/**
* z_decomp_alloc - allocate space for a decompressor.
* @options: pointer to CCP option data
* @opt_len: length of the CCP option at @options.
*
* The @options pointer points to the a buffer containing the
* CCP option data for the compression being negotiated. It is
* formatted according to RFC1979, and describes the window
* size that we are requesting the peer to use in compressing
* data to be sent to us.
*
* Returns the pointer to the private state for the decompressor,
* or NULL if we could not allocate enough memory.
*/
static void *z_decomp_alloc(unsigned char *options, int opt_len)
{
struct ppp_deflate_state *state;
int w_size;
if (opt_len != CILEN_DEFLATE
|| (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
|| options[1] != CILEN_DEFLATE
|| DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
|| options[3] != DEFLATE_CHK_SEQUENCE)
return NULL;
w_size = DEFLATE_SIZE(options[2]);
if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
return NULL;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (state == NULL)
return NULL;
state->w_size = w_size;
state->strm.next_out = NULL;
state->strm.workspace = kmalloc(zlib_inflate_workspacesize(),
GFP_KERNEL|__GFP_REPEAT);
if (state->strm.workspace == NULL)
goto out_free;
if (zlib_inflateInit2(&state->strm, -w_size) != Z_OK)
goto out_free;
return (void *) state;
out_free:
z_decomp_free(state);
return NULL;
}
/**
* z_decomp_alloc - allocate space for a decompressor.
* @options: pointer to CCP option data
* @opt_len: length of the CCP option at @options.
*
* The @options pointer points to the a buffer containing the
* CCP option data for the compression being negotiated. It is
* formatted according to RFC1979, and describes the window
* size that we are requesting the peer to use in compressing
* data to be sent to us.
*
* Returns the pointer to the private state for the decompressor,
* or NULL if we could not allocate enough memory.
*/
static void *z_decomp_alloc(unsigned char *options, int opt_len)
{
struct ppp_deflate_state *state;
int w_size;
if (opt_len != CILEN_DEFLATE ||
(options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) ||
options[1] != CILEN_DEFLATE ||
DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL ||
options[3] != DEFLATE_CHK_SEQUENCE)
return NULL;
w_size = DEFLATE_SIZE(options[2]);
if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
return NULL;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (state == NULL)
return NULL;
state->w_size = w_size;
state->strm.next_out = NULL;
/* LGE_CHANGE_S [LS855:[email protected]] 2011-07-11, */
#if 0 /* Delete Warning Log - OMAPS00243976 */
state->strm.workspace = kmalloc(zlib_inflate_workspacesize(),
GFP_KERNEL|__GFP_REPEAT);
#else
state->strm.workspace = vmalloc(zlib_inflate_workspacesize());
#endif
/* LGE_CHANGE_E [LS855:[email protected]] 2011-07-11 */
if (state->strm.workspace == NULL)
goto out_free;
if (zlib_inflateInit2(&state->strm, -w_size) != Z_OK)
goto out_free;
return (void *) state;
out_free:
z_decomp_free(state);
return NULL;
}
