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"""
python support for XPA client access
"""

import os
import platform
import sys
import ctypes
import ctypes.util

# look for the shared library in sys.path
def _find_shlib(_libbase):
    _ulist=platform.uname()
    if _ulist[0] == 'Darwin':
        _libname = 'lib' + _libbase + '.dylib'
    elif _ulist[0] == 'Windows':
        _libname = 'libxpa.dll'
    else:
        _libname = 'lib' + _libbase + '.so'
    for _dir in sys.path:
        _fname = os.path.join(_dir, _libname)
        if os.path.exists(_fname):
            return _fname
    # try current directory
    _fname = os.path.join('./xpa-2.1.15', _libname)
    if os.path.exists(_fname):
        return _fname
    return None

_libpath='libxpa.so.1'
if _libpath:
    libxpa=ctypes.cdll.LoadLibrary(_libpath)
    _ulist=platform.uname()
    if _ulist[0] == 'Windows':
        libc=ctypes.cdll.msvcrt
    else:
        libc=ctypes.cdll.LoadLibrary(None)
else:
    raise ImportError, "can't find XPA shared library"
	
# factory routine returning pointer to byte array
c_byte_p = ctypes.POINTER(ctypes.c_byte)

# free C buffers returned by xpa calls
def _freebufs(p_arr, len):
    for i in range(len):
        if p_arr[i]:
            libc.free(p_arr[i])

## XPA XPAOpen(char *mode);
libxpa.XPAOpen.restype = ctypes.c_void_p
libxpa.XPAOpen.argtypes = [ctypes.c_char_p]
def XPAOpen(mode):
    return libxpa.XPAOpen(mode)


## void XPAClose(XPA xpa);
libxpa.XPAClose.argtypes = [ctypes.c_void_p]
def XPAClose(xpa):
    libxpa.XPAClose(xpa)

## int XPAGet(XPA xpa, char *template, char *paramlist, char *mode,
##            char **bufs, int *lens, char **names, char **messages, int n);
libxpa.XPAGet.restype = ctypes.c_int
def XPAGet(xpa, target, paramlist, mode, bufs, lens, names, messages, n):
    libxpa.XPAGet.argtypes = [ctypes.c_void_p, ctypes.c_char_p,     \
                              ctypes.c_char_p, ctypes.c_char_p,     \
                              c_byte_p*n, ctypes.c_int*n, 	    \
                              c_byte_p*n, c_byte_p*n, 		    \
                              ctypes.c_int]
    return libxpa.XPAGet(xpa, target, paramlist, mode,		    \
                         bufs, lens, names, messages, n)

## int XPASet(XPA xpa,
##             char *template, char *paramlist, char *mode,
##             char *buf, int len, char **names, char **messages,
##             int n);
XPASet = libxpa.XPASet
libxpa.XPASet.restype = ctypes.c_int
def XPASet(xpa, target, paramlist, mode, buf, blen, names, messages, n):
    libxpa.XPASet.argtypes = [ctypes.c_void_p, ctypes.c_char_p,     \
                              ctypes.c_char_p, ctypes.c_char_p,     \
                              ctypes.c_char_p, ctypes.c_int,        \
                              c_byte_p*n, c_byte_p*n,   	    \
                              ctypes.c_int]
    return libxpa.XPASet(xpa, target, paramlist, mode,		    \
                         buf, blen, names, messages, n)

## int XPAInfo(XPA xpa,
##              char *template, char *paramlist, char *mode,
##              char **names, char **messages, int n);
XPAInfo = libxpa.XPAInfo
libxpa.XPAInfo.restype = ctypes.c_int
def XPAInfo(xpa, target, paramlist, mode, names, messages, n):
    libxpa.XPAInfo.argtypes = [ctypes.c_void_p, ctypes.c_char_p,    \
                               ctypes.c_char_p, ctypes.c_char_p,    \
                               c_byte_p*n, c_byte_p*n, \
                               ctypes.c_int]
    return libxpa.XPAInfo(xpa, target, paramlist, mode, names, messages, n)

## int XPAAccess(XPA xpa,
##              char *template, char *paramlist, char *mode,
##              char **names, char **messages, int n);
libxpa.XPAAccess.restype = ctypes.c_int
def XPAAccess(xpa, target, paramlist, mode, names, messages, n):
    libxpa.XPAAccess.argtypes = [ctypes.c_void_p, ctypes.c_char_p,  \
                                 ctypes.c_char_p, ctypes.c_char_p,  \
                                 c_byte_p*n, c_byte_p*n, 	    \
                                 ctypes.c_int]
    return libxpa.XPAAccess(xpa, target, paramlist, mode,	    \
                            names, messages, n)

# default value for n (max number of access points)
xpa_n = 1024

def xpaget(target, plist=None, n=xpa_n):
    buf_t = c_byte_p*n
    bufs = buf_t()
    names = buf_t()
    errs = buf_t()
    int_t = ctypes.c_int*n
    lens = int_t()
    errmsg = ''
    got = XPAGet(None, target, plist, None, bufs, lens, names, errs, n)
    if got:
	buf = []
     	for i in range(got):
            if lens[i]:
                cur=ctypes.string_at(bufs[i], lens[i])
                buf.append(cur)
	for i in range(got):
	    if errs[i]: errmsg += ctypes.string_at(errs[i]).strip() + '\n'
    else:
        buf = None
    _freebufs(bufs, n)
    _freebufs(names, n)
    _freebufs(errs, n)
    if errmsg: raise ValueError, errmsg
    return buf

def xpaset(target, plist=None, buf=None, blen=-1, n=xpa_n):
    if blen < 0:
	if buf != None:
		blen = len(buf)
	else:
		blen = 0
    buf_t = c_byte_p*n
    names = buf_t()
    errs = buf_t()
    errmsg = ''
    got = XPASet(None, target, plist, None, buf, blen, names, errs, n)
    for i in range(got):
        if errs[i]: errmsg += ctypes.string_at(errs[i]).strip() + '\n'
    _freebufs(names, n)
    _freebufs(errs, n)
    if errmsg: raise ValueError, errmsg
    return got

def xpainfo(target, plist=None, n=xpa_n):
    buf_t = c_byte_p*n
    names = buf_t()
    errs = buf_t()
    errmsg = ''
    got = XPAInfo(None, target, plist, None, names, errs, n)
    for i in range(got):
        if errs[i]: errmsg += ctypes.string_at(errs[i]).strip() + '\n'
    _freebufs(names, n)
    _freebufs(errs, n)
    if errmsg: raise ValueError, errmsg
    return got

def xpaaccess(target, plist=None, n=xpa_n):
    buf_t = c_byte_p*n
    names = buf_t()
    errs = buf_t()
    errmsg = ''
    got = XPAAccess(None, target, plist, None, names, errs, n)
    if got:
        buf = []
        for i in range(got):
            if names[i]:
                cur = ctypes.string_at(names[i]).strip()
                buf.append(cur)
	for i in range(got):
            if errs[i]: errmsg += ctypes.string_at(errs[i]).strip() + '\n'
    else:
        buf = None
    _freebufs(names, n)
    _freebufs(errs, n)
    if errmsg: raise ValueError, errmsg
    return buf