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Make the std::string overloads of IconvWrapper::Convert significantly faster

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Originally committed to SVN as r4659.
This commit is contained in:
Thomas Goyne 2010-07-07 02:41:40 +00:00
parent 5ed8bf89f6
commit 02237f2a7a
1 changed files with 31 additions and 9 deletions
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40
aegisub/libaegisub/common/charset_conv.cpp
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@ -269,15 +269,37 @@ std::string IconvWrapper::Convert(std::string const& source) {
return dest;
}
void IconvWrapper::Convert(std::string const& source, std::string &dest) {
/// @todo Investigate if it's worth using ropes to avoid having to convert
/// everything twice. It probably isn't.
size_t len = RequiredBufferSize(source);
dest.resize(len);
char buff[512];
const char *src = source.data();
size_t srcLen = source.size();
size_t res;
do {
char *dst = buff;
size_t dstLen = sizeof(buff);
res = (*conv)(cd, &src, &srcLen, &dst, &dstLen);
if (res == 0) (*conv)(cd, NULL, NULL, &dst, &dstLen);
dest.append(buff, sizeof(buff) - dstLen);
} while (res == iconv_failed && errno == E2BIG);
// This is technically invalid as C++03 does not require that strings use
// a single contiguous block of memory. However, no implementation has ever
// not done so and C++0x does require that it be contiguous
Convert(source.data(), source.size(), &dest[0], len);
if (res == iconv_failed) {
switch (errno) {
case EINVAL:
throw BadInput(
"One or more characters in the input string were not valid "
"characters in the given input encoding");
case EILSEQ:
throw BadOutput(
"One or more characters could not be converted to the "
"selected target encoding and the version of iconv "
"Aegisub was built with does not have useful fallbacks. "
"For best results, please build Aegisub using a recent "
"version of GNU iconv.");
default:
throw ConversionFailure("An unknown conversion failure occurred");
}
}
}
size_t IconvWrapper::Convert(const char* source, size_t sourceSize, char *dest, size_t destSize) {
@ -307,7 +329,7 @@ size_t IconvWrapper::Convert(const char* source, size_t sourceSize, char *dest,
"For best results, please build Aegisub using a recent "
"version of GNU iconv.");
default:
throw ConversionFailure("An unknown conversion failure occured");
throw ConversionFailure("An unknown conversion failure occurred");
}
}
return res;