| /* |
| 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; |
| } |