forked from luck/tmp_suning_uos_patched
d95236782b
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license v2 0 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 23 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.115786599@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
92 lines
1.6 KiB
C
92 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* vpd_decode.c
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*
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* Google VPD decoding routines.
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*
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* Copyright 2017 Google Inc.
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*/
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#include <linux/export.h>
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#include "vpd_decode.h"
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static int vpd_decode_len(const s32 max_len, const u8 *in,
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s32 *length, s32 *decoded_len)
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{
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u8 more;
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int i = 0;
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if (!length || !decoded_len)
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return VPD_FAIL;
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*length = 0;
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do {
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if (i >= max_len)
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return VPD_FAIL;
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more = in[i] & 0x80;
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*length <<= 7;
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*length |= in[i] & 0x7f;
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++i;
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} while (more);
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*decoded_len = i;
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return VPD_OK;
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}
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int vpd_decode_string(const s32 max_len, const u8 *input_buf, s32 *consumed,
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vpd_decode_callback callback, void *callback_arg)
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{
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int type;
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int res;
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s32 key_len;
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s32 value_len;
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s32 decoded_len;
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const u8 *key;
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const u8 *value;
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/* type */
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if (*consumed >= max_len)
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return VPD_FAIL;
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type = input_buf[*consumed];
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switch (type) {
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case VPD_TYPE_INFO:
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case VPD_TYPE_STRING:
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(*consumed)++;
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/* key */
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res = vpd_decode_len(max_len - *consumed, &input_buf[*consumed],
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&key_len, &decoded_len);
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if (res != VPD_OK || *consumed + decoded_len >= max_len)
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return VPD_FAIL;
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*consumed += decoded_len;
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key = &input_buf[*consumed];
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*consumed += key_len;
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/* value */
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res = vpd_decode_len(max_len - *consumed, &input_buf[*consumed],
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&value_len, &decoded_len);
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if (res != VPD_OK || *consumed + decoded_len > max_len)
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return VPD_FAIL;
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*consumed += decoded_len;
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value = &input_buf[*consumed];
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*consumed += value_len;
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if (type == VPD_TYPE_STRING)
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return callback(key, key_len, value, value_len,
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callback_arg);
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break;
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default:
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return VPD_FAIL;
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}
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return VPD_OK;
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}
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