endianness - c++ missing endianconvert method -


i have partial source code i'm trying reconstruct (don't ask rest is, not available) , i'm stuck @ missing method 'endianconvert'

i don't have experience c++ i'm hoping here can me out. heres function call

endianconvert (reinterpret_cast<dword *>(pdata+dwclassoffset), sizeof (pagetable) >> 2);

pdata byte array filled contents of file

byte * pdata = new byte[l];

dwclassoffset current location in file

dword dwclassoffset = 0;

and pagetable class containing several dword variables.

it looks need swap endianess of several dwords in byte array don't know how start implementing this, appreciated.

the >> 2 expression divides size of object in bytes 4, gives number of 4-byte words convert, start function something many times:

void endianconvert(dword* data, size_t count) {     (size_t n = 0; n < count; ++n)        /* convert data[n] */; }

now need able swap endianness of single dword, quite simple:

dword& d = data[n]; dword b1 = d & 0x000000ff; dword b2 = d & 0x0000ff00; dword b3 = d & 0x00ff0000; dword b4 = d & 0xff000000; d = (b1 << 24) | (b2 << 8) | (b3 >> 8) | (b4 >> 24);

extract each byte, shift position have in other endianness, , or bytes together.


Comments

Post a Comment

Popular posts from this blog

SPSS keyboard combination alters encoding -

my question not have programming practical issue on spss. accident keyword combination cannot remember because did not intend press changed encoding in spss , text in data in different language english shown small boxes. nevertheless, when kind of analysis performed different language text shown in output. does know reason? tried change encoding did not produce result. first, @ edit > options , see whether setting unicode or locale. might fix it. if have text in multiple languages, want unicode. otherwise, may have specific locale set wrong. can change set locale, need know locale want use.
Read more

Add new record to the table by click on the button in Microsoft Access -

in ms access form want implement separate button, adds new record table. in order added button , attached button event: private sub btnaddrec_click() refresh codecontextobject on error resume next docmd.gotorecord , , acnewrec if err.number <> 0 btnaddrec.enabled = false end if end end sub everything ok when open window , click btnaddrec button, problem when first of perform navigation through existed records , after click on button. got runtime error: 2105: «you can't go specified record. may @ end of recordset» . how solve issue, need have ability add new record on click on specific button, no matter, have walked or not walked through records before. thanks. i created simple form field call description (and autonumber) , created button code follows click event. filled number of records , navigated through them, clicked addnewrec button. form navigated new record without issues. able click addnewrec button directly after
Read more

CSS3 Transition to highlight new elements created in JQuery -

i want use css3 color transition apply highlight-fading color effect (yellow transparent) new elements appended markup using jquery. css #content div { background-color:transparent; -moz-transition:background-color 2s; -webkit-transition:background-color 2s; -o-transition:background-color 2s; transition:background-color 2s; } #content div.new { background-color:yellow; } html <div id="content"></div> <a id="add-element" href="#">add new element</a> js $('#add-element').click(function() { var newelement = $('<div class="new">new element</div>'); $('#content').append(newelement); newelement.removeclass('new'); }); when click link, new element created. class "new" (background color yellow) , it's appended html markup. should able remove "new" class trigger background color transition transparent (or whate
Read more