92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
#ifndef _ROSE_COMPRESSION_COMPRESSION_H__
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#define _ROSE_COMPRESSION_COMPRESSION_H__
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#include <limits.h>
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#define __STDC_LIMIT_MACROS 1
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#include <stdint.h>
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#ifndef UINT16_MAX // XXX should be defined in stdint.h.
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#define UINT16_MAX (65535)
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#endif
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namespace rose {
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#define COMPRESSION_BINARY_FIND
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typedef int8_t record_size_t;
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typedef uint16_t byte_off_t;
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typedef uint16_t slot_index_t;
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typedef uint8_t plugin_id_t;
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typedef uint8_t column_number_t;
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typedef uint16_t column_offset_t;
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typedef uint64_t epoch_t;
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static const record_size_t VARIABLE_SIZE = CHAR_MAX;
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static const slot_index_t NOSPACE = UINT16_MAX;
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static const slot_index_t EXCEPTIONAL = UINT16_MAX-1;
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static const slot_index_t MAX_INDEX = UINT16_MAX-2;
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static const slot_index_t INVALID_COL = UCHAR_MAX;
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/**
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This function computes a page type (an integer stored in the page header)
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so that Stasis can dispatch calls to the appropriate page implemenation.
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Most page types choose a single constant, but pstar's page layout varies
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across different template instantiations. In particular, the page layout
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depends on sizeof(TYPE), and upon COMPRESOR. Finally, pstar and the
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compressors behave differently depending on whether or not TYPE is signed
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or unsigned. (Non integer types are currently not supported.)
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Right now, everything happens to be a power of two and the page
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type is of this form:
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BASE_PAGEID + 00PCSII(base2)
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P stores the page format PAGE_FORMAT_ID
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C stores the compressor PLUGIN_ID.
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S is 1 iff the type is signed
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II is 00, 01, 10, 11 depending on the sizeof(type)
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Although the on disk representation is bigger; stasis tries to keep page
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types within the range 0 - 255.
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*/
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template <class PAGEFORMAT, class COMPRESSOR, class TYPE>
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inline plugin_id_t plugin_id() {
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/* type_idx maps from sizeof(TYPE) to a portion of a page type:
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(u)int8_t -> 0
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(u)int16_t -> 1
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(u)int32_t -> 2
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(u)int64_t -> 3
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*/
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// Number of bytes in type ---> 1 2 4 8
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static const int type_idx[] = { -1, 0, 1, -1, 2, -1, -1, -1, 3 };
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static const int idx_count = 4;
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static const TYPE is_signed = 0 - 1;
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// assert(sizeof(TYPE) <= 8 && type_idx[sizeof(TYPE)] >= 0);
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// XXX '3' hardcodes the number of COMPRESSOR implementations...
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plugin_id_t ret = USER_DEFINED_PAGE(0)
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// II S C
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+ idx_count * 2 * 3 * PAGEFORMAT::PAGE_FORMAT_ID
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+ idx_count * 2 * COMPRESSOR::PLUGIN_ID
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+ idx_count * (is_signed < 0)
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+ type_idx[sizeof(TYPE)];
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return ret;
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}
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double tv_to_double(struct timeval tv) {
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return static_cast<double>(tv.tv_sec) +
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(static_cast<double>(tv.tv_usec) / 1000000.0);
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}
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}
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#endif // _ROSE_COMPRESSION_COMPRESSION_H__
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