Compile error C2036: 'void *': unknown size

[timi-liuliang]

file [icns_png.c] line [57]

  /* copy new bytes to end of buffer */
  memcpy(_ref->data + _ref->offset, data, length);

the type of _ref->data is void*

And there are a lot of warnings when compiling with visual studio 2019

2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(82,42): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(104,54): warning C4018: '>': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(214,42): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(254,21): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(359,42): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(396,21): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(585,39): warning C4244: '=': conversion from 'icns_uint64_t' to 'icns_size_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(588,61): warning C4244: 'function': conversion from 'icns_uint64_t' to 'icns_size_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(614,46): warning C4244: '=': conversion from 'icns_uint64_t' to 'icns_size_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_element.c(671,41): warning C4244: '=': conversion from 'icns_uint64_t' to 'icns_size_t', possible loss of data
2>icns_family.c
2>D:\Github\echo-dev\thirdparty\libicns\icns_family.c(93,20): warning C4018: '<': signed/unsigned mismatch
2>icns_image.c
2>D:\Github\echo-dev\thirdparty\libicns\icns_image.c(470,1): warning C4244: 'initializing': conversion from 'icns_uint64_t' to 'icns_size_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_image.c(624,42): warning C4244: '=': conversion from 'icns_uint64_t' to 'unsigned long', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_image.c(652,42): warning C4244: '=': conversion from 'icns_uint64_t' to 'unsigned long', possible loss of data
2>icns_io.c
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(161,11): warning C4244: '=': conversion from 'uint16_t' to 'icns_byte_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(177,17): warning C4244: '=': conversion from 'uint64_t' to 'icns_byte_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(178,17): warning C4244: '=': conversion from 'uint64_t' to 'icns_byte_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(179,17): warning C4244: '=': conversion from 'uint64_t' to 'icns_byte_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(180,17): warning C4244: '=': conversion from 'uint64_t' to 'icns_byte_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(181,17): warning C4244: '=': conversion from 'uint64_t' to 'icns_byte_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(182,16): warning C4244: '=': conversion from 'uint64_t' to 'icns_byte_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(183,11): warning C4244: '=': conversion from 'uint64_t' to 'icns_byte_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(238,72): warning C4267: '=': conversion from 'size_t' to 'icns_size_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(248,77): warning C4267: '=': conversion from 'size_t' to 'icns_size_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(623,26): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(636,53): warning C4018: '>': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(787,26): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(800,53): warning C4018: '>': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(911,54): warning C4018: '>': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_io.c(922,23): warning C4018: '<': signed/unsigned mismatch
2>icns_jp2.c
2>D:\Github\echo-dev\thirdparty\libicns\icns_jp2.c(944,45): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_jp2.c(954,28): warning C4018: '>=': signed/unsigned mismatch
2>icns_png.c
2>D:\Github\echo-dev\thirdparty\libicns\icns_png.c(145,47): warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_png.c(162,20): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_png.c(299,31): warning C4267: '=': conversion from 'size_t' to 'icns_size_t', possible loss of data
2>D:\Github\echo-dev\thirdparty\libicns\icns_png.c(217,14): warning C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
2>icns_rle24.c
2>D:\Github\echo-dev\thirdparty\libicns\icns_rle24.c(117,22): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_rle24.c(117,59): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_rle24.c(123,48): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_rle24.c(123,85): warning C4018: '<': signed/unsigned mismatch
2>D:\Github\echo-dev\thirdparty\libicns\icns_rle24.c(135,48): warning C4018: '<': signed/unsigned mismatch