transmission/libtransmission/utils.h

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/******************************************************************************
* $Id$
*
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* Copyright (c) 2005-2007 Transmission authors and contributors
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*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#ifndef TR_UTILS_H
#define TR_UTILS_H 1
void tr_msgInit( void );
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#define tr_err( a... ) tr_msg( TR_MSG_ERR, ## a )
#define tr_inf( a... ) tr_msg( TR_MSG_INF, ## a )
#define tr_dbg( a... ) tr_msg( TR_MSG_DBG, ## a )
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void tr_msg ( int level, char * msg, ... ) PRINTF( 2, 3 );
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int tr_rand ( int );
void * tr_memmem( const void *, size_t, const void *, size_t );
/***********************************************************************
* tr_mkdir
***********************************************************************
* Create a directory and any needed parent directories.
* Note that the string passed in must be writable!
**********************************************************************/
int tr_mkdir( char * path );
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/***********************************************************************
* tr_strcasecmp
***********************************************************************
* A case-insensitive strncmp()
**********************************************************************/
#define tr_strcasecmp( ff, ss ) ( tr_strncasecmp( (ff), (ss), -1 ) )
int tr_strncasecmp( const char * first, const char * second, int len );
/***********************************************************************
* tr_sprintf
***********************************************************************
* Appends to the end of a buffer using printf formatting,
* growing the buffer if needed
**********************************************************************/
int tr_sprintf( char ** buf, int * used, int * max,
const char * format, ... ) PRINTF( 4, 5 );
/* gee, it sure would be nice if BeOS had va_copy() */
int tr_vsprintf( char **, int *, int *, const char *, va_list, va_list );
/* this concatenates some binary data onto the end of a buffer */
int tr_concat( char ** buf, int * used, int * max,
const char * data, int len );
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/***********************************************************************
* tr_dupstr
***********************************************************************
* Creates a nul-terminated string
**********************************************************************/
char * tr_dupstr( const char * base, int len );
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int tr_ioErrorFromErrno( void );
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char * tr_errorString( int code );
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/***********************************************************************
* tr_date
***********************************************************************
* Returns the current date in milliseconds
**********************************************************************/
static inline uint64_t tr_date()
{
struct timeval tv;
gettimeofday( &tv, NULL );
return (uint64_t) tv.tv_sec * 1000 + ( tv.tv_usec / 1000 );
}
/***********************************************************************
* tr_wait
***********************************************************************
* Wait 'delay' milliseconds
**********************************************************************/
static inline void tr_wait( uint64_t delay )
{
#ifdef SYS_BEOS
snooze( 1000 * delay );
#else
usleep( 1000 * delay );
#endif
}
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struct tr_bitfield_s
{
uint8_t * bits;
int len;
};
/* note that the argument is how many bits are needed, not bytes */
static inline tr_bitfield_t * tr_bitfieldNew( int bitcount )
{
tr_bitfield_t * ret;
ret = calloc( 1, sizeof *ret );
if( NULL == ret )
{
return NULL;
}
ret->len = ( bitcount + 7 ) / 8;
ret->bits = calloc( ret->len, 1 );
if( NULL == ret->bits )
{
free( ret );
return NULL;
}
return ret;
}
static inline void tr_bitfieldFree( tr_bitfield_t * bitfield )
{
if( bitfield )
{
free( bitfield->bits );
free( bitfield );
}
}
static inline void tr_bitfieldClear( tr_bitfield_t * bitfield )
{
memset( bitfield->bits, 0, bitfield->len );
}
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/***********************************************************************
* tr_bitfieldHas
**********************************************************************/
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static inline int tr_bitfieldHas( tr_bitfield_t * bitfield, int piece )
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{
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assert( piece / 8 < bitfield->len );
return ( bitfield->bits[ piece / 8 ] & ( 1 << ( 7 - ( piece % 8 ) ) ) );
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}
/***********************************************************************
* tr_bitfieldAdd
**********************************************************************/
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static inline void tr_bitfieldAdd( tr_bitfield_t * bitfield, int piece )
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{
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assert( piece / 8 < bitfield->len );
bitfield->bits[ piece / 8 ] |= ( 1 << ( 7 - ( piece % 8 ) ) );
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}
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static inline void tr_bitfieldRem( tr_bitfield_t * bitfield, int piece )
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{
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assert( piece / 8 < bitfield->len );
bitfield->bits[ piece / 8 ] &= ~( 1 << ( 7 - ( piece % 8 ) ) );
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}
#define tr_blockPiece(a) _tr_blockPiece(tor,a)
static inline int _tr_blockPiece( tr_torrent_t * tor, int block )
{
tr_info_t * inf = &tor->info;
return block / ( inf->pieceSize / tor->blockSize );
}
#define tr_blockSize(a) _tr_blockSize(tor,a)
static inline int _tr_blockSize( tr_torrent_t * tor, int block )
{
tr_info_t * inf = &tor->info;
int dummy;
if( block != tor->blockCount - 1 ||
!( dummy = inf->totalSize % tor->blockSize ) )
{
return tor->blockSize;
}
return dummy;
}
#define tr_blockPosInPiece(a) _tr_blockPosInPiece(tor,a)
static inline int _tr_blockPosInPiece( tr_torrent_t * tor, int block )
{
tr_info_t * inf = &tor->info;
return tor->blockSize *
( block % ( inf->pieceSize / tor->blockSize ) );
}
#define tr_pieceCountBlocks(a) _tr_pieceCountBlocks(tor,a)
static inline int _tr_pieceCountBlocks( tr_torrent_t * tor, int piece )
{
tr_info_t * inf = &tor->info;
if( piece < inf->pieceCount - 1 ||
!( tor->blockCount % ( inf->pieceSize / tor->blockSize ) ) )
{
return inf->pieceSize / tor->blockSize;
}
return tor->blockCount % ( inf->pieceSize / tor->blockSize );
}
#define tr_pieceStartBlock(a) _tr_pieceStartBlock(tor,a)
static inline int _tr_pieceStartBlock( tr_torrent_t * tor, int piece )
{
tr_info_t * inf = &tor->info;
return piece * ( inf->pieceSize / tor->blockSize );
}
#define tr_pieceSize(a) _tr_pieceSize(tor,a)
static inline int _tr_pieceSize( tr_torrent_t * tor, int piece )
{
tr_info_t * inf = &tor->info;
if( piece < inf->pieceCount - 1 ||
!( inf->totalSize % inf->pieceSize ) )
{
return inf->pieceSize;
}
return inf->totalSize % inf->pieceSize;
}
#define tr_block(a,b) _tr_block(tor,a,b)
static inline int _tr_block( tr_torrent_t * tor, int index, int begin )
{
tr_info_t * inf = &tor->info;
return index * ( inf->pieceSize / tor->blockSize ) +
begin / tor->blockSize;
}
#endif