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Jack Kelley

2017-Apr-29 23:53 UTC

[Rd] Any progress on write.csv fileEncoding for UTF-16 and UTF-32 ?

"R version 3.4.0 (2017-04-21)"  on "x86_64-w64-mingw32"
platform

I am using CSVs and other text tables, and text in general (including
regular expressions), on Windows 10.
For me, that means dealing with Windows-1252 and UTF-8 encoding, with UTF-16
and UTF-32 as helpful curiosities.

Something as simple as iconv ("\n", to = "UTF-16") causes an
error, due to
an embedded nul.

Then there is write.csv (or write.table) with its fileEncoding parameter:
not working correctly for UTF-16 and UTF-32.

Of course, developers are aware of this, for example 


[Rd] iconv to UTF-16 encoding produces error due to embedded nulls
(write.table with fileEncoding param)
https://stat.ethz.ch/pipermail/r-devel/2016-February/072323.html

iconv to UTF-16 encoding produces error due to embedded nulls (write.table
with fileEncoding param)
http://r.789695.n4.nabble.com/iconv-to-UTF-16-encoding-produces-error-due-to
-embedded-nulls-write-table-with-fileEncoding-param-td4717481.html

----------------------------------------------------------------------------
------------------------

Focussing on write.csv and UTF-16LE and UTF-16BE, it seems that a nul
character is omitted in each <CarriageReturn><LineFeed> pair.

TEST SCRIPT
----------------------------------------------------------------------------
------------------------
remove (list = objects())

print (sessionInfo())
cat ("---------------------------------\n\n")

LE <- data.frame (
  want = c ("0d,00", "0a,00"),
  got  = c ("0d   ", "0a,00")
)

BE <- data.frame (
  want = c ("00,0d", "00,0a"),
  got  = c ("00,0d", "   0a")
)

write.csv (LE, "R_LE.csv", fileEncoding = "UTF-16LE",
row.names = FALSE)
write.csv (BE, "R_BE.csv", fileEncoding = "UTF-16BE",
row.names = FALSE)

print (readBin ("R_LE.csv", "raw", 1000))
print (LE)
cat ("\n")

print (readBin ("R_BE.csv", "raw", 1000))
print (BE)
cat ("\n")

try (iconv ("\n", to = "UTF-8"))

try (iconv ("\n", to = "UTF-16LE"))
try (iconv ("\n", to = "UTF-16BE"))
try (iconv ("\n", to = "UTF-16"))

try (iconv ("\n", to = "UTF-32LE"))
try (iconv ("\n", to = "UTF-32BE"))
try (iconv ("\n", to = "UTF-32"))
----------------------------------------------------------------------------
------------------------

TEST SCRIPT OUTPUT
> source ("bug_encoding.R")R version 3.4.0 (2017-04-21)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 14393)

Matrix products: default

locale:
[1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252
[3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C
[5] LC_TIME=English_Australia.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] compiler_3.4.0
---------------------------------

 [1] 22 00 77 00 61 00 6e 00 74 00 22 00 2c 00 22 00 67 00 6f 00 74 00 22 00
0d
[26] 0a 00 22 00 30 00 64 00 2c 00 30 00 30 00 22 00 2c 00 22 00 30 00 64 00
20
[51] 00 20 00 20 00 22 00 0d 0a 00 22 00 30 00 61 00 2c 00 30 00 30 00 22 00
2c
[76] 00 22 00 30 00 61 00 2c 00 30 00 30 00 22 00 0d 0a 00
   want   got
1 0d,00 0d
2 0a,00 0a,00

 [1] 00 22 00 77 00 61 00 6e 00 74 00 22 00 2c 00 22 00 67 00 6f 00 74 00 22
00
[26] 0d 0a 00 22 00 30 00 30 00 2c 00 30 00 64 00 22 00 2c 00 22 00 30 00 30
00
[51] 2c 00 30 00 64 00 22 00 0d 0a 00 22 00 30 00 30 00 2c 00 30 00 61 00 22
00
[76] 2c 00 22 00 20 00 20 00 20 00 30 00 61 00 22 00 0d 0a
   want   got
1 00,0d 00,0d
2 00,0a    0a

Error in iconv("\n", to = "UTF-16LE") : embedded nul in
string: '\n\0'
Error in iconv("\n", to = "UTF-16BE") : embedded nul in
string: '\0\n'
Error in iconv("\n", to = "UTF-16") : embedded nul in
string: '??\0\n'
Error in iconv("\n", to = "UTF-32LE") :
  embedded nul in string: '\n\0\0\0'
Error in iconv("\n", to = "UTF-32BE") :
  embedded nul in string: '\0\0\0\n'
Error in iconv("\n", to = "UTF-32") :
  embedded nul in string: '\0\0??\0\0\0\n'>----------------------------------------------------------------------------
------------------------
Cheers -- Jack Kelley

Duncan Murdoch

2017-Apr-30 16:23 UTC

head link

[Rd] Any progress on write.csv fileEncoding for UTF-16 and UTF-32 ?

No, I don't think anyone is working on this.

There's a fairly simple workaround for the UTF-16 and UTF-32 iconv 
issues:  don't attempt to produce character vectors, produce raw vectors 
instead. (The "toRaw" argument to iconv() asks for this.) Raw vectors 
can contain embedded nulls.  Character vectors can't, because 
internally, R is using 8 bit C strings, and the nulls are string 
terminators.

I don't know how difficult it would be to fix the write.table problems.

Duncan Murdoch

On 29/04/2017 7:53 PM, Jack Kelley wrote:> "R version 3.4.0 (2017-04-21)"  on "x86_64-w64-mingw32"
platform
>
> I am using CSVs and other text tables, and text in general (including
> regular expressions), on Windows 10.
> For me, that means dealing with Windows-1252 and UTF-8 encoding, with
UTF-16
> and UTF-32 as helpful curiosities.
>
> Something as simple as iconv ("\n", to = "UTF-16")
causes an error, due to
> an embedded nul.
>
> Then there is write.csv (or write.table) with its fileEncoding parameter:
> not working correctly for UTF-16 and UTF-32.
>
> Of course, developers are aware of this, for example ?
>
> [Rd] iconv to UTF-16 encoding produces error due to embedded nulls
> (write.table with fileEncoding param)
> https://stat.ethz.ch/pipermail/r-devel/2016-February/072323.html
>
> iconv to UTF-16 encoding produces error due to embedded nulls (write.table
> with fileEncoding param)
>
http://r.789695.n4.nabble.com/iconv-to-UTF-16-encoding-produces-error-due-to
> -embedded-nulls-write-table-with-fileEncoding-param-td4717481.html
>
>
----------------------------------------------------------------------------
> ------------------------
>
> Focussing on write.csv and UTF-16LE and UTF-16BE, it seems that a nul
> character is omitted in each <CarriageReturn><LineFeed> pair.
>
> TEST SCRIPT
>
----------------------------------------------------------------------------
> ------------------------
> remove (list = objects())
>
> print (sessionInfo())
> cat ("---------------------------------\n\n")
>
> LE <- data.frame (
>   want = c ("0d,00", "0a,00"),
>   got  = c ("0d   ", "0a,00")
> )
>
> BE <- data.frame (
>   want = c ("00,0d", "00,0a"),
>   got  = c ("00,0d", "   0a")
> )
>
> write.csv (LE, "R_LE.csv", fileEncoding = "UTF-16LE",
row.names = FALSE)
> write.csv (BE, "R_BE.csv", fileEncoding = "UTF-16BE",
row.names = FALSE)
>
> print (readBin ("R_LE.csv", "raw", 1000))
> print (LE)
> cat ("\n")
>
> print (readBin ("R_BE.csv", "raw", 1000))
> print (BE)
> cat ("\n")
>
> try (iconv ("\n", to = "UTF-8"))
>
> try (iconv ("\n", to = "UTF-16LE"))
> try (iconv ("\n", to = "UTF-16BE"))
> try (iconv ("\n", to = "UTF-16"))
>
> try (iconv ("\n", to = "UTF-32LE"))
> try (iconv ("\n", to = "UTF-32BE"))
> try (iconv ("\n", to = "UTF-32"))
>
----------------------------------------------------------------------------
> ------------------------
>
> TEST SCRIPT OUTPUT
>
>> source ("bug_encoding.R")
> R version 3.4.0 (2017-04-21)
> Platform: x86_64-w64-mingw32/x64 (64-bit)
> Running under: Windows 10 x64 (build 14393)
>
> Matrix products: default
>
> locale:
> [1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252
> [3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C
> [5] LC_TIME=English_Australia.1252
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> loaded via a namespace (and not attached):
> [1] compiler_3.4.0
> ---------------------------------
>
>  [1] 22 00 77 00 61 00 6e 00 74 00 22 00 2c 00 22 00 67 00 6f 00 74 00 22
00
> 0d
> [26] 0a 00 22 00 30 00 64 00 2c 00 30 00 30 00 22 00 2c 00 22 00 30 00 64
00
> 20
> [51] 00 20 00 20 00 22 00 0d 0a 00 22 00 30 00 61 00 2c 00 30 00 30 00 22
00
> 2c
> [76] 00 22 00 30 00 61 00 2c 00 30 00 30 00 22 00 0d 0a 00
>    want   got
> 1 0d,00 0d
> 2 0a,00 0a,00
>
>  [1] 00 22 00 77 00 61 00 6e 00 74 00 22 00 2c 00 22 00 67 00 6f 00 74 00
22
> 00
> [26] 0d 0a 00 22 00 30 00 30 00 2c 00 30 00 64 00 22 00 2c 00 22 00 30 00
30
> 00
> [51] 2c 00 30 00 64 00 22 00 0d 0a 00 22 00 30 00 30 00 2c 00 30 00 61 00
22
> 00
> [76] 2c 00 22 00 20 00 20 00 20 00 30 00 61 00 22 00 0d 0a
>    want   got
> 1 00,0d 00,0d
> 2 00,0a    0a
>
> Error in iconv("\n", to = "UTF-16LE") : embedded nul in
string: '\n\0'
> Error in iconv("\n", to = "UTF-16BE") : embedded nul in
string: '\0\n'
> Error in iconv("\n", to = "UTF-16") : embedded nul in
string: '??\0\n'
> Error in iconv("\n", to = "UTF-32LE") :
>   embedded nul in string: '\n\0\0\0'
> Error in iconv("\n", to = "UTF-32BE") :
>   embedded nul in string: '\0\0\0\n'
> Error in iconv("\n", to = "UTF-32") :
>   embedded nul in string: '\0\0??\0\0\0\n'
>>
>
----------------------------------------------------------------------------
> ------------------------
> Cheers -- Jack Kelley
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

Duncan Murdoch

2017-May-01 18:21 UTC

head link

[Rd] Any progress on write.csv fileEncoding for UTF-16 and UTF-32 ?

On 30/04/2017 12:23 PM, Duncan Murdoch wrote:> No, I don't think anyone is working on this.
>
> There's a fairly simple workaround for the UTF-16 and UTF-32 iconv
> issues:  don't attempt to produce character vectors, produce raw
vectors
> instead. (The "toRaw" argument to iconv() asks for this.) Raw
vectors
> can contain embedded nulls.  Character vectors can't, because
> internally, R is using 8 bit C strings, and the nulls are string
> terminators.
>
> I don't know how difficult it would be to fix the write.table problems.
I've now taken a look, and it appears as if it's not too hard.  I'll
see
if I can work out a patch that I trust.

Duncan Murdoch
>
> Duncan Murdoch
>
> On 29/04/2017 7:53 PM, Jack Kelley wrote:
>> "R version 3.4.0 (2017-04-21)"  on
"x86_64-w64-mingw32" platform
>>
>> I am using CSVs and other text tables, and text in general (including
>> regular expressions), on Windows 10.
>> For me, that means dealing with Windows-1252 and UTF-8 encoding, with
UTF-16
>> and UTF-32 as helpful curiosities.
>>
>> Something as simple as iconv ("\n", to = "UTF-16")
causes an error, due to
>> an embedded nul.
>>
>> Then there is write.csv (or write.table) with its fileEncoding
parameter:
>> not working correctly for UTF-16 and UTF-32.
>>
>> Of course, developers are aware of this, for example ?
>>
>> [Rd] iconv to UTF-16 encoding produces error due to embedded nulls
>> (write.table with fileEncoding param)
>> https://stat.ethz.ch/pipermail/r-devel/2016-February/072323.html
>>
>> iconv to UTF-16 encoding produces error due to embedded nulls
(write.table
>> with fileEncoding param)
>>
http://r.789695.n4.nabble.com/iconv-to-UTF-16-encoding-produces-error-due-to
>> -embedded-nulls-write-table-with-fileEncoding-param-td4717481.html
>>
>>
----------------------------------------------------------------------------
>> ------------------------
>>
>> Focussing on write.csv and UTF-16LE and UTF-16BE, it seems that a nul
>> character is omitted in each <CarriageReturn><LineFeed>
pair.
>>
>> TEST SCRIPT
>>
----------------------------------------------------------------------------
>> ------------------------
>> remove (list = objects())
>>
>> print (sessionInfo())
>> cat ("---------------------------------\n\n")
>>
>> LE <- data.frame (
>>   want = c ("0d,00", "0a,00"),
>>   got  = c ("0d   ", "0a,00")
>> )
>>
>> BE <- data.frame (
>>   want = c ("00,0d", "00,0a"),
>>   got  = c ("00,0d", "   0a")
>> )
>>
>> write.csv (LE, "R_LE.csv", fileEncoding =
"UTF-16LE", row.names = FALSE)
>> write.csv (BE, "R_BE.csv", fileEncoding =
"UTF-16BE", row.names = FALSE)
>>
>> print (readBin ("R_LE.csv", "raw", 1000))
>> print (LE)
>> cat ("\n")
>>
>> print (readBin ("R_BE.csv", "raw", 1000))
>> print (BE)
>> cat ("\n")
>>
>> try (iconv ("\n", to = "UTF-8"))
>>
>> try (iconv ("\n", to = "UTF-16LE"))
>> try (iconv ("\n", to = "UTF-16BE"))
>> try (iconv ("\n", to = "UTF-16"))
>>
>> try (iconv ("\n", to = "UTF-32LE"))
>> try (iconv ("\n", to = "UTF-32BE"))
>> try (iconv ("\n", to = "UTF-32"))
>>
----------------------------------------------------------------------------
>> ------------------------
>>
>> TEST SCRIPT OUTPUT
>>
>>> source ("bug_encoding.R")
>> R version 3.4.0 (2017-04-21)
>> Platform: x86_64-w64-mingw32/x64 (64-bit)
>> Running under: Windows 10 x64 (build 14393)
>>
>> Matrix products: default
>>
>> locale:
>> [1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252
>> [3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C
>> [5] LC_TIME=English_Australia.1252
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>
>> loaded via a namespace (and not attached):
>> [1] compiler_3.4.0
>> ---------------------------------
>>
>>  [1] 22 00 77 00 61 00 6e 00 74 00 22 00 2c 00 22 00 67 00 6f 00 74 00
22 00
>> 0d
>> [26] 0a 00 22 00 30 00 64 00 2c 00 30 00 30 00 22 00 2c 00 22 00 30 00
64 00
>> 20
>> [51] 00 20 00 20 00 22 00 0d 0a 00 22 00 30 00 61 00 2c 00 30 00 30 00
22 00
>> 2c
>> [76] 00 22 00 30 00 61 00 2c 00 30 00 30 00 22 00 0d 0a 00
>>    want   got
>> 1 0d,00 0d
>> 2 0a,00 0a,00
>>
>>  [1] 00 22 00 77 00 61 00 6e 00 74 00 22 00 2c 00 22 00 67 00 6f 00 74
00 22
>> 00
>> [26] 0d 0a 00 22 00 30 00 30 00 2c 00 30 00 64 00 22 00 2c 00 22 00 30
00 30
>> 00
>> [51] 2c 00 30 00 64 00 22 00 0d 0a 00 22 00 30 00 30 00 2c 00 30 00 61
00 22
>> 00
>> [76] 2c 00 22 00 20 00 20 00 20 00 30 00 61 00 22 00 0d 0a
>>    want   got
>> 1 00,0d 00,0d
>> 2 00,0a    0a
>>
>> Error in iconv("\n", to = "UTF-16LE") : embedded
nul in string: '\n\0'
>> Error in iconv("\n", to = "UTF-16BE") : embedded
nul in string: '\0\n'
>> Error in iconv("\n", to = "UTF-16") : embedded nul
in string: '??\0\n'
>> Error in iconv("\n", to = "UTF-32LE") :
>>   embedded nul in string: '\n\0\0\0'
>> Error in iconv("\n", to = "UTF-32BE") :
>>   embedded nul in string: '\0\0\0\n'
>> Error in iconv("\n", to = "UTF-32") :
>>   embedded nul in string: '\0\0??\0\0\0\n'
>>>
>>
----------------------------------------------------------------------------
>> ------------------------
>> Cheers -- Jack Kelley
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>

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