Bill Richardson | d6ff721 | 2010-05-27 12:27:32 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 2 | * Use of this source code is governed by a BSD-style license that can be |
| 3 | * found in the LICENSE file. |
| 4 | * |
| 5 | * Stub implementations of utility functions which call their linux-specific |
| 6 | * equivalents. |
| 7 | */ |
| 8 | |
| 9 | #include "stateful_util.h" |
| 10 | |
| 11 | #include <stdarg.h> |
| 12 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | |
Randall Spangler | a9f17aa | 2010-05-27 16:18:35 -0700 | [diff] [blame] | 15 | void* StatefulSkip(MemcpyState* state, uint64_t len) { |
| 16 | if (state->overrun) |
| 17 | return NULL; |
| 18 | if (len > state->remaining_len) { |
| 19 | state->overrun = 1; |
| 20 | return NULL; |
| 21 | } |
| 22 | state->remaining_buf += len; |
| 23 | state->remaining_len -= len; |
| 24 | return state; // have to return something non-NULL |
| 25 | } |
| 26 | |
Bill Richardson | d6ff721 | 2010-05-27 12:27:32 -0700 | [diff] [blame] | 27 | void* StatefulMemcpy(MemcpyState* state, void* dst, |
| 28 | uint64_t len) { |
| 29 | if (state->overrun) |
| 30 | return NULL; |
| 31 | if (len > state->remaining_len) { |
| 32 | state->overrun = 1; |
| 33 | return NULL; |
| 34 | } |
| 35 | Memcpy(dst, state->remaining_buf, len); |
| 36 | state->remaining_buf += len; |
| 37 | state->remaining_len -= len; |
| 38 | return dst; |
| 39 | } |
| 40 | |
| 41 | const void* StatefulMemcpy_r(MemcpyState* state, const void* src, |
| 42 | uint64_t len) { |
| 43 | if (state->overrun) |
| 44 | return NULL; |
| 45 | if (len > state->remaining_len) { |
| 46 | state->overrun = 1; |
| 47 | return NULL; |
| 48 | } |
| 49 | Memcpy(state->remaining_buf, src, len); |
| 50 | state->remaining_buf += len; |
| 51 | state->remaining_len -= len; |
| 52 | return src; |
| 53 | } |
| 54 | |
| 55 | const void* StatefulMemset_r(MemcpyState* state, const uint8_t val, |
| 56 | uint64_t len) { |
| 57 | if (state->overrun) |
| 58 | return NULL; |
| 59 | if (len > state->remaining_len) { |
| 60 | state->overrun = 1; |
| 61 | return NULL; |
| 62 | } |
| 63 | Memset(state->remaining_buf, val, len); |
| 64 | state->remaining_buf += len; |
| 65 | state->remaining_len -= len; |
| 66 | return state; // have to return something non-NULL |
| 67 | } |