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#ifndef SRL_READER_MISC_H_ |
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#define SRL_READER_MISC_H_ |
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#include "srl_inline.h" |
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#include "srl_common.h" |
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#include "srl_reader.h" |
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#include "srl_protocol.h" |
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/* not sure that this's the best location for this function */ |
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SRL_STATIC_INLINE IV |
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875256
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srl_validate_header_version(pTHX_ srl_reader_char_ptr strdata, STRLEN len) |
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{ |
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875256
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100
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if ( len >= SRL_MAGIC_STRLEN + 3 ) { |
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/* + 3 above because: |
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* at least one version/flag byte, |
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* one byte for header len, |
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* one type byte (smallest payload) |
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*/ |
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/* Do NOT do *((U32*)strdata at least for these reasons: |
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* (1) Unaligned access can "Bus error" on you |
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* (char* can be much less aligned than U32). |
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* (2) In ILP64 even if aligned the U32 would be 64 bits wide, |
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* and the deref would read 8 bytes, more than the smallest |
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* (valid) message. |
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* (3) Endianness. |
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*/ |
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875207
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U8 version_encoding= strdata[SRL_MAGIC_STRLEN]; |
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875207
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U8 version= version_encoding & SRL_PROTOCOL_VERSION_MASK; |
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875207
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100
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if ( memEQ(SRL_MAGIC_STRING, strdata, SRL_MAGIC_STRLEN) ) { |
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252016
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100
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if ( 0 < version && version < 3 ) { |
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100
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252006
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return version_encoding; |
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} |
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} |
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else |
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623191
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100
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if ( memEQ(SRL_MAGIC_STRING_HIGHBIT, strdata, SRL_MAGIC_STRLEN) ) { |
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623169
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100
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if ( 3 <= version ) { |
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623153
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return version_encoding; |
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} |
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} |
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else |
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22
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100
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if ( memEQ(SRL_MAGIC_STRING_HIGHBIT_UTF8, strdata, SRL_MAGIC_STRLEN) ) { |
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7
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return 0; |
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} |
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} |
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90
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return -1; |
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} |
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#endif |