1 files changed, 209 insertions, 203 deletions
diff --git a/guid.c b/guid.c
index 8a71b7e..b4ee887 100644
--- a/guid.c
+++ b/guid.c
@@ -1,203 +1,209 @@
-/* Copyright (C) 2014 by John Cronin
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
-
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
-
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
-
-#ifdef WINDOWS
-#include <windows.h>
-#include <wincrypt.h>
-#endif
-
-#include "guid.h"
-
-#define GUID_FMT "%08X-%04hX-%04hX-%02hhX%02hhX-%02hhX%02hhX%02hhX%02hhX%02hhX%02hhX"
-
-static int rnd_init = 0;
-
-int guid_to_string(char *str, GUID *guid)
-{
-	if(guid == NULL)
-	{
-		fprintf(stderr, "guid_to_string: guid is null\n");
-		return -1;
-	}
-	if(str == NULL)
-	{
-		fprintf(stderr, "guid_to_string: str is null\n");
-		return -1;
-	}
-
-	sprintf(str, GUID_FMT, guid->data1, guid->data2, guid->data3, guid->data4[0], guid->data4[1],
-		guid->data4[2], guid->data4[3], guid->data4[4], guid->data4[5], guid->data4[6], guid->data4[7]);
-
-	return 0;
-}
-
-int string_to_guid(GUID *guid, char *str)
-{
-	if(guid == NULL)
-	{
-		fprintf(stderr, "string_to_guid: guid is null\n");
-		return -1;
-	}
-	if(str == NULL)
-	{
-		fprintf(stderr, "string_to_guid: str is null\n");
-		return -1;
-	}
-
-	sscanf(str, GUID_FMT, &guid->data1, &guid->data2, &guid->data3, &guid->data4[0], &guid->data4[1],
-		&guid->data4[2], &guid->data4[3], &guid->data4[4], &guid->data4[5], &guid->data4[6], &guid->data4[7]);
-
-	return 0;
-}
-
-int guid_to_bytestring(uint8_t *bytes, GUID *guid)
-{
-	int i;
-
-	if(guid == NULL)
-	{
-		fprintf(stderr, "guid_to_bytestring: guid is null\n");
-		return -1;
-	}
-	if(bytes == NULL)
-	{
-		fprintf(stderr, "guid_to_bytestring: bytes is null\n");
-		return -1;
-	}
-
-	*(uint32_t *)&bytes[0] = guid->data1;
-	*(uint16_t *)&bytes[4] = guid->data2;
-	*(uint16_t *)&bytes[6] = guid->data3;
-	for(i = 0; i < 8; i++)
-		bytes[8 + i] = guid->data4[i];
-
-	return 0;
-}
-
-int guid_is_zero(GUID *guid)
-{
-	int i;
-
-	if(guid->data1 != 0)
-		return 0;
-	if(guid->data2 != 0)
-		return 0;
-	if(guid->data3 != 0)
-		return 0;
-	for(i = 0; i < 8; i++)
-	{
-		if(guid->data4[i] != 0)
-			return 0;
-	}
-	return 1;
-}
-
-void init_rnd()
-{
-	/* Attempt to initialise the random number generator */
-	FILE *rnd = fopen("/dev/random", "r");
-	if(rnd != NULL)
-	{
-		unsigned int seed;
-		if(fread(&seed, 1, sizeof(unsigned int), rnd) == sizeof(unsigned int))
-		{
-			srand(seed);
-			fclose(rnd);
-			rnd_init = 1;
-			return;
-		}
-
-		fclose(rnd);
-	}
-
-#ifdef WINDOWS
-	{
-		HCRYPTPROV prov = 0;
-		if(!CryptAcquireContext(&prov, NULL, NULL, PROV_INTEL_SEC, CRYPT_VERIFYCONTEXT))
-		{
-			if(!CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
-				prov = 0;
-		}
-
-		if(prov != 0)
-		{
-			unsigned int seed;
-			CryptGenRandom(prov, sizeof(unsigned int), (BYTE *)&seed);
-			srand(seed);
-			rnd_init = 1;
-			return;
-		}
-	}
-#endif
-
-	{
-		time_t t = time(NULL);
-		struct tm *tmptr = gmtime(&t);
-		int seed = tmptr->tm_hour;
-		seed <<= 3;
-		seed ^= tmptr->tm_isdst;
-		seed <<= 3;
-		seed ^= tmptr->tm_mday;
-		seed <<= 3;
-		seed ^= tmptr->tm_min;
-		seed <<= 3;
-		seed ^= tmptr->tm_mon;
-		seed <<= 3;
-		seed ^= tmptr->tm_sec;
-		seed <<= 3;
-		seed ^= tmptr->tm_wday;
-		seed <<= 3;
-		seed ^= tmptr->tm_yday;
-		seed <<= 3;
-		seed ^= tmptr->tm_year;
-
-		srand((unsigned int)seed);
-		rnd_init = 1;
-		return;
-	}
-}
-
-uint8_t rnd_byte()
-{
-	if(rnd_init == 0)
-		init_rnd();
-
-	return (uint8_t)(rand() & 0xff);
-}
-
-int random_guid(GUID *guid)
-{
-	int i;
-
-	guid->data1 = (uint32_t)rnd_byte() | (((uint32_t)rnd_byte()) << 8) |
-		(((uint32_t)rnd_byte()) << 16) | (((uint32_t)rnd_byte()) << 24);
-	guid->data2 = (uint16_t)rnd_byte() | (((uint16_t)rnd_byte()) << 8);
-	guid->data3 = (uint16_t)rnd_byte() | (((uint16_t)((rnd_byte() & 0x0f) | 0x40)) << 8);
-	for(i = 0; i < 8; i++)
-		guid->data4[i] = rnd_byte();
-
-	return 0;
-}
+/* Copyright (C) 2014 by John Cronin
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#ifdef WINDOWS
+#include <windows.h>
+#include <wincrypt.h>
+#endif
+
+#include "guid.h"
+
+#define GUID_FMT                                                               \
+	"%08X-%04hX-%04hX-%02hhX%02hhX-%02hhX%02hhX%02hhX%02hhX%02hhX%02hhX"
+
+static int rnd_init = 0;
+
+int
+guid_to_string(char *str, GUID *guid)
+{
+	if (guid == NULL) {
+		fprintf(stderr, "guid_to_string: guid is null\n");
+		return -1;
+	}
+	if (str == NULL) {
+		fprintf(stderr, "guid_to_string: str is null\n");
+		return -1;
+	}
+
+	sprintf(str, GUID_FMT, guid->data1, guid->data2, guid->data3,
+		guid->data4[0], guid->data4[1], guid->data4[2], guid->data4[3],
+		guid->data4[4], guid->data4[5], guid->data4[6], guid->data4[7]);
+
+	return 0;
+}
+
+int
+string_to_guid(GUID *guid, char *str)
+{
+	if (guid == NULL) {
+		fprintf(stderr, "string_to_guid: guid is null\n");
+		return -1;
+	}
+	if (str == NULL) {
+		fprintf(stderr, "string_to_guid: str is null\n");
+		return -1;
+	}
+
+	sscanf(str, GUID_FMT, &guid->data1, &guid->data2, &guid->data3,
+		&guid->data4[0], &guid->data4[1], &guid->data4[2],
+		&guid->data4[3], &guid->data4[4], &guid->data4[5],
+		&guid->data4[6], &guid->data4[7]);
+
+	return 0;
+}
+
+int
+guid_to_bytestring(uint8_t *bytes, GUID *guid)
+{
+	int i;
+
+	if (guid == NULL) {
+		fprintf(stderr, "guid_to_bytestring: guid is null\n");
+		return -1;
+	}
+	if (bytes == NULL) {
+		fprintf(stderr, "guid_to_bytestring: bytes is null\n");
+		return -1;
+	}
+
+	*(uint32_t *)&bytes[0] = guid->data1;
+	*(uint16_t *)&bytes[4] = guid->data2;
+	*(uint16_t *)&bytes[6] = guid->data3;
+	for (i = 0; i < 8; i++)
+		bytes[8 + i] = guid->data4[i];
+
+	return 0;
+}
+
+int
+guid_is_zero(GUID *guid)
+{
+	int i;
+
+	if (guid->data1 != 0)
+		return 0;
+	if (guid->data2 != 0)
+		return 0;
+	if (guid->data3 != 0)
+		return 0;
+	for (i = 0; i < 8; i++) {
+		if (guid->data4[i] != 0)
+			return 0;
+	}
+	return 1;
+}
+
+void
+init_rnd()
+{
+	/* Attempt to initialise the random number generator */
+	FILE *rnd = fopen("/dev/random", "r");
+	if (rnd != NULL) {
+		unsigned int seed;
+		if (fread(&seed, 1, sizeof(unsigned int), rnd) ==
+			sizeof(unsigned int)) {
+			srand(seed);
+			fclose(rnd);
+			rnd_init = 1;
+			return;
+		}
+
+		fclose(rnd);
+	}
+
+#ifdef WINDOWS
+	{
+		HCRYPTPROV prov = 0;
+		if (!CryptAcquireContext(&prov, NULL, NULL, PROV_INTEL_SEC,
+			    CRYPT_VERIFYCONTEXT)) {
+			if (!CryptAcquireContext(&prov, NULL, NULL,
+				    PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
+				prov = 0;
+		}
+
+		if (prov != 0) {
+			unsigned int seed;
+			CryptGenRandom(
+				prov, sizeof(unsigned int), (BYTE *)&seed);
+			srand(seed);
+			rnd_init = 1;
+			return;
+		}
+	}
+#endif
+
+	{
+		time_t t = time(NULL);
+		struct tm *tmptr = gmtime(&t);
+		int seed = tmptr->tm_hour;
+		seed <<= 3;
+		seed ^= tmptr->tm_isdst;
+		seed <<= 3;
+		seed ^= tmptr->tm_mday;
+		seed <<= 3;
+		seed ^= tmptr->tm_min;
+		seed <<= 3;
+		seed ^= tmptr->tm_mon;
+		seed <<= 3;
+		seed ^= tmptr->tm_sec;
+		seed <<= 3;
+		seed ^= tmptr->tm_wday;
+		seed <<= 3;
+		seed ^= tmptr->tm_yday;
+		seed <<= 3;
+		seed ^= tmptr->tm_year;
+
+		srand((unsigned int)seed);
+		rnd_init = 1;
+		return;
+	}
+}
+
+uint8_t
+rnd_byte()
+{
+	if (rnd_init == 0)
+		init_rnd();
+
+	return (uint8_t)(rand() & 0xff);
+}
+
+int
+random_guid(GUID *guid)
+{
+	int i;
+
+	guid->data1 = (uint32_t)rnd_byte() | (((uint32_t)rnd_byte()) << 8) |
+		      (((uint32_t)rnd_byte()) << 16) |
+		      (((uint32_t)rnd_byte()) << 24);
+	guid->data2 = (uint16_t)rnd_byte() | (((uint16_t)rnd_byte()) << 8);
+	guid->data3 = (uint16_t)rnd_byte() |
+		      (((uint16_t)((rnd_byte() & 0x0f) | 0x40)) << 8);
+	for (i = 0; i < 8; i++)
+		guid->data4[i] = rnd_byte();
+
+	return 0;
+}