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#define CVAL(buf,pos) (((uint8_t *)(buf))[pos])
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#define PVAL(buf,pos) ((uint_t)CVAL(buf,pos))
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#define PVAL(buf,pos) ((unsigned int)CVAL(buf,pos))
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#define SVAL(buf,pos) (PVAL(buf,pos)|PVAL(buf,(pos)+1)<<8)
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then to extract a uint16_t value at offset 25 in a buffer you do this:
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#define CAREFUL_ALIGNMENT 1
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#define CVAL(buf,pos) ((uint_t)(((const uint8_t *)(buf))[pos]))
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#define CVAL(buf,pos) ((unsigned int)(((const uint8_t *)(buf))[pos]))
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#define CVAL_NC(buf,pos) (((uint8_t *)(buf))[pos]) /* Non-const version of CVAL */
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#define PVAL(buf,pos) (CVAL(buf,pos))
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#define SCVAL(buf,pos,val) (CVAL_NC(buf,pos) = (val))
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/* get single value from an SMB buffer */
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#define SVAL(buf,pos) (*(const uint16_t *)((const char *)(buf) + (pos)))
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#define SVAL_NC(buf,pos) (*(uint16_t *)((char *)(buf) + (pos))) /* Non const version of above. */
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#define SVAL_NC(buf,pos) (*(uint16_t *)((void *)((char *)(buf) + (pos)))) /* Non const version of above. */
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#define IVAL(buf,pos) (*(const uint32_t *)((const char *)(buf) + (pos)))
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#define IVAL_NC(buf,pos) (*(uint32_t *)((char *)(buf) + (pos))) /* Non const version of above. */
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#define IVAL_NC(buf,pos) (*(uint32_t *)((void *)((char *)(buf) + (pos)))) /* Non const version of above. */
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#define SVALS(buf,pos) (*(const int16_t *)((const char *)(buf) + (pos)))
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#define SVALS_NC(buf,pos) (*(int16_t *)((char *)(buf) + (pos))) /* Non const version of above. */
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#define SVALS_NC(buf,pos) (*(int16_t *)((void *)((char *)(buf) + (pos)))) /* Non const version of above. */
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#define IVALS(buf,pos) (*(const int32_t *)((const char *)(buf) + (pos)))
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#define IVALS_NC(buf,pos) (*(int32_t *)((char *)(buf) + (pos))) /* Non const version of above. */
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#define IVALS_NC(buf,pos) (*(int32_t *)((void *)((char *)(buf) + (pos)))) /* Non const version of above. */
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/* store single value in an SMB buffer */
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#define SSVAL(buf,pos,val) SVAL_NC(buf,pos)=((uint16_t)(val))
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#endif /* not CAREFUL_ALIGNMENT */
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#define BVAL(p, ofs) (IVAL(p,ofs) | (((uint64_t)IVAL(p,(ofs)+4)) << 32))
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#define BVALS(p, ofs) ((int64_t)BVAL(p,ofs))
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#define SBVAL(p, ofs, v) (SIVAL(p,ofs,(v)&0xFFFFFFFF), SIVAL(p,(ofs)+4,((uint64_t)(v))>>32))
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#define SBVALS(p, ofs, v) (SBVAL(p,ofs,(uint64_t)v))
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/* now the reverse routines - these are used in nmb packets (mostly) */
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#define SREV(x) ((((x)&0xFF)<<8) | (((x)>>8)&0xFF))
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#define IREV(x) ((SREV(x)<<16) | (SREV((x)>>16)))
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#define BREV(x) ((IREV(x)<<32) | (IREV((x)>>32)))
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#define RSVAL(buf,pos) SREV(SVAL(buf,pos))
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#define RSVALS(buf,pos) SREV(SVALS(buf,pos))
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#define RIVAL(buf,pos) IREV(IVAL(buf,pos))
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#define RIVALS(buf,pos) IREV(IVALS(buf,pos))
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#define RBVAL(buf,pos) BREV(BVAL(buf,pos))
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#define RBVALS(buf,pos) BREV(BVALS(buf,pos))
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#define RSSVAL(buf,pos,val) SSVAL(buf,pos,SREV(val))
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#define RSSVALS(buf,pos,val) SSVALS(buf,pos,SREV(val))
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#define RSIVAL(buf,pos,val) SIVAL(buf,pos,IREV(val))
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#define RSIVALS(buf,pos,val) SIVALS(buf,pos,IREV(val))
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#define RSBVAL(buf,pos,val) SBVAL(buf,pos,BREV(val))
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#define RSBVALS(buf,pos,val) SBVALS(buf,pos,BREV(val))
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/* Alignment macros. */
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#define ALIGN4(p,base) ((p) + ((4 - (PTR_DIFF((p), (base)) & 3)) & 3))
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/* macros for accessing SMB protocol elements */
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#define VWV(vwv) ((vwv)*2)
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#define BVAL(p, ofs) (IVAL(p,ofs) | (((uint64_t)IVAL(p,(ofs)+4)) << 32))
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#define BVALS(p, ofs) ((int64_t)BVAL(p,ofs))
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#define SBVAL(p, ofs, v) (SIVAL(p,ofs,(v)&0xFFFFFFFF), SIVAL(p,(ofs)+4,((uint64_t)(v))>>32))
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#define SBVALS(p, ofs, v) (SBVAL(p,ofs,(uint64_t)v))
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#endif /* _BYTEORDER_H */