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Add functions to System.IO.Stream

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This commit is contained in:
moneyl 2021-03-16 19:06:01 -04:00
parent 4322c984cc
commit 7cc95c2b07
1 changed files with 52 additions and 0 deletions
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52
BeefLibs/corlib/src/IO/Stream.bf
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@ -63,6 +63,58 @@ namespace System.IO
public abstract Result<int> TryWrite(Span<uint8> data);
public abstract void Close();
//Read value from stream without changing position. Position won't change even if it returns .Err
public Result<T> Peek<T>() where T : struct
{
T val = ?;
int size = Try!(TryRead(.((uint8*)&val, sizeof(T))));
Seek(Position - size, .Absolute);
if (size != sizeof(T))
return .Err;
return .Ok(val);
}
//Skip count bytes
public void Skip(int64 count)
{
Seek(Position + count, .Absolute);
}
//Write count null bytes to stream
public void WriteNullBytes(int64 count)
{
if(count <= 0)
return;
int64 nullBytesRemaining = count;
int64 emptyData = 0;
while (nullBytesRemaining > 0)
{
int64 writeSize = Math.Min(nullBytesRemaining, sizeof(decltype(emptyData)));
TryWrite(.((uint8*)&emptyData, (int)writeSize));
nullBytesRemaining -= writeSize;
}
}
//Read sized string from stream
public Result<void> ReadSizedString(int64 size, String output)
{
if (size <= 0)
return .Err;
for (int64 i = 0; i < size; i++)
{
Result<char8> char = Read<char8>();
if (char == .Err)
return .Err;
output.Append(char);
}
return .Ok;
}
public Result<T> Read<T>() where T : struct
{
T val = ?;