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conversion to/from bytes and data buffer modules

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This commit is contained in:
Onran
2024-02-27 10:44:22 +09:00
committed by GitHub
parent 480e72b690
commit a75d578aea
2 changed files with 132 additions and 46 deletions
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res/modules/bit_converter.lua
+40 -42
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@@ -4,8 +4,6 @@ local MAX_UINT16 = 65535
local MIN_UINT16 = 0
local MAX_UINT32 = 4294967295
local MIN_UINT32 = 0
local MAX_UINT64 = 18446744073709551615
local MIN_UINT64 = 0
local MAX_INT16 = 32767
local MIN_INT16 = -32768
@@ -30,7 +28,7 @@ function bit_converter.string_to_bytes(str)
local len = string.len(str)
local lenBytes = bit_converter.int32_to_bytes(len)
local lenBytes = bit_converter.uint16_to_bytes(len)
for i = 1, #lenBytes do
bytes[i] = lenBytes[i]
@@ -127,23 +125,6 @@ function bit_converter.double_to_bytes(double)
return floatOrDoubleToBytes(double, 'd')
end
function bit_converter.int64_to_bytes(int)
if int > MAX_INT64 or int < MIN_INT64 then
error("invalid int64")
end
return {
intToByte(bit.rshift(int, 56)),
intToByte(bit.rshift(int, 48)),
intToByte(bit.rshift(int, 40)),
intToByte(bit.rshift(int, 32)),
intToByte(bit.rshift(int, 24)),
intToByte(bit.rshift(int, 16)),
intToByte(bit.rshift(int, 8)),
intToByte(int)
}
end
function bit_converter.uint32_to_bytes(int)
if int > MAX_UINT32 or int < MIN_UINT32 then
error("invalid uint32")
@@ -168,6 +149,23 @@ function bit_converter.uint16_to_bytes(int)
}
end
function bit_converter.int64_to_bytes(int)
if int > MAX_INT64 or int < MIN_INT64 then
error("invalid int64")
end
return {
intToByte(bit.rshift(int, 56)),
intToByte(bit.rshift(int, 48)),
intToByte(bit.rshift(int, 40)),
intToByte(bit.rshift(int, 32)),
intToByte(bit.rshift(int, 24)),
intToByte(bit.rshift(int, 16)),
intToByte(bit.rshift(int, 8)),
intToByte(int)
}
end
function bit_converter.int32_to_bytes(int)
if int > MAX_INT32 or int < MIN_INT32 then
error("invalid int32")
@@ -193,7 +191,7 @@ function bit_converter.bytes_to_double(bytes)
end
function bit_converter.bytes_to_string(bytes)
local len = bit_converter.bytes_to_int32({ bytes[1], bytes[2], bytes[3], bytes[4]})
local len = bit_converter.bytes_to_uint16({ bytes[1], bytes[2] })
local str = ""
@@ -215,27 +213,6 @@ function bit_converter.bytes_to_float(bytes)
error("unsupported operation")
end
function bit_converter.bytes_to_int64(bytes)
if #bytes < 8 then
error("eof")
end
return
bit.bor(
bit.bor(
bit.bor(
bit.bor(
bit.bor(
bit.bor(
bit.bor(
bit.lshift(bytes[1], 56),
bit.lshift(bytes[2], 48)),
bit.lshift(bytes[3], 40)),
bit.lshift(bytes[4], 32)),
bit.lshift(bytes[5], 24)),
bit.lshift(bit.band(bytes[6], 0xFF), 16)),
bit.lshift(bit.band(bytes[7], 0xFF), 8)),bit.band(bytes[8], 0xFF))
end
function bit_converter.bytes_to_uint32(bytes)
if #bytes < 4 then
error("eof")
@@ -259,6 +236,27 @@ function bit_converter.bytes_to_uint16(bytes)
bytes[2], 0)
end
function bit_converter.bytes_to_int64(bytes)
if #bytes < 8 then
error("eof")
end
return
bit.bor(
bit.bor(
bit.bor(
bit.bor(
bit.bor(
bit.bor(
bit.bor(
bit.lshift(bytes[1], 56),
bit.lshift(bytes[2], 48)),
bit.lshift(bytes[3], 40)),
bit.lshift(bytes[4], 32)),
bit.lshift(bytes[5], 24)),
bit.lshift(bit.band(bytes[6], 0xFF), 16)),
bit.lshift(bit.band(bytes[7], 0xFF), 8)),bit.band(bytes[8], 0xFF))
end
function bit_converter.bytes_to_int32(bytes)
return bit_converter.bytes_to_uint32(bytes) - MAX_INT32
end