70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <lib/guid.h>
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#include <lib/misc.h>
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bool is_valid_guid(const char *s) {
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for (size_t i = 0; ; i++) {
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switch (i) {
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case 8:
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case 13:
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case 18:
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case 23:
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if (s[i] != '-')
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return false;
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break;
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case 36:
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return s[i] == 0;
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default:
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if (digit_to_int(s[i]) == -1)
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return false;
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break;
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}
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}
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}
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static void guid_convert_le_cluster(uint8_t *dest, const char *s, int len) {
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size_t p = 0;
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for (int i = len - 1; i >= 0; i--) {
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int val = digit_to_int(s[i]);
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i % 2 ? (dest[p] = val) : (dest[p++] |= val << 4);
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}
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}
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static void guid_convert_be_cluster(uint8_t *dest, const char *s, int len) {
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size_t p = 0;
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for (int i = 0; i < len; i++) {
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int val = digit_to_int(s[i]);
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i % 2 ? (dest[p++] |= val) : (dest[p] = val << 4);
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}
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}
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bool string_to_guid_be(struct guid *guid, const char *s) {
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if (!is_valid_guid(s))
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return false;
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guid_convert_be_cluster((uint8_t *)guid + 0, s + 0, 8);
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guid_convert_be_cluster((uint8_t *)guid + 4, s + 9, 4);
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guid_convert_be_cluster((uint8_t *)guid + 6, s + 14, 4);
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guid_convert_be_cluster((uint8_t *)guid + 8, s + 19, 4);
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guid_convert_be_cluster((uint8_t *)guid + 10, s + 24, 12);
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return true;
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}
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bool string_to_guid_mixed(struct guid *guid, const char *s) {
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if (!is_valid_guid(s))
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return false;
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guid_convert_le_cluster((uint8_t *)guid + 0, s + 0, 8);
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guid_convert_le_cluster((uint8_t *)guid + 4, s + 9, 4);
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guid_convert_le_cluster((uint8_t *)guid + 6, s + 14, 4);
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guid_convert_be_cluster((uint8_t *)guid + 8, s + 19, 4);
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guid_convert_be_cluster((uint8_t *)guid + 10, s + 24, 12);
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return true;
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}
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