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added header clarification

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This commit is contained in:
mamoniot 2022-12-22 13:48:31 -05:00
parent e3e4337d2f
commit 3e90ca889d
1 changed files with 7 additions and 7 deletions
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14
zssp/src/zssp.rs
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@ -1378,13 +1378,13 @@ fn create_packet_header(
debug_assert!(packet_type <= 0x0f); // packet type is 4 bits
if fragment_count <= MAX_FRAGMENTS {
// Header indexed by bit:
// [0-31] counter
// [32-63] header check code (computed later)
// [64-111] recipient's session ID (unique on their side)
// [112-115] packet type (0-15)
// [116-121] number of fragments (0..63 for 1..64 fragments total)
// [122-127] fragment number (0, 1, 2, ...)
// Header indexed by bit/byte:
// [0-31]/[0-3] counter
// [32-63]/[4-7] header check code (computed later)
// [64-111]/[8-13] recipient's session ID (unique on their side)
// [112-115]/[14-] packet type (0-15)
// [116-121]/[-] number of fragments (0..63 for 1..64 fragments total)
// [122-127]/[-15] fragment number (0, 1, 2, ...)
memory::store_raw((counter.to_u32() as u64).to_le(), header_destination_buffer);
memory::store_raw(
(u64::from(recipient_session_id) | (packet_type as u64).wrapping_shl(48) | ((fragment_count - 1) as u64).wrapping_shl(52))