bmp.zig

pub fn fromFile(allocator: *Allocator, filePath: []const u8) !Bitmap {
        var result = init(allocator);

        var absolutePath = try path.resolve(allocator, &[_][]const u8{filePath});
        defer allocator.free(absolutePath);

        var file = try fs.openFileAbsolute(absolutePath, File.OpenFlags{});
        defer file.close();

        var fileInStream = file.inStream();
        try internalRead(&fileInStream.stream, &result);

        return result;
    }

    pub fn fromMemory(allocator: *Allocator, buffer: []const u8) !Bitmap {
        var result = init(allocator);

        var memoryInStream = SliceInStream.init(buffer);
        try internalRead(&memoryInStream.stream, &result);

        return result;
    }
    
fn internalRead(inStream: *io.InStream(anyerror), bitmap: *Bitmap) !void {
        _ = try inStream.read(bitmap.fileHeader.magicHeader[0..]);
        if (!mem.eql(u8, bitmap.fileHeader.magicHeader[0..], BitmapMagicHeader[0..])) {
            return errors.ImageError.InvalidHeader;
        }

        bitmap.fileHeader.size = try inStream.readIntLittle(u32);
        bitmap.fileHeader.reserved = try inStream.readIntLittle(u32);
        bitmap.fileHeader.pixelOffset = try inStream.readIntLittle(u32);
    }

error.log

C:\Programmation\Zig\GBA\zigimg\src\bmp.zig:82:39: error: expected type '*std.io.in_stream.InStream(anyerror)', found '*std.io.in_stream.InStream(std.os.ReadError)'
        try internalRead(&fileInStream.stream, &result);
                                      ^
C:\Programmation\Zig\GBA\zigimg\src\bmp.zig:82:39: note: pointer type child 'std.io.in_stream.InStream(std.os.ReadError)' cannot cast into pointer type child 'std.io.in_stream.InStream(anyerror)'
        try internalRead(&fileInStream.stream, &result);