--- /dev/null
+/*
+ * Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
+ * Contributed by Alex Williamson <alex.williamson@hp.com>
+ *
+ * Copyright (C) 2001-2003 Hewlett-Packard Co.
+ * Contributed by Stephane Eranian <eranian@hpl.hp.com>
+ *
+ * Copyright (C) 2001 Silicon Graphics, Inc.
+ * Contributed by Brent Casavant <bcasavan@sgi.com>
+ *
+ * This file is part of the ELILO, the EFI Linux boot loader.
+ *
+ * ELILO is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * ELILO is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ELILO; see the file COPYING. If not, write to the Free
+ * Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * Please check out the elilo.txt for complete documentation on how
+ * to use this program.
+ */
+
+#include <efi.h>
+#include <efilib.h>
+
+#include "elilo.h"
+
+#include "gzip.h"
+
+#define LD_NAME L"gunzip"
+
+#define memzero(s, n) Memset((VOID *)(s), 0, (n))
+#define memcpy(a,b,n) Memcpy((VOID *)(a),(b),(n))
+
+/* size of output buffer */
+#define WSIZE 0x8000 /* Window size must be at least 32k, */
+ /* and a power of two */
+/*
+ * gzip declarations
+ */
+#define OF(args) args
+#define FUNC_STATIC static
+
+typedef unsigned char uch;
+typedef unsigned short ush;
+typedef unsigned long ulg;
+
+/*
+ * static parameters to gzip helper functions
+ * we cannot use paramters because API was not
+ * designed that way
+ */
+static uch *inbuf; /* input buffer (compressed data) */
+static uch *window; /* output buffer (uncompressed data) */
+
+static VOID *outbuf;
+unsigned char *outptr;
+static unsigned long outsize;
+
+static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
+static unsigned outcnt = 0; /* bytes in output buffer */
+
+#define get_byte() inbuf[inptr++]
+
+/* Diagnostic functions */
+#ifdef INFLATE_DEBUG
+# define Assert(cond,msg) {if(!(cond)) error(msg);}
+int stderr;
+# define Trace(x) Print(L"line %d:\n", __LINE__);
+# define Tracev(x) {if (verbose) Print(L"line %d:\n", __LINE__) ;}
+# define Tracevv(x) {if (verbose>1) Print(L"line %d:\n", __LINE__) ;}
+# define Tracec(c,x) {if (verbose && (c)) Print(L"line %d:\n", __LINE__) ;}
+# define Tracecv(c,x) {if (verbose>1 && (c)) Print(L"line %d:\n", __LINE__) ;}
+#else
+# define Assert(cond,msg)
+# define Trace(x)
+# define Tracev(x)
+# define Tracevv(x)
+# define Tracec(c,x)
+# define Tracecv(c,x)
+#endif
+
+static void flush_window(void);
+static void error(char *m);
+static long bytes_out;
+
+static void error(char *m);
+
+#define gzip_malloc(size) (void *)alloc(size, 0)
+#define gzip_free(where) free(where)
+
+#include "inflate.c"
+
+/*
+ * Run a set of bytes through the crc shift register. If s is a NULL
+ * pointer, then initialize the crc shift register contents instead.
+ * Return the current crc in either case.
+ *
+ * Input:
+ * S pointer to bytes to pump through.
+ * N number of bytes in S[].
+ */
+static void
+updcrc(unsigned char *s, unsigned n)
+{
+ register unsigned long c;
+ /* crc is defined in inflate.c */
+
+ c = crc;
+ while (n--) {
+ c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
+ }
+ crc = c;
+ return;
+}
+
+/*
+ * Clear input and output buffers
+ */
+static void
+clear_bufs(void)
+{
+ outcnt = 0;
+ inptr = 0;
+}
+
+/*
+ * Write the output window window[0..outcnt-1] holding uncompressed
+ * data and update crc.
+ */
+void
+flush_window(void)
+{
+ /*
+ * We'll end up relying on the CRC check and size check failing
+ * if there's actually more data than we expect.
+ */
+ if (!outcnt || bytes_out + outcnt > outsize)
+ return;
+
+ updcrc(window, outcnt);
+
+ Memcpy(outptr, window, outcnt);
+ outptr += outcnt;
+ bytes_out += outcnt;
+
+ outcnt = 0;
+}
+
+static void
+error(char *x)
+{
+ ERR_PRT((L"%s : %a", LD_NAME, x));
+ /* will eventually exit with error from gunzip() */
+}
+
+static INT32
+decompress(VOID)
+{
+ INT32 ret;
+
+ clear_bufs();
+ makecrc();
+ Print(L"Uncompressing... ");
+ ret = gunzip();
+ if (ret == 0) Print(L"done\n");
+ return ret == 0 ? 0 : -1;
+}
+
+int
+gunzip_image(memdesc_t *image)
+{
+ UINTN pgcnt;
+
+ inbuf = image->start_addr;
+
+ /*
+ * Last 4 bytes of gzip'd image indicates the uncompressed size
+ */
+ outsize = inbuf[image->size - 1] << 24 | inbuf[image->size - 2] << 16 |
+ inbuf[image->size - 3] << 8 | inbuf[image->size - 4];
+
+ pgcnt = EFI_SIZE_TO_PAGES(outsize);
+
+ outbuf = alloc_pages(pgcnt, EfiLoaderData, AllocateAnyPages, 0);
+ if (outbuf == NULL) {
+ ERR_PRT((L"%s : allocate output buffer failed\n", LD_NAME));
+ return -1;
+ }
+ outptr = outbuf;
+
+ window = (void *)alloc(WSIZE, 0);
+ if (window == NULL) {
+ ERR_PRT((L"%s : allocate output window failed\n", LD_NAME));
+ free(outbuf);
+ return -1;
+ }
+
+ bytes_out = 0;
+
+ if (decompress() != 0) {
+ free(window);
+ free(outbuf);
+ return ELILO_LOAD_ERROR;
+ }
+
+ free(window);
+ free(image->start_addr);
+
+ image->start_addr = outbuf;
+ image->size = outsize;
+ image->pgcnt = pgcnt;
+
+ return ELILO_LOAD_SUCCESS;
+}
projects / debian / elilo / blobdiff