diff --git a/src/lib/openjp2/cio.c b/src/lib/openjp2/cio.c
index 553809cc..51f65266 100644
--- a/src/lib/openjp2/cio.c
+++ b/src/lib/openjp2/cio.c
@@ -33,162 +33,6 @@
 
 /* ----------------------------------------------------------------------- */
 
-opj_cio_t* opj_cio_open(opj_common_ptr cinfo, unsigned char *buffer, int length) {
-	opj_cp_t *cp = NULL;
-	opj_cio_t *cio = (opj_cio_t*)opj_malloc(sizeof(opj_cio_t));
-	if(!cio) return NULL;
-	cio->cinfo = cinfo;
-	if(buffer && length) {
-		/* wrap a user buffer containing the encoded image */
-		cio->openmode = OPJ_STREAM_READ;
-		cio->buffer = buffer;
-		cio->length = length;
-	}
-	else if(!buffer && !length && cinfo) {
-		/* allocate a buffer for the encoded image */
-		cio->openmode = OPJ_STREAM_WRITE;
-		switch(cinfo->codec_format) {
-			case CODEC_J2K:
-				cp = ((opj_j2k_t*)cinfo->j2k_handle)->cp;
-				break;
-			case CODEC_JP2:
-				cp = ((opj_jp2_t*)cinfo->jp2_handle)->j2k->cp;
-				break;
-			default:
-				opj_free(cio);
-				return NULL;
-		}
-		cio->length = (int) (0.1625 * cp->img_size + 2000); /* 0.1625 = 1.3/8 and 2000 bytes as a minimum for headers */
-		assert(cio->length >= 0);
-		cio->buffer = (unsigned char *)opj_malloc((OPJ_SIZE_T)cio->length);
-		if(!cio->buffer) {
-			opj_event_msg(cio->cinfo, EVT_ERROR, "Error allocating memory for compressed bitstream\n");
-			opj_free(cio);
-			return NULL;
-		}
-	}
-	else {
-		opj_free(cio);
-		return NULL;
-	}
-
-	/* Initialize byte IO */
-	cio->start = cio->buffer;
-	cio->end = cio->buffer + cio->length;
-	cio->bp = cio->buffer;
-
-	return cio;
-}
-
-void opj_cio_close(opj_cio_t *cio) {
-	if(cio) {
-		if(cio->openmode == OPJ_STREAM_WRITE) {
-			/* destroy the allocated buffer */
-			opj_free(cio->buffer);
-		}
-		/* destroy the cio */
-		opj_free(cio);
-	}
-}
-
-/* ----------------------------------------------------------------------- */
-
-/*
- * Get position in byte stream.
- */
-OPJ_OFF_T cio_tell(opj_cio_t *cio) {
-	return cio->bp - cio->start;
-}
-
-/*
- * Set position in byte stream.
- *
- * pos : position, in number of bytes, from the beginning of the stream
- */
-void cio_seek(opj_cio_t *cio, int pos) {
-	cio->bp = cio->start + pos;
-}
-
-/*
- * Number of bytes left before the end of the stream.
- */
-OPJ_SIZE_T cio_numbytesleft(opj_cio_t *cio) {
-	const ptrdiff_t diff = cio->end - cio->bp;
-  assert( diff >= 0 );
-  return (OPJ_SIZE_T)diff;
-}
-
-/*
- * Get pointer to the current position in the stream.
- */
-unsigned char *cio_getbp(opj_cio_t *cio) {
-	return cio->bp;
-}
-
-/*
- * Write a byte.
- */
-opj_bool cio_byteout(opj_cio_t *cio, unsigned char v) {
-	if (cio->bp >= cio->end) {
-		opj_event_msg(cio->cinfo, EVT_ERROR, "write error\n");
-		return OPJ_FALSE;
-	}
-	*cio->bp++ = v;
-	return OPJ_TRUE;
-}
-
-/*
- * Read a byte.
- */
-unsigned char cio_bytein(opj_cio_t *cio) {
-	if (cio->bp >= cio->end) {
-		opj_event_msg(cio->cinfo, EVT_ERROR, "read error: passed the end of the codestream (start = %d, current = %d, end = %d\n", cio->start, cio->bp, cio->end);
-		return 0;
-	}
-	return *cio->bp++;
-}
-
-/*
- * Write some bytes.
- *
- * v : value to write
- * n : number of bytes to write
- */
-unsigned int cio_write(opj_cio_t *cio, unsigned long long int v, int n) {
-	int i;
-	for (i = n - 1; i >= 0; i--) {
-		if( !cio_byteout(cio, (unsigned char) ((v >> (i << 3)) & 0xff)) )
-			return 0;
-	}
-  assert( n >= 0 );
-	return (unsigned int)n;
-}
-
-/*
- * Read some bytes.
- *
- * n : number of bytes to read
- *
- * return : value of the n bytes read
- */
-unsigned int cio_read(opj_cio_t *cio, int n) {
-	int i;
-	unsigned int v = 0;
-	for (i = n - 1; i >= 0; i--) {
-    const unsigned int c = cio_bytein(cio);
-		v += c << (i << 3);
-	}
-	return v;
-}
-
-/* 
- * Skip some bytes.
- *
- * n : number of bytes to skip
- */
-void cio_skip(opj_cio_t *cio, int n) {
-	cio->bp += n;
-}
 
 /* ----------------------------------------------------------------------- */
 
diff --git a/src/lib/openjp2/cio.h b/src/lib/openjp2/cio.h
index 87b750f6..32ab4da4 100644
--- a/src/lib/openjp2/cio.h
+++ b/src/lib/openjp2/cio.h
@@ -46,45 +46,6 @@ The functions in CIO.C have for goal to realize a byte input / output process.
 /** @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
-*/
-DEPRECATED(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
-*/
-DEPRECATED(unsigned int cio_read(opj_cio_t *cio, int n));
-/**
-Skip some bytes
-@param cio CIO handle
-@param n Number of bytes to skip
-*/
-DEPRECATED(void cio_skip(opj_cio_t *cio, int n));
 /* ----------------------------------------------------------------------- */
 /*@}*/