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