fn consume(&mut self, buf: &mut [u8], read: &mut usize) -> bool {
        let mut chunk = match self.data.peek_mut() {
            Some(chunk) => chunk,
            None => return false,
        };

        // If this chunk is either after the current offset or fully before it,
        // return directly, indicating whether the chunk can be discarded.
        if chunk.offset > self.bytes_read {
            return false;
        } else if (chunk.offset + chunk.bytes.len() as u64) <= self.bytes_read {
            return true;
        }

        // Determine `start` and `len` of slice to read from chunk
        let start = (self.bytes_read - chunk.offset) as usize;
        let left = buf.len() - *read;
        let len = left.min(chunk.bytes.len() - start) as usize;

        // Actually write into the buffer and update the related state
        (&mut buf[*read..*read + len]).copy_from_slice(&chunk.bytes[start..start + len]);
        *read += len;
        self.bytes_read += len as u64;

        if start + len == chunk.bytes.len() {
            // This chunk has been fully consumed and can be discarded
            true
        } else {
            // Mutate the chunk; `peek_mut()` is documented to update the heap's ordering
            // accordingly if necessary on dropping the `PeekMut`. Don't pop the chunk.
            chunk.offset = chunk.offset + start as u64 + len as u64;
            chunk.bytes.advance(start + len);
            false
        }
    }
// Read as much from the first chunk in the heap as fits in the buffer.
// Takes the buffer to read into and the amount of bytes that has already
// been read into it. Returns whether the first chunk has been fully consumed.
Read as much from the first chunk in the heap as fits in the buffer.
Takes the buffer to read into and the amount of bytes that has already
been read into it. Returns whether the first chunk has been fully consumed.
Read as much from the first chunk in the heap as fits in the buffer . Takes the buffer to read into and the amount of bytes that has already been read into it . Returns whether the first chunk has been fully consumed .
fn consume(&mut self, buf: &mut [u8], read: &mut usize) -> bool {
        let mut chunk = match self.data.peek_mut() {
            Some(chunk) => chunk,
            None => return false,
        };
        // If this chunk is either after the current offset or fully before it,
        // return directly, indicating whether the chunk can be discarded.
        if chunk.offset > self.bytes_read {
            return false;
        } else if (chunk.offset + chunk.bytes.len() as u64) <= self.bytes_read {
            return true;
        }
        // Determine `start` and `len` of slice to read from chunk
        let start = (self.bytes_read - chunk.offset) as usize;
        let left = buf.len() - *read;
        let len = left.min(chunk.bytes.len() - start) as usize;
        // Actually write into the buffer and update the related state
        (&mut buf[*read..*read + len]).copy_from_slice(&chunk.bytes[start..start + len]);
        *read += len;
        self.bytes_read += len as u64;
        if start + len == chunk.bytes.len() {
            // This chunk has been fully consumed and can be discarded
            true
        } else {
            // Mutate the chunk; `peek_mut()` is documented to update the heap's ordering
            // accordingly if necessary on dropping the `PeekMut`. Don't pop the chunk.
            chunk.offset = chunk.offset + start as u64 + len as u64;
            chunk.bytes.advance(start + len);
            false
        }
    }
fn consume ( & mut self , buf : & mut [ u8 ] , read : & mut usize ) -> bool { let mut chunk = match self . data . peek_mut ( ) { Some ( chunk ) => chunk , None => return false , } ; // If this chunk is either after the current offset or fully before it, // return directly, indicating whether the chunk can be discarded. if chunk . offset > self . bytes_read { return false ; } else if ( chunk . offset + chunk . bytes . len ( ) as u64 ) <= self . bytes_read { return true ; } // Determine `start` and `len` of slice to read from chunk let start = ( self . bytes_read - chunk . offset ) as usize ; let left = buf . len ( ) - * read ; let len = left . min ( chunk . bytes . len ( ) - start ) as usize ; // Actually write into the buffer and update the related state ( & mut buf [ * read .. * read + len ] ) . copy_from_slice ( & chunk . bytes [ start .. start + len ] ) ; * read += len ; self . bytes_read += len as u64 ; if start + len == chunk . bytes . len ( ) { // This chunk has been fully consumed and can be discarded true } else { // Mutate the chunk; `peek_mut()` is documented to update the heap's ordering // accordingly if necessary on dropping the `PeekMut`. Don't pop the chunk. chunk . offset = chunk . offset + start as u64 + len as u64 ; chunk . bytes . advance ( start + len ) ; false } }
Read as much from the first chunk in the heap as fits in the buffer.
Read as much from the first chunk in the heap as fits in the buffer .
&mut self
buf
&mut [u8]
read
&mut usize