Function validate_string

fftools/textformat/avtextformat.c:307–362

}

static inline int validate_string(AVTextFormatContext *tctx, char **dstp, const char *src)
{
    const uint8_t *p, *endp, *srcp = (const uint8_t *)src;
    AVBPrint dstbuf;
    AVBPrint invalid_seq;
    int invalid_chars_nb = 0, ret = 0;

    *dstp = NULL;
    av_bprint_init(&dstbuf, 0, AV_BPRINT_SIZE_UNLIMITED);
    av_bprint_init(&invalid_seq, 0, AV_BPRINT_SIZE_UNLIMITED);

    endp = srcp + strlen(src);
    for (p = srcp; *p;) {
        int32_t code;
        int invalid = 0;
        const uint8_t *p0 = p;

        if (av_utf8_decode(&code, &p, endp, tctx->string_validation_utf8_flags) < 0) {

            av_bprint_clear(&invalid_seq);

            bprint_bytes(&invalid_seq, p0, p - p0);

            av_log(tctx, AV_LOG_DEBUG, "Invalid UTF-8 sequence '%s' found in string '%s'\n", invalid_seq.str, src);
            invalid = 1;
        }

        if (invalid) {
            invalid_chars_nb++;

            switch (tctx->string_validation) {
            case AV_TEXTFORMAT_STRING_VALIDATION_FAIL:
                av_log(tctx, AV_LOG_ERROR, "Invalid UTF-8 sequence found in string '%s'\n", src);
                ret = AVERROR_INVALIDDATA;
                goto end;

            case AV_TEXTFORMAT_STRING_VALIDATION_REPLACE:
                av_bprintf(&dstbuf, "%s", tctx->string_validation_replacement);
                break;
            }
        }

        if (!invalid || tctx->string_validation == AV_TEXTFORMAT_STRING_VALIDATION_IGNORE)
            av_bprint_append_data(&dstbuf, p0, p-p0);
    }

    if (invalid_chars_nb && tctx->string_validation == AV_TEXTFORMAT_STRING_VALIDATION_REPLACE)
        av_log(tctx, AV_LOG_WARNING,
               "%d invalid UTF-8 sequence(s) found in string '%s', replaced with '%s'\n",
               invalid_chars_nb, src, tctx->string_validation_replacement);

end:
    av_bprint_finalize(&dstbuf, dstp);
    av_bprint_finalize(&invalid_seq, NULL);
    return ret;
}

struct unit_value {