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https://github.com/Unidata/netcdf-c.git
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8f2f9b74e3
This is a follow-on in that the old utf8 code was still being used in ncgen to convert utf8->utf16 when converting cdl to Java (see genj.c). The new code apparently has no utf16 support, but it does have utf32 support. Converting utf32 -> utf16 can be approximated by truncating the 32bits to 16 bits, unless the top 16 bits are not zero. This latter condition is unlikely to be common because it implies use of some rather obscure characters. So solution is to convert to utf32 and truncate to 16 bits to get utf16. An error is reported if the high-order truncated 16 bits are not zero. If we get complaints, then I will figure out how to convert full utf32 to a utf16 pair. Also removed the old code from ncgen.
173 lines
4.3 KiB
C
173 lines
4.3 KiB
C
/*
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* Copyright 2017, University Corporation for Atmospheric Research
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* See netcdf/COPYRIGHT file for copying and redistribution conditions.
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*/
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#include "config.h"
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "netcdf.h"
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#include "ncutf8.h"
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#include "utf8proc.h"
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/* Provide a wrapper around whatever utf8 library we use. */
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/*
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* Check validity of a UTF8 encoded null-terminated byte string.
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* Return codes:
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* NC_NOERR -- string is valid utf8
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* NC_ENOMEM -- out of memory
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* NC_EINVAL -- invalid argument or internal error
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* NC_EBADNAME-- not valid utf8
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*/
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int nc_utf8_validate(const unsigned char* name)
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{
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int ncstat = NC_NOERR;
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const nc_utf8proc_uint8_t *str;
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nc_utf8proc_ssize_t nchars = -1;
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nc_utf8proc_int32_t codepoint;
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nc_utf8proc_ssize_t count;
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str = (const nc_utf8proc_uint8_t*)name;
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while(*str) {
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count = nc_utf8proc_iterate(str,nchars,&codepoint);
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if(count < 0) {
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switch (count) {
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case UTF8PROC_ERROR_NOMEM:
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case UTF8PROC_ERROR_OVERFLOW:
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ncstat = NC_ENOMEM;
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break;
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case UTF8PROC_ERROR_INVALIDOPTS:
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ncstat = NC_EINVAL;
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break;
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case UTF8PROC_ERROR_INVALIDUTF8:
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case UTF8PROC_ERROR_NOTASSIGNED:
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default:
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ncstat = NC_EBADNAME;
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break;
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}
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goto done;
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} else { /* move to next char */
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str += count;
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}
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}
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done:
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return ncstat;
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}
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/*
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* Returns a pointer to newly allocated memory of a
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* normalized version of the null-terminated string 'str'.
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* Normalized string is returned in normalp argument;
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* caller must free.
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* Return codes:
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* NC_NOERR -- success
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* NC_ENOMEM -- out of memory
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* NC_EINVAL -- illegal argument or internal error
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* NC_EBADNAME -- other failure
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*/
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int
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nc_utf8_normalize(const unsigned char* utf8, unsigned char** normalp)
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{
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int ncstat = NC_NOERR;
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const nc_utf8proc_uint8_t* str = (const nc_utf8proc_uint8_t*)utf8;
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nc_utf8proc_uint8_t* retval = NULL;
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nc_utf8proc_ssize_t count;
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count = nc_utf8proc_map(str, 0, &retval, UTF8PROC_NULLTERM | UTF8PROC_STABLE | UTF8PROC_COMPOSE);
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if(count < 0) {/* error */
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switch (count) {
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case UTF8PROC_ERROR_NOMEM:
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case UTF8PROC_ERROR_OVERFLOW:
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ncstat = NC_ENOMEM;
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break;
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case UTF8PROC_ERROR_INVALIDOPTS:
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ncstat = NC_EINVAL;
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break;
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case UTF8PROC_ERROR_INVALIDUTF8:
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case UTF8PROC_ERROR_NOTASSIGNED:
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default:
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ncstat = NC_EBADNAME;
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break;
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}
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goto done;
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} else
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if(normalp) *normalp = (unsigned char*)retval;
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done:
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return ncstat;
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}
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/*
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* Convert a normalized utf8 string to utf16. This is approximate
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* because it just does the truncation version of conversion for
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* each 32-bit codepoint to get the corresponding utf16.
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* Return codes:
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* NC_NOERR -- success
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* NC_ENOMEM -- out of memory
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* NC_EINVAL -- invalid argument or internal error
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* NC_EBADNAME-- not valid utf16
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*/
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int nc_utf8_to_utf16(const unsigned char* s8, unsigned short** utf16p, size_t* len16p)
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{
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int ncstat = NC_NOERR;
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const nc_utf8proc_uint8_t *str;
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nc_utf8proc_ssize_t nchars = -1;
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nc_utf8proc_int32_t codepoint;
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nc_utf8proc_ssize_t count;
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size_t len8, len16;
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unsigned short* utf16;
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unsigned short* p16;
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len8 = strlen((char*)s8);
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utf16 = (unsigned short*)malloc(sizeof(unsigned short)*(len8+1));
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if(utf16 == NULL) {
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ncstat = NC_ENOMEM;
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goto done;
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}
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str = (const nc_utf8proc_uint8_t*)s8;
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/* Walk the string and convert each codepoint */
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p16 = utf16;
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len16 = 0;
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while(*str) {
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count = nc_utf8proc_iterate(str,nchars,&codepoint);
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if(count < 0) {
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switch (count) {
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case UTF8PROC_ERROR_NOMEM:
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case UTF8PROC_ERROR_OVERFLOW:
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ncstat = NC_ENOMEM;
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break;
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case UTF8PROC_ERROR_INVALIDOPTS:
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ncstat = NC_EINVAL;
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break;
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case UTF8PROC_ERROR_INVALIDUTF8:
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case UTF8PROC_ERROR_NOTASSIGNED:
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default:
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ncstat = NC_EBADNAME;
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break;
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}
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goto done;
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} else { /* move to next char */
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/* Complain if top 16 bits not zero */
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if((codepoint & 0x0000FFFF) != 0) {
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ncstat = NC_EBADNAME;
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goto done;
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}
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/* Truncate codepoint to 16 bits and store */
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*p16++ = (unsigned short)(codepoint & 0x0000FFFF);
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str += count;
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len16++;
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}
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}
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*p16++ = (unsigned short)0;
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if(utf16p) *utf16p = utf16;
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if(len16p) *len16p = len16;
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done:
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if(ncstat) free(utf16);
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return ncstat;
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}
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