#include "serialise.hh"
#include "util.hh"

#include <cstring>
#include <cerrno>


namespace nix {


BufferedSink::~BufferedSink()
{
    /* We can't call flush() here, because C++ for some insane reason
       doesn't allow you to call virtual methods from a destructor. */
    assert(!bufPos);
    delete[] buffer;
}

    
void BufferedSink::operator () (const unsigned char * data, size_t len)
{
    if (!buffer) buffer = new unsigned char[bufSize];
    
    while (len) {
        /* Optimisation: bypass the buffer if the data exceeds the
           buffer size. */
        if (bufPos + len >= bufSize) {
            flush();
            write(data, len);
            break;
        }
        /* Otherwise, copy the bytes to the buffer.  Flush the buffer
           when it's full. */
        size_t n = bufPos + len > bufSize ? bufSize - bufPos : len;
        memcpy(buffer + bufPos, data, n);
        data += n; bufPos += n; len -= n;
        if (bufPos == bufSize) flush();
    }
}


void BufferedSink::flush()
{
    if (</td></tr></table>
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gned int i = 0; i < n; i++)
            if (zero[i]) throw SerialisationError("non-zero padding");
    }
}


unsigned int readInt(Source & source)
{
    unsigned char buf[8];
    source(buf, sizeof(buf));
    if (buf[4] || buf[5] || buf[6] || buf[7])
        throw SerialisationError("implementation cannot deal with > 32-bit integers");
    return
        buf[0] |
        (buf[1] << 8) |
        (buf[2] << 16) |
        (buf[3] << 24);
}


unsigned long long readLongLong(Source & source)
{
    unsigned char buf[8];
    source(buf, sizeof(buf));
    return
        ((unsigned long long) buf[0]) |
        ((unsigned long long) buf[1] << 8) |
        ((unsigned long long) buf[2] << 16) |
        ((unsigned long long) buf[3] << 24) |
        ((unsigned long long) buf[4] << 32) |
        ((unsigned long long) buf[5] << 40) |
        ((unsigned long long) buf[6] << 48) |
        ((unsigned long long) buf[7] << 56);
}


size_t readString(unsigned char * buf, size_t max, Source & source)
{
    size_t len = readInt(source);
    if (len > max) throw Error("string is too long");
    source(buf, len);
    readPadding(len, source);
    return len;
}

 
string readString(Source & source)
{
    size_t len = readInt(source);
    unsigned char * buf = new unsigned char[len];
    AutoDeleteArray<unsigned char> d(buf);
    source(buf, len);
    readPadding(len, source);
    return string((char *) buf, len);
}

 
template<class T> T readStrings(Source & source)
{
    unsigned int count = readInt(source);
    T ss;
    while (count--)
        ss.insert(ss.end(), readString(source));
    return ss;
}

template Paths readStrings(Source & source);
template PathSet readStrings(Source & source);


void StringSink::operator () (const unsigned char * data, size_t len)
{
    static bool warned = false;
    if (!warned && s.size() > threshold) {
        warnLargeDump();
        warned = true;
    }
    s.append((const char *) data, len);
}


}