kopia lustrzana https://gitlab.com/sane-project/standard
Initial revision
Petter Reinholdtsen
Olaf Meeuwissen
commit
64b58898ed
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%%For: davidm@panda.mosberger (David Mosberger-Tang)
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%!PS-Adobe-2.0 EPSF-2.0
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%%Title: flow.fig
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%%CreationDate: Tue Dec 3 22:09:10 1996
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%%For: davidm@panda.mosberger (David Mosberger-Tang)
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restore
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@ -0,0 +1,40 @@
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#FIG 3.1
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Portrait
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Center
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Inches
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1200 2
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6 4200 7305 9945 7575
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-6
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3900 4800 10200 4800 10200 8250 3900 8250 3900 4800
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10350 3000 10425 3075 10425 4500 10350 4575
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gr
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9599 1582 m
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9599 2482 m
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rs
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@ -0,0 +1,79 @@
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#FIG 3.1
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Landscape
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Center
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||||
Inches
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||||
1200 2
|
||||
6 10500 4500 12300 5400
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2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
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10650 4785 12150 4785 12150 5385 10650 5385 10650 4785
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4 1 -1 0 0 16 18 0.0000 4 210 660 11399 5182 qcam\001
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-6
|
||||
6 7200 4500 9000 5400
|
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2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
|
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7350 4785 8850 4785 8850 5385 7350 5385 7350 4785
|
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4 1 -1 0 0 16 18 0.0000 4 270 315 8099 5182 hp\001
|
||||
-6
|
||||
2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
|
||||
2250 1185 3750 1185 3750 1785 2250 1785 2250 1185
|
||||
2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
|
||||
450 2985 1950 2985 1950 3585 450 3585 450 2985
|
||||
2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
|
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2250 2985 3750 2985 3750 3585 2250 3585 2250 2985
|
||||
2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
|
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4050 2985 5550 2985 5550 3585 4050 3585 4050 2985
|
||||
2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
|
||||
8850 1185 10350 1185 10350 1785 8850 1785 8850 1185
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
2700 1800 1200 3000
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
3000 1800 3000 3000
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
3300 1800 4800 3000
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
9600 1800 9600 2100
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
9450 2700 8100 4800
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
11400 4200 11400 4800
|
||||
2 2 0 0 0 0 10 0 2 0.000 0 0 -1 0 0 5
|
||||
5700 3825 300 3825 300 300 5700 300 5700 3825
|
||||
2 2 0 0 0 0 10 0 2 0.000 0 0 -1 0 0 5
|
||||
12300 5550 7200 5550 7200 300 12300 300 12300 5550
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
1200 3600 1200 4200
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
3000 3600 3000 4125
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
7875 5400 7350 5850
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
8250 5400 8775 5850
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
11475 5400 11475 5850
|
||||
2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
|
||||
8850 2100 10350 2100 10350 2700 8850 2700 8850 2100
|
||||
2 2 0 2 -1 7 0 0 -1 0.000 0 0 -1 0 0 5
|
||||
10650 3600 12150 3600 12150 4200 10650 4200 10650 3600
|
||||
2 1 0 1 -1 7 0 0 -1 0.000 0 0 -1 0 0 2
|
||||
9750 2700 11400 3600
|
||||
3 2 0 1 -1 7 0 0 -1 0.000 0 0 0 7
|
||||
4800 3600 4275 4500 5025 5475 6150 4575 6525 1350 9450 900
|
||||
9600 1200
|
||||
0.00 0.00 4390.23 4024.37 4258.98 4249.38 4300.21 4894.51
|
||||
4554.60 5418.20 5575.94 5541.53 5962.09 4914.18 6573.46 3810.63
|
||||
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|
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9561.99 1013.52 0.00 0.00
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|
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|
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|
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
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|
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|
||||
|
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@ -0,0 +1,178 @@
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#FIG 3.1
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Portrait
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Center
|
||||
Inches
|
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1200 2
|
||||
6 1725 450 5925 1650
|
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6 1800 975 3150 1350
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||||
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|
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|
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@ -0,0 +1,117 @@
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|
|
@ -0,0 +1,443 @@
|
|||
\chapter{Network Protocol}\label{chap:net}
|
||||
|
||||
The SANE interface has been designed to facilitate network access to
|
||||
image acquisition devices. In particular, most SANE implementations
|
||||
are expected to support a network backend (net client) and a
|
||||
corresponding network daemon (net server) that allows accessing image
|
||||
acquisition devices through a network connection. Network access is
|
||||
useful in several situations:
|
||||
\begin{itemize}
|
||||
|
||||
\item To provide controlled access to resources that are inaccessible
|
||||
to a regular user. For example, a user may want to access a device
|
||||
on a host where she has no account on. With the network protocol,
|
||||
it is possible to allow certain users to access scanners without
|
||||
giving them full access to the system.
|
||||
|
||||
Controlling access through the network daemon can be useful even in
|
||||
the local case: for example, certain backends may require root
|
||||
privileges to access a device. Rather than installing each frontend
|
||||
as setuid-root, a system administrator could instead install the
|
||||
SANE network daemon as setuid-root. This enables regular users to
|
||||
access the privileged device through the SANE daemon (which,
|
||||
presumably, supports a more fine-grained access control mechanism
|
||||
than the simple setuid approach). This has the added benefit that
|
||||
the system administrator only needs to trust the SANE daemon, not
|
||||
each and every frontend that may need access to the privileged
|
||||
device.
|
||||
|
||||
\item Network access provides a sense of ubiquity of the available
|
||||
image acquisition devices. For example, in a local area network
|
||||
environment, this allows a user to log onto any machine and have
|
||||
convenient access to any resource available to any machine on the
|
||||
network (subject to permission constraints).
|
||||
|
||||
\item For devices that do not require physical access when used (e.g.,
|
||||
video cameras), network access allows a user to control and use
|
||||
these devices without being in physical proximity. Indeed, if such
|
||||
devices are connected to the Internet, access from any place in the
|
||||
world is possible.
|
||||
|
||||
\end{itemize}
|
||||
|
||||
The network protocol described in this chapter has been design with
|
||||
the following goals in mind:
|
||||
\begin{enumerate}
|
||||
|
||||
\item Image transmission should be efficient (have low encoding
|
||||
overhead).
|
||||
|
||||
\item Accessing option descriptors on the client side must be
|
||||
efficient (since this is a very common operation).
|
||||
|
||||
\item Other operations, such as setting or inquiring the value of an
|
||||
option are less performance critical since they typically require
|
||||
explicit user action.
|
||||
|
||||
\item The network protocol should be simple and easy to implement on
|
||||
any host architecture and any programming language.
|
||||
|
||||
\end{enumerate}
|
||||
The SANE protocol can be run across any transport protocol that
|
||||
provides reliable data delivery. While SANE does not specify a
|
||||
specific transport protocol, it is expected that TCP/IP will be among
|
||||
the most commonly used protocols.
|
||||
|
||||
\section{Data Type Encoding}
|
||||
|
||||
\subsection{Primitive Data Types}
|
||||
|
||||
The four primitive types of the SANE standard are encoded as follows:
|
||||
\begin{description}
|
||||
|
||||
\item[\code{\defn{SANE\_Byte}}:] A byte is encoded as an 8 bit value.
|
||||
Since the transport protocol is assumed to be byte-orientd, the bit
|
||||
order is irrelevant.
|
||||
|
||||
\item[\code{\defn{SANE\_Word}}:] A word is encoded as 4 bytes (32
|
||||
bits). The bytes are ordered from most-significant to
|
||||
least-significant byte (big-endian byte-order).
|
||||
|
||||
\item[\code{\defn{SANE\_Char}}:] A character is currently encoded as an 8-bit
|
||||
ISO LATIN-1 value. An extension to support wider character sets (16 or 32
|
||||
bits) is planned for the future, but not supported at this point.
|
||||
|
||||
\item[\code{\defn{SANE\_String}}:] A string pointer is encoded as a
|
||||
\code{SANE\_Char} array. The trailing NUL byte is considered part
|
||||
of the array and a \code{NULL} pointer is encoded as a zero-length
|
||||
array.
|
||||
|
||||
\item[\code{\defn{SANE\_Handle}}:] A handle is encoded like a word.
|
||||
The network backend needs to take care of converting these integer
|
||||
values to the opaque pointer values that are presented to the user
|
||||
of the network backend. Similarly, the SANE daemon needs to take
|
||||
care of converting the opaque pointer values it receives from its
|
||||
backends into 32-bit integers suitable for use for network encoding.
|
||||
|
||||
\item[{\em\defn{enumeration types}}:] Enumeration types are encoded
|
||||
like words.
|
||||
|
||||
\end{description}
|
||||
|
||||
\subsection{Type Constructors}
|
||||
|
||||
Closely following the type constructors of the C language, the SANE network
|
||||
protocol supports the following four constructors:
|
||||
\begin{description}
|
||||
|
||||
\item[{\em\defn{pointer}}:] A pointer is encoded by a word that indicates
|
||||
whether the pointer is a NULL-pointer which is then followed by the
|
||||
value that the pointer points to (in the case of a non-NULL pointer;
|
||||
in the case of a NULL pointer, no bytes are encoded for the pointer
|
||||
value).
|
||||
|
||||
\item[{\em\defn{array}}:] An array is encoded by a word that indicates
|
||||
the length of the array followed by the values of the elements in
|
||||
the array. The length may be zero in which case no bytes are
|
||||
encoded for the element values.
|
||||
|
||||
\item[{\em\defn{structure}}:] A structure is encoded by simply encoding the
|
||||
structure members in the order in which they appear in the
|
||||
corresponding C type declaration.
|
||||
|
||||
\item[{\em\defn{union}}:] A union must always be accompanied by a tag
|
||||
value that indicates which of the union members is the currently the
|
||||
active one. For this reason, the union itself is encoded simply by
|
||||
encoding the value of the currently active member.
|
||||
|
||||
\end{description}
|
||||
|
||||
Note that for type constructors, the pointer, element, or member
|
||||
values themselves may have a constructed type. Thus, the above rules
|
||||
should be applied recursively until a sequence of primitive types has
|
||||
been found.
|
||||
|
||||
Also SANE had no need for encoding of circular structures. This
|
||||
greatly simplifies the network protocol.
|
||||
|
||||
\section{Remote Procedure Call Requests}
|
||||
|
||||
The SANE network protocol is a client/server-style remote procedure
|
||||
call (RPC) protocol. This means that all activity is initiated by the
|
||||
client side (the network backend)---a server is restricted to
|
||||
answering request by the client.
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_INIT}}}
|
||||
|
||||
This RPC establishes a connection to a particular SANE network daemon.
|
||||
It must be the first call in a SANE network session. The parameter
|
||||
and reply arguments for this call are shown in the table below:
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_Word version\_code} & \code{SANE\_Word status} \\
|
||||
\code{SANE\_String user\_name} & \code{SANE\_Word version\_code} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{version\_code} argument in the request is the SANE
|
||||
version-code of the network backend that is contacting the network
|
||||
daemon (see Section~\ref{sec:saneversioncode}). The
|
||||
``build-revision'' in the version code is used to hold the network
|
||||
protocol version. The SANE network daemon receiving such a request
|
||||
must make sure that the network protocol version corresponds to a
|
||||
supported version since otherwise the encoding of the network stream
|
||||
may be incompatible (even though the SANE interface itself may be
|
||||
compatible). The \code{user\_name} argument is the name of the user
|
||||
on whose behalf this call is being performed. If the network backend
|
||||
cannot determine a user-name, it passes a \code{NULL} pointer for this
|
||||
argument. No trust should be placed in the authenticity of this
|
||||
user-name. The intent of this string is to provide more convenience
|
||||
to the user. E.g., it could be used as the default-user name in
|
||||
subsequent authentication calls.
|
||||
|
||||
In the reply, \code{status} indicates the completion status. If the
|
||||
value is anything other than \code{SANE\_STA\-TUS\_SUCCESS}, the
|
||||
remainder of the reply has undefined values.\footnote{The sane network
|
||||
daemon should be careful not to leak information in the undefined
|
||||
portion of the reply.} The \code{version\_code} argument returns the
|
||||
SANE version-code that the network daemon supports. See the comments
|
||||
in the previous paragraph on the meaning of the build-revision in this
|
||||
version code.
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_GET\_DEVICES}}}
|
||||
|
||||
This RPC is used to obtain the list of devices accessible by the SANE
|
||||
daemon.
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{void} & \code{SANE\_Word status} \\
|
||||
& \code{SANE\_Device ***device\_list} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
There are no arguments in the request for this call.
|
||||
|
||||
In the reply, \code{status} indicates the completion status. If the
|
||||
value is anything other than \code{SANE\_STA\-TUS\_SUCCESS}, the
|
||||
remainder of the reply has undefined values. The \code{device\_list}
|
||||
argument is a pointer to a \code{NULL}-terminated array of
|
||||
\code{SANE\_Device} pointers.
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_OPEN}}}
|
||||
|
||||
This RPC is used to open a connection to a remote SANE device.
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_String device\_name} & \code{SANE\_Word status} \\
|
||||
& \code{SANE\_Word handle} \\
|
||||
& \code{SANE\_String resource} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{device\_name} argument specifies the name of the device to
|
||||
open.
|
||||
|
||||
In the reply, \code{status} indicates the completion status. If the
|
||||
value is anything other than \code{SANE\_STA\-TUS\_SUCCESS}, the
|
||||
remainder of the reply has undefined values. The \code{handle}
|
||||
argument specifies the device handle that uniquely identifies the
|
||||
connection. The \code{resource} argument is used to request
|
||||
authentication. If it has a non-\code{NULL} value, the network
|
||||
backend should authenticate the specified resource and then retry this
|
||||
operation (see Section~\ref{sec:authorization} for details on how to
|
||||
authorize a resource).
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_CLOSE}}}
|
||||
|
||||
This RPC is used to close a connection to a remote SANE device.
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_Word handle} & \code{SANE\_Word dummy} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{handle} argument identifies the connection that should be
|
||||
closed.
|
||||
|
||||
In the reply, the \code{dummy} argument is unused. Its purpose is to
|
||||
ensure proper synchronization (without it, a net client would not be
|
||||
able to determine when the RPC has completed).
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_GET\_OPTION\_DESCRIPTORS}}}
|
||||
|
||||
This RPC is used to obtain {\em all\/} the option descriptors for a
|
||||
remote SANE device.
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_Word handle} & \code{Option\_Descriptor\_Array odesc} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{handle} argument identifies the remote device whose option
|
||||
descriptors should be obtained.
|
||||
|
||||
In the reply, the \code{odesc} argument is used to return the array of
|
||||
option descriptors. The option descriptor array has the following
|
||||
structure:
|
||||
\begin{quote}\index{Option\_Descriptor\_Array}
|
||||
\begin{verbatim}
|
||||
struct Option_Descriptor_Array
|
||||
{
|
||||
SANE_Word num_options;
|
||||
SANE_Option_Descriptor **desc;
|
||||
};
|
||||
\end{verbatim}
|
||||
\end{quote}
|
||||
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_CONTROL\_OPTION}}}
|
||||
|
||||
This RPC is used to control (inquire, set, or set to automatic) a
|
||||
specific option of a remote SANE device.
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_Word handle} & \code{SANE\_Status status} \\
|
||||
\code{SANE\_Word option} & \code{SANE\_Word info} \\
|
||||
\code{SANE\_Word action} & \code{SANE\_Word value\_type} \\
|
||||
\code{SANE\_Word value\_type} & \code{SANE\_Word value\_size} \\
|
||||
\code{SANE\_Word value\_size} & \code{void *value} \\
|
||||
\code{void *value} & \code{SANE\_String *resource} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{handle} argument identifies the remote device whose option
|
||||
should be controlled. Argument \code{option} is the number (index) of
|
||||
the option that should be controlled. Argument \code{action}
|
||||
specifies what action should be taken (get, set, or set automatic).
|
||||
Argument \code{value\_type} specifies the type of the option value
|
||||
(must be one of \code{SANE\_TYPE\_BOOL}, \code{SANE\_TYPE\_INT},
|
||||
\code{SANE\_TYPE\_FIXED}, \code{SANE\_TYPE\_STR\-ING},
|
||||
\code{SANE\_TYPE\_BUTTON}). Argument \code{value\_size} specifies
|
||||
the size of the option value in number of bytes (see
|
||||
Section~\ref{sec:valuesize} for the precise meaning of this value).
|
||||
Finally, argument \code{value} is a pointer to the option value. It
|
||||
must be a writeable area that is at least \code{value\_size} bytes
|
||||
large. (Note that this area must be writable even if the action is to
|
||||
set the option value. This is because the backend may not be able to
|
||||
set the exact option value, in which case the option value is used to
|
||||
return the next best value that the backend has chosen.)
|
||||
|
||||
In the reply, argument \code{resource} is set to the name of the
|
||||
resource that must be authorized before this call can be retried. If
|
||||
this value is non-\code{NULL}, all other arguments have undefined
|
||||
values (see Section~\ref{sec:authorization} for details on how to
|
||||
authorize a resource). Argument \code{status} indicates the
|
||||
completion status. If the value is anything other than
|
||||
\code{SANE\_STA\-TUS\_SUCCESS}, the remainder of the reply has undefined
|
||||
values. The \code{info} argument returns the information on how well
|
||||
the backend was able to satisfy the request. For details, see the
|
||||
description of the corresponding argument in
|
||||
Section~\ref{sec:control}. Arguments \code{value\_type} and
|
||||
\code{value\_size} have the same values as the arguments by the same
|
||||
name in corresponding request. The values are repeated here to ensure
|
||||
that both the request and the reply are self-contained (i.e., they can
|
||||
be encoded and decoded independently). Argument \code{value} is holds
|
||||
the value of the option that has become effective as a result of this
|
||||
RPC.
|
||||
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_GET\_PARAMETERS}}}
|
||||
|
||||
This RPC is used to obtain the scan parameters of a remote SANE
|
||||
device.
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_Word handle} & \code{SANE\_Status status} \\
|
||||
& \code{SANE\_Parameters params} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{handle} argument identifies the connection to the remote
|
||||
device whose scan parameters should be returned.
|
||||
|
||||
In the reply, \code{status} indicates the completion status. If the
|
||||
value is anything other than \code{SANE\_STA\-TUS\_SUC\-CESS}, the
|
||||
remainder of the reply has undefined values. The argument
|
||||
\code{params} is used to return the scan parameters.
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_START}}}
|
||||
|
||||
This RPC is used to start image acquisition (scanning).
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_Word handle} & \code{SANE\_Status status} \\
|
||||
& \code{SANE\_Word port} \\
|
||||
& \code{SANE\_Word byte\_order} \\
|
||||
& \code{SANE\_String resource} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{handle} argument identifies the connection to the remote
|
||||
device from which the image should be acquired.
|
||||
|
||||
In the reply, argument \code{resource} is set to the name of the
|
||||
resource that must be authorized before this call can be retried. If
|
||||
this value is non-\code{NULL}, all other arguments have undefined
|
||||
values (see Section~\ref{sec:authorization} for details on how to
|
||||
authorize a resource). Argument, \code{status} indicates the
|
||||
completion status. If the value is anything other than
|
||||
\code{SANE\_STA\-TUS\_SUCCESS}, the remainder of the reply has
|
||||
undefined values. The argument \code{port} returns the port number
|
||||
from which the image data will be available. To read the image data,
|
||||
a network client must connect to the remote host at the indicated port
|
||||
number. Through this port, the image data is transmitted as a
|
||||
sequence of data records. Each record starts with the data length in
|
||||
bytes. The data length is transmitted as a sequence of four bytes.
|
||||
These bytes should be interpreted as an unsigned integer in big-endian
|
||||
format. The four length bytes are followed by the number of data
|
||||
bytes indicated by the length. Except for byte-order, the data is in
|
||||
the same format as defined for \code{sane\_read()}. Since some
|
||||
records may contain no data at all, a length value of zero is
|
||||
perfectly valid. The special length value of \code{0xffffffff} is
|
||||
used to indicate the end of the data stream. That is, after receiving
|
||||
a record length of \code{0xffffffff}, the network client should close
|
||||
the data connection and stop reading data.
|
||||
|
||||
Argument \code{byte\_order} specifies the byte-order of the image
|
||||
data. A value of 0x1234 indicates little-endian format, a value of
|
||||
0x4321 indicates big-endian format. All other values are presently
|
||||
undefined and reserved for future enhancements of this protocol. The
|
||||
intent is that a network server sends data in its own byte-order and
|
||||
the client is responsible for adjusting the byte-order, if necessary.
|
||||
This approach causes no unnecessary overheads in the case where the
|
||||
server and client byte-order match and puts the extra burden on the
|
||||
client side when there is a byte-order mismatch. Putting the burden
|
||||
on the client-side improves the scalability properties of this
|
||||
protocol.
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_CANCEL}}}
|
||||
|
||||
This RPC is used to cancel the current operation of a remote SANE
|
||||
device.
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_Word handle} & \code{SANE\_Word dummy} \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{handle} argument identifies the connection whose operation
|
||||
should be cancelled.
|
||||
|
||||
In the reply, the \code{dummy} argument is unused. Its purpose is to
|
||||
ensure proper synchronization (without it, a net client would not be
|
||||
able to determine when the RPC has completed).
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_AUTHORIZE}}}\label{sec:authorization}
|
||||
\index{network authorization}
|
||||
|
||||
This RPC is used to pass authorization data from the net client to the
|
||||
net server.
|
||||
\begin{center}
|
||||
\begin{tabular}{ll}
|
||||
{\bf request:} & {\bf reply:} \\
|
||||
\code{SANE\_String resource} & \code{SANE\_Word dummy} \\
|
||||
\code{SANE\_String username} & \\
|
||||
\code{SANE\_String password} & \\
|
||||
\end{tabular}
|
||||
\end{center}
|
||||
The \code{resource} argument specifies the name of the resource to be
|
||||
authorized. This argument should be set to the string returned in the
|
||||
\code{resource} argument of the RPC reply that required this
|
||||
authorization call. The \code{username} and \code{password} are the
|
||||
name of the user that is accessing the resource and the password for
|
||||
the specified resource/user pair.\footnote{The username and password
|
||||
should be encrypted before network transmission but currently they
|
||||
are always in plain text.}
|
||||
|
||||
In the reply, \code{dummy} is completely unused. Note that there is
|
||||
no direct failure indication. This is unnecessary since a net client
|
||||
will retry the RPC that resulted in the authorization request until
|
||||
that call succeeds (or until the request is cancelled).
|
||||
|
||||
|
||||
\subsection{\code{\defn{SANE\_NET\_EXIT}}}
|
||||
|
||||
This RPC is used to disconnect a net client from a net server. There
|
||||
are no request or reply arguments in this call. As a result of this
|
||||
call, the connection between the client and the server that was
|
||||
established by the \code{SANE\_NET\_INIT} call will be closed.
|
||||
|
||||
% Local Variables:
|
||||
% mode: latex
|
||||
% TeX-master: "sane.tex"
|
||||
% End:
|
||||
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