SukmoonLee Blog

    113     if (r->finfo.filetype != 0) {
    114         /*
    115          * ETag gets set to [W/]"inode-size-mtime", modulo any
    116          * FileETag keywords.
    117          */
    118         etag = apr_palloc(r->pool, weak_len + sizeof("\"--\"") +
    119                           3 * CHARS_PER_UINT64 + 1);
    120         next = etag;
    121         if (weak) {
    122             while (*weak) {
    123                 *next++ = *weak++;
    124             }
    125         }
    126         *next++ = '"';
    127         bits_added = 0;
    128         if (etag_bits & ETAG_INODE) {
    129             next = etag_uint64_to_hex(next, r->finfo.inode);
    130             bits_added |= ETAG_INODE;
    131         }
    132         if (etag_bits & ETAG_SIZE) {
    133             if (bits_added != 0) {
    134                 *next++ = '-';
    135             }
    136             next = etag_uint64_to_hex(next, r->finfo.size);
    137             bits_added |= ETAG_SIZE;
    138         }
    139         if (etag_bits & ETAG_MTIME) {
    140             if (bits_added != 0) {
    141                 *next++ = '-';
    142             }
    143             next = etag_uint64_to_hex(next, r->mtime);
    144         }
    145         *next++ = '"';
    146         *next = '\0';
    147     }
    148     else {
    149         /*
    150          * Not a file document, so just use the mtime: [W/]"mtime"
    151          */
    152         etag = apr_palloc(r->pool, weak_len + sizeof("\"\"") +
    153                           CHARS_PER_UINT64 + 1);
    154         next = etag;
    155         if (weak) {
    156             while (*weak) {
    157                 *next++ = *weak++;
    158             }
    159         }
    160         *next++ = '"';
    161         next = etag_uint64_to_hex(next, r->mtime);
    162         *next++ = '"';
    163         *next = '\0';
    164     }