jyapayne/nim-faststreams
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add a useful debug helper

Browse source
This commit is contained in:
Zahary Karadjov 2018-12-19 12:30:00 +02:00
commit aaff7fac31
1 changed files with 8 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

8
faststreams/input_stream.nim
View file

@ -3,6 +3,7 @@ import
const const
pageSize = 4096 pageSize = 4096
debugHelpers = false
type type
StreamReader = proc (bufferStart: ptr byte, bufferSize: int): int StreamReader = proc (bufferStart: ptr byte, bufferSize: int): int
@ -29,6 +30,8 @@ type
proc openFile*(filename: string): ByteStream = proc openFile*(filename: string): ByteStream =
var memFile = memfiles.open(filename) var memFile = memfiles.open(filename)
result.head = cast[ptr byte](memFile.mem) result.head = cast[ptr byte](memFile.mem)
when debugHelpers:
result.bufferStart = result.head
result.bufferEnd = result.head.shift memFile.size result.bufferEnd = result.head.shift memFile.size
result.bufferEndPos = memFile.size result.bufferEndPos = memFile.size
result.closeStream = proc = close memFile result.closeStream = proc = close memFile
@ -81,6 +84,11 @@ proc peek*(s: ByteStream): byte {.inline.} =
assert s.head != s.bufferEnd assert s.head != s.bufferEnd
return s.head[] return s.head[]
when debugHelpers:
proc showPosition*(s: ByteStream) =
echo "head at ", distance(s.bufferStart, s.head), "/",
distance(s.bufferStart, s.bufferEnd)
proc advance*(s: var ByteStream) = proc advance*(s: var ByteStream) =
if s.head != s.bufferEnd: if s.head != s.bufferEnd:
s.head = s.head.shift 1 s.head = s.head.shift 1