1 files changed, 137 insertions, 0 deletions
diff --git a/libmiav/jpeg_mem_dest.cc b/libmiav/jpeg_mem_dest.cc
new file mode 100644
index 0000000..439c9a8
--- /dev/null
+++ b/libmiav/jpeg_mem_dest.cc
@@ -0,0 +1,137 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            jpeg_mem_dest.cc
+ *
+ *  Thu Jul 28 16:40:08 CEST 2005
+ *  Copyright  2005 Bent Bisballe
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of MIaV.
+ *
+ *  MIaV is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  MIaV is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with MIaV; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include <config.h>
+#include "jpeg_mem_dest.h"
+
+#define OUTPUT_BUF_SIZE  4096	/* choose an efficiently ?? size */
+
+/* Expanded data destination object for stdio output */
+typedef struct {
+  struct jpeg_destination_mgr pub; /* public fields */
+
+  JOCTET * outbuff;		/* target buffer */
+  size_t * size;
+} mem_destination_mgr;
+
+typedef mem_destination_mgr * mem_dest_ptr;
+
+/*
+ * Initialize destination --- called by jpeg_start_compress
+ * before any data is actually written.
+ */
+void init_destination (j_compress_ptr cinfo)
+{
+  mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
+
+  *dest->size = 0;
+  dest->pub.next_output_byte = dest->outbuff;
+  dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
+}
+
+/*
+ * Terminate destination --- called by jpeg_finish_compress
+ * after all data has been written.  Usually needs to flush buffer.
+ *
+ * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
+ * application must deal with any cleanup that should happen even
+ * for error exit.
+ */
+void term_destination (j_compress_ptr cinfo)
+{
+  mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
+  size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
+
+  /* Write any data remaining in the buffer */
+  if (datacount > 0) {
+    dest->outbuff+=datacount;
+    *dest->size+=datacount;
+  }
+}
+
+/*
+ * Empty the output buffer --- called whenever buffer fills up.
+ *
+ * In typical applications, this should write the entire output buffer
+ * (ignoring the current state of next_output_byte & free_in_buffer),
+ * reset the pointer & count to the start of the buffer, and return TRUE
+ * indicating that the buffer has been dumped.
+ *
+ * In applications that need to be able to suspend compression due to output
+ * overrun, a FALSE return indicates that the buffer cannot be emptied now.
+ * In this situation, the compressor will return to its caller (possibly with
+ * an indication that it has not accepted all the supplied scanlines).  The
+ * application should resume compression after it has made more room in the
+ * output buffer.  Note that there are substantial restrictions on the use of
+ * suspension --- see the documentation.
+ *
+ * When suspending, the compressor will back up to a convenient restart point
+ * (typically the start of the current MCU). next_output_byte & free_in_buffer
+ * indicate where the restart point will be if the current call returns FALSE.
+ * Data beyond this point will be regenerated after resumption, so do not
+ * write it out when emptying the buffer externally.
+ */
+boolean empty_output_buffer (j_compress_ptr cinfo)
+{
+  mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
+
+  dest->outbuff+=OUTPUT_BUF_SIZE;
+  *dest->size+=OUTPUT_BUF_SIZE;
+
+  dest->pub.next_output_byte = dest->outbuff;
+  dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
+
+  return TRUE;
+}
+
+/*
+ * Prepare for output to a memory buffer.
+ . The caller must have already allocated the buffer, and is responsible
+ * for closing it after finishing compression.
+ */
+void jpeg_mem_dest (j_compress_ptr cinfo, char * outbuff, size_t * size)
+{
+  mem_dest_ptr dest;
+
+  /* The destination object is made permanent so that multiple JPEG images
+   * can be written to the same file without re-executing jpeg_stdio_dest.
+   * This makes it dangerous to use this manager and a different destination
+   * manager serially with the same JPEG object, because their private object
+   * sizes may be different.  Caveat programmer.
+   */
+  if (cinfo->dest == NULL) {	/* first time for this JPEG object? */
+    cinfo->dest = (struct jpeg_destination_mgr *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+				  sizeof(mem_destination_mgr));
+  }
+
+  dest = (mem_dest_ptr) cinfo->dest;
+  dest->pub.init_destination = init_destination;
+  dest->pub.empty_output_buffer = empty_output_buffer;
+  dest->pub.term_destination = term_destination;
+  dest->outbuff = (JOCTET *)outbuff;
+  dest->size = (size_t *)size;
+}