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/** |
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* This file is part of the CernVM File System. |
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* |
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* Minimal XDR (RFC 4506) encoder/decoder for the built-in NFS server. |
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*/ |
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#ifndef CVMFS_NFS4_XDR_H_ |
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#define CVMFS_NFS4_XDR_H_ |
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#include <stdint.h> |
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#include <cstddef> |
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#include <string> |
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#include <vector> |
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namespace nfs4 { |
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/** |
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* Reads XDR items from a borrowed buffer. Errors are sticky: after the first |
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* short read every getter returns false and ok() stays false, so callers can |
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* decode a whole structure and check once. |
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*/ |
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class XdrReader { |
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public: |
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XdrReader(const unsigned char *data, size_t size) |
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: data_(data), size_(size), pos_(0), ok_(true) { } |
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bool GetU32(uint32_t *v); |
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bool GetI32(int32_t *v); |
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bool GetU64(uint64_t *v); |
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bool GetI64(int64_t *v); |
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bool GetBool(bool *v); |
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/** Variable-length opaque<max_len>; max_len 0 means unbounded. */ |
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bool GetOpaque(std::string *v, uint32_t max_len = 0); |
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bool GetFixedOpaque(unsigned char *v, size_t len); |
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bool GetString(std::string *v, uint32_t max_len = 0) { |
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return GetOpaque(v, max_len); |
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} |
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bool Skip(size_t len); |
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bool ok() const { return ok_; } |
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size_t pos() const { return pos_; } |
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size_t remaining() const { return size_ - pos_; } |
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const unsigned char *cursor() const { return data_ + pos_; } |
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private: |
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bool Take(size_t len); |
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const unsigned char *data_; |
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size_t size_; |
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size_t pos_; |
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bool ok_; |
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}; |
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class XdrWriter { |
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public: |
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XdrWriter() { } |
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void PutU32(uint32_t v); |
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void PutI32(int32_t v) { PutU32(static_cast<uint32_t>(v)); } |
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void PutU64(uint64_t v); |
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void PutI64(int64_t v) { PutU64(static_cast<uint64_t>(v)); } |
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void PutBool(bool v) { PutU32(v ? 1 : 0); } |
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void PutOpaque(const void *data, size_t len); |
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void PutOpaque(const std::string &v) { PutOpaque(v.data(), v.size()); } |
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void PutFixedOpaque(const void *data, size_t len); |
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void PutString(const std::string &v) { PutOpaque(v); } |
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/** Raw bytes, already XDR encoded. */ |
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void PutRaw(const void *data, size_t len); |
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/** Reserves a u32 slot that can be filled in later via PatchU32. */ |
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size_t ReserveU32(); |
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void PatchU32(size_t offset, uint32_t v); |
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size_t size() const { return buf_.size(); } |
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void Truncate(size_t size) { buf_.resize(size); } |
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const std::string &buffer() const { return buf_; } |
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std::string *mutable_buffer() { return &buf_; } |
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private: |
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std::string buf_; |
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}; |
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} // namespace nfs4 |
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#endif // CVMFS_NFS4_XDR_H_ |
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