1/**********
2This library is free software; you can redistribute it and/or modify it under
3the terms of the GNU Lesser General Public License as published by the
4Free Software Foundation; either version 3 of the License, or (at your
5option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
6
7This library is distributed in the hope that it will be useful, but WITHOUT
8ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
9FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
10more details.
11
12You should have received a copy of the GNU Lesser General Public License
13along with this library; if not, write to the Free Software Foundation, Inc.,
1451 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15**********/
16// "liveMedia"
17// Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved.
18// Common routines for opening/closing named input files
19// Implementation
20
21#include "InputFile.hh"
22#include <string.h>
23
24FILE* OpenInputFile(UsageEnvironment& env, char const* fileName) {
25 FILE* fid;
26
27 // Check for a special case file name: "stdin"
28 if (strcmp(fileName, "stdin") == 0) {
29 fid = stdin;
30#if (defined(__WIN32__) || defined(_WIN32)) && !defined(_WIN32_WCE)
31 _setmode(_fileno(stdin), _O_BINARY); // convert to binary mode
32#endif
33 } else {
34 fid = fopen(fileName, "rb");
35 if (fid == NULL) {
36 env.setResultMsg("unable to open file \"",fileName, "\"");
37 }
38 }
39
40 return fid;
41}
42
43void CloseInputFile(FILE* fid) {
44 // Don't close 'stdin', in case we want to use it again later.
45 if (fid != NULL && fid != stdin) fclose(fid);
46}
47
48u_int64_t GetFileSize(char const* fileName, FILE* fid) {
49 u_int64_t fileSize = 0; // by default
50
51 if (fid != stdin) {
52#if !defined(_WIN32_WCE)
53 if (fileName == NULL) {
54#endif
55 if (fid != NULL && SeekFile64(fid, 0, SEEK_END) >= 0) {
56 fileSize = (u_int64_t)TellFile64(fid);
57 if (fileSize == (u_int64_t)-1) fileSize = 0; // TellFile64() failed
58 SeekFile64(fid, 0, SEEK_SET);
59 }
60#if !defined(_WIN32_WCE)
61 } else {
62 struct stat sb;
63 if (stat(fileName, &sb) == 0) {
64 fileSize = sb.st_size;
65 }
66 }
67#endif
68 }
69
70 return fileSize;
71}
72
73int64_t SeekFile64(FILE *fid, int64_t offset, int whence) {
74 if (fid == NULL) return -1;
75
76 clearerr(fid);
77 fflush(fid);
78#if (defined(__WIN32__) || defined(_WIN32)) && !defined(_WIN32_WCE)
79 return _lseeki64(_fileno(fid), offset, whence) == (int64_t)-1 ? -1 : 0;
80#else
81#if defined(_WIN32_WCE)
82 return fseek(fid, (long)(offset), whence);
83#else
84 return fseeko(fid, (off_t)(offset), whence);
85#endif
86#endif
87}
88
89int64_t TellFile64(FILE *fid) {
90 if (fid == NULL) return -1;
91
92 clearerr(fid);
93 fflush(fid);
94#if (defined(__WIN32__) || defined(_WIN32)) && !defined(_WIN32_WCE)
95 return _telli64(_fileno(fid));
96#else
97#if defined(_WIN32_WCE)
98 return ftell(fid);
99#else
100 return ftello(fid);
101#endif
102#endif
103}
104
105Boolean FileIsSeekable(FILE *fid) {
106 if (SeekFile64(fid, 1, SEEK_CUR) < 0) {
107 return False;
108 }
109
110 SeekFile64(fid, -1, SEEK_CUR); // seek back to where we were
111 return True;
112}
113