Commit 1af7965c authored by François Cartegnie's avatar François Cartegnie 🤞

vlc_block_helper: simplify using byte and offset accounting

also removes unused helpers
parent 9f01fccc
/*****************************************************************************
* vlc_block_helper.h: Helper functions for data blocks management.
*****************************************************************************
* Copyright (C) 2003 VLC authors and VideoLAN
* $Id$
* Copyright (C) 2003-2017 VLC authors and VideoLAN
*
* Authors: Gildas Bazin <gbazin@netcourrier.com>
*
......@@ -31,7 +30,9 @@ typedef struct block_bytestream_t
block_t *p_chain; /**< byte stream head block */
block_t **pp_last; /**< tail ppointer for appends */
block_t *p_block; /**< byte stream read pointer block */
size_t i_offset; /**< byte stream read pointer offset within block */
size_t i_block_offset; /**< byte stream read pointer offset within block */
size_t i_base_offset; /**< block base offset (previous blocks total size) */
size_t i_total; /**< total bytes over all linked blocks */
} block_bytestream_t;
/*****************************************************************************
......@@ -41,7 +42,9 @@ static inline void block_BytestreamInit( block_bytestream_t *p_bytestream )
{
p_bytestream->p_chain = p_bytestream->p_block = NULL;
p_bytestream->pp_last = &p_bytestream->p_chain;
p_bytestream->i_offset = 0;
p_bytestream->i_block_offset = 0;
p_bytestream->i_base_offset = 0;
p_bytestream->i_total = 0;
}
static inline void block_BytestreamRelease( block_bytestream_t *p_bytestream )
......@@ -69,17 +72,20 @@ static inline void block_BytestreamFlush( block_bytestream_t *p_bytestream )
{
block_t *p_next = block->p_next;
p_bytestream->i_total -= block->i_buffer;
p_bytestream->i_base_offset -= block->i_buffer;
block_Release( block );
block = p_next;
}
while( block != NULL && block->i_buffer == p_bytestream->i_offset )
while( block != NULL && block->i_buffer == p_bytestream->i_block_offset )
{
block_t *p_next = block->p_next;
p_bytestream->i_total -= block->i_buffer;
block_Release( block );
block = p_next;
p_bytestream->i_offset = 0;
p_bytestream->i_block_offset = 0;
}
p_bytestream->p_chain = p_bytestream->p_block = block;
......@@ -92,6 +98,14 @@ static inline void block_BytestreamPush( block_bytestream_t *p_bytestream,
{
block_ChainLastAppend( &p_bytestream->pp_last, p_block );
if( !p_bytestream->p_block ) p_bytestream->p_block = p_block;
for( ; p_block; p_block = p_block->p_next )
p_bytestream->i_total += p_block->i_buffer;
}
static inline size_t block_BytestreamRemaining( const block_bytestream_t *p_bytestream )
{
return ( p_bytestream->i_total > p_bytestream->i_base_offset + p_bytestream->i_block_offset ) ?
p_bytestream->i_total - p_bytestream->i_base_offset - p_bytestream->i_block_offset : 0;
}
VLC_USED
......@@ -108,9 +122,10 @@ static inline block_t *block_BytestreamPop( block_bytestream_t *p_bytestream )
}
else if( !p_block->p_next )
{
p_block->p_buffer += p_bytestream->i_offset;
p_block->i_buffer -= p_bytestream->i_offset;
p_bytestream->i_offset = 0;
p_block->p_buffer += p_bytestream->i_block_offset;
p_block->i_buffer -= p_bytestream->i_block_offset;
p_bytestream->i_block_offset = 0;
p_bytestream->i_total = 0;
p_bytestream->p_chain = p_bytestream->p_block = NULL;
p_bytestream->pp_last = &p_bytestream->p_chain;
return p_block;
......@@ -123,190 +138,32 @@ static inline block_t *block_BytestreamPop( block_bytestream_t *p_bytestream )
p_block = p_block->p_next;
p_block_old->p_next = NULL;
p_bytestream->pp_last = &p_block_old->p_next;
p_bytestream->i_total -= p_block->i_buffer;
return p_block;
}
static inline int block_SkipByte( block_bytestream_t *p_bytestream )
{
/* Most common case first */
if( likely( p_bytestream->p_block->i_buffer - p_bytestream->i_offset ) )
{
p_bytestream->i_offset++;
return VLC_SUCCESS;
}
else
{
block_t *p_block;
/* Less common case which is also slower */
for( p_block = p_bytestream->p_block->p_next;
p_block != NULL; p_block = p_block->p_next )
{
if( p_block->i_buffer )
{
p_bytestream->i_offset = 1;
p_bytestream->p_block = p_block;
return VLC_SUCCESS;
}
}
}
/* Not enough data, bail out */
return VLC_EGENERIC;
}
static inline int block_PeekByte( block_bytestream_t *p_bytestream,
uint8_t *p_data )
{
/* Most common case first */
if( likely( p_bytestream->p_block->i_buffer - p_bytestream->i_offset ) )
{
*p_data = p_bytestream->p_block->p_buffer[p_bytestream->i_offset];
return VLC_SUCCESS;
}
else
{
block_t *p_block;
/* Less common case which is also slower */
for( p_block = p_bytestream->p_block->p_next;
p_block != NULL; p_block = p_block->p_next )
{
if( p_block->i_buffer )
{
*p_data = p_block->p_buffer[0];
return VLC_SUCCESS;
}
}
}
/* Not enough data, bail out */
return VLC_EGENERIC;
}
static inline int block_GetByte( block_bytestream_t *p_bytestream,
uint8_t *p_data )
{
/* Most common case first */
if( likely( p_bytestream->p_block->i_buffer - p_bytestream->i_offset ) )
{
*p_data = p_bytestream->p_block->p_buffer[p_bytestream->i_offset];
p_bytestream->i_offset++;
return VLC_SUCCESS;
}
else
{
block_t *p_block;
/* Less common case which is also slower */
for( p_block = p_bytestream->p_block->p_next;
p_block != NULL; p_block = p_block->p_next )
{
if( p_block->i_buffer )
{
*p_data = p_block->p_buffer[0];
p_bytestream->i_offset = 1;
p_bytestream->p_block = p_block;
return VLC_SUCCESS;
}
}
}
/* Not enough data, bail out */
return VLC_EGENERIC;
}
static inline int block_WaitBytes( block_bytestream_t *p_bytestream,
size_t i_data )
{
block_t *p_block;
size_t i_offset, i_copy, i_size;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
i_size = i_data;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
i_copy = __MIN( i_size, p_block->i_buffer - i_offset );
i_size -= i_copy;
i_offset = 0;
if( !i_size ) break;
}
if( i_size )
{
/* Not enough data, bail out */
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
static inline int block_SkipBytes( block_bytestream_t *p_bytestream,
size_t i_data )
{
block_t *p_block;
size_t i_offset, i_copy;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
i_copy = 0;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
i_copy = __MIN( i_data, p_block->i_buffer - i_offset );
i_data -= i_copy;
if( !i_data ) break;
i_offset = 0;
}
if( i_data )
{
/* Not enough data, bail out */
return VLC_EGENERIC;
}
p_bytestream->p_block = p_block;
p_bytestream->i_offset = i_offset + i_copy;
return VLC_SUCCESS;
if( block_BytestreamRemaining( p_bytestream ) >= i_data )
return VLC_SUCCESS;
return VLC_EGENERIC;
}
static inline int block_PeekBytes( block_bytestream_t *p_bytestream,
uint8_t *p_data, size_t i_data )
{
block_t *p_block;
size_t i_offset, i_copy, i_size;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
i_size = i_data;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
i_copy = __MIN( i_size, p_block->i_buffer - i_offset );
i_size -= i_copy;
i_offset = 0;
if( !i_size ) break;
}
if( i_size )
{
/* Not enough data, bail out */
if( block_BytestreamRemaining( p_bytestream ) < i_data )
return VLC_EGENERIC;
}
/* Copy the data */
i_offset = p_bytestream->i_offset;
i_size = i_data;
for( p_block = p_bytestream->p_block;
size_t i_offset = p_bytestream->i_block_offset;
size_t i_size = i_data;
for( block_t *p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
i_copy = __MIN( i_size, p_block->i_buffer - i_offset );
size_t i_copy = __MIN( i_size, p_block->i_buffer - i_offset );
i_size -= i_copy;
if( i_copy )
......@@ -326,84 +183,66 @@ static inline int block_PeekBytes( block_bytestream_t *p_bytestream,
static inline int block_GetBytes( block_bytestream_t *p_bytestream,
uint8_t *p_data, size_t i_data )
{
block_t *p_block;
size_t i_offset, i_copy, i_size;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
i_size = i_data;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
i_copy = __MIN( i_size, p_block->i_buffer - i_offset );
i_size -= i_copy;
i_offset = 0;
if( !i_size ) break;
}
if( i_size )
{
/* Not enough data, bail out */
if( block_BytestreamRemaining( p_bytestream ) < i_data )
return VLC_EGENERIC;
}
/* Copy the data */
i_offset = p_bytestream->i_offset;
i_size = i_data;
i_copy = 0;
size_t i_offset = p_bytestream->i_block_offset;
size_t i_size = i_data;
size_t i_copy = 0;
block_t *p_block;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
i_copy = __MIN( i_size, p_block->i_buffer - i_offset );
i_size -= i_copy;
if( i_copy )
if( i_copy && p_data != NULL )
{
memcpy( p_data, p_block->p_buffer + i_offset, i_copy );
p_data += i_copy;
}
if( !i_size ) break;
if( i_size == 0 )
break;
p_bytestream->i_base_offset += p_block->i_buffer;
i_offset = 0;
}
p_bytestream->p_block = p_block;
p_bytestream->i_offset = i_offset + i_copy;
p_bytestream->i_block_offset = i_offset + i_copy;
return VLC_SUCCESS;
}
static inline int block_PeekOffsetBytes( block_bytestream_t *p_bytestream,
size_t i_peek_offset, uint8_t *p_data, size_t i_data )
static inline int block_SkipBytes( block_bytestream_t *p_bytestream,
size_t i_data )
{
block_t *p_block;
size_t i_offset, i_copy, i_size;
/* Check we have that much data */
i_offset = p_bytestream->i_offset;
i_size = i_data + i_peek_offset;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
i_copy = __MIN( i_size, p_block->i_buffer - i_offset );
i_size -= i_copy;
i_offset = 0;
return block_GetBytes( p_bytestream, NULL, i_data );
}
if( !i_size ) break;
}
static inline int block_SkipByte( block_bytestream_t *p_bytestream )
{
return block_GetBytes( p_bytestream, NULL, 1 );
}
if( i_size )
static inline int block_PeekOffsetBytes( block_bytestream_t *p_bytestream,
size_t i_peek_offset, uint8_t *p_data, size_t i_data )
{
/* Check we have that much data, ignoring read offset */
if( p_bytestream->i_total < i_peek_offset ||
p_bytestream->i_total - i_peek_offset < i_data )
{
/* Not enough data, bail out */
return VLC_EGENERIC;
}
/* Find the right place */
i_offset = p_bytestream->i_offset;
i_size = i_peek_offset;
i_copy = 0;
size_t i_offset = p_bytestream->i_block_offset;
size_t i_size = i_peek_offset;
size_t i_copy = 0;
block_t *p_block;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
......@@ -445,12 +284,12 @@ static inline int block_FindStartcodeFromOffset(
block_startcode_helper_t p_startcode_helper )
{
block_t *p_block, *p_block_backup = 0;
int i_size = 0;
ssize_t i_size = 0;
size_t i_offset, i_offset_backup = 0;
int i_caller_offset_backup = 0, i_match;
/* Find the right place */
i_size = *pi_offset + p_bytestream->i_offset;
i_size = *pi_offset + p_bytestream->i_block_offset;
for( p_block = p_bytestream->p_block;
p_block != NULL; p_block = p_block->p_next )
{
......
......@@ -302,7 +302,7 @@ static void dirac_RecoverTimestamps ( decoder_t *p_dec, size_t i_length )
block_t *p_block = p_sys->bytestream.p_block;
/* Find the block with first non-flushed data */
size_t i_offset = p_sys->bytestream.i_offset;
size_t i_offset = p_sys->bytestream.i_block_offset;
for(; p_block != NULL; p_block = p_block->p_next )
{
if( i_offset < p_block->i_buffer )
......
......@@ -169,7 +169,7 @@ static inline block_t *packetizer_Packetize( packetizer_t *p_pack, block_t **pp_
* the data extend up to the end */
block_ChainProperties( p_pack->bytestream.p_chain,
NULL, &p_pack->i_offset, NULL );
p_pack->i_offset -= p_pack->bytestream .i_offset;
p_pack->i_offset -= p_pack->bytestream.i_block_offset;
if( p_pack->i_offset <= (size_t)p_pack->i_startcode )
return NULL;
......
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