[9] | 1 | #include "sysincludes.h"
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| 2 | #include "msdos.h"
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| 3 | #include "mtools.h"
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| 4 |
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| 5 | typedef struct Filter_t {
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| 6 | Class_t *Class;
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| 7 | int refs;
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| 8 | Stream_t *Next;
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| 9 | Stream_t *Buffer;
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| 10 |
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| 11 | int dospos;
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| 12 | int unixpos;
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| 13 | int mode;
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| 14 | int rw;
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| 15 | int lastchar;
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| 16 | } Filter_t;
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| 17 |
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| 18 | #define F_READ 1
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| 19 | #define F_WRITE 2
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| 20 |
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| 21 | /* read filter filters out messy dos' bizarre end of lines and final 0x1a's */
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| 22 |
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| 23 | static int read_filter(Stream_t *Stream, char *buf, mt_off_t iwhere, size_t len)
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| 24 | {
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| 25 | DeclareThis(Filter_t);
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| 26 | int i,j,ret;
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| 27 |
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| 28 | off_t where = truncBytes32(iwhere);
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| 29 |
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| 30 | if ( where != This->unixpos ){
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| 31 | fprintf(stderr,"Bad offset\n");
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| 32 | exit(1);
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| 33 | }
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| 34 | if (This->rw == F_WRITE){
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| 35 | fprintf(stderr,"Change of transfer direction!\n");
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| 36 | exit(1);
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| 37 | }
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| 38 | This->rw = F_READ;
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| 39 |
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| 40 | ret = READS(This->Next, buf, (mt_off_t) This->dospos, len);
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| 41 | if ( ret < 0 )
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| 42 | return ret;
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| 43 |
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| 44 | j = 0;
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| 45 | for (i=0; i< ret; i++){
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| 46 | if ( buf[i] == '\r' )
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| 47 | continue;
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| 48 | if (buf[i] == 0x1a)
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| 49 | break;
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| 50 | This->lastchar = buf[j++] = buf[i];
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| 51 | }
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| 52 |
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| 53 | This->dospos += i;
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| 54 | This->unixpos += j;
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| 55 | return j;
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| 56 | }
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| 57 |
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| 58 | static int write_filter(Stream_t *Stream, char *buf, mt_off_t iwhere,
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| 59 | size_t len)
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| 60 | {
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| 61 | DeclareThis(Filter_t);
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| 62 | int i,j,ret;
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| 63 | char buffer[1025];
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| 64 |
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| 65 | off_t where = truncBytes32(iwhere);
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| 66 |
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| 67 | if(This->unixpos == -1)
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| 68 | return -1;
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| 69 |
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| 70 | if (where != This->unixpos ){
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| 71 | fprintf(stderr,"Bad offset\n");
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| 72 | exit(1);
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| 73 | }
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| 74 |
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| 75 | if (This->rw == F_READ){
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| 76 | fprintf(stderr,"Change of transfer direction!\n");
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| 77 | exit(1);
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| 78 | }
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| 79 | This->rw = F_WRITE;
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| 80 |
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| 81 | j=i=0;
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| 82 | while(i < 1024 && j < len){
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| 83 | if (buf[j] == '\n' ){
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| 84 | buffer[i++] = '\r';
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| 85 | buffer[i++] = '\n';
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| 86 | j++;
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| 87 | continue;
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| 88 | }
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| 89 | buffer[i++] = buf[j++];
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| 90 | }
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| 91 | This->unixpos += j;
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| 92 |
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| 93 | ret = force_write(This->Next, buffer, (mt_off_t) This->dospos, i);
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| 94 | if(ret >0 )
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| 95 | This->dospos += ret;
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| 96 | if ( ret != i ){
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| 97 | /* no space on target file ? */
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| 98 | This->unixpos = -1;
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| 99 | return -1;
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| 100 | }
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| 101 | return j;
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| 102 | }
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| 103 |
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| 104 | static int free_filter(Stream_t *Stream)
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| 105 | {
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| 106 | DeclareThis(Filter_t);
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| 107 | char buffer=0x1a;
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| 108 |
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| 109 | /* write end of file */
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| 110 | if (This->rw == F_WRITE)
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| 111 | return force_write(This->Next, &buffer, (mt_off_t) This->dospos, 1);
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| 112 | else
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| 113 | return 0;
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| 114 | }
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| 115 |
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| 116 | static Class_t FilterClass = {
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| 117 | read_filter,
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| 118 | write_filter,
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| 119 | 0, /* flush */
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| 120 | free_filter,
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| 121 | 0, /* set geometry */
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| 122 | get_data_pass_through,
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| 123 | 0
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| 124 | };
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| 125 |
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| 126 | Stream_t *open_filter(Stream_t *Next)
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| 127 | {
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| 128 | Filter_t *This;
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| 129 |
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| 130 | This = New(Filter_t);
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| 131 | if (!This)
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| 132 | return NULL;
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| 133 | This->Class = &FilterClass;
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| 134 | This->dospos = This->unixpos = This->rw = 0;
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| 135 | This->Next = Next;
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| 136 | This->refs = 1;
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| 137 | This->Buffer = 0;
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| 138 |
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| 139 | return (Stream_t *) This;
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| 140 | }
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