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iobuf.py
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iobuf.py
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# ----------------------------------------------------------------------------
"""
Input/Output Buffer Objects
Stateful objects used to produce/consume data from JTAG devices
"""
# ----------------------------------------------------------------------------
import sys
import string
import struct
import hashlib
import time
import util
# ----------------------------------------------------------------------------
printable = string.letters + string.digits + string.punctuation + ' '
#-----------------------------------------------------------------------------
class write_file(object):
def __init__(self, ui, msg, name, size, mode = 'le'):
self.ui = ui
self.f = open(name, 'wb')
self.n = 0
self.fmt16 = ('>H', '<H')[mode == 'le']
self.fmt32 = ('>L', '<L')[mode == 'le']
# display output
self.ui.put('%s ' % msg)
self.progress = util.progress(ui, 8, size)
def close(self):
self.f.close()
self.progress.erase()
self.ui.put('done\n')
def wr32(self, val):
self.f.write(struct.pack(self.fmt32, val))
self.n += 4
self.progress.update(self.n)
def wr16(self, val):
self.f.write(struct.pack(self.fmt16, val))
self.n += 2
self.progress.update(self.n)
def wr8(self, val):
self.f.write(struct.pack('B', val))
self.n += 1
self.progress.update(self.n)
#-----------------------------------------------------------------------------
class read_file(object):
def __init__(self, ui, msg, name, size, mode = 'le'):
self.ui = ui
self.f = open(name, 'rb')
self.n = 0
self.fmt16 = ('>H', '<H')[mode == 'le']
self.fmt32 = ('>L', '<L')[mode == 'le']
# display output
self.t_start = time.time()
self.ui.put('%s ' % msg)
self.progress = util.progress(ui, 8, size)
def close(self, rate = False):
t_end = time.time()
self.f.close()
self.progress.erase()
if rate:
s = '%.2f KiB/sec' % (float(self.n)/((t_end - self.t_start) * 1024.0))
self.ui.put('done (%s)\n' % s)
else:
self.ui.put('done\n')
def rd32(self):
val = self.f.read(4)
n = len(val)
if n != 4:
val = ''.join([val, '\xff' * (4 - n)])
self.n += 4
self.progress.update(self.n)
return struct.unpack(self.fmt32, val)[0]
def rd16(self):
val = self.f.read(2)
n = len(val)
if n != 2:
val = ''.join([val, '\xff' * (2 - n)])
self.n += 2
self.progress.update(self.n)
return struct.unpack(self.fmt16, val)[0]
def rd8(self):
val = self.f.read(1)
n = len(val)
if n == 0:
val = '\xff'
self.n += 1
self.progress.update(self.n)
return struct.unpack('B', val)[0]
#-----------------------------------------------------------------------------
class verify_file(object):
def __init__(self, ui, msg, name, size, mode = 'le'):
self.ui = ui
self.f = open(name, 'rb')
self.n = 0
self.diff = []
self.fmt16 = ('>H', '<H')[mode == 'le']
self.fmt32 = ('>L', '<L')[mode == 'le']
# display output
self.ui.put('%s ' % msg)
self.progress = util.progress(ui, 8, size)
def close(self):
self.f.close()
self.progress.erase()
if len(self.diff) == 0:
self.ui.put('same\n')
else:
self.ui.put('%d differences\n' % len(self.diff))
def file_rd32(self):
val = self.f.read(4)
n = len(val)
if n != 4:
val = ''.join([val, '\xff' * (4 - n)])
return struct.unpack(self.fmt32, val)[0]
def wr32(self, val):
x = self.file_rd32()
if val != x:
self.diff.append((self.n, val, x))
self.n += 4
self.progress.update(self.n)
#-----------------------------------------------------------------------------
class data_buffer(object):
def __init__(self, width, data = None):
self.width = width
self.buf = []
if data:
mask = util.mask(self.width)
self.buf = [x & mask for x in data]
self.wr_idx = len(self.buf)
self.rd_idx = 0
def copy(self):
"""return a copy of this buffer"""
return data_buffer(self.width, self.buf)
def read(self):
"""read from the data buffer"""
val = self.buf[self.rd_idx]
self.rd_idx += 1
return val
def write(self, val):
"""write to the data buffer"""
val = util.mask_val(val, self.width)
if self.wr_idx == len(self.buf):
# append to the buffer
self.buf.append(val)
self.wr_idx += 1
elif self.wr_idx < len(self.buf):
# replace existing content
self.buf[self.wr_idx] = val
else:
assert False, 'buffer write error: more than 1 off the end'
def rd32(self):
assert self.width == 32
return self.read()
def rd16(self):
assert self.width == 16
return self.read()
def rd8(self):
assert self.width == 8
return self.read()
def wr32(self, val):
assert self.width == 32
self.write(val)
def wr16(self, val):
assert self.width == 16
self.write(val)
def wr8(self, val):
assert self.width == 8
self.write(val)
def convert8(self, mode):
"""convert the buffer to 8 bit values"""
if self.width == 32:
new_buf = []
for x in self.buf:
if mode == 'be':
# big endian conversion
new_buf.append((x >> 24) & 255)
new_buf.append((x >> 16) & 255)
new_buf.append((x >> 8) & 255)
new_buf.append(x & 255)
else:
# little endian conversion
new_buf.append(x & 255)
new_buf.append((x >> 8) & 255)
new_buf.append((x >> 16) & 255)
new_buf.append((x >> 24) & 255)
self.buf = new_buf
elif self.width == 16:
new_buf = []
for x in self.buf:
if mode == 'be':
# big endian conversion
new_buf.append((x >> 8) & 255)
new_buf.append(x & 255)
else:
# little endian conversion
new_buf.append(x & 255)
new_buf.append((x >> 8) & 255)
self.buf = new_buf
elif self.width == 8:
# nothing to do
return
else:
assert False, 'conversion error: width %d' % self.width
# reset the buffer indices
self.wr_idx = len(self.buf)
self.rd_idx = 0
self.width = 8
def convert16(self, mode):
"""convert the buffer to 16 bit values"""
if self.width == 32:
new_buf = []
for x in self.buf:
if mode == 'be':
# big endian conversion
new_buf.append((x >> 16) & 0xffff)
new_buf.append(x & 0xffff)
else:
# little endian conversion
new_buf.append(x & 0xffff)
new_buf.append((x >> 16) & 0xffff)
self.buf = new_buf
elif self.width == 16:
# nothing to do
return
elif self.width == 8:
# round up to a multiple of 2 bytes
n = len(self.buf) & 1
self.buf.extend((0,) * n)
new_buf = []
for i in range(0, len(self.buf), 2):
if mode == 'be':
# big endian conversion
val = (self.buf[i] << 8) | self.buf[i+1]
else:
# little endian conversion
val = self.buf[i] | (self.buf[i+1] << 8)
new_buf.append(val)
self.buf = new_buf
else:
assert False, 'conversion error: width %d' % self.width
# reset the buffer indices
self.wr_idx = len(self.buf)
self.rd_idx = 0
self.width = 16
def convert32(self, mode):
"""convert the buffer to 32 bit values"""
if self.width == 32:
# nothing to do
return
elif self.width == 16:
assert False, 'TODO: unsupported conversion from 16 to 32 bits'
elif self.width == 8:
# round up to a multiple of 4 bytes
n = (4 - (len(self.buf) & 3)) & 3
self.buf.extend((0,) * n)
new_buf = []
for i in range(0, len(self.buf), 4):
if mode == 'be':
# big endian conversion
val = ((self.buf[i] << 24) |
(self.buf[i+1] << 16) |
(self.buf[i+2] << 8) |
(self.buf[i+3]))
else:
# little endian conversion
val = (self.buf[i] |
(self.buf[i+1] << 8) |
(self.buf[i+2] << 16) |
(self.buf[i+3] << 24))
new_buf.append(val)
self.buf = new_buf
else:
assert False, 'conversion error: width %d' % self.width
# reset the buffer indices
self.wr_idx = len(self.buf)
self.rd_idx = 0
self.width = 32
def convert(self, width, mode):
if width == 8:
self.convert8(mode)
elif width == 16:
self.convert16(mode)
elif width == 32:
self.convert32(mode)
else:
assert False, 'bad width'
def endian_swap(self):
"""swap the endian-ness of all values"""
if self.width == 32:
self.buf = [util.swap32(x) for x in self.buf]
elif self.width == 16:
self.buf = [util.swap16(x) for x in self.buf]
elif self.width == 8:
# nothing to do
return
else:
assert False, 'endian swap error: width %d' % self.width
def compare(self, x):
"""compare io buffers: return True if they are the same"""
if self.width != x.width:
return False
if len(self.buf) != len(x.buf):
return False
for i in xrange(len(self.buf)):
if self.buf[i] != x.buf[i]:
return False
return True
def md5(self, mode):
"""return an md5 hash of the buffer"""
x = self.copy()
x.convert8(mode)
m = hashlib.md5()
m.update(''.join([chr(b) for b in x.buf]))
return m.hexdigest()
def ascii_str(self):
"""return an ascii string representing an 8-bit buffer"""
assert self.width == 8, 'width must be 8 bits'
return ''.join([('.', chr(b))[chr(b) in printable] for b in self.buf])
def to_str(self):
"""convert an 8-bit buffer to a string"""
assert self.width == 8, 'width must be 8 bits'
return ''.join([chr(b) for b in self.buf])
def __len__(self):
return len(self.buf)
def __str__(self):
"""return a string for the buffer values"""
fmt = '%%0%dx' % (self.width / 4)
return ' '.join([fmt % x for x in self.buf])
#-----------------------------------------------------------------------------