Eric Lee / smarc-uboot

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lib/uuid.c 1.4 KB
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e11938eab   Jason Hobbs   lib: add uuid_str... 
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  /*
   * Copyright 2011 Calxeda, Inc.
   *
1a4596601   Wolfgang Denk   Add GPL-2.0+ SPDX... 
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   * SPDX-License-Identifier:	GPL-2.0+
e11938eab   Jason Hobbs   lib: add uuid_str... 
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   */
  
  #include <linux/ctype.h>
  #include "common.h"
  
  /*
   * This is what a UUID string looks like.
   *
   * x is a hexadecimal character. fields are separated by '-'s. When converting
   * to a binary UUID, le means the field should be converted to little endian,
   * and be means it should be converted to big endian.
   *
   * 0        9    14   19   24
   * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
   *    le     le   le   be       be
   */
  
  int uuid_str_valid(const char *uuid)
  {
  	int i, valid;
  
  	if (uuid == NULL)
  		return 0;
  
  	for (i = 0, valid = 1; uuid[i] && valid; i++) {
  		switch (i) {
  		case 8: case 13: case 18: case 23:
  			valid = (uuid[i] == '-');
  			break;
  		default:
  			valid = isxdigit(uuid[i]);
  			break;
  		}
  	}
  
  	if (i != 36 || !valid)
  		return 0;
  
  	return 1;
  }
  
  void uuid_str_to_bin(const char *uuid, unsigned char *out)
  {
  	uint16_t tmp16;
  	uint32_t tmp32;
  	uint64_t tmp64;
  
  	if (!uuid || !out)
  		return;
  
  	tmp32 = cpu_to_le32(simple_strtoul(uuid, NULL, 16));
  	memcpy(out, &tmp32, 4);
  
  	tmp16 = cpu_to_le16(simple_strtoul(uuid + 9, NULL, 16));
  	memcpy(out + 4, &tmp16, 2);
  
  	tmp16 = cpu_to_le16(simple_strtoul(uuid + 14, NULL, 16));
  	memcpy(out + 6, &tmp16, 2);
  
  	tmp16 = cpu_to_be16(simple_strtoul(uuid + 19, NULL, 16));
  	memcpy(out + 8, &tmp16, 2);
  
  	tmp64 = cpu_to_be64(simple_strtoull(uuid + 24, NULL, 16));
  	memcpy(out + 10, (char *)&tmp64 + 2, 6);
  }