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blockFileInternal.h (2554B)
1 #pragma once
2
3 static blockFileFunctionst *blockFileF = NULL;
4
5 /* TODO declare structs for private data and add a void pointer to the private data in the class declaration */
6
7 // file format
8 // block 0 reserved > first 8 bytes: blockSize, next byte: block index size 32bits (0) or 64bits (1)
9 // block 1 data
10 // block 2 data
11 // ...
12
13 typedef struct {
14 u64 blockSize;
15 uint8_t blockIndexSize:1; // 0 32bits - 1 64bits TODO 32 only for now
16 } block0;
17
18 // block format
19 // byte 0:
20 // bit 0: 0 block in a chain - 1 first block in chain
21 // bit 1: 0 not compressed - 1 compressed with lz4
22 // dataSize u64 - size of the document, only first block
23 // nextBlock u32 or u64 - 0 means no next block
24 // (blCount u64 - how many block for this document)
25 // decompressedSize u32 - only when document is compressed, only first block
26 // data
27 //
28 // First block
29 // 1 or 3
30 // dataSize
31 // nextBlock
32 // decompressedSize
33 // data
34 //
35 // Other blocks
36 // 0
37 // nextBlock
38 // data
39
40 #define PACKED __attribute__((__packed__))
41
42 typedef struct PACKED {
43 u8 chain:1; // 0 block in a chain - 1 first block in chain
44 u8 z:1; // 0 not compressed - 1 compressed with lz4
45 u64 nextBlock;
46 // end of header in chain block
47 u64 dataSize;
48 // end of header in not compressed document
49 uint32_t decompressedSize;
50 } blockt;
51
52 struct PACKED firstBlockHeader {
53 u8 chain:1; // 0 block in a chain - 1 first block in chain
54 u8 z:1; // 0 not compressed - 1 compressed with lz4
55 u64 nextBlock;
56 u64 dataSize;
57 };
58
59 struct PACKED firstBlockHeaderCompressed {
60 u8 chain:1; // 0 block in a chain - 1 first block in chain
61 u8 z:1; // 0 not compressed - 1 compressed with lz4
62 u64 nextBlock;
63 u64 dataSize;
64 uint32_t decompressedSize;
65 };
66
67 struct PACKED blockheader {
68 u8 chain:1; // 0 block in a chain - 1 first block in chain
69 u8 z:1; // 0 not compressed - 1 compressed with lz4
70 u64 nextBlock;
71 };
72
73
74
75 // API
76 // open open file
77 // load load all documents in file
78 // add add data, return first block
79 // get get data by block
80 // remove remove data
81 // delete delete file
82 // close close file
83
84 #define uI u32
85
86 dArrayT(freeBlocks, uI);
87
88 typedef enum {READWRITE, APPEND} fmodet;
89
90 struct privateBlockFile {
91 u64 count; // block count
92 u64 blockSize;
93 freeBlocks freeBlocks;
94 const char *name;
95 char *freeName;
96 FILE *f;
97 fmodet fmode;
98 FILE *freeF;
99 flagsBlockFilet defaultFlags;
100 };
101
102 // save freeBlocks in a file
103
104 #define fil (*(self->file))
105 #define BLOCKSIZE 64
106