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33352536 pre { line-height: 125%; }
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# Copyright (C) 2009, 2010  Roman Zimbelmann <romanz@lavabit.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

if __name__ == '__main__': from __init__ import init; init()

import unittest
import os
from os.path import realpath, join, dirname

from test import Fake
from ranger.shared import FileManagerAware, SettingsAware
from ranger.core.loader import Loader
from ranger.fsobject import Directory, File
from ranger.ext.openstruct import OpenStruct

TESTDIR = realpath(join(dirname(__file__), 'testdir'))
#TESTDIR = "/usr/sbin"

class Test1(unittest.TestCase):
	def test_loader(self):
		loader = Loader()
		fm = OpenStruct(loader=loader)
		SettingsAware.settings = Fake()
		FileManagerAware.fm = fm

		# initially, the loader has nothing to do
		self.assertFalse(loader.has_work())

		dir = Directory(TESTDIR)
		self.assertEqual(None, dir.files)
		self.assertFalse(loader.has_work())

		# Calling load_content() will enqueue the loading operation.
		# dir is not loaded yet, but the loader has work
		dir.load_content(schedule=True)
		self.assertEqual(None, dir.files)
		self.assertTrue(loader.has_work())

		iterations = 0
		while loader.has_work():
			iterations += 1
			loader.work()
		#print(iterations)
		self.assertNotEqual(None, dir.files)
		self.assertFalse(loader.has_work())
#
#	def test_get_overhead_of_loader(self):
#		N = 5
#		tloader = benchmark_load(N)
#		traw = benchmark_raw_load(N)
#		#traw1k = 250.0
#		#traw = traw1k * N / 1000.0
#		#print("Loader: {0}s".format(tloader))
#		#print("Raw:    {0}s".format(traw))
#		self.assertTrue(tloader > traw)
#		overhead = tloader * 100 / traw - 100
#		self.assertTrue(overhead < 2, "overhead of loader too high: {0}" \
#				.format(overhead))
#		#print("Overhead: {0:.5}%".format(overhead))


if __name__ == '__main__':
	unittest.main()
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
== code
#   instruction                     effective address                                                   register    displacement    immediate
# . op          subop               mod             rm32          base        index         scale       r32
# . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes

# read all bytes from 'f' and store them into 's'
# abort if 's' is too small
slurp:  # f : (address buffered-file), s : (address stream byte)
    # pseudocode:
    #   while true
    #     if (s->write >= s->length) abort
    #     if (f->read >= f->write) populate stream from file
    #     if (f->write == 0) break
    #     AL = f->data[f->read]
    #     s->data[s->write] = AL
    #     ++f->read
    #     ++s->write
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    50/push-eax
    51/push-ecx
    52/push-edx
    56/push-esi
    57/push-edi
    # esi = f
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   8/disp8         .                 # copy *(ebp+8) to esi
    # ecx = f->read
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           1/r32/ecx   8/disp8         .                 # copy *(esi+8) to ecx
    # edi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   0xc/disp8       .                 # copy *(ebp+12) to edi
    # edx = s->write
    8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           2/r32/edx   .               .                 # copy *edi to edx
$slurp:loop:
    # if (s->write >= s->length) abort
    3b/compare                      1/mod/*+disp8   7/rm32/edi    .           .             .           2/r32/edx   8/disp8         .                 # compare edx with *(edi+8)
    7d/jump-if-greater-or-equal  $slurp:abort/disp8
    # if (f->read >= f->write) populate stream from file
    3b/compare                      1/mod/*+disp8   6/rm32/esi    .           .             .           1/r32/ecx   4/disp8         .                 # compare ecx with *(esi+4)
    7c/jump-if-lesser  $slurp:from-stream/disp8
    # . clear-stream(stream = f+4)
    # . . push args
    8d/copy-address                 1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # copy esi+4 to eax
    50/push-eax
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . f->read must now be 0; update its cache at ecx
    31/xor                          3/mod/direct    1/rm32/ecx    .           .             .           1/r32/ecx   .               .                 # clear ecx
    # . eax = read(f->fd, stream = f+4)
    # . . push args
    50/push-eax
    ff          6/subop/push        0/mod/indirect  6/rm32/esi    .           .             .           .           .               .                 # push *esi
    # . . call
    e8/call  read/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # if (f->write == 0) break
    # since f->read was initially 0, eax is the same as f->write
    # . if (eax == 0) return true
    3d/compare-eax-and  0/imm32
    74/jump-if-equal  $slurp:end/disp8
$slurp:from-stream:
    # AL = f->data[f->read]
    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
    8a/copy-byte                    1/mod/*+disp8   4/rm32/sib    6/base/esi  1/index/ecx   .           0/r32/AL    0x10/disp8      .                 # copy byte at *(esi+ecx+16) to AL
    # s->data[s->write] = AL
    88/copy-byte                    1/mod/*+disp8   4/rm32/sib    7/base/edi  2/index/edx   .           0/r32/AL    0xc/disp8       .                 # copy AL to *(edi+edx+12)
    # ++f->read
    41/increment-ecx
    # ++s->write
    42/increment-edx
    eb/jump  $slurp:loop/disp8
$slurp:end:
    # save f->read
    89/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           1/r32/ecx   8/disp8         .                 # copy ecx to *(esi+8)
    # save s->write
    89/copy                         0/mod/indirect  7/rm32/edi    .           .             .           2/r32/edx   .               .                 # copy edx to *edi
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    5a/pop-to-edx
    59/pop-to-ecx
    58/pop-to-eax
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

$slurp:abort:
    # . _write(2/stderr, error)
    # . . push args
    68/push  "slurp: destination too small\n"/imm32
    68/push  2/imm32/stderr
    # . . call
    e8/call  _write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . syscall(exit, 1)
    bb/copy-to-ebx  1/imm32
    b8/copy-to-eax  1/imm32/exit
    cd/syscall  0x80/imm8
    # never gets here

test-slurp:
    # setup
    # . clear-stream(_test-stream)
    # . . push args
    68/push  _test-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . clear-stream(_test-buffered-file->buffer)
    # . . push args
    68/push  _test-buffered-file->buffer/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . clear-stream(_test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # write(_test-stream, "ab\ncd")
    # . . push args
    68/push  "ab\ncd"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # read a line from _test-stream (buffered by _test-buffered-file) into _test-tmp-stream
    # . eax = slurp(_test-buffered-file, _test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    68/push  _test-buffered-file/imm32
    # . . call
    e8/call  slurp/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-stream-equal(_test-tmp-stream, "ab\ncd", msg)
    # . . push args
    68/push  "F - test-slurp"/imm32
    68/push  "ab\ncd"/imm32
    68/push  _test-tmp-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # end
    c3/return

# . . vim:nowrap:textwidth=0