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use std::collections::HashMap;
const DEFAULT_CHUNK_SIZE: usize = 1024 * 1024; // 1MB
fn get_chunk_size(params: &HashMap<&str, &str>) -> usize {
params
.get("size")
.and_then(|s| s.parse().ok())
.unwrap_or(DEFAULT_CHUNK_SIZE)
}
pub async fn chunk_fixed_size(raw_data: &[u8], params: &HashMap<&str, &str>) -> Vec<u32> {
let chunk_size = get_chunk_size(params);
(chunk_size..raw_data.len())
.step_by(chunk_size)
.map(|pos| pos as u32)
.collect()
}
#[derive(Default)]
pub struct FixedSizeStream {
processed_bytes: usize,
}
pub async fn chunk_fixed_size_stream(
_current_data: &[u8],
len: u32,
stream: &mut FixedSizeStream,
params: &HashMap<&str, &str>,
) -> Option<u32> {
let chunk_size = get_chunk_size(params);
let valid_len = len as usize;
let prev_chunk = stream.processed_bytes / chunk_size;
let new_processed = stream.processed_bytes + valid_len;
let new_chunk = new_processed / chunk_size;
if prev_chunk != new_chunk {
// Find chunk boundary in current data, update processed bytes, return position
let boundary_in_chunk = chunk_size - (stream.processed_bytes % chunk_size);
stream.processed_bytes += boundary_in_chunk;
Some(boundary_in_chunk.min(valid_len) as u32)
} else {
// Update bytes processed
stream.processed_bytes = new_processed;
None
}
}
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