mirror of
https://github.com/RfidResearchGroup/ChameleonMini.git
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120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/* Copyright 2013 Timo Kasper, Simon Küppers, David Oswald ("ORIGINAL
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* AUTHORS"). All rights reserved.
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*
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* DEFINITIONS:
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*
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* "WORK": The material covered by this license includes the schematic
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* diagrams, designs, circuit or circuit board layouts, mechanical
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* drawings, documentation (in electronic or printed form), source code,
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* binary software, data files, assembled devices, and any additional
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* material provided by the ORIGINAL AUTHORS in the ChameleonMini project
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* (https://github.com/skuep/ChameleonMini).
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*
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* LICENSE TERMS:
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*
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* Redistributions and use of this WORK, with or without modification, or
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* of substantial portions of this WORK are permitted provided that the
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* following conditions are met:
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*
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* Redistributions and use of this WORK, with or without modification, or
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* of substantial portions of this WORK must include the above copyright
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* notice, this list of conditions, the below disclaimer, and the following
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* attribution:
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*
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* "Based on ChameleonMini an open-source RFID emulator:
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* https://github.com/skuep/ChameleonMini"
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*
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* The attribution must be clearly visible to a user, for example, by being
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* printed on the circuit board and an enclosure, and by being displayed by
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* software (both in binary and source code form).
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*
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* At any time, the majority of the ORIGINAL AUTHORS may decide to give
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* written permission to an entity to use or redistribute the WORK (with or
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* without modification) WITHOUT having to include the above copyright
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* notice, this list of conditions, the below disclaimer, and the above
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* attribution.
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*
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* DISCLAIMER:
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*
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* THIS PRODUCT IS PROVIDED BY THE ORIGINAL AUTHORS "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE ORIGINAL AUTHORS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS PRODUCT, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* The views and conclusions contained in the hardware, software, and
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* documentation should not be interpreted as representing official
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* policies, either expressed or implied, of the ORIGINAL AUTHORS.
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*/
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#include "Common.h"
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uint16_t BufferToHexString(char* HexOut, uint16_t MaxChars, const void* Buffer, uint16_t ByteCount)
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{
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uint8_t* ByteBuffer = (uint8_t*) Buffer;
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uint16_t CharCount = 0;
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/* Account for '\0' at the end */
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MaxChars--;
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while( (ByteCount > 0) && (MaxChars >= 2) ) {
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uint8_t Byte = *ByteBuffer;
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HexOut[0] = NIBBLE_TO_HEXCHAR( (Byte >> 4) & 0x0F );
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HexOut[1] = NIBBLE_TO_HEXCHAR( (Byte >> 0) & 0x0F );
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HexOut += 2;
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MaxChars -= 2;
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CharCount += 2;
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ByteBuffer++;
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ByteCount -= 1;
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}
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*HexOut = '\0';
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return CharCount;
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}
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uint16_t HexStringToBuffer(void* Buffer, uint16_t MaxBytes, const char* HexIn)
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{
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uint8_t* ByteBuffer = (uint8_t*) Buffer;
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uint16_t ByteCount = 0;
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while( (HexIn[0] != '\0') && (HexIn[1] != '\0') && (MaxBytes > 0) ) {
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if (VALID_HEXCHAR(HexIn[0]) && VALID_HEXCHAR(HexIn[1])) {
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uint8_t Byte = 0;
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Byte |= HEXCHAR_TO_NIBBLE(HexIn[0]) << 4;
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Byte |= HEXCHAR_TO_NIBBLE(HexIn[1]) << 0;
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*ByteBuffer = Byte;
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ByteBuffer++;
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MaxBytes--;
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ByteCount++;
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HexIn += 2;
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} else {
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/* HEX chars only */
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return 0;
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}
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}
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if ( (HexIn[0] != '\0') && (HexIn[1] == '\0') ) {
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/* Odd number of characters */
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return 0;
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}
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return ByteCount;
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}
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