mirror of https://github.com/encounter/SDL.git
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#include "SDL_guid.h"
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/* convert the guid to a printable string */
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void SDL_GUIDToString(SDL_GUID guid, char *pszGUID, int cbGUID)
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{
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static const char k_rgchHexToASCII[] = "0123456789abcdef";
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int i;
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if ((pszGUID == NULL) || (cbGUID <= 0)) {
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return;
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}
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for (i = 0; i < sizeof(guid.data) && i < (cbGUID-1)/2; i++) {
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/* each input byte writes 2 ascii chars, and might write a null byte. */
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/* If we don't have room for next input byte, stop */
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unsigned char c = guid.data[i];
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*pszGUID++ = k_rgchHexToASCII[c >> 4];
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*pszGUID++ = k_rgchHexToASCII[c & 0x0F];
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}
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*pszGUID = '\0';
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}
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/*-----------------------------------------------------------------------------
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* Purpose: Returns the 4 bit nibble for a hex character
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* Input : c -
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* Output : unsigned char
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*-----------------------------------------------------------------------------*/
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static unsigned char nibble(unsigned char c)
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{
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if ((c >= '0') && (c <= '9')) {
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return (c - '0');
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}
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if ((c >= 'A') && (c <= 'F')) {
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return (c - 'A' + 0x0a);
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}
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if ((c >= 'a') && (c <= 'f')) {
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return (c - 'a' + 0x0a);
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}
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/* received an invalid character, and no real way to return an error */
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/* AssertMsg1(false, "Q_nibble invalid hex character '%c' ", c); */
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return 0;
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}
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/* convert the string version of a guid to the struct */
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SDL_GUID SDL_GUIDFromString(const char *pchGUID)
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{
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SDL_GUID guid;
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int maxoutputbytes= sizeof(guid);
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size_t len = SDL_strlen(pchGUID);
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Uint8 *p;
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size_t i;
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/* Make sure it's even */
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len = (len) & ~0x1;
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SDL_memset(&guid, 0x00, sizeof(guid));
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p = (Uint8 *)&guid;
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for (i = 0; (i < len) && ((p - (Uint8 *)&guid) < maxoutputbytes); i+=2, p++) {
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*p = (nibble((unsigned char)pchGUID[i]) << 4) | nibble((unsigned char)pchGUID[i+1]);
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}
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return guid;
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}
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