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This commit is contained in:
Jonathan Campbell
2019-03-18 20:10:55 -07:00
parent 1c666d1f2e
commit 40a801816c
1 changed files with 30 additions and 25 deletions
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55
experiments/iconv/iconvpp.hpp
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@@ -17,7 +17,36 @@
#include <iconv.h>
template <typename srcT,typename dstT> class _Iconv {
class _Iconv_CommonBase {
public:
static const char *errstring(int x) {
if (x >= 0)
return "no error";
else if (x == err_noinit)
return "not initialized";
else if (x == err_noroom)
return "out of room";
else if (x == err_notvalid)
return "illegal multibyte sequence or invalid state";
else if (x == err_incomplete)
return "incomplete multibyte sequence";
return "?";
}
static constexpr bool big_endian(void) {
return (BYTE_ORDER == BIG_ENDIAN);
}
public:
size_t dst_adv = 0;
size_t src_adv = 0;
public:
static constexpr int err_noinit = -EBADF;
static constexpr int err_noroom = -E2BIG;
static constexpr int err_notvalid = -EILSEQ;
static constexpr int err_incomplete = -EINVAL;
};
template <typename srcT,typename dstT> class _Iconv : public _Iconv_CommonBase {
public:
/* NTS: The C++ standard defines std::string as std::basic_string<char>.
* These typedefs will match if srcT = char and dstT = char */
@@ -170,20 +199,6 @@ public:
return dst_adv;
}
public:
static const char *errstring(int x) {
if (x >= 0)
return "no error";
else if (x == err_noinit)
return "not initialized";
else if (x == err_noroom)
return "out of room";
else if (x == err_notvalid)
return "illegal multibyte sequence or invalid state";
else if (x == err_incomplete)
return "incomplete multibyte sequence";
return "?";
}
static _Iconv<srcT,dstT> *create(const char *nw) { /* factory function, wide to char, or char to wide */
const char *wchar_encoding = _get_wchar_encoding();
if (wchar_encoding == NULL) return NULL;
@@ -221,9 +236,6 @@ private:
return wcslen(s);
}
private:
static constexpr bool big_endian(void) {
return (BYTE_ORDER == BIG_ENDIAN);
}
static const char *_get_wchar_encoding(void) {
if (sizeof(wchar_t) == 4)
return big_endian() ? "UTF-32BE" : "UTF-32LE";
@@ -238,18 +250,11 @@ private:
void set_src(const src_string &src) { /* PRIVATE: External use can easily cause use-after-free bugs */
set_src(src.c_str(),src.length());
}
public:
static constexpr int err_noinit = -EBADF;
static constexpr int err_noroom = -E2BIG;
static constexpr int err_notvalid = -EILSEQ;
static constexpr int err_incomplete = -EINVAL;
private:
dstT* dst_ptr = NULL;
dstT* dst_ptr_fence = NULL;
const srcT* src_ptr = NULL;
const srcT* src_ptr_fence = NULL;
size_t dst_adv = 0;
size_t src_adv = 0;
iconv_t context = NULL;
};