mirror of https://github.com/Wilfred/difftastic/
74 lines
1.8 KiB
Plaintext
74 lines
1.8 KiB
Plaintext
// Reads a u16 from a buffer in little-endian order.
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export fn legetu16(buf: []u8) u16 = {
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return
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(buf[1] << 8u16) |
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(buf[0] << 0);
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};
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// Writes a u16 into a buffer in little-endian order.
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export fn leputu16(buf: []u8, in: u16) void = {
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buf[0] = (in >> 0): u8;
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buf[1] = (in >> 8): u8;
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};
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// Reads a u32 from a buffer in little-endian order.
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export fn legetu32(buf: []u8) u32 = {
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return
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(buf[3] << 24u32) |
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(buf[2] << 16u32) |
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(buf[1] << 8u32) |
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(buf[0] << 0);
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};
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// Writes a u32 into a buffer in little-endian order.
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export fn leputu32(buf: []u8, in: u32) void = {
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buf[0] = (in): u8;
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buf[1] = (in >> 8): u8;
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buf[2] = (in >> 16): u8;
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buf[3] = (in >> 24): u8;
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};
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// Reads a u64 from a buffer in little-endian order.
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export fn legetu64(buf: []u8) u64 = {
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return
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(buf[7] << 56u64) |
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(buf[6] << 48u64) |
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(buf[5] << 40u64) |
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(buf[4] << 32u64) |
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(buf[3] << 24u64) |
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(buf[2] << 16u64) |
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(buf[1] << 8u64) |
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(buf[0] << 0);
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};
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// Writes a u64 into a buffer in little-endian order.
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export fn leputu64(buf: []u8, in: u64) void = {
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buf[0] = (in >> 0): u8;
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buf[1] = (in >> 8): u8;
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buf[2] = (in >> 16): u8;
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buf[3] = (in >> 24): u8;
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buf[4] = (in >> 32): u8;
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buf[5] = (in >> 40): u8;
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buf[6] = (in >> 48): u8;
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buf[7] = (in >> 56): u8;
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};
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@test fn little() void = {
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let buf: [8]u8 = [0...];
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leputu16(buf, 0x1234);
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assert(buf[0] == 0x34 && buf[1] == 0x12);
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assert(legetu16(buf) == 0x1234);
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leputu32(buf, 0x12345678);
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assert(buf[0] == 0x78 && buf[1] == 0x56
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&& buf[2] == 0x34 && buf[3] == 0x12);
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assert(legetu32(buf) == 0x12345678);
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leputu64(buf, 0x1234567887654321);
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assert(buf[0] == 0x21 && buf[1] == 0x43
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&& buf[2] == 0x65 && buf[3] == 0x87
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&& buf[4] == 0x78 && buf[5] == 0x56
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&& buf[6] == 0x34 && buf[7] == 0x12);
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assert(legetu64(buf) == 0x1234567887654321);
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};
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