------------===##
set -eu
here="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
function gen() {
how_many=$1
# READ
echo " @inlinable"
echo " @_alwaysEmitIntoClient"
echo -n " public mutating func readMultipleIntegers<T1: FixedWidthInteger"
for n in $(seq 2 "$how_many"); do
echo -n ", T$n: FixedWidthInteger"
done
echo -n ">("
echo -n "endianness: Endianness = .big, as: (T1"
for n in $(seq 2 "$how_many"); do
echo -n ", T$n"
done
echo -n ").Type = (T1"
for n in $(seq 2 "$how_many"); do
echo -n ", T$n"
done
echo -n ").self) -> (T1"
for n in $(seq 2 "$how_many"); do
echo -n ", T$n"
done
echo ")? {"
echo " var bytesRequired: Int = MemoryLayout<T1>.size"
for n in $(seq 2 "$how_many"); do
echo " bytesRequired &+= MemoryLayout<T$n>.size"
done
echo
echo " guard self.readableBytes >= bytesRequired else {"
echo " return nil"
echo " }"
echo
for n in $(seq 1 "$how_many"); do
echo " var v$n: T$n = 0"
done
echo " var offset = 0"
echo " self.readWithUnsafeReadableBytes { ptr -> Int in"
echo " assert(ptr.count >= bytesRequired)"
echo " let basePtr = ptr.baseAddress! // safe, ptr is non-empty"
for n in $(seq 1 "$how_many"); do
echo " withUnsafeMutableBytes(of: &v$n) { destPtr in"
echo " destPtr.baseAddress!.copyMemory(from: basePtr + offset, byteCount: MemoryLayout<T$n>.size)"
echo " }"
echo " offset = offset &+ MemoryLayout<T$n>.size"
done
echo " assert(offset == bytesRequired)"
echo " return offset"
echo " }"
echo " switch endianness {"
for endianness in big little; do
echo " case .$endianness:"
echo -n " return (T1(${endianness}Endian: v1)"
for n in $(seq 2 "$how_many"); do
echo -n ", T$n(${endianness}Endian: v$n)"
done
echo ")"
done
echo " }"
echo " }"
echo
# WRITE
echo " @inlinable"
echo " @_alwaysEmitIntoClient"
echo " @discardableResult"
echo -n " public mutating func writeMultipleIntegers<T1: FixedWidthInteger"
for n in $(seq 2 "$how_many"); do
echo -n ", T$n: FixedWidthInteger"
done
echo -n ">(_ value1: T1"
for n in $(seq 2 "$how_many"); do
echo -n ", _ value$n: T$n"
done
echo -n ", endianness: Endianness = .big, as: (T1"
for n in $(seq 2 "$how_many"); do
echo -n ", T$n"
done
echo -n ").Type = (T1"
for n in $(seq 2 "$how_many"); do
echo -n ", T$n"
done
echo ").self) -> Int {"
for n in $(seq 1 "$how_many"); do
echo " var v$n: T$n"
done
echo " switch endianness {"
for endianness in .big .little; do
echo " case $endianness:"
for n in $(seq 1 "$how_many"); do
echo " v$n = value$n${endianness}Endian"
done
done
echo " }"
echo
echo " var spaceNeeded: Int = MemoryLayout<T1>.size"
for n in $(seq 2 "$how_many"); do
echo " spaceNeeded &+= MemoryLayout<T$n>.size"
done
echo
echo " return self.writeWithUnsafeMutableBytes(minimumWritableBytes: spaceNeeded) { ptr -> Int in"
echo " assert(ptr.count >= spaceNeeded)"
echo " var offset = 0"
echo " let basePtr = ptr.baseAddress! // safe: pointer is non zero length"
for n in $(seq 1 "$how_many"); do
echo " (basePtr + offset).copyMemory(from: &v$n, byteCount: MemoryLayout<T$n>.size)"
echo " offset = offset &+ MemoryLayout<T$n>.size"
done
echo " assert(offset == spaceNeeded)"
echo " return offset"
echo " }"
echo " }"
echo
}
grep -q "ByteBuffer" "${BASH_SOURCE[0]}" || {
echo >&2 "ERROR: ${BASH_SOURCE[0]}: file or directory not found (this should be this script)"
exit 1
}
{
cat <<"EOF"
//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2021 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
/// NOTE: THIS FILE IS AUTO-GENERATED BY dev/generate-bytebuffer-multi-int.sh
EOF
echo
echo "extension ByteBuffer {"
# note:
# - widening the inverval below (eg. going from {2..15} to {2..25}) is Semver minor
# - narrowing the interval below is SemVer _MAJOR_!
for n in {2..15}; do
gen "$n"
done
echo "}"
} > "$here/../Sources/NIOCore/ByteBuffer-multi-int.swift"
|
