1 /*
2 Copyright (c) 2005-2009, The Musepack Development Team
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are
7 met:
8
9 * Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
11
12 * Redistributions in binary form must reproduce the above
13 copyright notice, this list of conditions and the following
14 disclaimer in the documentation and/or other materials provided
15 with the distribution.
16
17 * Neither the name of the The Musepack Development Team nor the
18 names of its contributors may be used to endorse or promote
19 products derived from this software without specific prior
20 written permission.
21
22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
28 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34 /// \file mpc_reader.c
35 /// Contains implementations for simple file-based mpc_reader
36 #include "reader.h"
37 #include "internal.h"
38 #include <stdio.h>
39
40 #define STDIO_MAGIC 0xF34B963C ///< Just a random safe-check value...
41 typedef struct mpc_reader_stdio_t {
42 FILE *p_file;
43 int file_size;
44 mpc_bool_t is_seekable;
45 mpc_int32_t magic;
46 } mpc_reader_stdio;
47
48 /// mpc_reader callback implementations
49 static mpc_int32_t
read_stdio(mpc_reader * p_reader,void * ptr,mpc_int32_t size)50 read_stdio(mpc_reader *p_reader, void *ptr, mpc_int32_t size)
51 {
52 mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
53 if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FAIL;
54 return (mpc_int32_t) fread(ptr, 1, size, p_stdio->p_file);
55 }
56
57 static mpc_bool_t
seek_stdio(mpc_reader * p_reader,mpc_int32_t offset)58 seek_stdio(mpc_reader *p_reader, mpc_int32_t offset)
59 {
60 mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
61 if(p_stdio->magic != STDIO_MAGIC) return MPC_FALSE;
62 return p_stdio->is_seekable ? fseek(p_stdio->p_file, offset, SEEK_SET) == 0 : MPC_FALSE;
63 }
64
65 static mpc_int32_t
tell_stdio(mpc_reader * p_reader)66 tell_stdio(mpc_reader *p_reader)
67 {
68 mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
69 if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FAIL;
70 return ftell(p_stdio->p_file);
71 }
72
73 static mpc_int32_t
get_size_stdio(mpc_reader * p_reader)74 get_size_stdio(mpc_reader *p_reader)
75 {
76 mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
77 if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FAIL;
78 return p_stdio->file_size;
79 }
80
81 static mpc_bool_t
canseek_stdio(mpc_reader * p_reader)82 canseek_stdio(mpc_reader *p_reader)
83 {
84 mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
85 if(p_stdio->magic != STDIO_MAGIC) return MPC_FALSE;
86 return p_stdio->is_seekable;
87 }
88
89 mpc_status
mpc_reader_init_stdio_stream(mpc_reader * p_reader,FILE * p_file)90 mpc_reader_init_stdio_stream(mpc_reader * p_reader, FILE * p_file)
91 {
92 mpc_reader tmp_reader; mpc_reader_stdio *p_stdio; int err;
93
94 p_stdio = NULL;
95 memset(&tmp_reader, 0, sizeof tmp_reader);
96 p_stdio = malloc(sizeof *p_stdio);
97 if(!p_stdio) return MPC_STATUS_FAIL;
98 memset(p_stdio, 0, sizeof *p_stdio);
99
100 p_stdio->magic = STDIO_MAGIC;
101 p_stdio->p_file = p_file;
102 p_stdio->is_seekable = MPC_TRUE;
103 err = fseek(p_stdio->p_file, 0, SEEK_END);
104 if(err < 0) goto clean;
105 err = ftell(p_stdio->p_file);
106 if(err < 0) goto clean;
107 p_stdio->file_size = err;
108 err = fseek(p_stdio->p_file, 0, SEEK_SET);
109 if(err < 0) goto clean;
110
111 tmp_reader.data = p_stdio;
112 tmp_reader.canseek = canseek_stdio;
113 tmp_reader.get_size = get_size_stdio;
114 tmp_reader.read = read_stdio;
115 tmp_reader.seek = seek_stdio;
116 tmp_reader.tell = tell_stdio;
117
118 *p_reader = tmp_reader;
119 return MPC_STATUS_OK;
120 clean:
121 if(p_stdio && p_stdio->p_file)
122 fclose(p_stdio->p_file);
123 free(p_stdio);
124 return MPC_STATUS_FAIL;
125 }
126
127 mpc_status
mpc_reader_init_stdio(mpc_reader * p_reader,const char * filename)128 mpc_reader_init_stdio(mpc_reader *p_reader, const char *filename)
129 {
130 FILE * stream = fopen(filename, "rb");
131 if (stream == NULL) return MPC_STATUS_FAIL;
132 return mpc_reader_init_stdio_stream(p_reader,stream);
133 }
134
135 void
mpc_reader_exit_stdio(mpc_reader * p_reader)136 mpc_reader_exit_stdio(mpc_reader *p_reader)
137 {
138 mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
139 if(p_stdio->magic != STDIO_MAGIC) return;
140 fclose(p_stdio->p_file);
141 free(p_stdio);
142 p_reader->data = NULL;
143 }
144
145