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trs-inspector-mmap.jl
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trs-inspector-mmap.jl
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# This file is part of Jlsca, license is GPLv3, see https://www.gnu.org/licenses/gpl-3.0.en.html
#
# Author: Cees-Bart Breunesse
export InspectorTraceMM,readData,readSamples,writeToTraces
using Base.get
import Base.close
# Inspector trace set implementation
type InspectorTraceMM <: Trace
mmData::Array
mmSamples::Array
titleSpace
numberOfTraces::Nullable{Int}
dataSpace
sampleSpace
sampleType
numberOfSamplesPerTrace
traceBlockPosition
fileDescriptor
passes
dataPasses
postProcType
postProcArguments
postProcInstance
bgtask
tracesReturned
filename
writeable::Bool
lengthPosition::Int
# to open an existing file
function InspectorTraceMM(filename::String)
(mmData, mmSamples, titleSpace, numberOfTraces, dataSpace, sampleSpace, sampleType, numberOfSamplesPerTrace, traceBlockPosition, lengthPosition, fileDescriptor) = readInspectorTrsHeaderMM(filename)
new(mmData, mmSamples, titleSpace, numberOfTraces, dataSpace, sampleSpace, sampleType, numberOfSamplesPerTrace, traceBlockPosition, fileDescriptor, [], [], Union, nothing, Union, Union, 0, filename, false, lengthPosition)
end
# # to create a new one
# function InspectorTraceMM(filename::String, dataSpace::Int, sampleType::Type, numberOfSamplesPerTrace::Int)
# !isfile(filename) || throw(ErrorException(@sprintf("file %s exists!", filename)))
#
# (mm, titleSpace, traceBlockPosition, lengthPosition, fileDescriptor) = writeInspectorTrsHeader(filename, dataSpace, sampleType, numberOfSamplesPerTrace)
# new(mm, titleSpace, Nullable(0), dataSpace, sizeof(sampleType), sampleType, numberOfSamplesPerTrace, traceBlockPosition, fileDescriptor, [], [], Union, nothing, Union, Union, 0, filename, traceBlockPosition, true, lengthPosition)
# end
end
const NumberOfTraces = 0x41
const NumberOfTracesLength = 4
const NumberOfSamplesPerTrace = 0x42
const NumberOfSamplesPerTraceLength = 4
const SampleCoding = 0x43
const SampleCodingLength = 1
const DataSpace = 0x44
const DataSpaceLength = 2
const TitleSpace = 0x45
const TitleSpaceLength = 1
const Description = 0x47
const TraceBlock = 0x5F
const CodingByte = 0x01
const CodingShort = 0x02
const CodingInt = 0x04
const CodingFloat = 0x14
# debugging
const verbose = true
pipe(trs::InspectorTraceMM) = isa(trs.fileDescriptor, Base.PipeEndpoint)
length(trs::InspectorTraceMM) = isnull(trs.numberOfTraces) ? typemax(Int) : get(trs.numberOfTraces)
# read the header of a Riscure Inspector trace set (TRS)
function readInspectorTrsHeaderMM(filename)
if filename != "-"
f = open(filename, "r")
else
f = STDIN
end
seekable = !isa(f, Base.PipeEndpoint)
try
done = false
titleSpace = 0
numberOfTraces = Nullable()
dataSpace = 0
sampleSpace = 0
sampleType = UInt8
numberOfSamplesPerTrace = 0
traceBlockPosition = 0
lengthPosition = 0
if verbose
if seekable
@printf("Opening Inspector trs file %s ..\n", filename)
else
@printf("Opening Inspector trs from stdin ..\n")
end
end
while !done
tag = read(f, UInt8)
length = read(f, UInt8)
if length & 0x80 == 0x80
lolwut = length & 0x7f
length = 0
for i in 1:lolwut
length += (UInt(read(f, UInt8)) << (8*(i-1)))
end
end
if tag == TraceBlock && length == 0
if seekable
traceBlockPosition = position(f)
end
done = true
elseif tag == TitleSpace && length == TitleSpaceLength
titleSpace = read(f, UInt8)
elseif tag == NumberOfTraces && length == NumberOfTracesLength
lengthPosition = position(f)
numberOfTraces = Nullable(ltoh(read(f, UInt32)))
elseif tag == DataSpace && length == DataSpaceLength
dataSpace = ltoh(read(f, UInt16))
elseif tag == NumberOfSamplesPerTrace && length == NumberOfSamplesPerTraceLength
numberOfSamplesPerTrace = ltoh(read(f, UInt32))
elseif tag == SampleCoding && length == SampleCodingLength
sampleCoding = read(f, UInt8)
if sampleCoding == CodingFloat
sampleType = Float32
sampleSpace = 4
elseif sampleCoding == CodingInt
sampleType = UInt32
sampleSpace = 4
elseif sampleCoding == CodingShort
sampleType = Int16
sampleSpace = 2
elseif sampleCoding == CodingByte
sampleType = UInt8
sampleSpace = 1
end
else
if verbose
println("[x] Skipping unknown tag $tag with length $length")
end
read(f, length)
end
end
if verbose
if !isnull(numberOfTraces)
@printf("#traces: %d\n", get(numberOfTraces))
end
@printf("#samples: %d\n", numberOfSamplesPerTrace)
@printf("#data: %d\n", dataSpace)
@printf("type: %s\n", string(sampleType))
end
if ((dataSpace+titleSpace) % sizeof(sampleType)) != 0
throw(ErrorException(@sprintf("dataSpace+titleSpace of trace set must be multiples of %d bytes", sizeof(sampleType))))
end
return (Mmap.mmap(f,Vector{UInt8}), Mmap.mmap(f,Vector{sampleType}), titleSpace, numberOfTraces, dataSpace, sampleSpace, sampleType, numberOfSamplesPerTrace, traceBlockPosition, lengthPosition, f)
catch e
close(f)
rethrow(e)
end
end
function close(trs::InspectorTraceMM)
if trs.writeable
seek(trs.fileDescriptor, trs.lengthPosition)
write(trs.fileDescriptor, htol(convert(UInt32, length(trs))))
if verbose
@printf("Wrote %d traces in %s\n", length(trs), trs.filename)
end
end
finalize(trs.mmData)
finalize(trs.mmSamples)
close(trs.fileDescriptor)
end
calcPositionForData(trs::InspectorTraceMM, idx::Int) = (idx-1) * (trs.titleSpace + trs.dataSpace + trs.numberOfSamplesPerTrace * trs.sampleSpace)
# read data for a single trace from an Inspector trace set
function readData(trs::InspectorTraceMM, idx)
position = calcPositionForData(trs, idx)
start = (position + trs.titleSpace)
data = view(trs.mmData, (start+1):(start+trs.dataSpace))
return data
end
calcPositionForSamples(trs::InspectorTraceMM, idx::Int) = (idx-1) * (div(trs.titleSpace + trs.dataSpace, trs.sampleSpace) + trs.numberOfSamplesPerTrace)
# read samples for a single tracec from an Inspector trace set
function readSamples(trs::InspectorTraceMM, idx)
position = calcPositionForSamples(trs, idx)
start = position + div(trs.dataSpace + trs.titleSpace, trs.sampleSpace)
samples = view(trs.mmSamples, (start+1):(start + trs.numberOfSamplesPerTrace))
return samples
end