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util/error: refactor error handling

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This commit is contained in:
meh
2015-05-24 18:51:34 +02:00
parent 2716893612
commit 5b80b10949
13 changed files with 205 additions and 101 deletions
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232
src/util/error.rs
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@ -1,76 +1,150 @@
use std::error;
use std::fmt;
use std::cell::RefCell;
use std::ffi::CStr;
use std::str::from_utf8_unchecked;
use libc::c_int;
use ffi::*;
pub struct Error {
code: c_int,
desc: RefCell<Option<[i8; AV_ERROR_MAX_STRING_SIZE as usize]>>,
#[derive(Copy, Clone)]
pub enum Error {
Bug,
Bug2,
Unknown,
Experimental,
BufferTooSmall,
Eof,
Exit,
External,
InvalidData,
PatchWelcome,
InputChanged,
OutputChanged,
BsfNotFound,
DecoderNotFound,
DemuxerNotFound,
EncoderNotFound,
OptionNotFound,
MuxerNotFound,
FilterNotFound,
ProtocolNotFound,
StreamNotFound,
HttpBadRequest,
HttpUnauthorized,
HttpForbidden,
HttpNotFound,
HttpOther4xx,
HttpServerError,
}
impl Error {
pub fn new(code: c_int) -> Self {
Error { code: code, desc: RefCell::new(None) }
}
pub fn bug() -> Self {
Self::new(AVERROR_BUG)
}
pub fn eof() -> Self {
Self::new(AVERROR_EOF)
}
pub fn exit() -> Self {
Self::new(AVERROR_EXIT)
}
pub fn external() -> Self {
Self::new(AVERROR_EXTERNAL)
}
pub fn experimental() -> Self {
Self::new(AVERROR_EXPERIMENTAL)
}
pub fn unknown() -> Self {
Self::new(AVERROR_UNKNOWN)
}
pub fn invalid() -> Self {
Self::new(AVERROR_INVALIDDATA)
}
}
unsafe impl Send for Error { }
impl Clone for Error {
fn clone(&self) -> Self {
if let Some(old) = *self.desc.borrow() {
Error {
code: self.code,
desc: RefCell::new(Some(old)),
}
}
else {
Error {
code: self.code,
desc: RefCell::new(None),
}
pub fn index(self) -> usize {
match self {
Error::BsfNotFound => 0,
Error::Bug => 1,
Error::BufferTooSmall => 2,
Error::DecoderNotFound => 3,
Error::DemuxerNotFound => 4,
Error::EncoderNotFound => 5,
Error::Eof => 6,
Error::Exit => 7,
Error::External => 8,
Error::FilterNotFound => 9,
Error::InvalidData => 10,
Error::MuxerNotFound => 11,
Error::OptionNotFound => 12,
Error::PatchWelcome => 13,
Error::ProtocolNotFound => 14,
Error::StreamNotFound => 15,
Error::Bug2 => 16,
Error::Unknown => 17,
Error::Experimental => 18,
Error::InputChanged => 19,
Error::OutputChanged => 20,
Error::HttpBadRequest => 21,
Error::HttpUnauthorized => 22,
Error::HttpForbidden => 23,
Error::HttpNotFound => 24,
Error::HttpOther4xx => 25,
Error::HttpServerError => 26,
}
}
}
impl From<c_int> for Error {
fn from(value: c_int) -> Error {
Error::new(value)
match value {
AVERROR_BSF_NOT_FOUND => Error::BsfNotFound,
AVERROR_BUG => Error::Bug,
AVERROR_BUFFER_TOO_SMALL => Error::BufferTooSmall,
AVERROR_DECODER_NOT_FOUND => Error::DecoderNotFound,
AVERROR_DEMUXER_NOT_FOUND => Error::DemuxerNotFound,
AVERROR_ENCODER_NOT_FOUND => Error::EncoderNotFound,
AVERROR_EOF => Error::Eof,
AVERROR_EXIT => Error::Exit,
AVERROR_EXTERNAL => Error::External,
AVERROR_FILTER_NOT_FOUND => Error::FilterNotFound,
AVERROR_INVALIDDATA => Error::InvalidData,
AVERROR_MUXER_NOT_FOUND => Error::MuxerNotFound,
AVERROR_OPTION_NOT_FOUND => Error::OptionNotFound,
AVERROR_PATCHWELCOME => Error::PatchWelcome,
AVERROR_PROTOCOL_NOT_FOUND => Error::ProtocolNotFound,
AVERROR_STREAM_NOT_FOUND => Error::StreamNotFound,
AVERROR_BUG2 => Error::Bug2,
AVERROR_UNKNOWN => Error::Unknown,
AVERROR_EXPERIMENTAL => Error::Experimental,
AVERROR_INPUT_CHANGED => Error::InputChanged,
AVERROR_OUTPUT_CHANGED => Error::OutputChanged,
AVERROR_HTTP_BAD_REQUEST => Error::HttpBadRequest,
AVERROR_HTTP_UNAUTHORIZED => Error::HttpUnauthorized,
AVERROR_HTTP_FORBIDDEN => Error::HttpForbidden,
AVERROR_HTTP_NOT_FOUND => Error::HttpNotFound,
AVERROR_HTTP_OTHER_4XX => Error::HttpOther4xx,
AVERROR_HTTP_SERVER_ERROR => Error::HttpServerError,
_ => Error::Unknown
}
}
}
impl Into<c_int> for Error {
fn into(self) -> c_int {
match self {
Error::BsfNotFound => AVERROR_BSF_NOT_FOUND,
Error::Bug => AVERROR_BUG,
Error::BufferTooSmall => AVERROR_BUFFER_TOO_SMALL,
Error::DecoderNotFound => AVERROR_DECODER_NOT_FOUND,
Error::DemuxerNotFound => AVERROR_DEMUXER_NOT_FOUND,
Error::EncoderNotFound => AVERROR_ENCODER_NOT_FOUND,
Error::Eof => AVERROR_EOF,
Error::Exit => AVERROR_EXIT,
Error::External => AVERROR_EXTERNAL,
Error::FilterNotFound => AVERROR_FILTER_NOT_FOUND,
Error::InvalidData => AVERROR_INVALIDDATA,
Error::MuxerNotFound => AVERROR_MUXER_NOT_FOUND,
Error::OptionNotFound => AVERROR_OPTION_NOT_FOUND,
Error::PatchWelcome => AVERROR_PATCHWELCOME,
Error::ProtocolNotFound => AVERROR_PROTOCOL_NOT_FOUND,
Error::StreamNotFound => AVERROR_STREAM_NOT_FOUND,
Error::Bug2 => AVERROR_BUG2,
Error::Unknown => AVERROR_UNKNOWN,
Error::Experimental => AVERROR_EXPERIMENTAL,
Error::InputChanged => AVERROR_INPUT_CHANGED,
Error::OutputChanged => AVERROR_OUTPUT_CHANGED,
Error::HttpBadRequest => AVERROR_HTTP_BAD_REQUEST,
Error::HttpUnauthorized => AVERROR_HTTP_UNAUTHORIZED,
Error::HttpForbidden => AVERROR_HTTP_FORBIDDEN,
Error::HttpNotFound => AVERROR_HTTP_NOT_FOUND,
Error::HttpOther4xx => AVERROR_HTTP_OTHER_4XX,
Error::HttpServerError => AVERROR_HTTP_SERVER_ERROR,
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
f.write_str(error::Error::description(self))
@ -80,25 +154,55 @@ impl fmt::Display for Error {
impl fmt::Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
try!(f.write_str("ffmpeg::Error("));
try!(f.write_str(&format!("{}: ", AVUNERROR(self.code))));
try!(f.write_str(&format!("{}: ", AVUNERROR((*self).into()))));
try!(fmt::Display::fmt(self, f));
f.write_str(")")
}
}
// XXX: the length has to be synced with the number of errors
static mut STRINGS: [[i8; AV_ERROR_MAX_STRING_SIZE as usize]; 27]
= [[0i8; AV_ERROR_MAX_STRING_SIZE as usize]; 27];
pub fn register_all() {
unsafe {
av_strerror(Error::Bug.into(), STRINGS[Error::Bug.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::Bug2.into(), STRINGS[Error::Bug2.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::Unknown.into(), STRINGS[Error::Unknown.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::Experimental.into(), STRINGS[Error::Experimental.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::BufferTooSmall.into(), STRINGS[Error::BufferTooSmall.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::Eof.into(), STRINGS[Error::Eof.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::Exit.into(), STRINGS[Error::Exit.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::External.into(), STRINGS[Error::External.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::InvalidData.into(), STRINGS[Error::InvalidData.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::PatchWelcome.into(), STRINGS[Error::PatchWelcome.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::InputChanged.into(), STRINGS[Error::InputChanged.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::OutputChanged.into(), STRINGS[Error::OutputChanged.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::BsfNotFound.into(), STRINGS[Error::BsfNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::DecoderNotFound.into(), STRINGS[Error::DecoderNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::DemuxerNotFound.into(), STRINGS[Error::DemuxerNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::EncoderNotFound.into(), STRINGS[Error::EncoderNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::OptionNotFound.into(), STRINGS[Error::OptionNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::MuxerNotFound.into(), STRINGS[Error::MuxerNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::FilterNotFound.into(), STRINGS[Error::FilterNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::ProtocolNotFound.into(), STRINGS[Error::ProtocolNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::StreamNotFound.into(), STRINGS[Error::StreamNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::HttpBadRequest.into(), STRINGS[Error::HttpBadRequest.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::HttpUnauthorized.into(), STRINGS[Error::HttpUnauthorized.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::HttpForbidden.into(), STRINGS[Error::HttpForbidden.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::HttpNotFound.into(), STRINGS[Error::HttpNotFound.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::HttpOther4xx.into(), STRINGS[Error::HttpOther4xx.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
av_strerror(Error::HttpServerError.into(), STRINGS[Error::HttpServerError.index()].as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
}
}
impl error::Error for Error {
fn description(&self) -> &str {
unsafe {
let mut desc = self.desc.borrow_mut();
if let None = *desc {
let mut buf = [0i8; AV_ERROR_MAX_STRING_SIZE as usize];
av_strerror(self.code, buf.as_mut_ptr(), AV_ERROR_MAX_STRING_SIZE);
*desc = Some(buf);
}
from_utf8_unchecked(CStr::from_ptr(desc.unwrap().as_ptr()).to_bytes())
from_utf8_unchecked(CStr::from_ptr(STRINGS[self.index()].as_ptr()).to_bytes())
}
}
}