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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.IO; | ||
| using System.Threading.Tasks; | ||
| using System.Threading; | ||
| using System.Runtime.InteropServices; | ||
|
|
||
| namespace Apache.Arrow.Adbc.Drivers.Apache.Thrift | ||
| { | ||
| public static class StreamExtensions | ||
| { | ||
| public static void WriteInt32LittleEndian(int value, Span<byte> buffer, int offset) | ||
| { | ||
| if (buffer == null) | ||
| throw new ArgumentNullException(nameof(buffer)); | ||
|
|
||
| if (offset < 0 || offset > buffer.Length - sizeof(int)) | ||
| throw new ArgumentOutOfRangeException(nameof(offset), "Offset is outside the bounds of the buffer."); | ||
|
|
||
| // Ensure the buffer is large enough to hold an int starting from the offset | ||
| if (buffer.Length < offset + sizeof(int)) | ||
| throw new ArgumentException("Buffer too small to write an Int32 at the specified offset."); | ||
|
|
||
| // Write the integer in little-endian format | ||
| buffer[offset] = (byte)value; | ||
| buffer[offset + 1] = (byte)(value >> 8); | ||
| buffer[offset + 2] = (byte)(value >> 16); | ||
| buffer[offset + 3] = (byte)(value >> 24); | ||
| } | ||
|
|
||
| public static void ReverseEndianI32AtOffset(Span<byte> buffer, int offset) | ||
| { | ||
| // Check if the buffer is large enough to contain an i32 at the given offset | ||
| if (offset < 0 || buffer.Length < offset + sizeof(int)) | ||
| throw new ArgumentException("Buffer is too small or offset is out of bounds."); | ||
|
|
||
| // Swap the bytes to reverse the endianness of the i32 | ||
| // buffer[offset] and buffer[offset + 3] | ||
| // buffer[offset + 1] and buffer[offset + 2] | ||
| byte temp; | ||
|
|
||
| temp = buffer[offset]; | ||
| buffer[offset] = buffer[offset + 3]; | ||
| buffer[offset + 3] = temp; | ||
|
|
||
| temp = buffer[offset + 1]; | ||
| buffer[offset + 1] = buffer[offset + 2]; | ||
| buffer[offset + 2] = temp; | ||
| } | ||
| public static void ReverseEndiannessInt16(Span<byte> buffer, int offset) | ||
| { | ||
| if (buffer == null) | ||
| throw new ArgumentNullException(nameof(buffer)); | ||
|
|
||
| if (offset < 0 || offset > buffer.Length - sizeof(short)) | ||
| throw new ArgumentOutOfRangeException(nameof(offset), "Offset is outside the bounds of the buffer."); | ||
|
|
||
| // Swap the bytes to reverse the endianness of a 16-bit integer | ||
| (buffer[offset], buffer[offset + 1]) = (buffer[offset + 1], buffer[offset]); | ||
| } | ||
|
|
||
| public static TValue? GetValueOrDefault<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> dictionary, TKey key, TValue? defaultValue = default) | ||
| { | ||
| if (dictionary == null) throw new ArgumentNullException(nameof(dictionary)); | ||
|
|
||
| return dictionary.TryGetValue(key, out TValue value) ? value : defaultValue; | ||
| } | ||
|
|
||
| public static async Task<bool> ReadExactlyAsync(this Stream stream, Memory<byte> memory, CancellationToken cancellationToken = default) | ||
| { | ||
| if (stream == null) throw new ArgumentNullException(nameof(stream)); | ||
|
|
||
| // Try to get the underlying array from the Memory<byte> | ||
| if (!MemoryMarshal.TryGetArray(memory, out ArraySegment<byte> arraySegment)) | ||
| { | ||
| throw new InvalidOperationException("The provided Memory<byte> does not have an accessible underlying array."); | ||
| } | ||
|
|
||
| int totalBytesRead = 0; | ||
| int count = memory.Length; | ||
|
|
||
| while (totalBytesRead < count) | ||
| { | ||
| int bytesRead = await stream.ReadAsync(arraySegment.Array, arraySegment.Offset + totalBytesRead, count - totalBytesRead, cancellationToken).ConfigureAwait(false); | ||
|
|
||
| if (bytesRead == 0) | ||
| { | ||
| // End of the stream reached before reading the desired amount | ||
| return totalBytesRead == 0; | ||
| } | ||
|
|
||
| totalBytesRead += bytesRead; | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| public static async Task<bool> ReadExactlyAsync(this Stream stream, byte[] buffer, int offset, int count, CancellationToken cancellationToken = default) | ||
| { | ||
| if (stream == null) throw new ArgumentNullException(nameof(stream)); | ||
| if (buffer == null) throw new ArgumentNullException(nameof(buffer)); | ||
| if (offset < 0 || offset >= buffer.Length) throw new ArgumentOutOfRangeException(nameof(offset)); | ||
| if (count < 0 || (count + offset) > buffer.Length) throw new ArgumentOutOfRangeException(nameof(count)); | ||
|
|
||
| int bytesReadTotal = 0; | ||
|
|
||
| while (bytesReadTotal < count) | ||
| { | ||
| int bytesRead = await stream.ReadAsync(buffer, offset + bytesReadTotal, count - bytesReadTotal, cancellationToken).ConfigureAwait(false); | ||
|
|
||
| // If ReadAsync returns 0, it means the end of the stream has been reached | ||
| if (bytesRead == 0) | ||
| { | ||
| // If we haven't read any bytes at all, it's okay (might be at the end of the stream) | ||
| // But if we've read some bytes and then hit the end of the stream, it's unexpected | ||
| return bytesReadTotal == 0; | ||
| } | ||
|
|
||
| bytesReadTotal += bytesRead; | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
| } | ||
| } |
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