The Independent JPEG Group's JPEG software v3

1 files changed, 96 insertions, 0 deletions

diff --git a/jmemnobs.c b/jmemnobs.c
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+/*
+ * jmemnobs.c  (jmemsys.c)
+ *
+ * Copyright (C) 1992, 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 provides a really simple implementation of the system-
+ * dependent portion of the JPEG memory manager.  This implementation
+ * assumes that no backing-store files are needed: all required space
+ * can be obtained from malloc().
+ * This is very portable in the sense that it'll compile on almost anything,
+ * but you'd better have lots of main memory (or virtual memory) if you want
+ * to process big images.
+ * Note that the max_memory_to_use option is ignored by this implementation.
+ */
+
+#include "jinclude.h"
+#include "jmemsys.h"
+
+#ifdef INCLUDES_ARE_ANSI
+#include <stdlib.h>		/* to declare malloc(), free() */
+#else
+extern void * malloc PP((size_t size));
+extern void free PP((void *ptr));
+#endif
+
+
+static external_methods_ptr methods; /* saved for access to error_exit */
+
+
+/*
+ * Memory allocation and freeing are controlled by the regular library
+ * routines malloc() and free().
+ */
+
+GLOBAL void *
+jget_small (size_t sizeofobject)
+{
+  return (void *) malloc(sizeofobject);
+}
+
+GLOBAL void
+jfree_small (void * object)
+{
+  free(object);
+}
+
+/*
+ * We assume NEED_FAR_POINTERS is not defined and so the separate entry points
+ * jget_large, jfree_large are not needed.
+ */
+
+
+/*
+ * This routine computes the total memory space available for allocation.
+ * Here we always say, "we got all you want bud!"
+ */
+
+GLOBAL long
+jmem_available (long min_bytes_needed, long max_bytes_needed)
+{
+  return max_bytes_needed;
+}
+
+
+/*
+ * Backing store (temporary file) management.
+ * This should never be called and we just error out.
+ */
+
+GLOBAL void
+jopen_backing_store (backing_store_ptr info, long total_bytes_needed)
+{
+  ERREXIT(methods, "Backing store not supported");
+}
+
+
+/*
+ * These routines take care of any system-dependent initialization and
+ * cleanup required.  Keep in mind that jmem_term may be called more than
+ * once.
+ */
+
+GLOBAL void
+jmem_init (external_methods_ptr emethods)
+{
+  methods = emethods;		/* save struct addr for error exit access */
+  emethods->max_memory_to_use = 0;
+}
+
+GLOBAL void
+jmem_term (void)
+{
+  /* no work */
+}