1 files changed, 50 insertions, 0 deletions

diff --git a/apps/plugins/imageviewer/jpegp/mempool.c b/apps/plugins/imageviewer/jpegp/mempool.c
new file mode 100644
index 0000000000..f777ff230a
--- /dev/null
+++ b/apps/plugins/imageviewer/jpegp/mempool.c
@@ -0,0 +1,50 @@
+#include <inttypes.h>
+#include "plugin.h"
+
+static unsigned char *mem_pool;
+static unsigned char *mem_pool_start;
+static size_t memory_size;
+
+extern void *malloc(size_t size)
+{
+    if (size > memory_size)
+        return NULL;
+
+    memory_size -= size;
+    unsigned char* ptr = mem_pool;
+
+    mem_pool+= size;
+    return ptr;
+}
+
+extern void *calloc(size_t nelem, size_t elem_size)
+{
+    unsigned char* ptr = malloc(nelem*elem_size);
+    if (!ptr)
+        return  NULL;
+    rb->memset(ptr, 0, nelem*elem_size);
+    return ptr;
+}
+
+extern void init_mem_pool(const unsigned char *buf, const ssize_t buf_size)
+{
+    //TODO: do we need this alignment? (copied from gif lib)
+    unsigned char *memory_max;
+
+    /* align buffer */
+    mem_pool_start = mem_pool = (unsigned char *)((intptr_t)(buf + 3) & ~3);
+    memory_max = (unsigned char *)((intptr_t)(mem_pool + buf_size) & ~3);
+    memory_size = memory_max - mem_pool;
+}
+
+extern ssize_t freeze_mem_pool(void)
+{
+    mem_pool_start = mem_pool;
+    return memory_size;
+}
+
+extern void clear_mem_pool(void)
+{
+    memory_size += mem_pool - mem_pool_start;
+    mem_pool = mem_pool_start;
+}
\ No newline at end of file