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Linux反编译全攻略 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...x cm2
cm2: file format elf32-i386
cm2
architecture: i386, flags 0x00000102:
EXEC_P, D_PAGED
start address 0x08048080
程序头：
LOAD off 0x00000000 vaddr 0x08048000 paddr 0x08048000 align 2**12
filesz 0x000005b8 memsz 0x000005b8 flags r-x
LOAD off 0x000005b8...
SEH stack 结构探索（1）--- 从 SEH 链的最底层（线程第1个SEH结构）说起 -...
...在线程启动例程找到答案：ntdll32!_RtlUserThreadStart()里。0:000:x86> uf ntdll32!_Rt...线程的第 1 个 SEH 结构是什么时候构建的，我在线程启动例程找到答案：ntdll32!_RtlUserThreadStart() 里。
0:000:x86> uf ntdll32!_RtlUserThreadStart
ntdll32!_RtlU...
How can I convert byte size into a human-readable format in Java?
...matting byte size to human readable format | Programming.Guide
SI (1 k = 1,000)
public static String humanReadableByteCountSI(long bytes) {
if (-1000 < bytes && bytes < 1000) {
return bytes + " B";
}
CharacterIterator ci = new StringCharacterIterator("kMGTPE");
...
Can I query MongoDB ObjectId by date?
...hex seconds since Unix epoch */
var hexSeconds = Math.floor(timestamp/1000).toString(16);
/* Create an ObjectId with that hex timestamp */
var constructedObjectId = ObjectId(hexSeconds + "0000000000000000");
return constructedObjectId
}
/* Find all documents created after midnigh...
How to decode Unicode escape sequences like “\u00ed” to proper UTF-8 encoded characters?
...cape_sequence_decode($str) {
// [U+D800 - U+DBFF][U+DC00 - U+DFFF]|[U+0000 - U+FFFF]
$regex = '/\\\u([dD][89abAB][\da-fA-F]{2})\\\u([dD][c-fC-F][\da-fA-F]{2})
|\\\u([\da-fA-F]{4})/sx';
return preg_replace_callback($regex, function($matches) {
if (isset($matches[3...
Why is printing to stdout so slow? Can it be sped up?
...writing test on my machine, and with buffering, it also 0.05s here for 100,000 lines.
However, with the above modifications to write unbuffered, it takes 40 seconds to write only 1,000 lines to disk. I gave up waiting for 100,000 lines to write, but extrapolating from the previous, it would take ov...
What does multicore assembly language look like?
...s:
MOV ESI, ICR_LOW ; Load address of ICR low dword into ESI.
MOV EAX, 000C4500H ; Load ICR encoding for broadcast INIT IPI
; to all APs into EAX.
MOV [ESI], EAX ; Broadcast INIT IPI to all APs
; 10-millisecond delay loop.
MOV EAX, 000C46XXH ; Load ICR encoding for bro...
How to read data when some numbers contain commas as thousand separator?
...hen convert the string to numeric using as.numeric:
y <- c("1,200","20,000","100","12,111")
as.numeric(gsub(",", "", y))
# [1] 1200 20000 100 12111
This was also answered previously on R-Help (and in Q2 here).
Alternatively, you can pre-process the file, for instance with sed in unix.
...
HashSet versus Dictionary w.r.t searching time to find if an item exists
...
HashSet vs List vs Dictionary performance test, taken from here.
Add 1000000 objects (without checking duplicates)
Contains check for half the objects of a collection of 10000
Remove half the objects of a collection of 10000
...
PHP array: count or sizeof?
...$i<count($x); $i++) { //or $i<sizeOf($x);
//...
}
A loop with 1000 keys with 1 byte values are given.
+---------+----------+
| count() | sizeof() |
+-----------------+---------+----------+
| With precalc | 152 | 212 |
| Without precalc | ...