diff options
author | Stefano Sabatini <stefasab@gmail.com> | 2013-10-03 03:21:40 +0400 |
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committer | Stefano Sabatini <stefasab@gmail.com> | 2013-11-22 19:51:05 +0400 |
commit | 68590650f05f2bf97766362f2817372987c8a52e (patch) | |
tree | b5b0292ed90bb1db4172f646e5e8e59c4326f31c /libavutil/avstring.c | |
parent | e782eea183ba3c03f5179ac83f85e25ae9c1290f (diff) |
lavu/avstring: add av_utf8_decode() function
Diffstat (limited to 'libavutil/avstring.c')
-rw-r--r-- | libavutil/avstring.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/libavutil/avstring.c b/libavutil/avstring.c index eed58fae1e..20931071b3 100644 --- a/libavutil/avstring.c +++ b/libavutil/avstring.c @@ -307,6 +307,70 @@ int av_isxdigit(int c) return av_isdigit(c) || (c >= 'a' && c <= 'f'); } +int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end, + unsigned int flags) +{ + const uint8_t *p = *bufp; + uint32_t top; + uint64_t code; + int ret = 0; + + if (p >= buf_end) + return 0; + + code = *p++; + + /* first sequence byte starts with 10, or is 1111-1110 or 1111-1111, + which is not admitted */ + if ((code & 0xc0) == 0x80 || code >= 0xFE) { + ret = AVERROR(EILSEQ); + goto end; + } + top = (code & 128) >> 1; + + while (code & top) { + int tmp; + if (p >= buf_end) { + ret = AVERROR(EILSEQ); /* incomplete sequence */ + goto end; + } + + /* we assume the byte to be in the form 10xx-xxxx */ + tmp = *p++ - 128; /* strip leading 1 */ + if (tmp>>6) { + ret = AVERROR(EILSEQ); + goto end; + } + code = (code<<6) + tmp; + top <<= 5; + } + code &= (top << 1) - 1; + + if (code >= 1<<31) { + ret = AVERROR(EILSEQ); /* out-of-range value */ + goto end; + } + + *codep = code; + + if (code > 0x10FFFF && + !(flags & AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES)) + ret = AVERROR(EILSEQ); + if (code < 0x20 && code != 0x9 && code != 0xA && code != 0xD && + flags & AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES) + ret = AVERROR(EILSEQ); + if (code >= 0xD800 && code <= 0xDFFF && + !(flags & AV_UTF8_FLAG_ACCEPT_SURROGATES)) + ret = AVERROR(EILSEQ); + if (code == 0xFFFE || code == 0xFFFF && + (!flags & AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS)) + ret = AVERROR(EILSEQ); + +end: + *bufp = p; + return ret; +} + #ifdef TEST int main(void) |