[英]C# encoding text RLE method
I'm trying to pack a given byte array by 'removing' repeated bytes, something like this: 我正在尝试通过“删除”重复的字节来打包给定的字节数组,如下所示:
If one byte is repeated more than 3 times I replace it with the counter. 如果重复一个字节超过3次,我将其替换为计数器。
I began with making a temporary byte list with no repeated values and list with numbers of appearances. 我从制作一个没有重复值的临时字节列表和带有出现次数的列表开始。 I've got a problem with the counter though:
我的柜台有问题:
public static void compressBlock(List<byte> buffer)
{
byte marker = buffer.Last();
int counter = 1;
byte[] buffer_ar = new byte[buffer.Count];
buffer_ar = buffer.ToArray();
List<byte> temp = new List<byte>();
List<int> tmp = new List<int>();
int indeks = 0;
while (true)
{
if (buffer_ar[indeks] == buffer_ar[indeks + 1])
{
counter++;
if (buffer_ar[indeks] != buffer_ar[indeks + 1])
{
temp.Add(buffer_ar[indeks]);
tmp.Add(counter);
//counter = 1;
}
}
else
{
//counter = 1;
temp.Add(buffer_ar[indeks]);
tmp.Add(counter);
}
indeks++;
//counter = 1;
if (buffer_ar.Length -1 <= indeks) { break; }
}
As the output I have: 作为输出,我有:
byte list: 255 1 4 200 15 10 字节列表:255 1 4 200 15 10
int list: 1 2 6 6 6 6 整数列表:1 2 6 6 6 6
I know I have to reset the counter at some point, but when I do that as the output of the int list I have: 1 1 1 1 1 1. 我知道我必须在某个时候重置计数器,但是当我将其作为int列表的输出时,我有:1 1 1 1 1 1。
Could someone point me in the right direction to do that? 有人可以指出我正确的方向吗?
You will never get here 你永远不会到这里
if (buffer_ar[indeks] != buffer_ar[indeks + 1])
because it is placed inside the inverted if 因为它被放置在倒立的内部
if (buffer_ar[indeks] == buffer_ar[indeks + 1])
So you would never add the counter to your array 因此,您永远不会将计数器添加到数组中
There're some issues with you implementation: 您的实现存在一些问题:
1 1 1 1
and 4 1
produce the same output : 4 1
1 1 1 1
和4 1
这样的不同输入会产生相同的输出 : 4 1
255 == Byte.MaxValue
) times? 255 == Byte.MaxValue
)次该怎么办? IEnumberable<Byte>
then concrete List<Byte>
IEnumberable<Byte>
然后使用concrete List<Byte>
You don't need any buffer , just count the last item occurence. 您不需要任何缓冲区 ,只需计算最后一项发生的次数即可。
public static IEnumerable<Byte> RleEncode(IEnumerable<Byte> source) { if (null == source) throw new ArgumentNullException("source"); const int threshold = 3; Byte current = 0; int count = 0; foreach (var item in source) if ((count == 0) || (current == item)) { current = item; count += 1; } else { if (count <= threshold) for (int i = 0; i < count; ++i) yield return current; else { for (int i = 0; i < count / Byte.MaxValue; ++i) { yield return Byte.MaxValue; yield return current; } if (count % Byte.MaxValue != 0) { yield return (Byte) (count % Byte.MaxValue); yield return current; } } current = item; count = 1; } // Tail if (count <= threshold) for (int i = 0; i < count; ++i) yield return current; else { for (int i = 0; i < count / Byte.MaxValue; ++i) { yield return Byte.MaxValue; yield return current; } if (count % Byte.MaxValue != 0) { yield return (Byte) (count % Byte.MaxValue); yield return current; } } }
Test 测试
List<Byte> source = new List<Byte> {
255, 1, 1, 4, 4, 4, 4, 4, 200, 15, 10
};
// 255 1 1 5 4 200 15 10
String test = String.Join(" ", RleEncode(source));
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