loader: Add load_image_gzipped function.
As the name suggests this lets you load a ROM/disk image that is gzipped. It is uncompressed before storing it in guest memory. Signed-off-by: Richard W.M. Jones <rjones@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 1407831259-2115-2-git-send-email-rjones@redhat.com [PMM: removed stray space before ')'] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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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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return load_uboot_image(filename, NULL, &addr, NULL, IH_TYPE_RAMDISK);
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}
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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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/* 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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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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/* 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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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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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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rom_add_blob_fixed(filename, data, bytes, addr);
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ret = bytes;
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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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* Functions for reboot-persistent memory regions.
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* - used for vga bios and option roms.
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* - used for vga bios and option roms.
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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(const char *filename, uint8_t *addr); /* deprecated */
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int load_image_targphys(const char *filename, hwaddr,
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int load_image_targphys(const char *filename, hwaddr,
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uint64_t max_sz);
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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_FAILED -1
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#define ELF_LOAD_NOT_ELF -2
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#define ELF_LOAD_NOT_ELF -2
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