97     size_t	bi_used;    // bytes written to/read from bi_buffer
98     size_t	bi_avail;   // bytes available in bi_buffer
117 static int undo_read(bufinfo_T *bi, char_u *buffer, size_t size);
928 undo_write(bufinfo_T *bi, char_u *ptr, size_t len)  in undo_write()
933 	size_t	len_todo = len;  in undo_write()
938 	    size_t	n = CRYPT_BUF_SIZE - bi->bi_used;  in undo_write()
955     if (fwrite(ptr, len, (size_t)1, bi->bi_fp) != 1)  in undo_write()
969 	if (fwrite(bi->bi_buffer, bi->bi_used, (size_t)1, bi->bi_fp) != 1)  in undo_flush()
982 fwrite_crypt(bufinfo_T *bi, char_u *ptr, size_t len)  in fwrite_crypt()
987     size_t  i;  in fwrite_crypt()
1003 	i = fwrite(copy, len, (size_t)1, bi->bi_fp);  in fwrite_crypt()
1026     return undo_write(bi, buf, (size_t)len);  in undo_write_bytes()
1048 	undo_read(bi, buf, (size_t)4);  in undo_read_4c()
1065 	undo_read(bi, buf, (size_t)2);  in undo_read_2c()
1081 	undo_read(bi, buf, (size_t)1);  in undo_read_byte()
1098 	undo_read(bi, buf, (size_t)8);  in undo_read_time()
1112 undo_read(bufinfo_T *bi, char_u *buffer, size_t size)  in undo_read()
1124 	    size_t n;  in undo_read()
1128 		n = fread(bi->bi_buffer, 1, (size_t)CRYPT_BUF_SIZE, bi->bi_fp);  in undo_read()
1149     if (fread(buffer, (size_t)size, 1, bi->bi_fp) != 1)  in undo_read()
1201     if (fwrite(UF_START_MAGIC, (size_t)UF_START_MAGIC_LEN, (size_t)1, fp) != 1)  in serialize_header()
1217 	len = (long)fwrite(header, (size_t)header_len, (size_t)1, fp);  in serialize_header()
1245     if (undo_write(bi, hash, (size_t)UNDO_HASH_SIZE) == FAIL)  in serialize_header()
1253     if (len > 0 && fwrite_crypt(bi, buf->b_u_line_ptr.ul_line, (size_t)len)  in serialize_header()
1421     size_t	len;  in serialize_uep()
1963     if (undo_read(&bi, read_hash, (size_t)UNDO_HASH_SIZE) == FAIL)  in u_read_undo()