diff options
Diffstat (limited to 'third_party/heimdal/lib/krb5/store_mem.c')
| -rw-r--r-- | third_party/heimdal/lib/krb5/store_mem.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/store_mem.c b/third_party/heimdal/lib/krb5/store_mem.c new file mode 100644 index 0000000..638c341 --- /dev/null +++ b/third_party/heimdal/lib/krb5/store_mem.c @@ -0,0 +1,212 @@ +/* + * Copyright (c) 1997 - 2000, 2002 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "krb5_locl.h" +#include "store-int.h" + +typedef struct mem_storage{ + unsigned char *base; + size_t size; + unsigned char *ptr; +}mem_storage; + +static ssize_t +mem_fetch(krb5_storage *sp, void *data, size_t size) +{ + mem_storage *s = (mem_storage*)sp->data; + if(size > (size_t)(s->base + s->size - s->ptr)) + size = s->base + s->size - s->ptr; + memmove(data, s->ptr, size); + sp->seek(sp, size, SEEK_CUR); + return size; +} + +static ssize_t +mem_store(krb5_storage *sp, const void *data, size_t size) +{ + mem_storage *s = (mem_storage*)sp->data; + if(size > (size_t)(s->base + s->size - s->ptr)) + size = s->base + s->size - s->ptr; + memmove(s->ptr, data, size); + sp->seek(sp, size, SEEK_CUR); + return size; +} + +static ssize_t +mem_no_store(krb5_storage *sp, const void *data, size_t size) +{ + return -1; +} + +static off_t +mem_seek(krb5_storage *sp, off_t offset, int whence) +{ + mem_storage *s = (mem_storage*)sp->data; + switch(whence){ + case SEEK_SET: + if((size_t)offset > s->size) + offset = s->size; + if(offset < 0) + offset = 0; + s->ptr = s->base + offset; + break; + case SEEK_CUR: + return sp->seek(sp, s->ptr - s->base + offset, SEEK_SET); + case SEEK_END: + return sp->seek(sp, s->size + offset, SEEK_SET); + default: + errno = EINVAL; + return -1; + } + return s->ptr - s->base; +} + +static int +mem_trunc(krb5_storage *sp, off_t offset) +{ + mem_storage *s = (mem_storage*)sp->data; + if((size_t)offset > s->size) + return ERANGE; + s->size = offset; + if ((s->ptr - s->base) > offset) + s->ptr = s->base + offset; + return 0; +} + +static int +mem_no_trunc(krb5_storage *sp, off_t offset) +{ + return EINVAL; +} + +/** + * Create a fixed size memory storage block + * + * @return A krb5_storage on success, or NULL on out of memory error. + * + * @ingroup krb5_storage + * + * @sa krb5_storage_mem() + * @sa krb5_storage_from_readonly_mem() + * @sa krb5_storage_from_data() + * @sa krb5_storage_from_fd() + * @sa krb5_storage_from_socket() + */ + +KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL +krb5_storage_from_mem(void *buf, size_t len) +{ + krb5_storage *sp = malloc(sizeof(krb5_storage)); + mem_storage *s; + if(sp == NULL) + return NULL; + s = malloc(sizeof(*s)); + if(s == NULL) { + free(sp); + return NULL; + } + sp->data = s; + sp->flags = 0; + sp->eof_code = HEIM_ERR_EOF; + s->base = buf; + s->size = len; + s->ptr = buf; + sp->fetch = mem_fetch; + sp->store = mem_store; + sp->seek = mem_seek; + sp->trunc = mem_trunc; + sp->fsync = NULL; + sp->free = NULL; + sp->max_alloc = UINT32_MAX/64; + return sp; +} + +/** + * Create a fixed size memory storage block + * + * @return A krb5_storage on success, or NULL on out of memory error. + * + * @ingroup krb5_storage + * + * @sa krb5_storage_mem() + * @sa krb5_storage_from_mem() + * @sa krb5_storage_from_readonly_mem() + * @sa krb5_storage_from_fd() + */ + +KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL +krb5_storage_from_data(krb5_data *data) +{ + return krb5_storage_from_mem(data->data, data->length); +} + +/** + * Create a fixed size memory storage block that is read only + * + * @return A krb5_storage on success, or NULL on out of memory error. + * + * @ingroup krb5_storage + * + * @sa krb5_storage_mem() + * @sa krb5_storage_from_mem() + * @sa krb5_storage_from_data() + * @sa krb5_storage_from_fd() + */ + +KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL +krb5_storage_from_readonly_mem(const void *buf, size_t len) +{ + krb5_storage *sp = malloc(sizeof(krb5_storage)); + mem_storage *s; + if(sp == NULL) + return NULL; + s = malloc(sizeof(*s)); + if(s == NULL) { + free(sp); + return NULL; + } + sp->data = s; + sp->flags = 0; + sp->eof_code = HEIM_ERR_EOF; + s->base = rk_UNCONST(buf); + s->size = len; + s->ptr = rk_UNCONST(buf); + sp->fetch = mem_fetch; + sp->store = mem_no_store; + sp->seek = mem_seek; + sp->trunc = mem_no_trunc; + sp->fsync = NULL; + sp->free = NULL; + sp->max_alloc = UINT32_MAX/64; + return sp; +} |