aboutsummaryrefslogtreecommitdiffstats
path: root/code/jpeg-6/jcomapi.c
diff options
context:
space:
mode:
Diffstat (limited to 'code/jpeg-6/jcomapi.c')
-rwxr-xr-xcode/jpeg-6/jcomapi.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/code/jpeg-6/jcomapi.c b/code/jpeg-6/jcomapi.c
new file mode 100755
index 0000000..8f417c0
--- /dev/null
+++ b/code/jpeg-6/jcomapi.c
@@ -0,0 +1,94 @@
+/*
+ * jcomapi.c
+ *
+ * Copyright (C) 1994, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains application interface routines that are used for both
+ * compression and decompression.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/*
+ * Abort processing of a JPEG compression or decompression operation,
+ * but don't destroy the object itself.
+ *
+ * For this, we merely clean up all the nonpermanent memory pools.
+ * Note that temp files (virtual arrays) are not allowed to belong to
+ * the permanent pool, so we will be able to close all temp files here.
+ * Closing a data source or destination, if necessary, is the application's
+ * responsibility.
+ */
+
+GLOBAL void
+jpeg_abort (j_common_ptr cinfo)
+{
+ int pool;
+
+ /* Releasing pools in reverse order might help avoid fragmentation
+ * with some (brain-damaged) malloc libraries.
+ */
+ for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
+ (*cinfo->mem->free_pool) (cinfo, pool);
+ }
+
+ /* Reset overall state for possible reuse of object */
+ cinfo->global_state = (cinfo->is_decompressor ? DSTATE_START : CSTATE_START);
+}
+
+
+/*
+ * Destruction of a JPEG object.
+ *
+ * Everything gets deallocated except the master jpeg_compress_struct itself
+ * and the error manager struct. Both of these are supplied by the application
+ * and must be freed, if necessary, by the application. (Often they are on
+ * the stack and so don't need to be freed anyway.)
+ * Closing a data source or destination, if necessary, is the application's
+ * responsibility.
+ */
+
+GLOBAL void
+jpeg_destroy (j_common_ptr cinfo)
+{
+ /* We need only tell the memory manager to release everything. */
+ /* NB: mem pointer is NULL if memory mgr failed to initialize. */
+ if (cinfo->mem != NULL)
+ (*cinfo->mem->self_destruct) (cinfo);
+ cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */
+ cinfo->global_state = 0; /* mark it destroyed */
+}
+
+
+/*
+ * Convenience routines for allocating quantization and Huffman tables.
+ * (Would jutils.c be a more reasonable place to put these?)
+ */
+
+GLOBAL JQUANT_TBL *
+jpeg_alloc_quant_table (j_common_ptr cinfo)
+{
+ JQUANT_TBL *tbl;
+
+ tbl = (JQUANT_TBL *)
+ (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
+ tbl->sent_table = FALSE; /* make sure this is false in any new table */
+ return tbl;
+}
+
+
+GLOBAL JHUFF_TBL *
+jpeg_alloc_huff_table (j_common_ptr cinfo)
+{
+ JHUFF_TBL *tbl;
+
+ tbl = (JHUFF_TBL *)
+ (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
+ tbl->sent_table = FALSE; /* make sure this is false in any new table */
+ return tbl;
+}