yu.bytes source code

1 module yu.bytes;
2 
3 import core.stdc.string;
4 import std.traits;
5 import std.bitmanip;
6 import yu.traits;
7 
8 ptrdiff_t findCharByte(T)(in T[] data, in T ch) if (isCharByte!(T)) {
9     if (data.length == 0)
10         return -1;
11     ptrdiff_t index = -1;
12     auto ptr = memchr(data.ptr, ch, data.length);
13     if (ptr !is null) {
14         index = cast(ptrdiff_t)((cast(T*) ptr) - data.ptr);
15     }
16 
17     return index;
18 }
19 
20 ptrdiff_t findCharBytes(T)(in T[] data, in T[] chs) if (isCharByte!(T)) {
21     if (data.length < chs.length || data.length == 0 || chs.length == 0)
22         return -1;
23     ptrdiff_t index = -1;
24     size_t rsize = 0;
25     while (rsize < data.length) {
26         auto tdata = data[rsize .. $];
27         auto ptr = memchr(tdata.ptr, chs[0], tdata.length);
28         if (ptr is null)
29             break;
30 
31         size_t fistindex = (cast(T*) ptr) - tdata.ptr;
32         if (tdata.length - fistindex < chs.length)
33             break;
34 
35         size_t i = 1;
36         size_t j = fistindex + 1;
37         while (i < chs.length && j < tdata.length) {
38             if (chs[i] != tdata[j]) {
39                 rsize += fistindex + 1;
40                 goto next;
41             }
42             ++i;
43             ++j;
44         }
45         index = cast(ptrdiff_t)(rsize + fistindex);
46         break;
47     next:
48         continue;
49     }
50     return index;
51 }
52 
53 template endianToNative(bool litte, T) {
54     static if (litte)
55         alias endianToNative = littleEndianToNative!(T, T.sizeof);
56     else
57         alias endianToNative = bigEndianToNative!(T, T.sizeof);
58 }
59 
60 template nativeToEndian(bool litte, T) {
61     static if (litte)
62         alias nativeToEndian = nativeToLittleEndian!(T);
63     else
64         alias nativeToEndian = nativeToBigEndian!(T);
65 
66 }
67 
68 unittest {
69     string hello = "hell worlf\r\nnext";
70     assert(findCharByte(hello, 'l') == 2);
71     assert(findCharBytes(hello, "worlf") == 5);
72 }