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Update endians.nim

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adds swapEndian16 function
This commit is contained in:
Billingsly Wetherfordshire 2013-12-23 11:52:11 -06:00
commit b3057be2c9
1 changed files with 13 additions and 1 deletions
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14
lib/pure/endians.nim
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@ -34,14 +34,26 @@ proc swapEndian32*(outp, inp: pointer) =
o[2] = i[1] o[2] = i[1]
o[3] = i[0] o[3] = i[0]
proc swapEndian16*(outp, inp: pointer) =
## copies `inp` to `outp` swapping bytes. Both buffers are supposed to
## contain at least 2 bytes.
var
i = cast[cstring](inp)
o = cast[cstring](outp)
o[0] = i[1]
o[1] = i[0]
when system.cpuEndian == bigEndian: when system.cpuEndian == bigEndian:
proc littleEndian64*(outp, inp: pointer) {.inline.} = swapEndian64(outp, inp) proc littleEndian64*(outp, inp: pointer) {.inline.} = swapEndian64(outp, inp)
proc littleEndian32*(outp, inp: pointer) {.inline.} = swapEndian32(outp, inp) proc littleEndian32*(outp, inp: pointer) {.inline.} = swapEndian32(outp, inp)
proc littleEndian16*(outp, inp: pointer) {.inline.} = swapEndian16(outp, inp)
proc bigEndian64*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 8) proc bigEndian64*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 8)
proc bigEndian32*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 4) proc bigEndian32*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 4)
proc bigEndian16*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 2)
else: else:
proc littleEndian64*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 8) proc littleEndian64*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 8)
proc littleEndian32*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 4) proc littleEndian32*(outp, inp: pointer) {.inline.} = copyMem(outp, inp, 4)
proc littleEndian16*(outp, inp: pointer){.inline.} = copyMem(outp, inp, 2)
proc bigEndian64*(outp, inp: pointer) {.inline.} = swapEndian64(outp, inp) proc bigEndian64*(outp, inp: pointer) {.inline.} = swapEndian64(outp, inp)
proc bigEndian32*(outp, inp: pointer) {.inline.} = swapEndian32(outp, inp) proc bigEndian32*(outp, inp: pointer) {.inline.} = swapEndian32(outp, inp)
proc bigEndian16*(outp, inp: pointer) {.inline.} = swapEndian16(outp, inp)