| /* |
| * Copyright (c) 2014 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| * |
| */ |
| #include <assert.h> |
| #include "lib_vpd.h" |
| |
| int decodeLen( |
| const int32_t max_len, |
| const uint8_t *in, |
| int32_t *length, |
| int32_t *decoded_len) { |
| uint8_t more; |
| int i = 0; |
| |
| assert(length); |
| assert(decoded_len); |
| |
| *length = 0; |
| do { |
| if (i >= max_len) return VPD_FAIL; |
| more = in[i] & 0x80; |
| *length <<= 7; |
| *length |= in[i] & 0x7f; |
| ++i; |
| } while (more); |
| |
| *decoded_len = i; |
| |
| return VPD_OK; |
| } |
| |
| /* Sequentially decodes type, key, and value. |
| */ |
| int decodeVpdString( |
| const int32_t max_len, |
| const uint8_t *input_buf, |
| int32_t *consumed, |
| VpdDecodeCallback callback, |
| void *callback_arg) { |
| int type; |
| int32_t key_len, value_len; |
| int32_t decoded_len; |
| const uint8_t *key, *value; |
| |
| /* type */ |
| if (*consumed >= max_len) |
| return VPD_FAIL; |
| |
| type = input_buf[*consumed]; |
| switch (type) { |
| case VPD_TYPE_INFO: |
| case VPD_TYPE_STRING: |
| (*consumed)++; |
| |
| /* key */ |
| if (VPD_OK != decodeLen(max_len - *consumed, &input_buf[*consumed], |
| &key_len, &decoded_len) || |
| *consumed + decoded_len >= max_len) { |
| return VPD_FAIL; |
| } |
| |
| *consumed += decoded_len; |
| key = &input_buf[*consumed]; |
| *consumed += key_len; |
| |
| /* value */ |
| if (VPD_OK != decodeLen(max_len - *consumed, &input_buf[*consumed], |
| &value_len, &decoded_len) || |
| *consumed + decoded_len > max_len) { |
| return VPD_FAIL; |
| } |
| *consumed += decoded_len; |
| value = &input_buf[*consumed]; |
| *consumed += value_len; |
| |
| if (type == VPD_TYPE_STRING) |
| return callback(key, key_len, value, value_len, callback_arg); |
| |
| return VPD_OK; |
| |
| default: |
| return VPD_FAIL; |
| break; |
| } |
| return VPD_OK; |
| } |