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#include <lib/base/buffer.h>
#include <lib/base/eerror.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
void eIOBuffer::removeblock()
{
ASSERT(!buffer.empty());
eIOBufferData &b=buffer.front();
delete[] b.data;
buffer.pop_front();
ptr=0;
}
eIOBuffer::eIOBufferData &eIOBuffer::addblock()
{
eIOBufferData s;
s.data=new __u8[allocationsize];
s.len=0;
buffer.push_back(s);
return buffer.back();
}
eIOBuffer::~eIOBuffer()
{
clear();
}
void eIOBuffer::clear()
{
while (!buffer.empty())
removeblock();
}
int eIOBuffer::size() const
{
int total=0;
for (std::list<eIOBufferData>::const_iterator i(buffer.begin()); i != buffer.end(); ++i)
total+=i->len;
total-=ptr;
return total;
}
int eIOBuffer::empty() const
{
return buffer.empty();
}
int eIOBuffer::peek(void *dest, int len) const
{
__u8 *dst=(__u8*)dest;
std::list<eIOBufferData>::const_iterator i(buffer.begin());
int p=ptr;
int written=0;
while (len)
{
if (i == buffer.end())
break;
int tc=i->len-p;
if (tc > len)
tc = len;
memcpy(dst, i->data+p, tc);
dst+=tc;
written+=tc;
++i;
p=0;
len-=tc;
}
return written;
}
void eIOBuffer::skip(int len)
{
while (len)
{
ASSERT(! buffer.empty());
int tn=len;
if (tn > (buffer.front().len-ptr))
tn=buffer.front().len-ptr;
ptr+=tn;
if (ptr == buffer.front().len)
removeblock();
len-=tn;
}
}
int eIOBuffer::read(void *dest, int len)
{
__u8 *dst=(__u8*)dest;
len=peek(dst, len);
skip(len);
return len;
}
void eIOBuffer::write(const void *source, int len)
{
const __u8 *src=(const __u8*)source;
while (len)
{
int tc=len;
if (buffer.empty() || (allocationsize == buffer.back().len))
addblock();
if (tc > allocationsize-buffer.back().len)
tc=allocationsize-buffer.back().len;
memcpy(buffer.back().data+buffer.back().len, src, tc);
src+=tc;
buffer.back().len+=tc;
len-=tc;
}
}
int eIOBuffer::fromfile(int fd, int len)
{
int re=0;
while (len)
{
int tc=len;
int r;
if (buffer.empty() || (allocationsize == buffer.back().len))
addblock();
if (tc > allocationsize-buffer.back().len)
tc=allocationsize-buffer.back().len;
r=::read(fd, buffer.back().data+buffer.back().len, tc);
buffer.back().len+=r;
len-=r;
if (r < 0)
{
if (errno != EWOULDBLOCK)
eDebug("read: %m");
r=0;
}
re+=r;
if (r != tc)
break;
}
return re;
}
int eIOBuffer::tofile(int fd, int len)
{
int written=0;
int w;
while (len && !buffer.empty())
{
if (buffer.begin() == buffer.end())
break;
int tc=buffer.front().len-ptr;
if (tc > len)
tc = len;
w=::write(fd, buffer.front().data+ptr, tc);
if (w < 0)
{
if (errno != EWOULDBLOCK)
eDebug("write: %m");
w=0;
}
ptr+=w;
if (ptr == buffer.front().len)
removeblock();
written+=w;
len-=w;
if (tc != w)
break;
}
return written;
}
int eIOBuffer::searchchr(char ch) const
{
std::list<eIOBufferData>::const_iterator i(buffer.begin());
int p=ptr;
int c=0;
while (1)
{
if (i == buffer.end())
break;
while (p < i->len)
{
if (i->data[p] == ch)
return c;
else
c++, p++;
}
++i;
p=0;
}
return -1;
}
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