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use crate::{BinaryReader, Result, SectionIteratorLimited, SectionReader, SectionWithLimitedItems};
use std::ops::Range;
#[derive(Debug, Copy, Clone)]
pub struct ProducersFieldValue<'a> {
pub name: &'a str,
pub version: &'a str,
}
pub struct ProducersFieldValuesReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
impl<'a> ProducersFieldValuesReader<'a> {
pub fn get_count(&self) -> u32 {
self.count
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
fn skip(reader: &mut BinaryReader, values_count: u32) -> Result<()> {
for _ in 0..values_count {
reader.skip_string()?;
reader.skip_string()?;
}
Ok(())
}
pub fn read<'b>(&mut self) -> Result<ProducersFieldValue<'b>>
where
'a: 'b,
{
let name = self.reader.read_string()?;
let version = self.reader.read_string()?;
Ok(ProducersFieldValue { name, version })
}
}
impl<'a> IntoIterator for ProducersFieldValuesReader<'a> {
type Item = Result<ProducersFieldValue<'a>>;
type IntoIter = ProducersFieldValuesIterator<'a>;
fn into_iter(self) -> Self::IntoIter {
let count = self.count;
ProducersFieldValuesIterator {
reader: self,
left: count,
err: false,
}
}
}
pub struct ProducersFieldValuesIterator<'a> {
reader: ProducersFieldValuesReader<'a>,
left: u32,
err: bool,
}
impl<'a> Iterator for ProducersFieldValuesIterator<'a> {
type Item = Result<ProducersFieldValue<'a>>;
fn next(&mut self) -> Option<Self::Item> {
if self.err || self.left == 0 {
return None;
}
let result = self.reader.read();
self.err = result.is_err();
self.left -= 1;
Some(result)
}
fn size_hint(&self) -> (usize, Option<usize>) {
let count = self.reader.get_count() as usize;
(count, Some(count))
}
}
#[derive(Debug, Copy, Clone)]
pub struct ProducersField<'a> {
pub name: &'a str,
values_count: u32,
values_data: &'a [u8],
values_offset: usize,
}
impl<'a> ProducersField<'a> {
pub fn get_producer_field_values_reader<'b>(&self) -> Result<ProducersFieldValuesReader<'b>>
where
'a: 'b,
{
Ok(ProducersFieldValuesReader {
reader: BinaryReader::new_with_offset(self.values_data, self.values_offset),
count: self.values_count,
})
}
}
pub struct ProducersSectionReader<'a> {
reader: BinaryReader<'a>,
count: u32,
}
impl<'a> ProducersSectionReader<'a> {
pub fn new(data: &'a [u8], offset: usize) -> Result<ProducersSectionReader<'a>> {
let mut reader = BinaryReader::new_with_offset(data, offset);
let count = reader.read_var_u32()?;
Ok(ProducersSectionReader { reader, count })
}
pub fn original_position(&self) -> usize {
self.reader.original_position()
}
pub fn get_count(&self) -> u32 {
self.count
}
pub fn read<'b>(&mut self) -> Result<ProducersField<'b>>
where
'a: 'b,
{
let name = self.reader.read_string()?;
let values_count = self.reader.read_var_u32()?;
let values_start = self.reader.position;
ProducersFieldValuesReader::skip(&mut self.reader, values_count)?;
let values_end = self.reader.position;
Ok(ProducersField {
name,
values_count,
values_data: &self.reader.buffer[values_start..values_end],
values_offset: self.reader.original_offset + values_start,
})
}
}
impl<'a> SectionReader for ProducersSectionReader<'a> {
type Item = ProducersField<'a>;
fn read(&mut self) -> Result<Self::Item> {
ProducersSectionReader::read(self)
}
fn eof(&self) -> bool {
self.reader.eof()
}
fn original_position(&self) -> usize {
ProducersSectionReader::original_position(self)
}
fn range(&self) -> Range<usize> {
self.reader.range()
}
}
impl<'a> SectionWithLimitedItems for ProducersSectionReader<'a> {
fn get_count(&self) -> u32 {
ProducersSectionReader::get_count(self)
}
}
impl<'a> IntoIterator for ProducersSectionReader<'a> {
type Item = Result<ProducersField<'a>>;
type IntoIter = SectionIteratorLimited<ProducersSectionReader<'a>>;
fn into_iter(self) -> Self::IntoIter {
SectionIteratorLimited::new(self)
}
}