[syslinux:master] com32/chain: modify lba2chs() towards using disk_chs type

[syslinux-bot for Michal Soltys]

Commit-ID:  4bcdb24bdb463e8b5cdf5d54a950b5e82776874b
Gitweb:     http://www.syslinux.org/commit/4bcdb24bdb463e8b5cdf5d54a950b5e82776874b
Author:     Michal Soltys <soltys at ziu.info>
AuthorDate: Wed, 9 Mar 2011 00:15:36 +0100
Committer:  Michal Soltys <soltys at ziu.info>
CommitDate: Wed, 9 Mar 2011 00:15:36 +0100

com32/chain: modify lba2chs() towards using disk_chs type

Signed-off-by: Michal Soltys <soltys at ziu.info>

---
 com32/chain/chain.c   |   12 ++++++------
 com32/chain/mangle.c  |    9 ++-------
 com32/chain/utility.c |    6 ++++--
 com32/chain/utility.h |    2 +-
 4 files changed, 13 insertions(+), 16 deletions(-)

diff --git a/com32/chain/chain.c b/com32/chain/chain.c
index 2fe65c0..6a028a4 100644
--- a/com32/chain/chain.c
+++ b/com32/chain/chain.c
@@ -416,8 +416,8 @@ static int setup_handover(const struct part_iter *iter,
 	len = ~0u;
 	if (iter->di.lbacnt < len)
 	    len = (uint32_t)iter->di.lbacnt;
-	*(uint32_t *)ha->start = lba2chs(&iter->di, 0, l2c_cadd);
-	*(uint32_t *)ha->end = lba2chs(&iter->di, len - 1, l2c_cadd);
+	lba2chs(&ha->start, &iter->di, 0, l2c_cadd);
+	lba2chs(&ha->end, &iter->di, len - 1, l2c_cadd);
 	ha->active_flag = 0x80;
 	ha->ostype = 0xDA;	/* "Non-FS Data", anything is good here though ... */
 	ha->start_lba = 0;
@@ -435,8 +435,8 @@ static int setup_handover(const struct part_iter *iter,
 	    error("Could not build GPT hand-over record!\n");
 	    goto bail;
 	}
-	*(uint32_t *)ha->start = lba2chs(&iter->di, gp->lba_first, l2c_cadd);
-	*(uint32_t *)ha->end = lba2chs(&iter->di, gp->lba_last, l2c_cadd);
+	lba2chs(&ha->start, &iter->di, gp->lba_first, l2c_cadd);
+	lba2chs(&ha->end, &iter->di, gp->lba_last, l2c_cadd);
 	ha->active_flag = 0x80;
 	ha->ostype = 0xED;
 	/* All bits set by default */
@@ -467,8 +467,8 @@ static int setup_handover(const struct part_iter *iter,
 	    error("Could not build MBR hand-over record!\n");
 	    goto bail;
 	}
-	*(uint32_t *)ha->start = lba2chs(&iter->di, iter->start_lba, l2c_cadd);
-	*(uint32_t *)ha->end = lba2chs(&iter->di, iter->start_lba + dp->length - 1, l2c_cadd);
+	lba2chs(&ha->start, &iter->di, iter->start_lba, l2c_cadd);
+	lba2chs(&ha->end, &iter->di, iter->start_lba + dp->length - 1, l2c_cadd);
 	ha->active_flag = dp->active_flag;
 	ha->ostype = dp->ostype;
 	ha->start_lba = (uint32_t)iter->start_lba;  /* fine, we iterate over legacy scheme */
diff --git a/com32/chain/mangle.c b/com32/chain/mangle.c
index 1525047..5d4e718 100644
--- a/com32/chain/mangle.c
+++ b/com32/chain/mangle.c
@@ -554,13 +554,8 @@ static int mpe_setchs(const struct disk_info *di,
     ochs1 = *(uint32_t *)dp->start;
     ochs2 = *(uint32_t *)dp->end;
 
-    *(uint32_t *)dp->start =
-	lba2chs(di, lba1, l2c_cadd) |
-	(*(uint32_t *)dp->start & 0xFF000000);
-
-    *(uint32_t *)dp->end =
-	lba2chs(di, lba1 + dp->length - 1, l2c_cadd) |
-	(*(uint32_t *)dp->end & 0xFF000000);
+    lba2chs(&dp->start, di, lba1, l2c_cadd);
+    lba2chs(&dp->end, di, lba1 + dp->length - 1, l2c_cadd);
 
     return
 	*(uint32_t *)dp->start != ochs1 ||
diff --git a/com32/chain/utility.c b/com32/chain/utility.c
index f0bfd8f..fb59551 100644
--- a/com32/chain/utility.c
+++ b/com32/chain/utility.c
@@ -46,7 +46,7 @@ void wait_key(void)
     } while (!cnt || (cnt < 0 && errno == EAGAIN));
 }
 
-uint32_t lba2chs(const struct disk_info *di, uint64_t lba, uint32_t mode)
+void lba2chs(disk_chs *dst, const struct disk_info *di, uint64_t lba, uint32_t mode)
 {
     uint32_t c, h, s, t;
     uint32_t cs, hs, ss;
@@ -86,7 +86,9 @@ uint32_t lba2chs(const struct disk_info *di, uint64_t lba, uint32_t mode)
 	c = t / hs;
     }
 
-    return h | (s << 8) | ((c & 0x300) << 6) | ((c & 0xFF) << 16);
+    (*dst)[0] = h;
+    (*dst)[1] = s | ((c & 0x300) >> 2);
+    (*dst)[2] = c;
 }
 
 uint32_t get_file_lba(const char *filename)
diff --git a/com32/chain/utility.h b/com32/chain/utility.h
index 9a40bc6..8a08be7 100644
--- a/com32/chain/utility.h
+++ b/com32/chain/utility.h
@@ -20,7 +20,7 @@
 void error(const char *msg);
 int guid_is0(const struct guid *guid);
 void wait_key(void);
-uint32_t lba2chs(const struct disk_info *di, uint64_t lba, uint32_t mode);
+void lba2chs(disk_chs *dst, const struct disk_info *di, uint64_t lba, uint32_t mode);
 uint32_t get_file_lba(const char *filename);
 int drvoff_detect(int type, unsigned int *off);
 int bpb_detect(const uint8_t *bpb, const char *tag);