+The functions in CIO.C have for goal to realize a byte input / output process.
+*/
+
+/** @defgroup CIO CIO - byte input-output stream */
+/*@{*/
+
+#include "opj_config.h"
+
+/** @name Exported functions (see also openjpeg.h) */
+/*@{*/
+/* ----------------------------------------------------------------------- */
+/**
+Number of bytes left before the end of the stream
+@param cio CIO handle
+@return Returns the number of bytes before the end of the stream
+*/
+OPJ_SIZE_T cio_numbytesleft(opj_cio_t *cio);
+/**
+Get pointer to the current position in the stream
+@param cio CIO handle
+@return Returns a pointer to the current position
+*/
+unsigned char *cio_getbp(opj_cio_t *cio);
+/**
+*/
+opj_bool cio_byteout(opj_cio_t *cio, unsigned char v);
+/**
+*/
+unsigned char cio_bytein(opj_cio_t *cio);
+/**
+Write some bytes
+@param cio CIO handle
+@param v Value to write
+@param n Number of bytes to write
+@return Returns the number of bytes written or 0 if an error occured
+*/
+unsigned int cio_write(opj_cio_t *cio, unsigned long long int v, int n);
+/**
+Read some bytes
+@param cio CIO handle
+@param n Number of bytes to read
+@return Returns the value of the n bytes read
+*/
+unsigned int cio_read(opj_cio_t *cio, int n);
+/**
+Skip some bytes
+@param cio CIO handle
+@param n Number of bytes to skip
+*/
+void cio_skip(opj_cio_t *cio, int n);
+/* ----------------------------------------------------------------------- */
+/*@}*/
+
+/*@}*/
+
+
+
+/* ----------------------------------------------------------------------- */
+
+#if defined(OPJ_BIG_ENDIAN)
+ #define opj_write_bytes opj_write_bytes_BE
+ #define opj_read_bytes opj_read_bytes_BE
+ #define opj_write_double opj_write_double_BE
+ #define opj_read_double opj_read_double_BE
+ #define opj_write_float opj_write_float_BE
+ #define opj_read_float opj_read_float_BE
+#else
+ #define opj_write_bytes opj_write_bytes_LE
+ #define opj_read_bytes opj_read_bytes_LE
+ #define opj_write_double opj_write_double_LE
+ #define opj_read_double opj_read_double_LE
+ #define opj_write_float opj_write_float_LE
+ #define opj_read_float opj_read_float_LE
+#endif
+
+
+
+typedef enum
+{
+ opj_signed_sentinel = -1, /* do not use in code */
+ opj_stream_e_output = 0x1,
+ opj_stream_e_input = 0x2,
+ opj_stream_e_end = 0x4,
+ opj_stream_e_error = 0x8
+}
+opj_stream_flag ;
+
+/**
+Byte input-output stream.
+*/
+typedef struct opj_stream_private
+{
+ /**
+ * User data, be it files, ... The actual data depends on the type of the stream.
+ */
+ void * m_user_data;
+
+ /**
+ * User data length
+ */
+ OPJ_UINT64 m_user_data_length;
+
+ /**
+ * Pointer to actual read function (NULL at the initialization of the cio.
+ */
+ opj_stream_read_fn m_read_fn;
+
+ /**
+ * Pointer to actual write function (NULL at the initialization of the cio.
+ */
+ opj_stream_write_fn m_write_fn;
+
+ /**
+ * Pointer to actual skip function (NULL at the initialization of the cio.
+ * There is no seek function to prevent from back and forth slow procedures.
+ */
+ opj_stream_skip_fn m_skip_fn;
+
+ /**
+ * Pointer to actual seek function (if available).
+ */
+ opj_stream_seek_fn m_seek_fn;
+
+
+
+
+ /**
+ * Actual data stored into the stream if readed from. Data is read by chunk of fixed size.
+ * you should never access this data directly.
+ */
+ OPJ_BYTE * m_stored_data;
+
+ /**
+ * Pointer to the current read data.
+ */
+ OPJ_BYTE * m_current_data;
+
+ OPJ_OFF_T (* m_opj_skip)(struct opj_stream_private * ,OPJ_OFF_T , struct opj_event_mgr *);
+
+ opj_bool (* m_opj_seek) (struct opj_stream_private * , OPJ_OFF_T , struct opj_event_mgr *);
+
+ /**
+ * number of bytes containing in the buffer.
+ */
+ OPJ_SIZE_T m_bytes_in_buffer;
+
+ /**
+ * The number of bytes read/written from the beginning of the stream
+ */
+ OPJ_OFF_T m_byte_offset;
+
+ /**
+ * The size of the buffer.
+ */
+ OPJ_SIZE_T m_buffer_size;
+
+ /**
+ * Flags to tell the status of the stream.
+ */
+ opj_stream_flag m_status;
+
+}
+opj_stream_private_t;
+
+
+/**
+ * Write some bytes to the given data buffer, this function is used in Big Endian cpus.
+ * @param p_buffer pointer the data buffer to write data to.
+ * @param p_value the value to write
+ * @param p_nb_bytes the number of bytes to write
+*/
+void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes);
+
+/**
+ * Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
+ * @param p_buffer pointer the data buffer to read data from.
+ * @param p_value pointer to the value that will store the data.
+ * @param p_nb_bytes the nb bytes to read.
+ * @return the number of bytes read or -1 if an error occured.