mirror of https://github.com/encounter/SDL.git
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
|
|
Simple DirectMedia Layer
|
|
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
#include "SDL_internal.h"
|
|
|
|
|
|
#include "SDL_guid.h"
|
|
|
|
/* convert the guid to a printable string */
|
|
void SDL_GUIDToString(SDL_GUID guid, char *pszGUID, int cbGUID)
|
|
{
|
|
static const char k_rgchHexToASCII[] = "0123456789abcdef";
|
|
int i;
|
|
|
|
if ((pszGUID == NULL) || (cbGUID <= 0)) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < sizeof(guid.data) && i < (cbGUID-1)/2; i++) {
|
|
/* each input byte writes 2 ascii chars, and might write a null byte. */
|
|
/* If we don't have room for next input byte, stop */
|
|
unsigned char c = guid.data[i];
|
|
|
|
*pszGUID++ = k_rgchHexToASCII[c >> 4];
|
|
*pszGUID++ = k_rgchHexToASCII[c & 0x0F];
|
|
}
|
|
*pszGUID = '\0';
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* Purpose: Returns the 4 bit nibble for a hex character
|
|
* Input : c -
|
|
* Output : unsigned char
|
|
*-----------------------------------------------------------------------------*/
|
|
static unsigned char nibble(unsigned char c)
|
|
{
|
|
if ((c >= '0') && (c <= '9')) {
|
|
return (c - '0');
|
|
}
|
|
|
|
if ((c >= 'A') && (c <= 'F')) {
|
|
return (c - 'A' + 0x0a);
|
|
}
|
|
|
|
if ((c >= 'a') && (c <= 'f')) {
|
|
return (c - 'a' + 0x0a);
|
|
}
|
|
|
|
/* received an invalid character, and no real way to return an error */
|
|
/* AssertMsg1(false, "Q_nibble invalid hex character '%c' ", c); */
|
|
return 0;
|
|
}
|
|
|
|
/* convert the string version of a guid to the struct */
|
|
SDL_GUID SDL_GUIDFromString(const char *pchGUID)
|
|
{
|
|
SDL_GUID guid;
|
|
int maxoutputbytes= sizeof(guid);
|
|
size_t len = SDL_strlen(pchGUID);
|
|
Uint8 *p;
|
|
size_t i;
|
|
|
|
/* Make sure it's even */
|
|
len = (len) & ~0x1;
|
|
|
|
SDL_memset(&guid, 0x00, sizeof(guid));
|
|
|
|
p = (Uint8 *)&guid;
|
|
for (i = 0; (i < len) && ((p - (Uint8 *)&guid) < maxoutputbytes); i+=2, p++) {
|
|
*p = (nibble((unsigned char)pchGUID[i]) << 4) | nibble((unsigned char)pchGUID[i+1]);
|
|
}
|
|
|
|
return guid;
|
|
}
|