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implemented substitution behavior by using non-posix iconvctl. also implemented bad input bytes tolerance (via ignore)

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5822 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
shatty 2003-12-30 10:36:07 +00:00
parent cac6c93c3a
commit 5707f9a19b
1 changed files with 53 additions and 17 deletions
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70
src/kits/textencoding/utf8_conversions.cpp
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@ -4,17 +4,21 @@
#include <CharacterSetRoster.h>
#include <Errors.h>
#include <errno.h>
#include <stdio.h>
using namespace BPrivate;
typedef char ** input_buffer_t;
int iconvctl (iconv_t icd, int request, void* argument);
status_t
convert_encoding(const char * from, const char * to,
const char * src, int32 * srcLen,
char * dst, int32 * dstLen,
int32 * state)
int32 * state, char substitute)
{
status_t status;
if (*srcLen == 0) {
// nothing to do!
return B_OK;
@ -32,23 +36,55 @@ convert_encoding(const char * from, const char * to,
input_buffer_t inputBuffer = const_cast<input_buffer_t>(&src);
size_t inputLeft = *srcLen;
size_t outputLeft = *dstLen;
size_t nonReversibleConversions = iconv(conversion,inputBuffer,&inputLeft,&dst,&outputLeft);
do {
size_t nonReversibleConversions = iconv(conversion,inputBuffer,&inputLeft,&dst,&outputLeft);
if (nonReversibleConversions == (size_t)-1) {
switch (errno) {
case EILSEQ: // unable to generate a corresponding character
{
// discard the input character
const int one = 1, zero = 0;
iconvctl(conversion,ICONV_SET_DISCARD_ILSEQ,(void*)&one);
iconv(conversion,inputBuffer,&inputLeft,&dst,&outputLeft);
iconvctl(conversion,ICONV_SET_DISCARD_ILSEQ,(void*)&zero);
// prepare to convert the substitute character to target encoding
char * original = new char[1];
original[0] = substitute;
size_t len = 1;
char * copy = original;
// Perform the conversion
// We ignore any errors during this as part of robustness/best-effort
// We use ISO-8859-1 as a source because it is a single byte encoding
// It also overlaps UTF-8 for the lower 128 characters. It is also
// likely to have a mapping to almost any target encoding.
iconv_t iso8859_1to = iconv_open(to,"ISO-8859-1");
if (iso8859_1to != (iconv_t)-1) {
iconv(iso8859_1to,0,0,0,0);
iconv(iso8859_1to,const_cast<input_buffer_t>(&copy),&len,&dst,&outputLeft);
iconv_close(iso8859_1to);
}
delete original;
}
break;
case EINVAL: // incomplete multibyte sequence in the input
// we just eat bad bytes, as part of robustness/best-effort
inputBuffer++;
inputLeft--;
break;
case E2BIG:
// not enough room in the output buffer for the next converted character
break;
default:
// unknown error, completely bail
status = errno;
iconv_close(conversion);
return status;
}
}
} while ((inputLeft > 0) && (outputLeft > 0));
*srcLen -= inputLeft;
*dstLen -= outputLeft;
iconv_close(conversion);
if (nonReversibleConversions == -1) {
switch (errno) {
case EILSEQ: // invalid multibyte sequence in the source
return B_ERROR;
case EINVAL: // incomplete multibyte sequence in the input
return B_OK;
case E2BIG: // not enough room in the output buffer for the next converted character
return B_OK;
default:
// unknown error
int err = errno;
}
}
if (*srcLen != 0) {
// able to convert at least one character
return B_OK;
@ -68,7 +104,7 @@ convert_to_utf8(uint32 srcEncoding,
if (charset == 0) {
return B_ERROR;
}
return convert_encoding(charset->GetName(),"UTF-8",src,srcLen,dst,dstLen,state);
return convert_encoding(charset->GetName(),"UTF-8",src,srcLen,dst,dstLen,state,substitute);
}
status_t
@ -81,5 +117,5 @@ convert_from_utf8(uint32 dstEncoding,
if (charset == 0) {
return B_ERROR;
}
return convert_encoding("UTF-8",charset->GetName(),src,srcLen,dst,dstLen,state);
return convert_encoding("UTF-8",charset->GetName(),src,srcLen,dst,dstLen,state,substitute);
}