127 lines
2.8 KiB
C++
127 lines
2.8 KiB
C++
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/***************************************************************************************
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*
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* IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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*
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* By downloading, copying, installing or using the software you agree to this license.
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* If you do not agree to this license, do not download, install,
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* copy or use the software.
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*
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* Copyright (C) 2014-2024, Happytimesoft Corporation, all rights reserved.
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*
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* Redistribution and use in binary forms, with or without modification, are permitted.
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*
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* Unless required by applicable law or agreed to in writing, software distributed
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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* CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
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* language governing permissions and limitations under the License.
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*
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****************************************************************************************/
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#include "sys_inc.h"
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#include "mpeg4.h"
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static BOOL mpeg4_get_nibble(char const*& configStr, uint8& resultNibble)
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{
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char c = configStr[0];
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if (c == '\0')
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{
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return FALSE; // we've reached the end
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}
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if (c >= '0' && c <= '9')
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{
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resultNibble = c - '0';
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}
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else if (c >= 'A' && c <= 'F')
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{
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resultNibble = 10 + c - 'A';
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}
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else if (c >= 'a' && c <= 'f')
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{
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resultNibble = 10 + c - 'a';
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}
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else
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{
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return FALSE;
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}
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++configStr; // move to the next nibble
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return TRUE;
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}
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static BOOL mpeg4_get_byte(char const*& configStr, uint8& resultByte)
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{
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resultByte = 0; // by default, in case parsing fails
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uint8 firstNibble;
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if (!mpeg4_get_nibble(configStr, firstNibble))
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{
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return FALSE;
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}
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resultByte = firstNibble << 4;
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uint8 secondNibble = 0;
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if (!mpeg4_get_nibble(configStr, secondNibble) && configStr[0] != '\0')
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{
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// There's a second nibble, but it's malformed
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return FALSE;
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}
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resultByte |= secondNibble;
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return TRUE;
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}
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uint8 * mpeg4_parse_config(char const* configStr, uint32& configSize)
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{
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uint8 * config = NULL;
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do
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{
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if (configStr == NULL)
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{
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break;
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}
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configSize = ((int)strlen(configStr)+1)/2;
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config = (uint8 *) malloc(configSize);
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if (config == NULL)
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{
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break;
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}
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uint32 i;
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for (i = 0; i < configSize; ++i)
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{
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if (!mpeg4_get_byte(configStr, config[i]))
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{
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break;
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}
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}
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if (i != configSize)
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{
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break; // part of the string was bad
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}
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return config;
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} while (0);
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configSize = 0;
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if (config)
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{
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free(config);
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}
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return NULL;
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}
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