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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/efi.h>
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#include <linux/zlib.h>
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#include <asm/efi.h>
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#include "efistub.h"
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#include "inftrees.c"
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#include "inffast.c"
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#include "inflate.c"
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extern unsigned char _gzdata_start[], _gzdata_end[];
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extern u32 __aligned(1) payload_size;
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static struct z_stream_s stream;
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efi_status_t efi_zboot_decompress_init(unsigned long *alloc_size)
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{
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efi_status_t status;
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int rc;
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/* skip the 10 byte header, assume no recorded filename */
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stream.next_in = _gzdata_start + 10;
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stream.avail_in = _gzdata_end - stream.next_in;
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status = efi_allocate_pages(zlib_inflate_workspacesize(),
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(unsigned long *)&stream.workspace,
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ULONG_MAX);
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if (status != EFI_SUCCESS)
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return status;
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rc = zlib_inflateInit2(&stream, -MAX_WBITS);
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if (rc != Z_OK) {
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efi_err("failed to initialize GZIP decompressor: %d\n", rc);
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status = EFI_LOAD_ERROR;
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goto out;
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}
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*alloc_size = payload_size;
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return EFI_SUCCESS;
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out:
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efi_free(zlib_inflate_workspacesize(), (unsigned long)stream.workspace);
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return status;
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}
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efi_status_t efi_zboot_decompress(u8 *out, unsigned long outlen)
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{
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int rc;
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stream.next_out = out;
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stream.avail_out = outlen;
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rc = zlib_inflate(&stream, 0);
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zlib_inflateEnd(&stream);
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efi_free(zlib_inflate_workspacesize(), (unsigned long)stream.workspace);
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if (rc != Z_STREAM_END) {
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efi_err("GZIP decompression failed with status %d\n", rc);
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return EFI_LOAD_ERROR;
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}
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efi_cache_sync_image((unsigned long)out, outlen);
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return EFI_SUCCESS;
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}
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