mirror of
https://github.com/WinampDesktop/winamp.git
synced 2024-09-24 15:54:12 +00:00
117 lines
2.4 KiB
C++
117 lines
2.4 KiB
C++
#include "ProgressTracker.h"
|
|
#include <stdio.h>
|
|
/* Helper class for managing valid chunks in non-sequential scenarios
|
|
e.g. progressive downloading */
|
|
|
|
ProgressTracker::ProgressTracker()
|
|
{
|
|
current_position=0;
|
|
current_chunk=0;
|
|
chunks[0]=0;
|
|
chunks[null_position]=null_position;
|
|
};
|
|
|
|
void ProgressTracker::Write(uint64_t bytes_written)
|
|
{
|
|
nu::AutoLock list_lock(list_guard);
|
|
ChunkList::iterator next, itr = chunks.find(current_chunk);
|
|
current_position += bytes_written;
|
|
if (itr->second < current_position)
|
|
itr->second = current_position;
|
|
|
|
for (;;)
|
|
{
|
|
next = itr;
|
|
next++;
|
|
if (next != chunks.end() && (next->first <= itr->second))
|
|
{
|
|
itr->second = next->second;
|
|
chunks.erase(next);
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
|
|
bool ProgressTracker::Valid(uint64_t requested_position, uint64_t requested_end, uint64_t *available)
|
|
{
|
|
nu::AutoLock list_lock(list_guard);
|
|
for (ChunkList::iterator itr=chunks.begin();itr!=chunks.end();itr++)
|
|
{
|
|
if (requested_position >= itr->first)
|
|
{
|
|
if (requested_position < itr->second)
|
|
{
|
|
if (available)
|
|
*available = itr->second - requested_position;
|
|
|
|
if (requested_end <= itr->second)
|
|
return true;
|
|
else
|
|
return false;
|
|
|
|
}
|
|
}
|
|
}
|
|
if (available)
|
|
*available = 0;
|
|
return false;
|
|
}
|
|
|
|
bool ProgressTracker::Seek(uint64_t requested_position, uint64_t requested_end, uint64_t *new_start, uint64_t *new_end)
|
|
{
|
|
nu::AutoLock list_lock(list_guard);
|
|
uint64_t last_good_start=0;
|
|
ChunkList::iterator itr;
|
|
for (itr=chunks.begin();itr!=chunks.end();itr++)
|
|
{
|
|
if (requested_position >= itr->first)
|
|
{
|
|
current_chunk = itr->first;
|
|
if (requested_position <= itr->second)
|
|
{
|
|
ChunkList::iterator next = itr;
|
|
next++;
|
|
*new_end = next->first;
|
|
|
|
*new_start = current_position = itr->second;
|
|
|
|
if (requested_end <= itr->second)
|
|
{
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
last_good_start = itr->second;
|
|
}
|
|
}
|
|
}
|
|
if (last_good_start > requested_position)
|
|
*new_start = current_position = last_good_start;
|
|
else
|
|
{
|
|
|
|
*new_start = current_chunk = current_position = requested_position;
|
|
chunks[current_chunk] = current_chunk;
|
|
}
|
|
*new_end = null_position;
|
|
return false;
|
|
}
|
|
|
|
void ProgressTracker::Dump()
|
|
{
|
|
ChunkList::iterator itr;
|
|
for (itr=chunks.begin();itr!=chunks.end();itr++)
|
|
{
|
|
printf("%llu - %llu\n", itr->first, itr->second);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
const uint64_t ProgressTracker::null_position = (uint64_t)-1;
|