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Merge pull request #116 from dominic-mulligan-arm/runtime-manager-linux
Ported Veracruz to Linux
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| //! Common file descriptor-related material | ||
| //! | ||
| //! # Authors | ||
| //! | ||
| //! The Veracruz Development Team. | ||
| //! | ||
| //! # Copyright and licensing | ||
| //! | ||
| //! See the `LICENSE.markdown` file in the Veracruz root directory for copyright | ||
| //! and licensing information. | ||
| use byteorder::{ByteOrder, LittleEndian}; | ||
|
|
||
| /// Sends a `buffer` of data (by first transmitting an encoded length followed by | ||
| /// the data proper) to the file descriptor `fd`. | ||
| pub fn send_buffer<T>(mut fd: T, buffer: &[u8]) -> Result<(), std::io::Error> | ||
| where | ||
| T: std::io::Write, | ||
| { | ||
| let len = buffer.len(); | ||
|
|
||
| // 1: Encode the data length and send it. | ||
| { | ||
| let mut buff = [0u8; 9]; | ||
| LittleEndian::write_u64(&mut buff, len as u64); | ||
|
|
||
| let mut sent_bytes = 0; | ||
|
|
||
| while sent_bytes < 9 { | ||
| sent_bytes += fd.write(&buff[sent_bytes..9])?; | ||
| } | ||
| } | ||
|
|
||
| // 2. Send the data proper. | ||
| { | ||
| let mut sent_bytes = 0; | ||
|
|
||
| while sent_bytes < len { | ||
| sent_bytes += fd.write(&buffer[sent_bytes..len])?; | ||
| } | ||
| } | ||
|
|
||
| Ok(()) | ||
| } | ||
|
|
||
| /// Reads a buffer of data from a file descriptor `fd` by first reading a length | ||
| /// of data, followed by the data proper. | ||
| pub fn receive_buffer<T>(mut fd: T) -> Result<Vec<u8>, std::io::Error> | ||
| where | ||
| T: std::io::Read, | ||
| { | ||
| // 1. First read and decode the length of the data proper. | ||
| let length = { | ||
| let mut buff = [0u8; 9]; | ||
| let mut received_bytes = 0; | ||
|
|
||
| while received_bytes < 9 { | ||
| received_bytes += fd.read(&mut buff[received_bytes..9])?; | ||
| } | ||
|
|
||
| LittleEndian::read_u64(&buff) as usize | ||
| }; | ||
|
|
||
| // 2. Next, read the data proper. | ||
| let mut buffer = vec![0u8; length]; | ||
|
|
||
| { | ||
| let mut received_bytes = 0; | ||
|
|
||
| while received_bytes < length { | ||
| received_bytes += fd.read(&mut buffer[received_bytes..length])?; | ||
| } | ||
| } | ||
|
|
||
| Ok(buffer) | ||
| } |
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