Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * vpd_decode.c
 *
 * Google VPD decoding routines.
 *
 * Copyright 2017 Google Inc.
 */
 
#include "vpd_decode.h"
 
static int vpd_decode_len(const u32 max_len, const u8 *in,
<------><------><------>  u32 *length, u32 *decoded_len)
{
<------>u8 more;
<------>int i = 0;
 
<------>if (!length || !decoded_len)
<------><------>return VPD_FAIL;
 
<------>*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;
}
 
static int vpd_decode_entry(const u32 max_len, const u8 *input_buf,
<------><------><------>    u32 *_consumed, const u8 **entry, u32 *entry_len)
{
<------>u32 decoded_len;
<------>u32 consumed = *_consumed;
 
<------>if (vpd_decode_len(max_len - consumed, &input_buf[consumed],
<------><------><------>   entry_len, &decoded_len) != VPD_OK)
<------><------>return VPD_FAIL;
<------>if (max_len - consumed < decoded_len)
<------><------>return VPD_FAIL;
 
<------>consumed += decoded_len;
<------>*entry = input_buf + consumed;
 
<------>/* entry_len is untrusted data and must be checked again. */
<------>if (max_len - consumed < *entry_len)
<------><------>return VPD_FAIL;
 
<------>consumed += *entry_len;
<------>*_consumed = consumed;
<------>return VPD_OK;
}
 
int vpd_decode_string(const u32 max_len, const u8 *input_buf, u32 *consumed,
<------><------>      vpd_decode_callback callback, void *callback_arg)
{
<------>int type;
<------>u32 key_len;
<------>u32 value_len;
<------>const u8 *key;
<------>const u8 *value;
 
<------>/* type */
<------>if (*consumed >= max_len)
<------><------>return VPD_FAIL;
 
<------>type = input_buf[*consumed];
 
<------>switch (type) {
<------>case VPD_TYPE_INFO:
<------>case VPD_TYPE_STRING:
<------><------>(*consumed)++;
 
<------><------>if (vpd_decode_entry(max_len, input_buf, consumed, &key,
<------><------><------><------>     &key_len) != VPD_OK)
<------><------><------>return VPD_FAIL;
 
<------><------>if (vpd_decode_entry(max_len, input_buf, consumed, &value,
<------><------><------><------>     &value_len) != VPD_OK)
<------><------><------>return VPD_FAIL;
 
<------><------>if (type == VPD_TYPE_STRING)
<------><------><------>return callback(key, key_len, value, value_len,
<------><------><------><------><------>callback_arg);
<------><------>break;
 
<------>default:
<------><------>return VPD_FAIL;
<------>}
 
<------>return VPD_OK;
}