90 lines
1.7 KiB
C
90 lines
1.7 KiB
C
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#ifndef NULLSOFT_FLVUTIL_H
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#define NULLSOFT_FLVUTIL_H
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#include <memory.h>
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#include <bfc/platform/types.h>
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namespace FLV
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{
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// reads 32 bits from data and converts from big endian
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inline uint32_t Read32(uint8_t *data)
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{
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uint32_t returnVal;
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#ifdef __BIG_ENDIAN__
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returnVal = *(uint32_t *)(&data[0]);
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#else
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// need to swap endianness
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uint8_t *swap = (uint8_t *)&returnVal;
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swap[0]=data[3];
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swap[1]=data[2];
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swap[2]=data[1];
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swap[3]=data[0];
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#endif
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return returnVal;
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}
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// reads 24 bits from data, converts from big endian, and returns as a 32bit int
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inline uint32_t Read24(uint8_t *data)
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{
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uint32_t returnVal=0;
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uint8_t *swap = (uint8_t *)&returnVal;
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#ifdef __BIG_ENDIAN__
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swap[1]=data[0];
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swap[2]=data[1];
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swap[3]=data[2];
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returnVal = *(uint32_t *)(&data[0]);
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#else
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// need to swap endianness
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swap[0]=data[2];
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swap[1]=data[1];
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swap[2]=data[0];
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#endif
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return returnVal;
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}
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// reads 16 bits from data and converts from big endian
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inline uint16_t Read16(uint8_t *data)
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{
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uint16_t returnVal;
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#ifdef __BIG_ENDIAN__
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returnVal = *(uint16_t *)(&data[0]);
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#else
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// need to swap endianness
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uint8_t *swap = (uint8_t *)&returnVal;
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swap[0]=data[1];
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swap[1]=data[0];
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#endif
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return returnVal;
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}
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// reads 16 bits from data and converts from big endian
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inline uint8_t Read8(uint8_t *data)
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{
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uint8_t returnVal;
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returnVal = *(uint8_t *)(&data[0]);
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return returnVal;
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}
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// reads a double from data
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inline double ReadDouble(uint8_t *data)
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{
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double returnVal;
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#ifdef __BIG_ENDIAN__
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memcpy(&returnVal, data, 8);
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#else
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uint8_t *swap = (uint8_t *)&returnVal;
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swap[0]=data[7];
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swap[1]=data[6];
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swap[2]=data[5];
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swap[3]=data[4];
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swap[4]=data[3];
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swap[5]=data[2];
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swap[6]=data[1];
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swap[7]=data[0];
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#endif
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return returnVal;
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}
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}
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#endif
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