source: trunk/pin/include/buffers.ch@ 3

Last change on this file since 3 was 1, checked in by bart, 18 years ago

Initial checkin of PIN.EXE source code
this contains memory fixes for larger PPD files
File size: 2.7 KB
Line 
1// included into convert.c
2// input file caching (buffering)
3// this is very important for speed, allows for major gain
4
5// @V4.CACHE Begin
6
7/*****************************************************************************\
8**
9** FUNCTION = fbseek
10**
11** DESCRIPTION = Simulates fseek for file buffer
12**
13\*****************************************************************************/
14
15long fbseek(PFILEBUFFER pfb, long offset, INT origin)
16{
17 long lCurPos;
18
19 if( !pfb->pbBuffer || !pfb->fhFile )
20 return TRUE;
21
22 lCurPos = pfb->lCurPos;
23
24 switch(origin)
25 {
26 case SEEK_SET:
27 lCurPos = offset;
28 break;
29 case SEEK_CUR:
30 lCurPos += offset;
31 break;
32 case SEEK_END:
33 lCurPos = pfb->lFileLen + offset;
34 break;
35 default:
36 return TRUE;
37 }
38 if( lCurPos>=0 && lCurPos<=pfb->lFileLen )
39 {
40 pfb->lCurPos = lCurPos;
41 return FALSE;
42 }
43 else
44 return TRUE;
45}
46
47/*****************************************************************************\
48**
49** FUNCTION = fbtell
50**
51** DESCRIPTION = Simulates ftell for file buffer
52**
53\*****************************************************************************/
54
55long fbtell(PFILEBUFFER pfb)
56{
57 if( !pfb->pbBuffer || !pfb->fhFile )
58 return -1;
59
60 if( pfb->lCurPos>=0 && pfb->lCurPos < pfb->lFileLen )
61 return pfb->lCurPos;
62 else
63 return -1;
64}
65
66/*****************************************************************************\
67**
68** FUNCTION = fbread
69**
70** DESCRIPTION = Simulates fread for file buffer
71**
72\*****************************************************************************/
73
74long fbread(void *buff, long size, long count, PFILEBUFFER pfb)
75{
76 long lRealCount;
77
78 if( !pfb->pbBuffer || !pfb->fhFile )
79 return 0;
80 if( size<=0 || count<=0)
81 return 0;
82
83 if( pfb->lCurPos>=0 && pfb->lCurPos < pfb->lFileLen )
84 {
85 if( pfb->lCurPos+size*count>pfb->lFileLen )
86 lRealCount = (pfb->lFileLen - pfb->lCurPos)/size;
87 else
88 lRealCount = count;
89
90 memcpy(buff, pfb->pbBuffer+pfb->lCurPos, lRealCount*size );
91 pfb->lCurPos += lRealCount*size;
92
93 return lRealCount;
94 }
95 else
96 return 0;
97}
98
99/*****************************************************************************\
100**
101** FUNCTION = fbclose
102**
103** DESCRIPTION = Simulates fbclose for file buffer
104**
105\*****************************************************************************/
106
107long fbclose(PFILEBUFFER pfb)
108{
109 if( pfb->pbBuffer && pfb->fhFile )
110 {
111 fclose(pfb->fhFile);
112 free(pfb->pbBuffer);
113 memset( pfb, 0, sizeof( FILEBUFFER ) );
114
115 return 0;
116 }
117 else
118 return -1;
119}
120
121// @V4.CACHE End
122
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