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* grub-core/io/lzopio.c (test_header): Some cleanups.

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This commit is contained in:
Szymon Janc 2011-09-06 21:21:13 +02:00
parent 579c12fbb4
commit 9c4f9ca010
1 changed files with 81 additions and 96 deletions
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147
grub-core/io/lzopio.c
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@ -272,72 +272,60 @@ calculate_uncompressed_size (grub_file_t file)
return 1;
}
/* XXX Do something with this function... */
struct lzop_header
{
grub_uint8_t magic[LZOP_MAGIC_SIZE];
grub_uint16_t lzop_version;
grub_uint16_t lib_version;
grub_uint16_t lib_version_ext;
grub_uint8_t method;
grub_uint8_t level;
grub_uint32_t flags;
/* grub_uint32_t filter; */ /* No filters support. Rarely used anyway. */
grub_uint32_t mode;
grub_uint32_t mtime_lo;
grub_uint32_t mtime_hi;
grub_uint8_t name_len;
} __attribute__ ((packed));
static int
test_header (grub_file_t file)
{
grub_lzopio_t lzopio = file->data;
unsigned char magic[LZOP_MAGIC_SIZE];
grub_uint16_t lzopver, ver, ver_ext;
grub_uint8_t method, level, name_len;
grub_uint32_t flags, mode, filter, mtime_lo, mtime_hi, checksum;
unsigned char *name = NULL;
struct lzop_header header;
grub_uint32_t flags, checksum;
const gcry_md_spec_t *hcheck;
grub_uint8_t *context = NULL;
grub_uint8_t *name = NULL;
if (grub_file_read (lzopio->file, magic, sizeof (magic)) != sizeof (magic))
if (grub_file_read (lzopio->file, &header, sizeof (header)) != sizeof (header))
{
grub_error (GRUB_ERR_BAD_FILE_TYPE, "no lzop magic found");
return 0;
}
if (grub_memcmp (magic, LZOP_MAGIC, LZOP_MAGIC_SIZE) != 0)
if (grub_memcmp (header.magic, LZOP_MAGIC, LZOP_MAGIC_SIZE) != 0)
{
grub_error (GRUB_ERR_BAD_FILE_TYPE, "no lzop magic found");
return 0;
}
/* LZOP version. */
if (grub_file_read (lzopio->file, &lzopver, sizeof (lzopver)) !=
sizeof (lzopver))
goto CORRUPTED;
/* LZO lib version. */
if (grub_file_read (lzopio->file, &ver, sizeof (ver)) != sizeof (ver))
goto CORRUPTED;
ver = grub_be_to_cpu16 (ver);
if (ver >= LZOP_NEW_LIB)
{
/* Read version of lib needed to extract data. */
if (grub_file_read (lzopio->file, &ver_ext, sizeof (ver_ext)) !=
sizeof (ver_ext))
goto CORRUPTED;
/* Too new version, should upgrade minilzo? */
if (grub_be_to_cpu16 (ver_ext) > MINILZO_VERSION)
if (grub_be_to_cpu16(header.lib_version) < LZOP_NEW_LIB)
{
grub_error (GRUB_ERR_BAD_COMPRESSED_DATA,
"unsupported LZO version");
"unsupported (too old) LZOP version");
return 0;
}
}
if (grub_file_read (lzopio->file, &method, sizeof (method)) !=
sizeof (method))
goto CORRUPTED;
if (ver >= LZOP_NEW_LIB)
/* Too new version, should upgrade minilzo? */
if (grub_be_to_cpu16 (header.lib_version_ext) > MINILZO_VERSION)
{
if (grub_file_read (lzopio->file, &level, sizeof (level)) !=
sizeof (level))
goto CORRUPTED;
grub_error (GRUB_ERR_BAD_COMPRESSED_DATA,
"unsupported (too new) LZO version");
return 0;
}
if (grub_file_read (lzopio->file, &flags, sizeof (flags)) != sizeof (flags))
goto CORRUPTED;
flags = grub_be_to_cpu32 (flags);
flags = grub_be_to_cpu32 (header.flags);
if (flags & F_CRC32_D)
{
@ -366,58 +354,53 @@ test_header (grub_file_t file)
else
hcheck = grub_crypto_lookup_md_by_name ("adler32");
hcheck++;
if (flags & F_H_FILTER)
{
if (grub_file_read (lzopio->file, &filter, sizeof (filter)) !=
sizeof (filter))
goto CORRUPTED;
}
if (grub_file_read (lzopio->file, &mode, sizeof (mode)) != sizeof (mode))
goto CORRUPTED;
if (grub_file_read (lzopio->file, &mtime_lo, sizeof (mtime_lo)) !=
sizeof (mtime_lo))
goto CORRUPTED;
if (ver >= LZOP_NEW_LIB)
{
if (grub_file_read (lzopio->file, &mtime_hi, sizeof (mtime_hi)) !=
sizeof (mtime_hi))
goto CORRUPTED;
}
if (grub_file_read (lzopio->file, &name_len, sizeof (name_len)) !=
sizeof (name_len))
goto CORRUPTED;
if (name_len != 0)
{
name = grub_malloc (name_len);
if (!name)
if (hcheck) {
context = grub_malloc(hcheck->contextsize);
if (! context)
return 0;
if (grub_file_read (lzopio->file, name, name_len) != name_len)
hcheck->init(context);
/* MAGIC is not included in check calculation. */
hcheck->write(context, &header.lzop_version, sizeof(header)- LZOP_MAGIC_SIZE);
}
if (header.name_len != 0)
{
name = grub_malloc (header.name_len);
if (! name)
{
grub_free (context);
return 0;
}
if (grub_file_read (lzopio->file, name, header.name_len) !=
header.name_len)
{
grub_free(name);
goto CORRUPTED;
}
if (hcheck)
hcheck->write(context, name, header.name_len);
grub_free(name);
}
if (hcheck)
hcheck->final(context);
if (grub_file_read (lzopio->file, &checksum, sizeof (checksum)) !=
sizeof (checksum))
goto CORRUPTED;
if (hcheck)
{
grub_free (name);
checksum = grub_cpu_to_be32(checksum);
if (memcmp(&checksum, hcheck->read(context), sizeof(checksum)) != 0)
goto CORRUPTED;
}
grub_free (name);
/* XXX Validate header checksum here. */
if (checksum == checksum)
{
lzopio->start_block_off = grub_file_tell (lzopio->file);
if (calculate_uncompressed_size (file) < 0)
@ -432,10 +415,12 @@ test_header (grub_file_t file)
lzopio->saved_off = 0;
return 1;
}
CORRUPTED:
grub_error (GRUB_ERR_BAD_COMPRESSED_DATA, "lzop file corrupted");
grub_free(name);
return 0;
}