115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
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/*
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* saveload.h
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* Luabins internal constants and helper macros
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* See copyright notice in luabins.h
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*/
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#ifndef LUABINS_SAVELOAD_H_INCLUDED_
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#define LUABINS_SAVELOAD_H_INCLUDED_
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/* Find minimum of two values */
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#define luabins_min(a, b) \
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( ((a) < (b)) ? (a) : (b) )
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/* Find maximum of two values */
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#define luabins_max(a, b) \
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( ((a) > (b)) ? (a) : (b) )
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/* Find minimum of three values */
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#define luabins_min3(a, b, c) \
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( ((a) < (b)) ? luabins_min((a), (c)) : luabins_min((b), (c)) )
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/* Preprocessor concatenation */
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#define LUABINS_CAT(a, b) a##b
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/* Static assert helper macro */
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#define luabins_static_assert_line(pred, line) \
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typedef char LUABINS_CAT( \
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static_assertion_failed_at_line_, \
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line \
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)[2 * !!(pred) - 1]
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/* Static (compile-time) assert */
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#define luabins_static_assert(pred) \
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luabins_static_assert_line(pred, __LINE__)
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/* Internal error codes */
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#define LUABINS_ESUCCESS (0)
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#define LUABINS_EFAILURE (1)
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#define LUABINS_EBADTYPE (2)
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#define LUABINS_ETOODEEP (3)
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#define LUABINS_ENOSTACK (4)
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#define LUABINS_EBADDATA (5)
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#define LUABINS_ETAILEFT (6)
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#define LUABINS_EBADSIZE (7)
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#define LUABINS_ETOOLONG (8)
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/* Type bytes */
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#define LUABINS_CNIL '-' /* 0x2D (45) */
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#define LUABINS_CFALSE '0' /* 0x30 (48) */
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#define LUABINS_CTRUE '1' /* 0x31 (49) */
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#define LUABINS_CNUMBER 'N' /* 0x4E (78) */
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#define LUABINS_CSTRING 'S' /* 0x53 (83) */
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#define LUABINS_CTABLE 'T' /* 0x54 (84) */
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/*
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* PORTABILITY WARNING!
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* You have to ensure manually that length constants below are the same
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* for both code that does the save and code that does the load.
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* Also these constants must be actual or code below would break.
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* Beware of endianness and lua_Number actual type as well.
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* Note also that luabins does not check for overflow on save,
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* if your integer does not fit, it would be truncated.
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*/
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#define LUABINS_LINT (4)
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#define LUABINS_LSIZET (4)
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#define LUABINS_LNUMBER (8)
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/*
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* Derived lengths
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*
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* WARNING: Change these if format is changed!
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*/
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/* One type byte */
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#define LUABINS_LTYPEBYTE (1)
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/* Minimal table: type, array size, hash size, no data */
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#define LUABINS_LMINTABLE (LUABINS_LTYPEBYTE + LUABINS_LINT + LUABINS_LINT)
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/* Minimal number: type, number value */
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#define LUABINS_LMINNUMBER (LUABINS_LTYPEBYTE + LUABINS_LNUMBER)
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/* Minimal string: type, length, no data */
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#define LUABINS_LMINSTRING (LUABINS_LTYPEBYTE + LUABINS_LSIZET)
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/* Minimum large (non-boolean non-nil) value length */
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#define LUABINS_LMINLARGEVALUE \
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( luabins_min3(LUABINS_LMINTABLE, LUABINS_LMINSTRING, LUABINS_LMINSTRING) )
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/*
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* Lower limit on total table data size is determined as follows:
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* -- All entries are always key and value.
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* -- Minimum value size is one byte for nil and boolean,
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* but that is two keys maximum (nil can'be the key).
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* -- All the rest of key types are mimimum of LUABINS_MINLARGEVALUELEN
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* bytes (type byte plus data bytes).
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* -- All values in the table may be booleans.
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*
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* WARNING: Change this if format is changed!
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*
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* Note this formula does NOT take in account
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* table header (type byte and array/hash sizes).
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*/
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#define luabins_min_table_data_size(total_size) \
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( \
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(total_size > 2) \
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? ( \
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2 * (LUABINS_LTYPEBYTE + LUABINS_LTYPEBYTE) \
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+ (total_size - 2) * (LUABINS_LMINLARGEVALUE + LUABINS_LTYPEBYTE) \
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) \
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: (total_size * (LUABINS_LTYPEBYTE + LUABINS_LTYPEBYTE)) \
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)
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#endif /* LUABINS_SAVELOAD_H_INCLUDED_ */
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