openjp2 0.3.4

Rust port of Openjpeg.
Documentation 
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use super::openjpeg::*;

use super::malloc::*;

#[repr(C)]
#[derive(Copy, Clone)]
pub struct opj_bio {
  pub start: *mut OPJ_BYTE,
  pub end: *mut OPJ_BYTE,
  pub bp: *mut OPJ_BYTE,
  pub buf: OPJ_UINT32,
  pub ct: OPJ_UINT32,
}
pub type opj_bio_t = opj_bio;
/* *
Write a byte
@param bio BIO handle
@return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
*/
/*@}*/
/*@}*/
/*
==========================================================
   local functions
==========================================================
*/
unsafe fn opj_bio_byteout(mut bio: *mut opj_bio_t) -> OPJ_BOOL {
  (*bio).buf = (*bio).buf << 8i32 & 0xffffu32;
  (*bio).ct = if (*bio).buf == 0xff00u32 { 7i32 } else { 8i32 } as OPJ_UINT32;
  if (*bio).bp as OPJ_SIZE_T >= (*bio).end as OPJ_SIZE_T {
    return 0i32;
  }
  let fresh0 = (*bio).bp;
  (*bio).bp = (*bio).bp.offset(1);
  *fresh0 = ((*bio).buf >> 8i32) as OPJ_BYTE;
  1i32
}
/* *
Read a byte
@param bio BIO handle
@return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
*/
unsafe fn opj_bio_bytein(mut bio: *mut opj_bio_t) -> OPJ_BOOL {
  (*bio).buf = (*bio).buf << 8i32 & 0xffffu32;
  (*bio).ct = if (*bio).buf == 0xff00u32 { 7i32 } else { 8i32 } as OPJ_UINT32;
  if (*bio).bp as OPJ_SIZE_T >= (*bio).end as OPJ_SIZE_T {
    return 0i32;
  }
  let fresh1 = (*bio).bp;
  (*bio).bp = (*bio).bp.offset(1);
  (*bio).buf |= *fresh1 as core::ffi::c_uint;
  1i32
}
/*
 * The copyright in this software is being made available under the 2-clauses
 * BSD License, included below. This software may be subject to other third
 * party and contributor rights, including patent rights, and no such rights
 * are granted under this license.
 *
 * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2014, Professor Benoit Macq
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2007, Francois-Olivier Devaux
 * Copyright (c) 2003-2014, Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
/* * @defgroup BIO BIO - Individual bit input-output stream */
/*@{*/
/* * @name Local static functions */
/*@{*/
/* *
Read a bit
@param bio BIO handle
@return Returns the read bit
*/
unsafe fn opj_bio_getbit(mut bio: *mut opj_bio_t) -> OPJ_UINT32 {
  if (*bio).ct == 0u32 {
    opj_bio_bytein(bio);
    /* MSD: why not check the return value of this function ? */
  }
  (*bio).ct = (*bio).ct.wrapping_sub(1);
  (*bio).buf >> (*bio).ct & 1u32
}
/*
==========================================================
   Bit Input/Output interface
==========================================================
*/
#[no_mangle]
pub(crate) unsafe fn opj_bio_create() -> *mut opj_bio_t {
  /* && (n <= 32U)*/
  opj_malloc(core::mem::size_of::<opj_bio_t>()) as *mut opj_bio_t
}
#[no_mangle]
pub(crate) unsafe fn opj_bio_destroy(mut bio: *mut opj_bio_t) {
  if !bio.is_null() {
    opj_free(bio as *mut core::ffi::c_void);
  };
}
#[no_mangle]
pub(crate) unsafe fn opj_bio_numbytes(mut bio: *mut opj_bio_t) -> isize {
  (*bio).bp.offset_from((*bio).start)
}
#[no_mangle]
pub(crate) unsafe fn opj_bio_init_enc(
  mut bio: *mut opj_bio_t,
  mut bp: *mut OPJ_BYTE,
  mut len: OPJ_UINT32,
) {
  (*bio).start = bp;
  (*bio).end = bp.offset(len as isize);
  (*bio).bp = bp;
  (*bio).buf = 0 as OPJ_UINT32;
  (*bio).ct = 8 as OPJ_UINT32;
}
#[no_mangle]
pub(crate) unsafe fn opj_bio_init_dec(
  mut bio: *mut opj_bio_t,
  mut bp: *mut OPJ_BYTE,
  mut len: OPJ_UINT32,
) {
  (*bio).start = bp;
  (*bio).end = bp.offset(len as isize);
  (*bio).bp = bp;
  (*bio).buf = 0 as OPJ_UINT32;
  (*bio).ct = 0 as OPJ_UINT32;
}
/* *
Write a bit
@param bio BIO handle
@param b Bit to write (0 or 1)
*/
#[no_mangle]
pub(crate) unsafe fn opj_bio_putbit(mut bio: *mut opj_bio_t, mut b: OPJ_UINT32) {
  if (*bio).ct == 0u32 {
    opj_bio_byteout(bio);
    /* MSD: why not check the return value of this function ? */
  }
  (*bio).ct -= 1;
  (*bio).buf |= b << (*bio).ct;
}
#[no_mangle]
pub(crate) unsafe fn opj_bio_write(mut bio: *mut opj_bio_t, mut v: OPJ_UINT32, mut n: OPJ_UINT32) {
  let mut i: OPJ_INT32 = 0;
  assert!(n > 0u32 && n <= 32u32);
  i = n as OPJ_INT32 - 1i32;
  while i >= 0i32 {
    opj_bio_putbit(bio, v >> i & 1u32);
    i -= 1
  }
}
#[no_mangle]
pub(crate) unsafe fn opj_bio_read(mut bio: *mut opj_bio_t, mut n: OPJ_UINT32) -> OPJ_UINT32 {
  let mut i: OPJ_INT32 = 0;
  let mut v: OPJ_UINT32 = 0;
  assert!(n > 0u32);
  v = 0u32;
  i = n as OPJ_INT32 - 1i32;
  while i >= 0i32 {
    v |= opj_bio_getbit(bio) << i;
    i -= 1
    /* can't overflow, opj_bio_getbit returns 0 or 1 */
  }
  v
}
#[no_mangle]
pub(crate) unsafe fn opj_bio_flush(mut bio: *mut opj_bio_t) -> OPJ_BOOL {
  if opj_bio_byteout(bio) == 0 {
    return 0i32;
  }
  if (*bio).ct == 7u32 && opj_bio_byteout(bio) == 0 {
    return 0i32;
  }
  1i32
}
#[no_mangle]
pub(crate) unsafe fn opj_bio_inalign(mut bio: *mut opj_bio_t) -> OPJ_BOOL {
  if (*bio).buf & 0xffu32 == 0xffu32 && opj_bio_bytein(bio) == 0 {
    return 0i32;
  }
  (*bio).ct = 0 as OPJ_UINT32;
  1i32
}