checkpoint debugging of stream buffer.

This commit is contained in:
crs 2002-05-02 11:33:34 +00:00
parent eb2a202834
commit 76269a48c1
1 changed files with 32 additions and 12 deletions

View File

@ -38,64 +38,84 @@ const void* CStreamBuffer::peek(UInt32 n)
void CStreamBuffer::pop(UInt32 n)
{
// discard all chunks if n is greater than or equal to m_size
if (n >= m_size) {
m_size = 0;
m_chunks.clear();
return;
}
// update size
m_size -= n;
// discard chunks until more than n bytes would've been discarded
ChunkList::iterator scan = m_chunks.begin();
while (scan->size() <= n && scan != m_chunks.end()) {
assert(scan != m_chunks.end());
while (scan->size() <= n) {
n -= scan->size();
scan = m_chunks.erase(scan);
assert(scan != m_chunks.end());
}
assert(n > 0);
// if there's anything left over then remove it from the head chunk.
// if there's no head chunk then we're already empty.
if (scan == m_chunks.end()) {
m_size = 0;
}
else if (n > 0) {
// remove left over bytes from the head chunk
scan->erase(scan->begin(), scan->begin() + n);
}
}
#include "CLog.h"
void CStreamBuffer::write(
const void* vdata, UInt32 n)
{
assert(vdata != NULL);
// ignore if no data, otherwise update size
if (n == 0) {
return;
}
log((CLOG_DEBUG "### %p buffering %d bytes onto %d bytes", this, n, m_size));
m_size += n;
// cast data to bytes
const UInt8* data = reinterpret_cast<const UInt8*>(vdata);
if (n > 1000)
log((CLOG_DEBUG "### %p src: %u %u %u %u %u %u %u %u", this,
data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7]));
// point to last chunk if it has space, otherwise append an empty chunk
ChunkList::iterator scan = m_chunks.end();
if (scan != m_chunks.begin()) {
log((CLOG_DEBUG "### %p at least one chunk", this));
--scan;
if (scan->size() >= kChunkSize)
{
log((CLOG_DEBUG "### %p last chunk full", this));
++scan;
}
}
if (scan == m_chunks.end()) {
scan = m_chunks.insert(scan);
log((CLOG_DEBUG "### %p append chunk", this));
scan = m_chunks.insert(scan, Chunk());
}
// append data in chunks
while (n > 0) {
// choose number of bytes for next chunk
assert(scan->size() <= kChunkSize);
UInt32 count = kChunkSize - scan->size();
if (count > n)
count = n;
// transfer data
log((CLOG_DEBUG "### %p append %d bytes onto last chunk", this, count));
scan->insert(scan->end(), data, data + count);
n -= count;
data += count;
// append another empty chunk if we're not done yet
if (n > 0) {
scan = m_chunks.insert(scan);
++scan;
scan = m_chunks.insert(scan, Chunk());
log((CLOG_DEBUG "### %p append chunk2", this));
}
}
}