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160 lines
5.3 KiB
160 lines
5.3 KiB
From e58b870ff926415e23fc386af41ff81b2f588763 Mon Sep 17 00:00:00 2001
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From: Maxim Suhanov <dfirblog@gmail.com>
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Date: Mon, 28 Aug 2023 16:40:07 +0300
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Subject: [PATCH 6/6] fs/ntfs: Make code more readable
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Move some calls used to access NTFS attribute header fields into
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functions with human-readable names.
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Suggested-by: Daniel Kiper <daniel.kiper@oracle.com>
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Signed-off-by: Maxim Suhanov <dfirblog@gmail.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/fs/ntfs.c | 48 +++++++++++++++++++++++++++++++--------------
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1 file changed, 33 insertions(+), 15 deletions(-)
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diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c
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index ff5e3740f0dd..de435aa14d85 100644
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--- a/grub-core/fs/ntfs.c
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+++ b/grub-core/fs/ntfs.c
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@@ -52,6 +52,24 @@ u64at (void *ptr, grub_size_t ofs)
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return grub_le_to_cpu64 (grub_get_unaligned64 ((char *) ptr + ofs));
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}
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+static grub_uint16_t
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+first_attr_off (void *mft_buf_ptr)
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+{
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+ return u16at (mft_buf_ptr, 0x14);
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+}
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+
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+static grub_uint16_t
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+res_attr_data_off (void *res_attr_ptr)
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+{
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+ return u16at (res_attr_ptr, 0x14);
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+}
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+
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+static grub_uint32_t
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+res_attr_data_len (void *res_attr_ptr)
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+{
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+ return u32at (res_attr_ptr, 0x10);
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+}
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+
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grub_ntfscomp_func_t grub_ntfscomp_func;
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static grub_err_t
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@@ -106,7 +124,7 @@ init_attr (struct grub_ntfs_attr *at, struct grub_ntfs_file *mft)
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{
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at->mft = mft;
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at->flags = (mft == &mft->data->mmft) ? GRUB_NTFS_AF_MMFT : 0;
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- at->attr_nxt = mft->buf + u16at (mft->buf, 0x14);
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+ at->attr_nxt = mft->buf + first_attr_off (mft->buf);
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at->attr_end = at->emft_buf = at->edat_buf = at->sbuf = NULL;
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}
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@@ -154,7 +172,7 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr)
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return NULL;
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}
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- new_pos = &at->emft_buf[u16at (at->emft_buf, 0x14)];
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+ new_pos = &at->emft_buf[first_attr_off (at->emft_buf)];
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while (*new_pos != 0xFF)
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{
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if ((*new_pos == *at->attr_cur)
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@@ -213,7 +231,7 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr)
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}
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else
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{
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- at->attr_nxt = at->attr_end + u16at (pa, 0x14);
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+ at->attr_nxt = at->attr_end + res_attr_data_off (pa);
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at->attr_end = at->attr_end + u32at (pa, 4);
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pa_end = at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR);
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}
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@@ -399,20 +417,20 @@ read_data (struct grub_ntfs_attr *at, grub_uint8_t *pa, grub_uint8_t *dest,
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if (pa[8] == 0)
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{
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- if (ofs + len > u32at (pa, 0x10))
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+ if (ofs + len > res_attr_data_len (pa))
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return grub_error (GRUB_ERR_BAD_FS, "read out of range");
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- if (u32at (pa, 0x10) > (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR))
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+ if (res_attr_data_len (pa) > (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR))
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return grub_error (GRUB_ERR_BAD_FS, "resident attribute too large");
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if (pa >= at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR))
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return grub_error (GRUB_ERR_BAD_FS, "resident attribute out of range");
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- if (u16at (pa, 0x14) + u32at (pa, 0x10) >
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+ if (res_attr_data_off (pa) + res_attr_data_len (pa) >
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(grub_addr_t) at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR) - (grub_addr_t) pa)
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return grub_error (GRUB_ERR_BAD_FS, "resident attribute out of range");
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- grub_memcpy (dest, pa + u16at (pa, 0x14) + ofs, len);
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+ grub_memcpy (dest, pa + res_attr_data_off (pa) + ofs, len);
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return 0;
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}
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@@ -556,7 +574,7 @@ init_file (struct grub_ntfs_file *mft, grub_uint64_t mftno)
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(unsigned long long) mftno);
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if (!pa[8])
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- mft->size = u32at (pa, 0x10);
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+ mft->size = res_attr_data_len (pa);
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else
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mft->size = u64at (pa, 0x30);
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@@ -805,7 +823,7 @@ grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
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(u32at (cur_pos, 0x18) != 0x490024) ||
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(u32at (cur_pos, 0x1C) != 0x300033))
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continue;
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- cur_pos += u16at (cur_pos, 0x14);
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+ cur_pos += res_attr_data_off (cur_pos);
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if (*cur_pos != 0x30) /* Not filename index */
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continue;
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break;
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@@ -834,7 +852,7 @@ grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
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{
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int is_resident = (cur_pos[8] == 0);
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- bitmap_len = ((is_resident) ? u32at (cur_pos, 0x10) :
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+ bitmap_len = ((is_resident) ? res_attr_data_len (cur_pos) :
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u32at (cur_pos, 0x28));
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bmp = grub_malloc (bitmap_len);
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@@ -855,14 +873,14 @@ grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
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goto done;
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}
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- if (u16at (cur_pos, 0x14) + u32at (cur_pos, 0x10) >
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+ if (res_attr_data_off (cur_pos) + res_attr_data_len (cur_pos) >
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(grub_addr_t) at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR) - (grub_addr_t) cur_pos)
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{
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grub_error (GRUB_ERR_BAD_FS, "resident bitmap out of range");
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goto done;
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}
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- grub_memcpy (bmp, cur_pos + u16at (cur_pos, 0x14),
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+ grub_memcpy (bmp, cur_pos + res_attr_data_off (cur_pos),
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bitmap_len);
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}
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else
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@@ -1226,12 +1244,12 @@ grub_ntfs_label (grub_device_t device, char **label)
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goto fail;
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}
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- if ((pa) && (pa[8] == 0) && (u32at (pa, 0x10)))
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+ if ((pa) && (pa[8] == 0) && (res_attr_data_len (pa)))
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{
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int len;
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- len = u32at (pa, 0x10) / 2;
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- pa += u16at (pa, 0x14);
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+ len = res_attr_data_len (pa) / 2;
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+ pa += res_attr_data_off (pa);
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if (mft->buf + (mft->data->mft_size << GRUB_NTFS_BLK_SHR) - pa >= 2 * len)
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*label = get_utf8 (pa, len);
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else
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--
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2.43.0
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