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author | Gabriele M <moto.falcon.git@gmail.com> | 2018-03-24 09:11:21 +0100 |
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committer | Gabriele M <moto.falcon.git@gmail.com> | 2018-03-24 17:45:00 +0100 |
commit | 8ad65076b68f4f96a81810195d347b49149d9c20 (patch) | |
tree | c196e949a1881516f4055cf515b9b24a6a4da5de /update_payload/format_utils.py | |
download | scripts-8ad65076b68f4f96a81810195d347b49149d9c20.tar.gz scripts-8ad65076b68f4f96a81810195d347b49149d9c20.tar.bz2 scripts-8ad65076b68f4f96a81810195d347b49149d9c20.zip |
Import update_payload library code
From https://android.googlesource.com/platform/system/update_engine
at ee67a8d57519112f62f439a8644ea497ab6898c2.
Diffstat (limited to 'update_payload/format_utils.py')
-rw-r--r-- | update_payload/format_utils.py | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/update_payload/format_utils.py b/update_payload/format_utils.py new file mode 100644 index 0000000..6248ba9 --- /dev/null +++ b/update_payload/format_utils.py @@ -0,0 +1,109 @@ +# +# Copyright (C) 2013 The Android Open Source Project +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +"""Various formatting functions.""" + + +def NumToPercent(num, total, min_precision=1, max_precision=5): + """Returns the percentage (string) of |num| out of |total|. + + If the percentage includes a fraction, it will be computed down to the least + precision that yields a non-zero and ranging between |min_precision| and + |max_precision|. Values are always rounded down. All arithmetic operations + are integer built-ins. Examples (using default precision): + + (1, 1) => 100% + (3, 10) => 30% + (3, 9) => 33.3% + (3, 900) => 0.3% + (3, 9000000) => 0.00003% + (3, 900000000) => 0% + (5, 2) => 250% + + Args: + num: the value of the part + total: the value of the whole + min_precision: minimum precision for fractional percentage + max_precision: maximum precision for fractional percentage + Returns: + Percentage string, or None if percent cannot be computed (i.e. total is + zero). + + """ + if total == 0: + return None + + percent = 0 + precision = min(min_precision, max_precision) + factor = 10 ** precision + while precision <= max_precision: + percent = num * 100 * factor / total + if percent: + break + factor *= 10 + precision += 1 + + whole, frac = divmod(percent, factor) + while frac and not frac % 10: + frac /= 10 + precision -= 1 + + return '%d%s%%' % (whole, '.%0*d' % (precision, frac) if frac else '') + + +def BytesToHumanReadable(size, precision=1, decimal=False): + """Returns a human readable representation of a given |size|. + + The returned string includes unit notations in either binary (KiB, MiB, etc) + or decimal (kB, MB, etc), based on the value of |decimal|. The chosen unit is + the largest that yields a whole (or mixed) number. It may contain up to + |precision| fractional digits. Values are always rounded down. Largest unit + is an exabyte. All arithmetic operations are integer built-ins. Examples + (using default precision and binary units): + + 4096 => 4 KiB + 5000 => 4.8 KiB + 500000 => 488.2 KiB + 5000000 => 4.7 MiB + + Args: + size: the size in bytes + precision: the number of digits past the decimal point + decimal: whether to compute/present decimal or binary units + Returns: + Readable size string, or None if no conversion is applicable (i.e. size is + less than the smallest unit). + + """ + constants = ( + (('KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB'), 1024), + (('kB', 'MB', 'GB', 'TB', 'PB', 'EB'), 1000) + ) + suffixes, base = constants[decimal] + exp, magnitude = 0, 1 + while exp < len(suffixes): + next_magnitude = magnitude * base + if size < next_magnitude: + break + exp += 1 + magnitude = next_magnitude + + if exp != 0: + whole = size / magnitude + frac = (size % magnitude) * (10 ** precision) / magnitude + while frac and not frac % 10: + frac /= 10 + return '%d%s %s' % (whole, '.%d' % frac if frac else '', suffixes[exp - 1]) |