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From ddf2a3a69486376897ae654c8f1f0aa8cbae6c24 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Mon, 4 Aug 2014 12:25:08 +0100
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Subject: [PATCH 1/2] loader: Add load_image_gzipped function.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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As the name suggests this lets you load a ROM/disk image that is
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gzipped. It is uncompressed before storing it in guest memory.
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Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
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Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
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---
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hw/core/loader.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
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include/hw/loader.h | 1 +
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2 files changed, 49 insertions(+)
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diff --git a/hw/core/loader.c b/hw/core/loader.c
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index 2bf6b8f..83136e8 100644
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--- a/hw/core/loader.c
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+++ b/hw/core/loader.c
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@@ -577,6 +577,54 @@ int load_ramdisk(const char *filename, hwaddr addr, uint64_t max_sz)
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return load_uboot_image(filename, NULL, &addr, NULL, IH_TYPE_RAMDISK);
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}
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+/* This simply prevents g_malloc in the function below from allocating
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+ * a huge amount of memory, by placing a limit on the maximum
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+ * uncompressed image size that load_image_gzipped will read.
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+ */
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+#define LOAD_IMAGE_MAX_GUNZIP_BYTES (256 << 20)
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+
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+/* Load a gzip-compressed kernel. */
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+int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz)
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+{
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+ uint8_t *compressed_data = NULL;
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+ uint8_t *data = NULL;
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+ gsize len;
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+ ssize_t bytes;
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+ int ret = -1;
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+
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+ if (!g_file_get_contents(filename, (char **) &compressed_data, &len,
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+ NULL)) {
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+ goto out;
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+ }
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+
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+ /* Is it a gzip-compressed file? */
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+ if (len < 2 ||
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+ compressed_data[0] != 0x1f ||
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+ compressed_data[1] != 0x8b ) {
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+ goto out;
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+ }
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+
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+ if (max_sz > LOAD_IMAGE_MAX_GUNZIP_BYTES) {
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+ max_sz = LOAD_IMAGE_MAX_GUNZIP_BYTES;
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+ }
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+
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+ data = g_malloc(max_sz);
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+ bytes = gunzip(data, max_sz, compressed_data, len);
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+ if (bytes < 0) {
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+ fprintf(stderr, "%s: unable to decompress gzipped kernel file\n",
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+ filename);
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+ goto out;
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+ }
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+
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+ rom_add_blob_fixed(filename, data, bytes, addr);
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+ ret = bytes;
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+
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+ out:
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+ g_free(compressed_data);
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+ g_free(data);
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+ return ret;
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+}
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+
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/*
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* Functions for reboot-persistent memory regions.
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* - used for vga bios and option roms.
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diff --git a/include/hw/loader.h b/include/hw/loader.h
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index 796cbf9..00c9117 100644
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--- a/include/hw/loader.h
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+++ b/include/hw/loader.h
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@@ -15,6 +15,7 @@ int get_image_size(const char *filename);
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int load_image(const char *filename, uint8_t *addr); /* deprecated */
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int load_image_targphys(const char *filename, hwaddr,
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uint64_t max_sz);
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+int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz);
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#define ELF_LOAD_FAILED -1
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#define ELF_LOAD_NOT_ELF -2
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--
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2.0.4
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