The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file op_growable_buffer.c |
| 3 | * a growable buffer implementation |
| 4 | * |
| 5 | * @remark Copyright 2007 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author Philippe Elie |
| 9 | */ |
| 10 | |
| 11 | #include "op_growable_buffer.h" |
| 12 | #include "op_libiberty.h" |
| 13 | |
| 14 | #include <string.h> |
| 15 | #include <stdlib.h> |
| 16 | |
| 17 | void init_buffer(struct growable_buffer * b) |
| 18 | { |
| 19 | b->max_size = 0; |
| 20 | b->size = 0; |
| 21 | b->p = NULL; |
| 22 | } |
| 23 | |
| 24 | |
| 25 | void free_buffer(struct growable_buffer * b) |
| 26 | { |
| 27 | free(b->p); |
| 28 | } |
| 29 | |
| 30 | |
| 31 | static void grow_buffer(struct growable_buffer * b) |
| 32 | { |
| 33 | size_t new_size = (b->max_size + b->size) * 2; |
| 34 | b->p = xrealloc(b->p, new_size); |
| 35 | b->max_size = new_size; |
| 36 | } |
| 37 | |
| 38 | |
| 39 | void add_data(struct growable_buffer * b, void const * data, size_t len) |
| 40 | { |
| 41 | size_t old_size = b->size; |
| 42 | b->size += len; |
| 43 | if (b->size > b->max_size) |
| 44 | grow_buffer(b); |
| 45 | memcpy(b->p + old_size, data, len); |
| 46 | } |