88 lines
1.7 KiB
C++
88 lines
1.7 KiB
C++
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#include "serialise.hh"
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#include "util.hh"
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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 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 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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string readString(Source & source)
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{
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unsigned int len = readInt(source);
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char buf[len];
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source((unsigned char *) buf, len);
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readPadding(len, source);
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return string(buf, len);
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}
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}
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