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75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
/*******************************************************************************
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* common.h: common definitions
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* (c)1998 VideoLAN
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*******************************************************************************
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* Collection of usefull common types and macros definitions
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*******************************************************************************
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* required headers:
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* config.h
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*******************************************************************************/
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/*******************************************************************************
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* Types definitions
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*******************************************************************************/
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/* Basic types definitions */
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typedef signed char s8;
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typedef signed short s16;
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typedef signed int s32;
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typedef signed long long s64;
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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typedef u8 byte_t;
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/* Boolean type */
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typedef int boolean_t;
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/* Counter for statistics and profiling */
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typedef unsigned long count_t;
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/*******************************************************************************
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* Macros and inline functions
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*******************************************************************************/
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/* CEIL: division with round to nearest greater integer */
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#define CEIL(n, d) ( ((n) / (d)) + ( ((n) % (d)) ? 1 : 0) )
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/* PAD: PAD(n, d) = CEIL(n ,d) * d */
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#define PAD(n, d) ( ((n) % (d)) ? ((((n) / (d)) + 1) * (d)) : (n) )
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/* MAX and MIN: self explanatory */
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#define MAX(a, b) ( ((a) > (b)) ? (a) : (b) )
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#define MIN(a, b) ( ((a) < (b)) ? (a) : (b) )
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/* MSB (big endian)/LSB (little endian) convertions - network order is always
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* MSB, and should be used for both network communications and files. Note that
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* byte orders other than little and big endians are not supported, but only
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* the VAX seems to have such exotic properties - note that these 'functions'
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* needs <netinet/in.h> or the local equivalent. */
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/* ?? hton64 should be declared as an extern inline function to avoid border
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* effects (see byteorder.h) */
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define hton16 htons
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#define hton32 htonl
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#define hton64(i) ( ((u64)(htonl((i) & 0xffffffff)) << 32) | htonl(((i) >> 32) & 0xffffffff ) )
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#define ntoh16 ntohs
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#define ntoh32 ntohl
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#define ntoh64 hton64
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#elif __BYTE_ORDER == __BIG_ENDIAN
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#define hton16 htons
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#define hton32 htonl
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#define hton64(i) ( i )
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#define ntoh16 ntohs
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#define ntoh32 ntohl
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#define ntoh64(i) ( i )
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#else
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/* ?? cause a compilation error */
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#endif
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/* Macros used by input to access the TS buffer */
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#define U32_AT(p) ( ntohl ( *( (u32 *)(p) ) ) )
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#define U16_AT(p) ( ntohs ( *( (u16 *)(p) ) ) )
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