# include "config.h"
#endif
-#include <vlc/vlc.h>
+#include <vlc_common.h>
+#include <sys/stat.h>
#include "vlc_block.h"
/*****************************************************************************
free( p_block );
}
+/* Memory alignment */
+#define BLOCK_ALIGN 16
+/* Initial size of reserved header and footer */
#define BLOCK_PADDING_SIZE 32
+/* Maximum size of reserved footer before we release with realloc() */
+#define BLOCK_WASTE_SIZE 2048
block_t *block_Alloc( size_t i_size )
{
/* We do only one malloc
- * TODO bench if doing 2 malloc but keeping a pool of buffer is better
+ * TODO: bench if doing 2 malloc but keeping a pool of buffer is better
+ * TODO: use memalign
* 16 -> align on 16
* 2 * BLOCK_PADDING_SIZE -> pre + post padding
*/
- const size_t i_alloc = i_size + 2 * BLOCK_PADDING_SIZE + 16;
+ const size_t i_alloc = i_size + 2 * BLOCK_PADDING_SIZE + BLOCK_ALIGN;
block_sys_t *p_sys = malloc( sizeof( *p_sys ) + i_alloc );
if( p_sys == NULL )
p_sys->i_allocated_buffer = i_alloc;
block_Init( &p_sys->self, p_sys->p_allocated_buffer + BLOCK_PADDING_SIZE
- + 16 - ((uintptr_t)p_sys->p_allocated_buffer % 16 ), i_size );
+ + BLOCK_ALIGN
+ - ((uintptr_t)p_sys->p_allocated_buffer % BLOCK_ALIGN),
+ i_size );
p_sys->self.pf_release = BlockRelease;
return &p_sys->self;
block_t *block_Realloc( block_t *p_block, ssize_t i_prebody, size_t i_body )
{
block_sys_t *p_sys = (block_sys_t *)p_block;
- ssize_t i_buffer_size;
+ ssize_t i_buffer_size = i_prebody + i_body;
+
+ if( i_buffer_size <= 0 )
+ {
+ block_Release( p_block );
+ return NULL;
+ }
if( p_block->pf_release != BlockRelease )
{
/* Special case when pf_release if overloaded
- * TODO if used one day, them implement it in a smarter way */
+ * TODO if used one day, then implement it in a smarter way */
block_t *p_dup = block_Duplicate( p_block );
block_Release( p_block );
if( !p_dup )
p_block = p_dup;
}
- i_buffer_size = i_prebody + i_body;
-
- if( i_buffer_size <= 0 )
- {
- block_Release( p_block );
- return NULL;
- }
-
+ /* Adjust reserved header if there is enough room */
if( p_block->p_buffer - i_prebody > p_sys->p_allocated_buffer &&
p_block->p_buffer - i_prebody < p_sys->p_allocated_buffer +
p_sys->i_allocated_buffer )
p_block->i_buffer += i_prebody;
i_prebody = 0;
}
+
+ /* Adjust payload size if there is enough room */
if( p_block->p_buffer + i_body < p_sys->p_allocated_buffer +
p_sys->i_allocated_buffer )
{
i_body = 0;
}
+ /* Not enough room, reallocate the buffer */
if( i_body > 0 || i_prebody > 0 )
{
+ /* FIXME: this is really dumb, we should use realloc() */
block_t *p_rea = block_New( NULL, i_buffer_size );
if( p_rea )
return p_rea;
}
+ /* We have a very large reserved footer now? Release some of it. */
+ if ((p_sys->p_allocated_buffer + p_sys->i_allocated_buffer) -
+ (p_block->p_buffer + p_block->i_buffer) > BLOCK_WASTE_SIZE)
+ {
+ const size_t news = p_block->i_buffer + 2 * BLOCK_PADDING_SIZE + 16;
+ block_sys_t *newb = realloc (p_sys, sizeof (*p_sys) + news);
+
+ if (newb != NULL)
+ {
+ p_sys = newb;
+ p_sys->i_allocated_buffer = news;
+ p_block = &p_sys->self;
+ p_block->p_buffer = p_sys->p_allocated_buffer + BLOCK_PADDING_SIZE
+ + BLOCK_ALIGN
+ - ((uintptr_t)p_sys->p_allocated_buffer % BLOCK_ALIGN);
+ }
+ }
+
return p_block;
}
free (p_sys);
}
+/**
+ * Creates a block from a virtual address memory mapping (mmap).
+ * This is provided by LibVLC so that mmap blocks can safely be deallocated
+ * even after the allocating plugin has been unloaded from memory.
+ *
+ * @param addr base address of the mapping (as returned by mmap)
+ * @param length length (bytes) of the mapping (as passed to mmap)
+ * @return NULL if addr is MAP_FAILED, or an error occurred (in the later
+ * case, munmap(addr, length) is invoked before returning).
+ */
block_t *block_mmap_Alloc (void *addr, size_t length)
{
if (addr == MAP_FAILED)
block->length = length;
return &block->self;
}
+#else
+block_t *block_mmap_Alloc (void *addr, size_t length)
+{
+ (void)addr; (void)length; return NULL;
+}
#endif
+
+#ifdef WIN32
+static
+ssize_t pread (int fd, void *buf, size_t count, off_t offset)
+{
+ HANDLE handle = (HANDLE)(intptr_t)_get_osfhandle (fd);
+ if (handle == INVALID_HANDLE_VALUE)
+ return -1;
+
+ OVERLAPPED olap = { .Offset = offset, .OffsetHigh = (offset >> 32), };
+ DWORD written;
+ /* This braindead API will override the file pointer even if we specify
+ * an explicit read offset... So do not expect this to mix well with
+ * regular read() calls. */
+ if (ReadFile (handle, buf, count, &written, &olap))
+ return written;
+ return -1;
+}
+#endif
+
+/**
+ * Loads a file into a block of memory. If possible a private file mapping is
+ * created. Otherwise, the file is read normally. On 32-bits platforms, this
+ * function will not work for very large files, due to memory space
+ * constraints.
+ *
+ * @param fd file descriptor to load from
+ * @return a new block with the file content at p_buffer, and file length at
+ * i_buffer (release it with block_Release()), or NULL upon error (see errno).
+ */
+block_t *block_File (int fd)
+{
+ size_t length;
+ struct stat st;
+
+ /* First, get the file size */
+ if (fstat (fd, &st))
+ return NULL;
+
+ /* st_size is meaningful for regular files, shared memory and typed memory.
+ * It's also meaning for symlinks, but that's not possible with fstat().
+ * In other cases, it's undefined, and we should really not go further. */
+#ifndef S_TYPEISSHM
+# define S_TYPEISSHM( buf ) (0)
+#endif
+ if (S_ISDIR (st.st_mode))
+ {
+ errno = EISDIR;
+ return NULL;
+ }
+ if (!S_ISREG (st.st_mode) && !S_TYPEISSHM (&st))
+ {
+ errno = ESPIPE;
+ return NULL;
+ }
+
+ /* Prevent an integer overflow in mmap() and malloc() */
+ if (st.st_size >= SIZE_MAX)
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+ length = (size_t)st.st_size;
+
+#ifdef HAVE_MMAP
+ if (length > 0)
+ {
+ void *addr;
+
+ addr = mmap (NULL, length, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+ if (addr != MAP_FAILED)
+ return block_mmap_Alloc (addr, length);
+ }
+#endif
+
+ /* If mmap() is not implemented by the OS _or_ the filesystem... */
+ block_t *block = block_Alloc (length);
+ if (block == NULL)
+ return NULL;
+
+ for (size_t i = 0; i < length;)
+ {
+ ssize_t len = pread (fd, block->p_buffer + i, length - i, i);
+ if (len == -1)
+ {
+ block_Release (block);
+ return NULL;
+ }
+ i += len;
+ }
+ return block;
+}
+
/*****************************************************************************
* block_fifo_t management
*****************************************************************************/
block_t **pp_last;
size_t i_depth;
size_t i_size;
- vlc_bool_t b_force_wake;
+ bool b_force_wake;
};
-block_fifo_t *__block_FifoNew( vlc_object_t *p_obj )
+block_fifo_t *block_FifoNew( void )
{
- block_fifo_t *p_fifo;
+ block_fifo_t *p_fifo = malloc( sizeof( block_fifo_t ) );
+ if( !p_fifo )
+ return NULL;
- p_fifo = malloc( sizeof( block_fifo_t ) );
- if( !p_fifo ) return NULL;
- vlc_mutex_init( p_obj, &p_fifo->lock );
- vlc_cond_init( p_obj, &p_fifo->wait );
+ vlc_mutex_init( &p_fifo->lock );
+ vlc_cond_init( NULL, &p_fifo->wait );
p_fifo->p_first = NULL;
p_fifo->pp_last = &p_fifo->p_first;
p_fifo->i_depth = p_fifo->i_size = 0;
- p_fifo->b_force_wake = VLC_FALSE;
+ p_fifo->b_force_wake = false;
return p_fifo;
}
{
vlc_mutex_lock( &p_fifo->lock );
if( p_fifo->p_first == NULL )
- p_fifo->b_force_wake = VLC_TRUE;
+ p_fifo->b_force_wake = true;
vlc_cond_signal( &p_fifo->wait );
vlc_mutex_unlock( &p_fifo->lock );
}
b = p_fifo->p_first;
- p_fifo->b_force_wake = VLC_FALSE;
+ p_fifo->b_force_wake = false;
if( b == NULL )
{
/* Forced wakeup */
projects / vlc / blobdiff