Struct DownloadAcceleration 

pub struct DownloadAcceleration { /* private fields */ }

Download acceleration in bytes per second squared (fixed-point representation)

Internally stores bytes_per_second_sq * SCALE for precision. Supports negative values for deceleration.

下载加速度（单位：字节每秒平方，定点数表示）

内部存储 bytes_per_second_sq * SCALE 以保持精度。 支持负值表示减速。

Implementations

impl DownloadAcceleration

pub fn from_raw(bytes_per_second_sq: i64) -> Self

Create a new download acceleration from raw bytes per second squared

Parameters

• bytes_per_second_sq: Non-zero acceleration in bytes per second squared

Note

For negative acceleration, use as u64 conversion of i64 to ensure proper sign handling

从原始字节/秒²创建一个新的下载加速度实例

参数

• bytes_per_second_sq: 非零的字节/秒²加速度值

注意

对于负加速度，使用 i64 的 as u64 转换，确保正确处理符号位

pub fn new(initial_speed: u64, final_speed: u64, duration: Duration) -> Self

Create a new download acceleration from speed change and time interval

Uses pure integer arithmetic with nanosecond precision.

Parameters

• initial_speed: Initial speed in bytes per second (can be zero)
• final_speed: Final speed in bytes per second (can be zero)
• duration: Time interval for the speed change

从下载速度变化量和时间间隔创建一个新的下载加速度实例

使用纯整数运算，保持纳秒级精度。

参数

• initial_speed: 初始速度（字节/秒，可以为零）
• final_speed: 最终速度（字节/秒，可以为零）
• duration: 速度变化所用的时间

pub fn as_scaled(&self) -> i128

Get the internal scaled value (for advanced usage)

获取内部缩放值（高级用途）

pub fn as_i64(&self) -> i64

Get the acceleration in bytes per second squared as i64 (floored)

以 i64 的形式获取字节每秒平方（向下取整）

pub fn as_f64(&self) -> f64

Get the acceleration as f64 (for compatibility)

以 f64 的形式获取加速度（兼容用途）

pub fn predict_eta( &self, current_speed: u64, remaining_bytes: u64, ) -> Option<f64>

Predicts the time remaining (in seconds) for a download to complete considering acceleration.

Parameters

• current_speed: Current download speed in bytes per second
• remaining_bytes: Non-zero remaining bytes to download

Returns

• Some(f64): Estimated time remaining in seconds
• None: If the time is infinite, or if the input is invalid

Behavior

• Returns None if current_speed is zero
• Falls back to linear prediction if acceleration is negligible
• Handles edge cases gracefully without panicking

预测考虑加速度的下载剩余时间（秒）

参数

• current_speed: 当前下载速度（字节/秒）
• remaining_bytes: 剩余要下载的字节数（非零）

返回

• Some(f64): 估计的剩余时间（秒）
• None: 如果时间为无限大，或输入无效

行为

• 如果 current_speed 为零，返回 None
• 如果加速度可忽略，则回退到线性预测
• 优雅处理边界情况，不会导致程序崩溃

Trait Implementations

impl Clone for DownloadAcceleration

fn clone(&self) -> DownloadAcceleration

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DownloadAcceleration

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl FileSizeFormat for DownloadAcceleration

fn get_si_parts(&self) -> (String, &'static str)

Returns the formatted value and unit in SI (base-1000) standard

返回 SI (base-1000) 标准的 (formatted_value, unit)

fn get_iec_parts(&self) -> (String, &'static str)

Returns the formatted value and unit in IEC (base-1024) standard

返回 IEC (base-1024) 标准的 (formatted_value, unit)

fn to_si_string(&self) -> String

Returns a formatted string in SI (base-1000) standard

fn to_iec_string(&self) -> String

Returns a formatted string in IEC (base-1024) standard

fn to_formatted(self, standard: SizeStandard) -> FormattedValue<Self>

impl Ord for DownloadAcceleration

fn cmp(&self, other: &DownloadAcceleration) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for DownloadAcceleration

fn eq(&self, other: &DownloadAcceleration) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for DownloadAcceleration

fn partial_cmp(&self, other: &DownloadAcceleration) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for DownloadAcceleration

impl Eq for DownloadAcceleration

impl StructuralPartialEq for DownloadAcceleration