system/qemu
system/qemu
1
0
Fork 0
mirror of https://gitlab.com/qemu-project/qemu synced 2024-11-05 20:35:44 +00:00
Code Issues Projects Releases Packages Wiki Activity

block-vpc: Split up struct vpc_subheader (Kevin Wolf)

Browse source 
struct vpc_subheader currently is a union of two completely different
data structures (the Hard Disk Footer and the Dynamic Disk Header).
That doesn't make too much sense, so split them up.

Signed-off-by: Kevin Wolf <kwolf@suse.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6454 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-01-26 20:26:46 +00:00
parent f55761a0c4
commit b9fa33a6e4
1 changed files with 45 additions and 44 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

89
block-vpc.c
View file

@ -31,36 +31,31 @@
//#define CACHE
// always big-endian
struct vpc_subheader {
char magic[8]; // "conectix" / "cxsparse"
union {
struct {
uint32_t unk1[2];
uint32_t unk2; // always zero?
uint32_t subheader_offset;
uint32_t unk3; // some size?
char creator[4]; // "vpc "
uint16_t major;
uint16_t minor;
char guest[4]; // "Wi2k"
uint32_t unk4[7];
uint8_t vnet_id[16]; // virtual network id, purpose unknown
// next 16 longs are used, but dunno the purpose
// next 6 longs unknown, following 7 long maybe a serial
char padding[HEADER_SIZE - 84];
} main;
struct {
uint32_t unk1[2]; // all bits set
uint32_t unk2; // always zero?
uint32_t pagetable_offset;
uint32_t unk3;
uint32_t pagetable_entries; // 32bit/entry
uint32_t pageentry_size; // 512*8*512
uint32_t nb_sectors;
char padding[HEADER_SIZE - 40];
} sparse;
char padding[HEADER_SIZE - 8];
} type;
struct vhd_footer {
char creator[8]; // "conectix
uint32_t unk1[2];
uint32_t unk2; // always zero?
uint32_t subheader_offset;
uint32_t unk3; // some size?
char creator_app[4]; // "vpc "
uint16_t major;
uint16_t minor;
char guest[4]; // "Wi2k"
uint32_t unk4[7];
uint8_t vnet_id[16]; // virtual network id, purpose unknown
// next 16 longs are used, but dunno the purpose
// next 6 longs unknown, following 7 long maybe a serial
};
struct vhd_dyndisk_header {
char magic[8]; // "cxsparse"
uint32_t unk1[2]; // all bits set
uint32_t unk2; // always zero?
uint32_t pagetable_offset;
uint32_t unk3;
uint32_t pagetable_entries; // 32bit/entry
uint32_t pageentry_size; // 512*8*512
uint32_t nb_sectors;
};
typedef struct BDRVVPCState {
@ -90,7 +85,9 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
{
BDRVVPCState *s = bs->opaque;
int fd, i;
struct vpc_subheader header;
struct vhd_footer* footer;
struct vhd_dyndisk_header* dyndisk_header;
uint8_t buf[HEADER_SIZE];
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
@ -100,25 +97,29 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
s->fd = fd;
if (read(fd, &header, HEADER_SIZE) != HEADER_SIZE)
if (read(fd, buf, HEADER_SIZE) != HEADER_SIZE)
goto fail;
if (strncmp(header.magic, "conectix", 8))
goto fail;
lseek(s->fd, be32_to_cpu(header.type.main.subheader_offset), SEEK_SET);
if (read(fd, &header, HEADER_SIZE) != HEADER_SIZE)
footer = (struct vhd_footer*) buf;
if (strncmp(footer->creator, "conectix", 8))
goto fail;
if (strncmp(header.magic, "cxsparse", 8))
goto fail;
lseek(s->fd, be32_to_cpu(footer->subheader_offset), SEEK_SET);
if (read(fd, buf, HEADER_SIZE) != HEADER_SIZE)
goto fail;
bs->total_sectors = ((uint64_t)be32_to_cpu(header.type.sparse.pagetable_entries) *
be32_to_cpu(header.type.sparse.pageentry_size)) / 512;
footer = NULL;
dyndisk_header = (struct vhd_dyndisk_header*) buf;
lseek(s->fd, be32_to_cpu(header.type.sparse.pagetable_offset), SEEK_SET);
if (strncmp(dyndisk_header->magic, "cxsparse", 8))
goto fail;
s->pagetable_entries = be32_to_cpu(header.type.sparse.pagetable_entries);
bs->total_sectors = ((uint64_t)be32_to_cpu(dyndisk_header->pagetable_entries) *
be32_to_cpu(dyndisk_header->pageentry_size)) / 512;
lseek(s->fd, be32_to_cpu(dyndisk_header->pagetable_offset), SEEK_SET);
s->pagetable_entries = be32_to_cpu(dyndisk_header->pagetable_entries);
s->pagetable = qemu_malloc(s->pagetable_entries * 4);
if (!s->pagetable)
goto fail;
@ -128,7 +129,7 @@ static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
for (i = 0; i < s->pagetable_entries; i++)
be32_to_cpus(&s->pagetable[i]);
s->pageentry_size = be32_to_cpu(header.type.sparse.pageentry_size);
s->pageentry_size = be32_to_cpu(dyndisk_header->pageentry_size);
#ifdef CACHE
s->pageentry_u8 = qemu_malloc(512);
if (!s->pageentry_u8)