Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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52 lines
1.3 KiB
52 lines
1.3 KiB
2 years ago
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <iconv.h>
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static iconv_t s_cd;
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/* Call iconv_open only once so the benchmark will be faster? */
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static void __attribute__ ((constructor)) init_iconv(void)
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{
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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s_cd = iconv_open("UTF-16LE", "UTF-8");
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#else
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s_cd = iconv_open("UTF-16BE", "UTF-8");
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#endif
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if (s_cd == (iconv_t)-1) {
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perror("iconv_open");
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exit(1);
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}
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}
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/*
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* Parameters:
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* - buf8, len8: input utf-8 string
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* - buf16: buffer to store decoded utf-16 string
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* - *len16: on entry - utf-16 buffer length in bytes
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* on exit - length in bytes of valid decoded utf-16 string
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* Returns:
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* - 0: success
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* - >0: error position of input utf-8 string
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* - -1: utf-16 buffer overflow
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* LE/BE depends on host
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*/
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int utf8_to16_iconv(const unsigned char *buf8, size_t len8,
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unsigned short *buf16, size_t *len16)
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{
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size_t ret, len16_save = *len16;
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const unsigned char *buf8_0 = buf8;
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ret = iconv(s_cd, (char **)&buf8, &len8, (char **)&buf16, len16);
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*len16 = len16_save - *len16;
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if (ret != (size_t)-1)
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return 0;
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if (errno == E2BIG)
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return -1; /* Output buffer full */
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return buf8 - buf8_0 + 1; /* EILSEQ, EINVAL, error position */
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}
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