[615] | 1 | #------------------- wrap C/Fortran routines -------------------# |
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| 2 | |
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| 3 | import numpy as np |
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| 4 | from ctypes import * |
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| 5 | |
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| 6 | class Struct: pass |
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| 7 | |
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| 8 | # converts numpy array to void * for calling C/Fortran routines |
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| 9 | def loc(array): return array.ctypes.data_as(c_void_p) |
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| 10 | |
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| 11 | # defines converter functions depending on type of Python argument |
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| 12 | def noop(x): return x |
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| 13 | py2c = { np.ndarray:loc, np.float64:c_double, float:c_double, int:c_int, |
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| 14 | c_void_p:noop, str:noop, c_int:noop } |
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| 15 | |
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| 16 | class Wrap: |
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| 17 | def __init__(self, fun, check_args, argtypes): |
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| 18 | fun.restype=None |
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| 19 | if check_args: |
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| 20 | fun.argtypes=argtypes |
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| 21 | self.fun=fun |
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| 22 | self.convert=None |
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| 23 | def __call__(self, *args): |
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| 24 | if self.convert is None: |
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| 25 | self.convert=[ py2c[type(arg)] for arg in args] |
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| 26 | args = [ conv(arg) for conv,arg in zip(self.convert,args) ] |
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| 27 | return self.fun(*args) |
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| 28 | |
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| 29 | def typelist(argtypes): |
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| 30 | lst=[] |
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| 31 | for x in argtypes: |
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| 32 | if type(x) is int: |
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| 33 | lst+=(x-1)*[prev] # x-1 because prev has already been appended once |
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| 34 | else: |
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| 35 | lst.append(x) |
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| 36 | prev=x |
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| 37 | return lst |
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| 38 | |
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| 39 | class SharedLib: |
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| 40 | def __init__(self,vardict,name,check_args=True, prefix_so='',prefix_py=''): |
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| 41 | self.vardict, self.check_args = vardict, check_args |
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| 42 | self.prefix_so, self.prefix_py = prefix_so, prefix_py |
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| 43 | self.lib=cdll.LoadLibrary(name) |
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| 44 | self.vars={} |
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| 45 | def import_funs(self,prototypes,prefix=''): |
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| 46 | for proto in prototypes: |
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| 47 | names=[] |
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| 48 | while type(proto[0]) is str: |
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| 49 | names.append(proto.pop(0)) |
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| 50 | if proto[0] is None: |
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| 51 | proto=None |
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| 52 | else: |
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| 53 | proto = typelist(proto) |
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| 54 | for name in names: |
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| 55 | name = prefix+name |
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| 56 | soname = self.prefix_so+name |
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| 57 | print 'wrap.Sharedlib : importing', soname |
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| 58 | self.vardict[self.prefix_py+name] = Wrap(self.lib[soname], self.check_args, proto) |
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| 59 | def addvars(self,*types_and_names): |
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| 60 | for x in types_and_names: |
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| 61 | if type(x) is str: |
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| 62 | self.vars[x]=ctype.in_dll(self.lib, x.lower()) |
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| 63 | else: |
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| 64 | ctype = x |
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| 65 | def getvar(self,name): |
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| 66 | return self.vars[name].value |
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| 67 | def getvars(self,*names): |
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| 68 | return [self.vars[name].value for name in names] |
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| 69 | def setvar(self,name,val): |
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| 70 | self.vars[name].value=val |
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| 71 | def setvars(self,names,vals): |
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| 72 | for name,val in zip(names,vals): |
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| 73 | self.vars[name].value=val |
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