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read_hex_bytes() is going to be used in lib/util/rfc1738.c. parse_guid_string() is shifted for two reasons: Firstly, it is called very often in some operations, sometimes constituting a few percent of the CPU load, and it makes several calls to read_hex_bytes(). We want the compiler to be able to inline those calls if it thinks that is wise. Secondly, there are other places that could do with fast GUID parsing. Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
101 lines
2.0 KiB
C
101 lines
2.0 KiB
C
#include "replace.h"
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#include "libcli/util/ntstatus.h"
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#include "util_str_hex.h"
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NTSTATUS read_hex_bytes(const char *s, uint hexchars, uint64_t *dest)
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{
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uint64_t x = 0;
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uint i;
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char c;
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if ((hexchars & 1) || hexchars > 16) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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for (i = 0; i < hexchars; i++) {
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x <<= 4;
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c = s[i];
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if (c >= '0' && c <= '9') {
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x += c - '0';
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}
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else if (c >= 'a' && c <= 'f') {
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x += c - 'a' + 10;
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}
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else if (c >= 'A' && c <= 'F') {
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x += c - 'A' + 10;
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}
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else {
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/* BAD character (including '\0') */
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return NT_STATUS_INVALID_PARAMETER;
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}
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}
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*dest = x;
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return NT_STATUS_OK;
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}
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NTSTATUS parse_guid_string(const char *s,
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uint32_t *time_low,
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uint32_t *time_mid,
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uint32_t *time_hi_and_version,
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uint32_t *clock_seq,
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uint32_t *node)
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{
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uint64_t tmp;
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NTSTATUS status;
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int i;
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/* "e12b56b6-0a95-11d1-adbb-00c04fd8d5cd"
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| | | | |
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| | | | \ node[6]
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| | | \_____ clock_seq[2]
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| | \__________ time_hi_and_version
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| \_______________ time_mid
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\_____________________ time_low
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*/
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status = read_hex_bytes(s, 8, &tmp);
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if (!NT_STATUS_IS_OK(status) || s[8] != '-') {
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return NT_STATUS_INVALID_PARAMETER;
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}
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*time_low = tmp;
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s += 9;
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status = read_hex_bytes(s, 4, &tmp);
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if (!NT_STATUS_IS_OK(status) || s[4] != '-') {
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return NT_STATUS_INVALID_PARAMETER;
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}
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*time_mid = tmp;
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s += 5;
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status = read_hex_bytes(s, 4, &tmp);
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if (!NT_STATUS_IS_OK(status) || s[4] != '-') {
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return NT_STATUS_INVALID_PARAMETER;
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}
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*time_hi_and_version = tmp;
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s += 5;
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for (i = 0; i < 2; i++) {
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status = read_hex_bytes(s, 2, &tmp);
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if (!NT_STATUS_IS_OK(status)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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clock_seq[i] = tmp;
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s += 2;
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}
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if (s[0] != '-') {
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return NT_STATUS_INVALID_PARAMETER;
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}
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s++;
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for (i = 0; i < 6; i++) {
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status = read_hex_bytes(s, 2, &tmp);
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if (!NT_STATUS_IS_OK(status)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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node[i] = tmp;
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s += 2;
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}
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return NT_STATUS_OK;
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}
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