Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 1 | /* Copyright 1996,1997,1999,2001-2003,2008,2009,2021 Alain Knaff. |
| 2 | * This file is part of mtools. |
| 3 | * |
| 4 | * Mtools is free software: you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation, either version 3 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * Mtools is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with Mtools. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include "sysincludes.h" |
| 19 | #include "msdos.h" |
| 20 | #include "mtools.h" |
| 21 | #include "codepage.h" |
| 22 | |
| 23 | #define U2D_BUFSIZE 4096 |
| 24 | |
| 25 | typedef struct Filter_t { |
| 26 | struct Stream_t head; |
| 27 | |
| 28 | char buffer[U2D_BUFSIZE]; |
| 29 | |
| 30 | size_t readBytes; /* how many bytes read into buffer */ |
| 31 | size_t bufPos; /* position in buffer */ |
| 32 | |
| 33 | bool pendingNl; |
| 34 | bool eof; |
| 35 | } Filter_t; |
| 36 | |
| 37 | /* Add CR before NL, and 0x1a at end of file */ |
| 38 | static ssize_t read_filter(Stream_t *Stream, char *output, size_t len) |
| 39 | { |
| 40 | DeclareThis(Filter_t); |
| 41 | size_t i; |
| 42 | |
| 43 | if(This->eof) |
| 44 | return 0; |
| 45 | |
| 46 | for(i=0; i < len && !This->eof; i++) { |
| 47 | char c; |
| 48 | if(This->pendingNl) { |
| 49 | c='\n'; |
| 50 | This->pendingNl=false; |
| 51 | } else { |
| 52 | if(This->bufPos == This->readBytes) { |
| 53 | ssize_t ret = READS(This->head.Next, |
| 54 | This->buffer, |
| 55 | U2D_BUFSIZE); |
| 56 | if(ret < 0) { |
| 57 | /* an error */ |
| 58 | /* If we already have read some data, |
| 59 | * first return count of that data |
| 60 | * before returning error */ |
| 61 | if(i == 0) |
| 62 | return -1; |
| 63 | else |
| 64 | break; |
| 65 | } |
| 66 | This->readBytes = (size_t) ret; |
| 67 | This->bufPos = 0; |
| 68 | } |
| 69 | |
| 70 | if(This->bufPos == This->readBytes) { |
| 71 | /* Still at end of buffer, must be end |
| 72 | of file */ |
| 73 | c='\032'; |
| 74 | This->eof=true; |
| 75 | } else { |
| 76 | c = This->buffer[This->bufPos++]; |
| 77 | if(c == '\n') { |
| 78 | This->pendingNl=true; |
| 79 | c = '\r'; |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | output[i]=c; |
| 84 | } |
| 85 | |
| 86 | return (ssize_t) i; |
| 87 | } |
| 88 | |
| 89 | static Class_t FilterClass = { |
| 90 | read_filter, |
| 91 | 0, |
| 92 | 0, |
| 93 | 0, |
| 94 | 0, /* flush */ |
| 95 | 0, |
| 96 | 0, /* set geometry */ |
| 97 | get_data_pass_through, |
| 98 | 0, |
| 99 | 0, /* get_dosconvert */ |
| 100 | 0 /* discard */ |
| 101 | }; |
| 102 | |
| 103 | Stream_t *open_unix2dos(Stream_t *Next, int convertCharset UNUSEDP) |
| 104 | { |
| 105 | Filter_t *This; |
| 106 | |
| 107 | This = New(Filter_t); |
| 108 | if (!This) |
| 109 | return NULL; |
| 110 | init_head(&This->head, &FilterClass, Next); |
| 111 | |
| 112 | This->readBytes = This->bufPos = 0; |
| 113 | This->pendingNl = false; |
| 114 | This->eof = false; |
| 115 | |
| 116 | return &This->head; |
| 117 | } |