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Merge pull request #485 from MihailRis/crc32

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crc32
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MihailRis 2025-03-17 02:42:21 +03:00 • committed by GitHub
commit e1ee1d8a31
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3 changed files with 38 additions and 1 deletions
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32
res/scripts/stdmin.lua
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@ -26,6 +26,38 @@ function __vc_Canvas_set_data(self, data)
self:_set_data(tostring(_ffi.cast("uintptr_t", canvas_ffi_buffer)))
end
_ffi.cdef([[
unsigned long crc32(unsigned long crc, const char *buf, unsigned len);
]])
local zlib
if _ffi.os == "Windows" then
zlib = _ffi.load("zlib1")
elseif _ffi.os == "OSX" then
zlib = _ffi.load("z")
elseif _ffi.os == "Linux" then
zlib = _ffi.load("libz.so.1")
else
error("platform does not support zlib " .. _ffi.os)
end
function crc32(bytes, chksum)
local chksum = chksum or 0
local length = #bytes
if type(bytes) == "string" then
return zlib.crc32(chksum, bytes, length)
elseif type(bytes) == "table" then
local buffer = _ffi.new(
string.format("char[%s]", length)
)
for i=1, length do
buffer[i - 1] = bytes[i]
end
return zlib.crc32(chksum, buffer, length)
end
end
-- Check if given table is an array
function is_array(x)
if #x > 0 then