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114 lines
3.4 KiB
Python
114 lines
3.4 KiB
Python
# Copyright 2013-2015. The Regents of the University of California.
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# Copyright 2021. Uecker Lab. University Center Göttingen.
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# All rights reserved. Use of this source code is governed by
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# a BSD-style license which can be found in the LICENSE file.
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#
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# Authors:
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# 2013 Martin Uecker <uecker@eecs.berkeley.edu>
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# 2015 Jonathan Tamir <jtamir@eecs.berkeley.edu>
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from __future__ import print_function
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from __future__ import with_statement
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import numpy as np
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import mmap
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import os
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def readcfl(name):
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# get dims from .hdr
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with open(name + ".hdr", "rt") as h:
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h.readline() # skip
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l = h.readline()
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dims = [int(i) for i in l.split()]
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# remove singleton dimensions from the end
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n = np.prod(dims)
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dims_prod = np.cumprod(dims)
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dims = dims[:np.searchsorted(dims_prod, n)+1]
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# load data and reshape into dims
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with open(name + ".cfl", "rb") as d:
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a = np.fromfile(d, dtype=np.complex64, count=n);
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return a.reshape(dims, order='F') # column-major
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def readmulticfl(name):
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# get dims from .hdr
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with open(name + ".hdr", "rt") as h:
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lines = h.read().splitlines()
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index_dim = 1 + lines.index('# Dimensions')
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total_size = int(lines[index_dim])
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index_sizes = 1 + lines.index('# SizesDimensions')
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sizes = [int(i) for i in lines[index_sizes].split()]
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index_dims = 1 + lines.index('# MultiDimensions')
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with open(name + ".cfl", "rb") as d:
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a = np.fromfile(d, dtype=np.complex64, count=total_size)
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offset = 0
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result = []
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for i in range(len(sizes)):
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dims = ([int(i) for i in lines[index_dims + i].split()])
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n = np.prod(dims)
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result.append(a[offset:offset+n].reshape(dims, order='F'))
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offset += n
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if total_size != offset:
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print("Error")
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return result
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def writecfl(name, array):
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with open(name + ".hdr", "wt") as h:
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h.write('# Dimensions\n')
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for i in (array.shape):
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h.write("%d " % i)
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h.write('\n')
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size = np.prod(array.shape) * np.dtype(np.complex64).itemsize
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with open(name + ".cfl", "a+b") as d:
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os.ftruncate(d.fileno(), size)
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mm = mmap.mmap(d.fileno(), size, flags=mmap.MAP_SHARED, prot=mmap.PROT_WRITE)
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if array.dtype != np.complex64:
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array = array.astype(np.complex64)
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mm.write(np.ascontiguousarray(array.T))
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mm.close()
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#with mmap.mmap(d.fileno(), size, flags=mmap.MAP_SHARED, prot=mmap.PROT_WRITE) as mm:
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# mm.write(array.astype(np.complex64).tobytes(order='F'))
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def writemulticfl(name, arrays):
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size = 0
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dims = []
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for array in arrays:
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size += array.size
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dims.append(array.shape)
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with open(name + ".hdr", "wt") as h:
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h.write('# Dimensions\n')
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h.write("%d\n" % size)
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h.write('# SizesDimensions\n')
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for dim in dims:
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h.write("%d " % len(dim))
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h.write('\n')
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h.write('# MultiDimensions\n')
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for dim in dims:
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for i in dim:
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h.write("%d " % i)
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h.write('\n')
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size = size * np.dtype(np.complex64).itemsize
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with open(name + ".cfl", "a+b") as d:
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os.ftruncate(d.fileno(), size)
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mm = mmap.mmap(d.fileno(), size, flags=mmap.MAP_SHARED, prot=mmap.PROT_WRITE)
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for array in arrays:
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if array.dtype != np.complex64:
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array = array.astype(np.complex64)
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mm.write(np.ascontiguousarray(array.T))
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mm.close()
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