/*
- * Copyright (c) 2001-2002, David Janssens
+ * Copyright (c) 2001-2003, David Janssens
+ * Copyright (c) 2002-2003, Yannick Verschueren
+ * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
+ * Copyright (c) 2005, Herv� Drolon, FreeImage Team
+ * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* POSSIBILITY OF SUCH DAMAGE.
*/
-#include "cio.h"
-#include <setjmp.h>
+#include "opj_includes.h"
-static unsigned char *cio_start; /* pointer to the start of the stream */
-static unsigned char *cio_end; /* pointer to the end of the stream */
-static unsigned char *cio_bp; /* pointer to the present position */
+/* ----------------------------------------------------------------------- */
-extern jmp_buf j2k_error;
+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 = cp->tdx * cp->tdy * cp->tw * cp->th * 4;
+ cio->buffer = (unsigned char *)opj_malloc(cio->length);
+ if(!cio->buffer) {
+ opj_free(cio);
+ return NULL;
+ }
+ }
+ else {
+ opj_free(cio);
+ return NULL;
+ }
-/*
- * Number of bytes written.
- */
-int cio_numbytes()
-{
- return cio_bp - cio_start;
+ /* 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.
*/
-int cio_tell()
-{
- return cio_bp - cio_start;
+int cio_tell(opj_cio_t *cio) {
+ return cio->bp - cio->start;
}
/*
*
* pos : position, in number of bytes, from the beginning of the stream
*/
-void cio_seek(int pos)
-{
- cio_bp = cio_start + pos;
+void cio_seek(opj_cio_t *cio, int pos) {
+ cio->bp = cio->start + pos;
}
/*
* Number of bytes left before the end of the stream.
*/
-int cio_numbytesleft()
-{
- return cio_end - cio_bp;
+int cio_numbytesleft(opj_cio_t *cio) {
+ return cio->end - cio->bp;
}
/*
* Get pointer to the current position in the stream.
*/
-unsigned char *cio_getbp()
-{
- return cio_bp;
-}
-
-/*
- * Initialize byte IO
- *
- * bp : destination/source stream
- * len : length of the stream
- */
-void cio_init(unsigned char *bp, int len)
-{
- cio_start = bp;
- cio_end = bp + len;
- cio_bp = bp;
+unsigned char *cio_getbp(opj_cio_t *cio) {
+ return cio->bp;
}
/*
* Write a byte.
*/
-void cio_byteout(unsigned char v)
-{
- if (cio_bp >= cio_end)
- longjmp(j2k_error, 1);
- *cio_bp++ = v;
-
+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 false;
+ }
+ *cio->bp++ = v;
+ return true;
}
/*
* Read a byte.
*/
-unsigned char cio_bytein()
-{
- if (cio_bp >= cio_end)
- longjmp(j2k_error, 1);
- return *cio_bp++;
+unsigned char cio_bytein(opj_cio_t *cio) {
+ if (cio->bp >= cio->end) {
+ opj_event_msg(cio->cinfo, EVT_ERROR, "read error\n");
+ return 0;
+ }
+ return *cio->bp++;
}
/*
* v : value to write
* n : number of bytes to write
*/
-void cio_write(unsigned int v, int n)
-{
- int i;
- for (i = n - 1; i >= 0; i--) {
- cio_byteout((unsigned char) ((v >> (i << 3)) & 0xff));
- }
+unsigned int cio_write(opj_cio_t *cio, unsigned 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;
+ }
+ return n;
}
/*
*
* return : value of the n bytes read
*/
-unsigned int cio_read(int n)
-{
- int i;
- unsigned int v;
- v = 0;
- for (i = n - 1; i >= 0; i--) {
- v += cio_bytein() << (i << 3);
- }
- return v;
+unsigned int cio_read(opj_cio_t *cio, int n) {
+ int i;
+ unsigned int v;
+ v = 0;
+ for (i = n - 1; i >= 0; i--) {
+ v += cio_bytein(cio) << (i << 3);
+ }
+ return v;
}
/*
*
* n : number of bytes to skip
*/
-void cio_skip(int n)
-{
- cio_bp += n;
+void cio_skip(opj_cio_t *cio, int n) {
+ cio->bp += n;
}
+
+
+
projects / openjpeg.git / blobdiff