| /* |
| * blob - generic type for storing an array and a length. |
| * |
| * This file initially created by Google, Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <connman/blob.h> |
| #include <glib.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| /* |
| * Allocate memory for a new blob structure and its internal buffer. |
| * |
| * If data is non-NULL, the first len bytes of it will be used to initialize |
| * the new blob's internal buffer. The internal buffer is automatically freed |
| * by blob_free(). |
| * |
| * If data is NULL, it can be assigned by the caller to point to any buffer. |
| * That buffer will not be freed by blob_free(). |
| * |
| * @blob: pointer to pointer to the new blob |
| * @len: length of new blob's data array |
| * @data: if not NULL, used to initialize new blob's data array. |
| * @return: -ENOMEM, or 0 on success. |
| */ |
| int blob_new(struct blob **blob, size_t len, const char *data) |
| { |
| /* Allocate struct followed by an internal buffer. */ |
| *blob = g_try_malloc(sizeof(**blob) + len); |
| if (*blob == NULL) |
| return -ENOMEM; |
| |
| (*blob)->len = len; |
| if (len == 0) { |
| /* |
| * When len ==0, there is no internal buffer. |
| * Instead point to caller's data, usually NULL. |
| * If not NULL, caller must manually set len, and free data. |
| */ |
| (*blob)->data = (char *)data; |
| } else { |
| /* Point to the internal buffer. */ |
| (*blob)->data = (*blob)->buffer; |
| |
| /* If data was provided, use it to initialize buffer */ |
| if (data != NULL) |
| memcpy((*blob)->data, data, len); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Allocate memory for a new blob structure, and initialize its buffer from the |
| * given '\0'-terminated string of ASCII hexadecimal digits. |
| * |
| * @blob: pointer to pointer to the new blob |
| * @hex: '\0'-terminated string whose length must be > 0, |
| * and must have an even number of digits. |
| * @return: -ENOMEM, -EINVAL or 0 on success. |
| */ |
| int blob_new_from_hex(struct blob **blob, const char *hex) |
| { |
| size_t hex_len; |
| size_t blob_len; |
| int ret; |
| int i; |
| |
| for (i = 0; hex[i] != '\0'; i++) |
| if (!g_ascii_isxdigit(hex[i])) |
| return -EINVAL; |
| |
| hex_len = i; |
| if (hex_len == 0 || (hex_len % 2) != 0) |
| return -EINVAL; |
| |
| blob_len = hex_len / 2; |
| ret = blob_new(blob, blob_len, NULL); |
| if (ret < 0) |
| return ret; |
| |
| for (i = 0; i < blob_len; i++) |
| (*blob)->data[i] = 16 * g_ascii_xdigit_value(hex[2*i]) |
| + g_ascii_xdigit_value(hex[2*i+1]); |
| |
| return 0; |
| } |
| |
| /* |
| * Free memory for blob structure and its internal buffer. |
| * @blob: blob to free |
| */ |
| void blob_free(struct blob *blob) |
| { |
| g_free(blob); |
| } |
| |