Noitidart/ctypes notes.md

## ctypes notes.md

      
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              ctypes notes.md
            
          
https://github.com/voikko/mozvoikko/blob/4ce50391bdefe791318f1f0c31a3bc89e978b513/components/MozVoikko2.js#L52


var runtime = Components.classes["@mozilla.org/xre/app-info;1"]
.getService(Components.interfaces.nsIXULRuntime);
var abi = runtime.OS + "_" + runtime.XPCOMABI;
var lib_name;
this.data_loc = "";
//==================================================================
// Detect shared library name to load
//==================================================================
if (abi == "Linux_x86-gcc3" || abi == "Linux_x86_64-gcc3") {
lib_name = "libvoikko.so.1";
} else if (abi == "WINNT_x86-msvc" || abi == "WINNT_x86_64-msvc") {
lib_name = "libvoikko-1.dll";
this.call_abi = ctypes.winapi_abi;
} else if (abi == "Darwin_x86_64-gcc3" || abi == "Darwin_x86-gcc3" || abi == "Darwin_ppc-gcc3") {
lib_name = "libvoikko.1.dylib";
} else {
throw "Unsupported ABI " + abi;
}

* https://github.com/stephenfox/iceweasel-dev/blob/c1ebf8be93add288837377e4fdd87f9c9f1082cc/l10n-gu-IN/services/crypto/modules/WeaveCrypto.js#L112

let os = Services.appinfo.OS;
switch (os) {
case "WINNT":
case "WINMO":
case "WINCE":
nssfile.append("nss3.dll");
break;
case "Darwin":
nssfile.append("libnss3.dylib");
break;
case "Linux":
case "SunOS":
case "WebOS": // Palm Pre
nssfile.append("libnss3.so");
break;
case "Android":
// Android uses a $GREDIR/lib/ subdir.
nssfile.append("lib");
nssfile.append("libnss3.so");
break;
default:
throw this.makeException("unsupported platform: " + os, Cr.NS_ERROR_UNEXPECTED);
}

* https://github.com/mozilla/deuxdrop/blob/2404f3fccaf762dfb935ee1563f68ca2c61d32b4/clients/addon/lib/nacl.js#L68

let runtime = Cc["@mozilla.org/xre/app-info;1"]
.getService(Ci.nsIXULRuntime);
let platLibName;
switch (runtime.OS) {
case 'WINNT':
if (numbits !== 32)
throw new Error('64-bit windows not supported right now.');
platLibName = 'nacl-i686.dll';
break;
case 'Linux':
platLibName = 'libnacl-' + platCode + '.so';
break;
case 'Darwin':
if (numbits !== 64)
throw new Error('32-bit OS X not supported right now.');
platLibName = 'libnacl-x86_64.dylib';
break;
case 'Android':
platLibName = 'libnacl-arm.so';
break;
default:
throw new Error('No native library for platform: ' + runtime.OS);
}


* https://github.com/ochameau/adbhelper/blob/fd3073a0f5f51e1707a5b4cbace82b13fb5a1fe5/subprocess.js#L311

function getPlatformValue(valueType) {
if (! gXulRuntime)
gXulRuntime = Cc["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULRuntime);
const platformDefaults = {
// Windows API:
'winnt': [ 'kernel32.dll' ],
// Unix API:
// library name O_NONBLOCK RLIM_T RLIMIT_NOFILE
'darwin': [ 'libc.dylib', 0x04 , ctypes.uint64_t , 8 ],
'linux': [ 'libc.so.6', 2024 , ctypes.unsigned_long, 7 ],
'freebsd': [ 'libc.so.7', 0x04 , ctypes.int64_t , 8 ],
'openbsd': [ 'libc.so.61.0', 0x04 , ctypes.int64_t , 8 ],
'sunos': [ 'libc.so', 0x80 , ctypes.unsigned_long, 5 ]
}
return platformDefaults[gXulRuntime.OS.toLowerCase()][valueType];
}

* a method to get platform name:


var hh = Cc["@mozilla.org/network/protocol;1?name=http"].getService(Ci.nsIHttpProtocolHandler);
var plat = hh["platform"];
on win8.1 this returns "Windows"

* interesting way to defined NULL https://github.com/mozilla/libadb.js/blob/d90624bef3830b357ab907b7b26f1f5f954efbcd/addon/adb-types.js#L17

* more lib names from irc


let libc = new SharedAll.Library("libc", "libc.so", "libSystem.B.dylib", "a.out");

* null on windows?

const NULL = ctypes.cast(ctypes.uint64_t(0x0), ctypes.void_t.ptr);