+/*
+ * Allocate and decompress a BMP image using gunzip().
+ *
+ * Returns a pointer to the decompressed image data. Must be freed by
+ * the caller after use.
+ *
+ * Returns NULL if decompression failed, or if the decompressed data
+ * didn't contain a valid BMP signature.
+ */
+#ifdef CONFIG_VIDEO_BMP_GZIP
+static bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp)
+{
+ void *dst;
+ unsigned long len;
+ bmp_image_t *bmp;
+
+ /*
+ * Decompress bmp image
+ */
+ len = CFG_VIDEO_LOGO_MAX_SIZE;
+ dst = malloc(CFG_VIDEO_LOGO_MAX_SIZE);
+ if (dst == NULL) {
+ puts("Error: malloc in gunzip failed!\n");
+ return NULL;
+ }
+ if (gunzip(dst, CFG_VIDEO_LOGO_MAX_SIZE, (uchar *)addr, &len) != 0) {
+ free(dst);
+ return NULL;
+ }
+ if (len == CFG_VIDEO_LOGO_MAX_SIZE)
+ puts("Image could be truncated"
+ " (increase CFG_VIDEO_LOGO_MAX_SIZE)!\n");
+
+ bmp = dst;
+
+ /*
+ * Check for bmp mark 'BM'
+ */
+ if (!((bmp->header.signature[0] == 'B') &&
+ (bmp->header.signature[1] == 'M'))) {
+ free(dst);
+ return NULL;
+ }
+
+ puts("Gzipped BMP image detected!\n");
+
+ return bmp;
+}
+#else
+static bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp)
+{
+ return NULL;
+}
+#endif
+
+