forked from lix-project/lix
140 lines
2.9 KiB
C++
140 lines
2.9 KiB
C++
#include "serialise.hh"
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#include "util.hh"
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#include <cstring>
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namespace nix {
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void FdSink::operator () (const unsigned char * data, unsigned int len)
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{
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writeFull(fd, data, len);
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}
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void FdSource::operator () (unsigned char * data, unsigned int len)
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{
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readFull(fd, data, len);
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}
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void writePadding(unsigned int len, Sink & sink)
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{
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if (len % 8) {
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unsigned char zero[8];
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memset(zero, 0, sizeof(zero));
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sink(zero, 8 - (len % 8));
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}
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}
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void writeInt(unsigned int n, Sink & sink)
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{
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unsigned char buf[8];
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memset(buf, 0, sizeof(buf));
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buf[0] = n & 0xff;
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buf[1] = (n >> 8) & 0xff;
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buf[2] = (n >> 16) & 0xff;
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buf[3] = (n >> 24) & 0xff;
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sink(buf, sizeof(buf));
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}
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void writeLongLong(unsigned long long n, Sink & sink)
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{
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unsigned char buf[8];
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buf[0] = n & 0xff;
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buf[1] = (n >> 8) & 0xff;
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buf[2] = (n >> 16) & 0xff;
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buf[3] = (n >> 24) & 0xff;
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buf[4] = (n >> 32) & 0xff;
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buf[5] = (n >> 40) & 0xff;
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buf[6] = (n >> 48) & 0xff;
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buf[7] = (n >> 56) & 0xff;
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sink(buf, sizeof(buf));
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}
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void writeString(const string & s, Sink & sink)
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{
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unsigned int len = s.length();
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writeInt(len, sink);
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sink((const unsigned char *) s.c_str(), len);
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writePadding(len, sink);
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}
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void writeStringSet(const StringSet & ss, Sink & sink)
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{
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writeInt(ss.size(), sink);
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for (StringSet::iterator i = ss.begin(); i != ss.end(); ++i)
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writeString(*i, sink);
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}
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void readPadding(unsigned int len, Source & source)
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{
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if (len % 8) {
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unsigned char zero[8];
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unsigned int n = 8 - (len % 8);
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source(zero, n);
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for (unsigned int i = 0; i < n; i++)
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if (zero[i]) throw Error("non-zero padding");
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}
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}
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unsigned int readInt(Source & source)
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{
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unsigned char buf[8];
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source(buf, sizeof(buf));
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if (buf[4] || buf[5] || buf[6] || buf[7])
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throw Error("implementation cannot deal with > 32-bit integers");
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return
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buf[0] |
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(buf[1] << 8) |
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(buf[2] << 16) |
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(buf[3] << 24);
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}
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unsigned long long readLongLong(Source & source)
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{
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unsigned char buf[8];
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source(buf, sizeof(buf));
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return
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((unsigned long long) buf[0]) |
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((unsigned long long) buf[1] << 8) |
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((unsigned long long) buf[2] << 16) |
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((unsigned long long) buf[3] << 24) |
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((unsigned long long) buf[4] << 32) |
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((unsigned long long) buf[5] << 40) |
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((unsigned long long) buf[6] << 48) |
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((unsigned long long) buf[7] << 56);
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}
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string readString(Source & source)
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{
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unsigned int len = readInt(source);
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unsigned char * buf = new unsigned char[len];
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AutoDeleteArray<unsigned char> d(buf);
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source(buf, len);
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readPadding(len, source);
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return string((char *) buf, len);
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}
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StringSet readStringSet(Source & source)
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{
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unsigned int count = readInt(source);
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StringSet ss;
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while (count--)
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ss.insert(readString(source));
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return ss;
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}
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}
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