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<html><head><title>Python: module test.tc_keyapi</title>
</head><body bgcolor="#f0f0f8">

<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="heading">
<tr bgcolor="#7799ee">
<td valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial">&nbsp;<br><big><big><strong><a href="test.html"><font color="#ffffff">test</font></a>.tc_keyapi</strong></big></big></font></td
><td align=right valign=bottom
><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href="file:/home/hut/ranger/test/tc_keyapi.py">/home/hut/ranger/test/tc_keyapi.py</a></font></td></tr></table>
    <p><tt>#&nbsp;Copyright&nbsp;(C)&nbsp;2009,&nbsp;2010&nbsp;&nbsp;Roman&nbsp;Zimbelmann&nbsp;&lt;romanz@lavabit.com&gt;<br>
#<br>
#&nbsp;This&nbsp;program&nbsp;is&nbsp;free&nbsp;software:&nbsp;you&nbsp;can&nbsp;redistribute&nbsp;it&nbsp;and/or&nbsp;modify<br>
#&nbsp;it&nbsp;under&nbsp;the&nbsp;terms&nbsp;of&nbsp;the&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License&nbsp;as&nbsp;published&nbsp;by<br>
#&nbsp;the&nbsp;Free&nbsp;Software&nbsp;Foundation,&nbsp;either&nbsp;version&nbsp;3&nbsp;of&nbsp;the&nbsp;License,&nbsp;or<br>
#&nbsp;(at&nbsp;your&nbsp;option)&nbsp;any&nbsp;later&nbsp;version.<br>
#<br>
#&nbsp;This&nbsp;program&nbsp;is&nbsp;distributed&nbsp;in&nbsp;the&nbsp;hope&nbsp;that&nbsp;it&nbsp;will&nbsp;be&nbsp;useful,<br>
#&nbsp;but&nbsp;WITHOUT&nbsp;ANY&nbsp;WARRANTY;&nbsp;without&nbsp;even&nbsp;the&nbsp;implied&nbsp;warranty&nbsp;of<br>
#&nbsp;MERCHANTABILITY&nbsp;or&nbsp;FITNESS&nbsp;FOR&nbsp;A&nbsp;PARTICULAR&nbsp;PURPOSE.&nbsp;&nbsp;See&nbsp;the<br>
#&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License&nbsp;for&nbsp;more&nbsp;details.<br>
#<br>
#&nbsp;You&nbsp;should&nbsp;have&nbsp;received&nbsp;a&nbsp;copy&nbsp;of&nbsp;the&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License<br>
#&nbsp;along&nbsp;with&nbsp;this&nbsp;program.&nbsp;&nbsp;If&nbsp;not,&nbsp;see&nbsp;&lt;<a href="http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>&gt;.</tt></p>
<p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ee77aa">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big></font></td></tr>
    
<tr><td bgcolor="#ee77aa"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%"><dl>
<dt><font face="helvetica, arial"><a href="unittest.html#TestCase">unittest.TestCase</a>(<a href="__builtin__.html#object">__builtin__.object</a>)
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="test.tc_keyapi.html#Test">Test</a>
</font></dt></dl>
</dd>
</dl>
 <p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#000000" face="helvetica, arial"><a name="Test">class <strong>Test</strong></a>(<a href="unittest.html#TestCase">unittest.TestCase</a>)</font></td></tr>
    
<tr><td bgcolor="#ffc8d8"><tt>&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%"><dl><dt>Method resolution order:</dt>
<dd><a href="test.tc_keyapi.html#Test">Test</a></dd>
<dd><a href="unittest.html#TestCase">unittest.TestCase</a></dd>
<dd><a href="__builtin__.html#object">__builtin__.object</a></dd>
</dl>
<hr>
Methods defined here:<br>
<dl><dt><a name="Test-test_wrapper"><strong>test_wrapper</strong></a>(self)</dt></dl>

<hr>
Methods inherited from <a href="unittest.html#TestCase">unittest.TestCase</a>:<br>
<dl><dt><a name="Test-__call__"><strong>__call__</strong></a>(self, *args, **kwds)</dt></dl>

<dl><dt><a name="Test-__eq__"><strong>__eq__</strong></a>(self, other)</dt></dl>

<dl><dt><a name="Test-__hash__"><strong>__hash__</strong></a>(self)</dt></dl>

<dl><dt><a name="Test-__init__"><strong>__init__</strong></a>(self, methodName<font color="#909090">='runTest'</font>)</dt><dd><tt>Create&nbsp;an&nbsp;instance&nbsp;of&nbsp;the&nbsp;class&nbsp;that&nbsp;will&nbsp;use&nbsp;the&nbsp;named&nbsp;test<br>
method&nbsp;when&nbsp;executed.&nbsp;Raises&nbsp;a&nbsp;ValueError&nbsp;if&nbsp;the&nbsp;instance&nbsp;does<br>
not&nbsp;have&nbsp;a&nbsp;method&nbsp;with&nbsp;the&nbsp;specified&nbsp;name.</tt></dd></dl>

<dl><dt><a name="Test-__ne__"><strong>__ne__</strong></a>(self, other)</dt></dl>

<dl><dt><a name="Test-__repr__"><strong>__repr__</strong></a>(self)</dt></dl>

<dl><dt><a name="Test-__str__"><strong>__str__</strong></a>(self)</dt></dl>

<dl><dt><a name="Test-assertAlmostEqual"><strong>assertAlmostEqual</strong></a> = failUnlessAlmostEqual(self, first, second, places<font color="#909090">=7</font>, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;unequal&nbsp;as&nbsp;determined&nbsp;by&nbsp;their<br>
difference&nbsp;rounded&nbsp;to&nbsp;the&nbsp;given&nbsp;number&nbsp;of&nbsp;decimal&nbsp;places<br>
(default&nbsp;7)&nbsp;and&nbsp;comparing&nbsp;to&nbsp;zero.<br>
&nbsp;<br>
Note&nbsp;that&nbsp;decimal&nbsp;places&nbsp;(from&nbsp;zero)&nbsp;are&nbsp;usually&nbsp;not&nbsp;the&nbsp;same<br>
as&nbsp;significant&nbsp;digits&nbsp;(measured&nbsp;from&nbsp;the&nbsp;most&nbsp;signficant&nbsp;digit).</tt></dd></dl>

<dl><dt><a name="Test-assertAlmostEquals"><strong>assertAlmostEquals</strong></a> = failUnlessAlmostEqual(self, first, second, places<font color="#909090">=7</font>, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;unequal&nbsp;as&nbsp;determined&nbsp;by&nbsp;their<br>
difference&nbsp;rounded&nbsp;to&nbsp;the&nbsp;given&nbsp;number&nbsp;of&nbsp;decimal&nbsp;places<br>
(default&nbsp;7)&nbsp;and&nbsp;comparing&nbsp;to&nbsp;zero.<br>
&nbsp;<br>
Note&nbsp;that&nbsp;decimal&nbsp;places&nbsp;(from&nbsp;zero)&nbsp;are&nbsp;usually&nbsp;not&nbsp;the&nbsp;same<br>
as&nbsp;significant&nbsp;digits&nbsp;(measured&nbsp;from&nbsp;the&nbsp;most&nbsp;signficant&nbsp;digit).</tt></dd></dl>

<dl><dt><a name="Test-assertEqual"><strong>assertEqual</strong></a> = failUnlessEqual(self, first, second, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;unequal&nbsp;as&nbsp;determined&nbsp;by&nbsp;the&nbsp;'=='<br>
operator.</tt></dd></dl>

<dl><dt><a name="Test-assertEquals"><strong>assertEquals</strong></a> = failUnlessEqual(self, first, second, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;unequal&nbsp;as&nbsp;determined&nbsp;by&nbsp;the&nbsp;'=='<br>
operator.</tt></dd></dl>

<dl><dt><a name="Test-assertFalse"><strong>assertFalse</strong></a> = failIf(self, expr, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;the&nbsp;test&nbsp;if&nbsp;the&nbsp;expression&nbsp;is&nbsp;true.</tt></dd></dl>

<dl><dt><a name="Test-assertNotAlmostEqual"><strong>assertNotAlmostEqual</strong></a> = failIfAlmostEqual(self, first, second, places<font color="#909090">=7</font>, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;equal&nbsp;as&nbsp;determined&nbsp;by&nbsp;their<br>
difference&nbsp;rounded&nbsp;to&nbsp;the&nbsp;given&nbsp;number&nbsp;of&nbsp;decimal&nbsp;places<br>
(default&nbsp;7)&nbsp;and&nbsp;comparing&nbsp;to&nbsp;zero.<br>
&nbsp;<br>
Note&nbsp;that&nbsp;decimal&nbsp;places&nbsp;(from&nbsp;zero)&nbsp;are&nbsp;usually&nbsp;not&nbsp;the&nbsp;same<br>
as&nbsp;significant&nbsp;digits&nbsp;(measured&nbsp;from&nbsp;the&nbsp;most&nbsp;signficant&nbsp;digit).</tt></dd></dl>

<dl><dt><a name="Test-assertNotAlmostEquals"><strong>assertNotAlmostEquals</strong></a> = failIfAlmostEqual(self, first, second, places<font color="#909090">=7</font>, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;equal&nbsp;as&nbsp;determined&nbsp;by&nbsp;their<br>
difference&nbsp;rounded&nbsp;to&nbsp;the&nbsp;given&nbsp;number&nbsp;of&nbsp;decimal&nbsp;places<br>
(default&nbsp;7)&nbsp;and&nbsp;comparing&nbsp;to&nbsp;zero.<br>
&nbsp;<br>
Note&nbsp;that&nbsp;decimal&nbsp;places&nbsp;(from&nbsp;zero)&nbsp;are&nbsp;usually&nbsp;not&nbsp;the&nbsp;same<br>
as&nbsp;significant&nbsp;digits&nbsp;(measured&nbsp;from&nbsp;the&nbsp;most&nbsp;signficant&nbsp;digit).</tt></dd></dl>

<dl><dt><a name="Test-assertNotEqual"><strong>assertNotEqual</strong></a> = failIfEqual(self, first, second, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;equal&nbsp;as&nbsp;determined&nbsp;by&nbsp;the&nbsp;'=='<br>
operator.</tt></dd></dl>

<dl><dt><a name="Test-assertNotEquals"><strong>assertNotEquals</strong></a> = failIfEqual(self, first, second, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;equal&nbsp;as&nbsp;determined&nbsp;by&nbsp;the&nbsp;'=='<br>
operator.</tt></dd></dl>

<dl><dt><a name="Test-assertRaises"><strong>assertRaises</strong></a> = failUnlessRaises(self, excClass, callableObj, *args, **kwargs)</dt><dd><tt>Fail&nbsp;unless&nbsp;an&nbsp;exception&nbsp;of&nbsp;class&nbsp;excClass&nbsp;is&nbsp;thrown<br>
by&nbsp;callableObj&nbsp;when&nbsp;invoked&nbsp;with&nbsp;arguments&nbsp;args&nbsp;and&nbsp;keyword<br>
arguments&nbsp;kwargs.&nbsp;If&nbsp;a&nbsp;different&nbsp;type&nbsp;of&nbsp;exception&nbsp;is<br>
thrown,&nbsp;it&nbsp;will&nbsp;not&nbsp;be&nbsp;caught,&nbsp;and&nbsp;the&nbsp;test&nbsp;case&nbsp;will&nbsp;be<br>
deemed&nbsp;to&nbsp;have&nbsp;suffered&nbsp;an&nbsp;error,&nbsp;exactly&nbsp;as&nbsp;for&nbsp;an<br>
unexpected&nbsp;exception.</tt></dd></dl>

<dl><dt><a name="Test-assertTrue"><strong>assertTrue</strong></a> = failUnless(self, expr, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;the&nbsp;test&nbsp;unless&nbsp;the&nbsp;expression&nbsp;is&nbsp;true.</tt></dd></dl>

<dl><dt><a name="Test-assert_"><strong>assert_</strong></a> = failUnless(self, expr, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;the&nbsp;test&nbsp;unless&nbsp;the&nbsp;expression&nbsp;is&nbsp;true.</tt></dd></dl>

<dl><dt><a name="Test-countTestCases"><strong>countTestCases</strong></a>(self)</dt></dl>

<dl><dt><a name="Test-debug"><strong>debug</strong></a>(self)</dt><dd><tt>Run&nbsp;the&nbsp;test&nbsp;without&nbsp;collecting&nbsp;errors&nbsp;in&nbsp;a&nbsp;TestResult</tt></dd></dl>

<dl><dt><a name="Test-defaultTestResult"><strong>defaultTestResult</strong></a>(self)</dt></dl>

<dl><dt><a name="Test-fail"><strong>fail</strong></a>(self, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;immediately,&nbsp;with&nbsp;the&nbsp;given&nbsp;message.</tt></dd></dl>

<dl><dt><a name="Test-failIf"><strong>failIf</strong></a>(self, expr, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;the&nbsp;test&nbsp;if&nbsp;the&nbsp;expression&nbsp;is&nbsp;true.</tt></dd></dl>

<dl><dt><a name="Test-failIfAlmostEqual"><strong>failIfAlmostEqual</strong></a>(self, first, second, places<font color="#909090">=7</font>, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;equal&nbsp;as&nbsp;determined&nbsp;by&nbsp;their<br>
difference&nbsp;rounded&nbsp;to&nbsp;the&nbsp;given&nbsp;number&nbsp;of&nbsp;decimal&nbsp;places<br>
(default&nbsp;7)&nbsp;and&nbsp;comparing&nbsp;to&nbsp;zero.<br>
&nbsp;<br>
Note&nbsp;that&nbsp;decimal&nbsp;places&nbsp;(from&nbsp;zero)&nbsp;are&nbsp;usually&nbsp;not&nbsp;the&nbsp;same<br>
as&nbsp;significant&nbsp;digits&nbsp;(measured&nbsp;from&nbsp;the&nbsp;most&nbsp;signficant&nbsp;digit).</tt></dd></dl>

<dl><dt><a name="Test-failIfEqual"><strong>failIfEqual</strong></a>(self, first, second, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;equal&nbsp;as&nbsp;determined&nbsp;by&nbsp;the&nbsp;'=='<br>
operator.</tt></dd></dl>

<dl><dt><a name="Test-failUnless"><strong>failUnless</strong></a>(self, expr, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;the&nbsp;test&nbsp;unless&nbsp;the&nbsp;expression&nbsp;is&nbsp;true.</tt></dd></dl>

<dl><dt><a name="Test-failUnlessAlmostEqual"><strong>failUnlessAlmostEqual</strong></a>(self, first, second, places<font color="#909090">=7</font>, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;unequal&nbsp;as&nbsp;determined&nbsp;by&nbsp;their<br>
difference&nbsp;rounded&nbsp;to&nbsp;the&nbsp;given&nbsp;number&nbsp;of&nbsp;decimal&nbsp;places<br>
(default&nbsp;7)&nbsp;and&nbsp;comparing&nbsp;to&nbsp;zero.<br>
&nbsp;<br>
Note&nbsp;that&nbsp;decimal&nbsp;places&nbsp;(from&nbsp;zero)&nbsp;are&nbsp;usually&nbsp;not&nbsp;the&nbsp;same<br>
as&nbsp;significant&nbsp;digits&nbsp;(measured&nbsp;from&nbsp;the&nbsp;most&nbsp;signficant&nbsp;digit).</tt></dd></dl>

<dl><dt><a name="Test-failUnlessEqual"><strong>failUnlessEqual</strong></a>(self, first, second, msg<font color="#909090">=None</font>)</dt><dd><tt>Fail&nbsp;if&nbsp;the&nbsp;two&nbsp;objects&nbsp;are&nbsp;unequal&nbsp;as&nbsp;determined&nbsp;by&nbsp;the&nbsp;'=='<br>
operator.</tt></dd></dl>

<dl><dt><a name="Test-failUnlessRaises"><strong>failUnlessRaises</strong></a>(self, excClass, callableObj, *args, **kwargs)</dt><dd><tt>Fail&nbsp;unless&nbsp;an&nbsp;exception&nbsp;of&nbsp;class&nbsp;excClass&nbsp;is&nbsp;thrown<br>
by&nbsp;callableObj&nbsp;when&nbsp;invoked&nbsp;with&nbsp;arguments&nbsp;args&nbsp;and&nbsp;keyword<br>
arguments&nbsp;kwargs.&nbsp;If&nbsp;a&nbsp;different&nbsp;type&nbsp;of&nbsp;exception&nbsp;is<br>
thrown,&nbsp;it&nbsp;will&nbsp;not&nbsp;be&nbsp;caught,&nbsp;and&nbsp;the&nbsp;test&nbsp;case&nbsp;will&nbsp;be<br>
deemed&nbsp;to&nbsp;have&nbsp;suffered&nbsp;an&nbsp;error,&nbsp;exactly&nbsp;as&nbsp;for&nbsp;an<br>
unexpected&nbsp;exception.</tt></dd></dl>

<dl><dt><a name="Test-id"><strong>id</strong></a>(self)</dt></dl>

<dl><dt><a name="Test-run"><strong>run</strong></a>(self, result<font color="#909090">=None</font>)</dt></dl>

<dl><dt><a name="Test-setUp"><strong>setUp</strong></a>(self)</dt><dd><tt>Hook&nbsp;method&nbsp;for&nbsp;setting&nbsp;up&nbsp;the&nbsp;test&nbsp;fixture&nbsp;before&nbsp;exercising&nbsp;it.</tt></dd></dl>

<dl><dt><a name="Test-shortDescription"><strong>shortDescription</strong></a>(self)</dt><dd><tt>Returns&nbsp;a&nbsp;one-line&nbsp;description&nbsp;of&nbsp;the&nbsp;test,&nbsp;or&nbsp;None&nbsp;if&nbsp;no<br>
description&nbsp;has&nbsp;been&nbsp;provided.<br>
&nbsp;<br>
The&nbsp;default&nbsp;implementation&nbsp;of&nbsp;this&nbsp;method&nbsp;returns&nbsp;the&nbsp;first&nbsp;line&nbsp;of<br>
the&nbsp;specified&nbsp;test&nbsp;method's&nbsp;docstring.</tt></dd></dl>

<dl><dt><a name="Test-tearDown"><strong>tearDown</strong></a>(self)</dt><dd><tt>Hook&nbsp;method&nbsp;for&nbsp;deconstructing&nbsp;the&nbsp;test&nbsp;fixture&nbsp;after&nbsp;testing&nbsp;it.</tt></dd></dl>

<hr>
Data descriptors inherited from <a href="unittest.html#TestCase">unittest.TestCase</a>:<br>
<dl><dt><strong>__dict__</strong></dt>
<dd><tt>dictionary&nbsp;for&nbsp;instance&nbsp;variables&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<dl><dt><strong>__weakref__</strong></dt>
<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<hr>
Data and other attributes inherited from <a href="unittest.html#TestCase">unittest.TestCase</a>:<br>
<dl><dt><strong>failureException</strong> = &lt;type 'exceptions.AssertionError'&gt;<dd><tt>Assertion&nbsp;failed.</tt></dl>

</td></tr></table></td></tr></table>
</body></html>
800 committer Kartik Agaram <vc@akkartik.com> 2018-11-30 10:54:42 -0800 4801' href='/akkartik/mu/commit/subx/059read-byte.subx?h=main&id=6030d7e2e56d445ca67c6a0e8c9cf33e46bc673c'>6030d7e2 ^
a94b60b5 ^
6ee77ba7 ^
ee9a9237 ^
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# read-byte-buffered: one higher-level abstraction atop 'read'.
#
# There are many situations where 'read' is a lot to manage, and we need
# to abstract some details away. One of them is when we want to read a file
# character by character. In this situation we follow C's FILE data structure,
# which manages the underlying file descriptor together with the buffer it
# reads into. We call our version 'buffered-file'. Should be useful with other
# primitives as well, in later layers.

== data

# The buffered file for standard input. Also illustrates the layout for
# buffered-file.
Stdin:
    # file descriptor or (address stream)
    0/imm32  # standard input
    # current write index
    0/imm32
    # current read index
    0/imm32
    # length
    8/imm32
    # data
    00 00 00 00 00 00 00 00  # 8 bytes

# TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But
# I don't want to type in 1024 bytes here.

== 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

# return next byte value in EAX, with top 3 bytes cleared.
# On reaching end of file, return 0xffffffff (Eof).
read-byte-buffered:  # f : (address buffered-file) -> byte-or-Eof/EAX
    # . prolog
    55/push-EBP
    89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
    # . save registers
    51/push-ECX
    56/push-ESI
    # 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
    # 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  $read-byte-buffered: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 (EAX == 0) return 0xffffffff
    3d/compare-EAX-and  0/imm32
    75/jump-if-not-equal  $read-byte-buffered:from-stream/disp8
    b8/copy-to-EAX  0xffffffff/imm32/Eof
    eb/jump  $read-byte-buffered:end/disp8
$read-byte-buffered:from-stream:
    # read byte 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
    # ++f->read
    ff          0/subop/increment   1/mod/*+disp8   6/rm32/ESI    .           .             .           .           8/disp8         .                 # increment *(ESI+8)
$read-byte-buffered:end:
    # . restore registers
    5e/pop-to-ESI
    59/pop-to-ECX
    # . epilog
    89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
    5d/pop-to-EBP
    c3/return

# - tests

test-read-byte-buffered-single:
    # - check that read-byte-buffered returns first byte of 'file'
    # 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+4)
    # . . push args
    b8/copy-to-EAX  _test-buffered-file/imm32
    05/add-to-EAX  4/imm32
    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
    # . write(_test-stream, "Ab")
    # . . push args
    68/push  "Ab"/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-byte-buffered(_test-buffered-file)
    # . . push args
    68/push  _test-buffered-file/imm32
    # . . call
    e8/call  read-byte-buffered/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 'A', msg)
    # . . push args
    68/push  "F - test-read-byte-buffered-single"/imm32
    68/push  0x41/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . end
    c3/return

test-read-byte-buffered-multiple:
    # - call read-byte-buffered twice, check that second call returns second byte
    # 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+4)
    # . . push args
    b8/copy-to-EAX  _test-buffered-file/imm32
    05/add-to-EAX  4/imm32
    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
    # . write(_test-stream, "Ab")
    # . . push args
    68/push  "Ab"/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-byte-buffered(_test-buffered-file)
    # . . push args
    68/push  _test-buffered-file/imm32
    # . . call
    e8/call  read-byte-buffered/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # read-byte-buffered(_test-buffered-file)
    # . . push args
    68/push  _test-buffered-file/imm32
    # . . call
    e8/call  read-byte-buffered/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 'b', msg)
    # . . push args
    68/push  "F - test-read-byte-buffered-multiple"/imm32
    68/push  0x62/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . end
    c3/return

test-read-byte-buffered-end-of-file:
    # - call read-byte-buffered on an empty 'file', check that it returns Eof
    # 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+4)
    # . . push args
    b8/copy-to-EAX  _test-buffered-file/imm32
    05/add-to-EAX  4/imm32
    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
    # read-byte-buffered(_test-buffered-file)
    # . . push args
    68/push  _test-buffered-file/imm32
    # . . call
    e8/call  read-byte-buffered/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 0xffffffff, msg)
    # . . push args
    68/push  "F - test-read-byte-buffered-end-of-file"/imm32
    68/push  0xffffffff/imm32/Eof
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . end
    c3/return

test-read-byte-buffered-refills-buffer:
    # - consume buffered-file's buffer, check that next read-byte-buffered still works
    # 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+4)
    # . . push args
    b8/copy-to-EAX  _test-buffered-file/imm32
    05/add-to-EAX  4/imm32
    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
    # . write(_test-stream, "Abcdefgh")
    # . . push args
    68/push  "Abcdefgh"/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
    # pretend buffer is full
    # . _test-buffered-file->read = 6  # >= _test-buffered-file->length
    b8/copy-to-EAX  _test-buffered-file/imm32
    c7          0/subop/copy        1/mod/*+disp8   0/rm32/EAX    .           .             .           .           8/disp8         6/imm32           # copy to *(EAX+8)
    # read-byte-buffered(_test-buffered-file)
    # . . push args
    68/push  _test-buffered-file/imm32
    # . . call
    e8/call  read-byte-buffered/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add to ESP
    # check-ints-equal(EAX, 'A', msg)
    # . . push args
    68/push  "F - test-read-byte-buffered-refills-buffer"/imm32
    68/push  0x41/imm32
    50/push-EAX
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               0xc/imm32         # add to ESP
    # . end
    c3/return

== data

# a test buffered file for _test-stream
_test-buffered-file:
    # file descriptor or (address stream)
    _test-stream/imm32
    # current write index
    0/imm32
    # current read index
    0/imm32
    # length
    6/imm32
    # data
    00 00 00 00 00 00  # 6 bytes

# . . vim:nowrap:textwidth=0