ad2ac9d5c5
This patch imports lib_vpd.h and vpd_decode.c from the Chromium Vital Product Data project. This library is used to parse VPD sections obtained from coreboot table entries describing Chromebook devices product data. Only the sections of type VPD_TYPE_STRING are decoded. The VPD string sections in the coreboot tables contain the type (1 byte set to 0x01 for strings), the key length, the key ascii array, the value length, and the value ascii array. The key and value arrays are not null terminated. Signed-off-by: Wei-Ning Huang <wnhuang@google.com> Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
100 lines
2 KiB
C
100 lines
2 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2.0 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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