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uuid: add strtouuid

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2024-06-18 16:58:22 +02:00
parent 5503a0c339
commit 633d0bd119
1 changed files with 97 additions and 0 deletions
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97
include/stdex/uuid.hpp
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@ -7,6 +7,7 @@
#include "assert.hpp"
#include "compat.hpp"
#include "string.hpp"
#include <stdint.h>
#include <stdio.h>
#if defined(_WIN32)
@ -70,4 +71,100 @@ namespace stdex
static_cast<unsigned int>(id[10]), static_cast<unsigned int>(id[11]), static_cast<unsigned int>(id[12]), static_cast<unsigned int>(id[13]), static_cast<unsigned int>(id[14]), static_cast<unsigned int>(id[15]));
#endif
}
///
/// Parses string for GUID in a form of {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
///
/// \param[in] str String
/// \param[in] count Code unit count limit
/// \param[out] id GUID to read
///
/// \returns true if parse was successful; false otherwise.
///
template <class T> inline _Success_(return != 0) bool strtouuid(
_In_reads_or_z_opt_(count) const T* str,
_In_ size_t count,
_Out_ uuid_t& id)
{
size_t i = 0, j;
uint64_t n;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
if (i >= count || str[i] != '{') return false;
++i;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
n = stdex::strtou64(&str[i], count - i, &j, 16);
if (n > UINT32_MAX) return false;
#ifdef _WIN32
id.Data1 = static_cast<unsigned long>(n);
#else
* reinterpret_cast<const uint32_t*>(&id[0]) = static_cast<uint32_t>(n);
#endif
i += j;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
if (i >= count || str[i] != '-') return false;
++i;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
n = stdex::strtou64(&str[i], count - i, &j, 16);
if (n > UINT16_MAX) return false;
#ifdef _WIN32
id.Data2 = static_cast<unsigned short>(n);
#else
* reinterpret_cast<const uint16_t*>(&id[4]) = static_cast<uint16_t>(n);
#endif
i += j;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
if (i >= count || str[i] != '-') return false;
++i;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
n = stdex::strtou64(&str[i], count - i, &j, 16);
if (n > UINT16_MAX) return false;
#ifdef _WIN32
id.Data3 = static_cast<unsigned short>(n);
#else
* reinterpret_cast<const uint16_t*>(&id[6]) = static_cast<uint16_t>(n);
#endif
i += j;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
if (i >= count || str[i] != '-') return false;
++i;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
n = stdex::strtou64(&str[i], count - i, &j, 16);
if (n > UINT16_MAX) return false;
#ifdef _WIN32
id.Data4[0] = static_cast<unsigned char>((n >> 8) & 0xff);
id.Data4[1] = static_cast<unsigned char>((n) & 0xff);
#else
id[8] = static_cast<unsigned char>((n >> 8) & 0xff);
id[9] = static_cast<unsigned char>((n) & 0xff);
#endif
i += j;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
if (i >= count && str[i] != '-') return false;
++i;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
n = stdex::strtou64(&str[i], count - i, &j, 16);
if (n > 0xffffffffffff) return false;
#ifdef _WIN32
id.Data4[2] = static_cast<unsigned char>((n >> 40) & 0xff);
id.Data4[3] = static_cast<unsigned char>((n >> 32) & 0xff);
id.Data4[4] = static_cast<unsigned char>((n >> 24) & 0xff);
id.Data4[5] = static_cast<unsigned char>((n >> 16) & 0xff);
id.Data4[6] = static_cast<unsigned char>((n >> 8) & 0xff);
id.Data4[7] = static_cast<unsigned char>((n) & 0xff);
#else
id[10] = static_cast<unsigned char>((n >> 40) & 0xff);
id[11] = static_cast<unsigned char>((n >> 32) & 0xff);
id[12] = static_cast<unsigned char>((n >> 24) & 0xff);
id[13] = static_cast<unsigned char>((n >> 16) & 0xff);
id[14] = static_cast<unsigned char>((n >> 8) & 0xff);
id[15] = static_cast<unsigned char>((n) & 0xff);
#endif
i += j;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
if (i >= count || str[i] != '}') return false;
++i;
for (; i < count && str[i] && stdex::isspace(str[i]); ++i);
return i >= count || !str[i];
}
}