86 lines
2 KiB
Rust
86 lines
2 KiB
Rust
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use std::convert::TryFrom;
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use std::ptr;
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use super::{Error, Value};
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use crate::error::check_status;
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use crate::{sys, Result};
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#[derive(Debug)]
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pub struct JsBigint(pub(crate) Value);
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/// The BigInt will be converted losslessly when the value is over what an int64 could hold.
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impl TryFrom<JsBigint> for i64 {
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type Error = Error;
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fn try_from(value: JsBigint) -> Result<i64> {
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value.get_i64().map(|(v, _)| v)
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}
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}
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/// The BigInt will be converted losslessly when the value is over what an uint64 could hold.
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impl TryFrom<JsBigint> for u64 {
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type Error = Error;
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fn try_from(value: JsBigint) -> Result<u64> {
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value.get_u64().map(|(v, _)| v)
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}
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}
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impl JsBigint {
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/// https://nodejs.org/api/n-api.html#n_api_napi_get_value_bigint_words
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pub fn get_words(&self, sign_bit: bool) -> Result<Vec<u64>> {
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let mut word_count: u64 = 0;
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check_status(unsafe {
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sys::napi_get_value_bigint_words(
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self.0.env,
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self.0.value,
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ptr::null_mut(),
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&mut word_count,
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ptr::null_mut(),
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)
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})?;
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let mut words: Vec<u64> = Vec::with_capacity(word_count as usize);
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let mut sign_bit = match sign_bit {
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true => 1,
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false => 0,
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};
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check_status(unsafe {
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sys::napi_get_value_bigint_words(
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self.0.env,
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self.0.value,
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&mut sign_bit,
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&mut word_count,
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words.as_mut_ptr(),
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)
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})?;
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unsafe {
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words.set_len(word_count as usize);
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};
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Ok(words)
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}
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#[inline]
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pub fn get_u64(&self) -> Result<(u64, bool)> {
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let mut val: u64 = 0;
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let mut loss = false;
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check_status(unsafe {
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sys::napi_get_value_bigint_uint64(self.0.env, self.0.value, &mut val, &mut loss)
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})?;
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Ok((val, loss))
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}
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#[inline]
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pub fn get_i64(&self) -> Result<(i64, bool)> {
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let mut val: i64 = 0;
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let mut loss: bool = false;
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check_status(unsafe {
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sys::napi_get_value_bigint_int64(self.0.env, self.0.value, &mut val, &mut loss)
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})?;
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Ok((val, loss))
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}
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}
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