146 lines
4.7 KiB
C
146 lines
4.7 KiB
C
/*
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Copyright (c) 2005-2009, The Musepack Development Team
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* Neither the name of the The Musepack Development Team nor the
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names of its contributors may be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/// \file mpc_reader.c
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/// Contains implementations for simple file-based mpc_reader
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#include <mpc/reader.h>
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#include "internal.h"
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#include <stdio.h>
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#include <string.h> // memset()
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#define STDIO_MAGIC 0xF34B963C ///< Just a random safe-check value...
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typedef struct mpc_reader_stdio_t {
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FILE *p_file;
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int file_size;
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mpc_bool_t is_seekable;
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mpc_int32_t magic;
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} mpc_reader_stdio;
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/// mpc_reader callback implementations
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static mpc_int32_t
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read_stdio(mpc_reader *p_reader, void *ptr, mpc_int32_t size)
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{
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mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
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if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FILE;
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return (mpc_int32_t) fread(ptr, 1, size, p_stdio->p_file);
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}
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static mpc_bool_t
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seek_stdio(mpc_reader *p_reader, mpc_int32_t offset)
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{
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mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
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if(p_stdio->magic != STDIO_MAGIC) return MPC_FALSE;
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return p_stdio->is_seekable ? fseek(p_stdio->p_file, offset, SEEK_SET) == 0 : MPC_FALSE;
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}
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static mpc_int32_t
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tell_stdio(mpc_reader *p_reader)
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{
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mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
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if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FILE;
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return ftell(p_stdio->p_file);
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}
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static mpc_int32_t
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get_size_stdio(mpc_reader *p_reader)
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{
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mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
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if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FILE;
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return p_stdio->file_size;
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}
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static mpc_bool_t
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canseek_stdio(mpc_reader *p_reader)
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{
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mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
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if(p_stdio->magic != STDIO_MAGIC) return MPC_FALSE;
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return p_stdio->is_seekable;
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}
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mpc_status
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mpc_reader_init_stdio_stream(mpc_reader * p_reader, FILE * p_file)
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{
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mpc_reader tmp_reader; mpc_reader_stdio *p_stdio; int err;
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p_stdio = NULL;
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memset(&tmp_reader, 0, sizeof tmp_reader);
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p_stdio = malloc(sizeof *p_stdio);
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if(!p_stdio) return MPC_STATUS_FILE;
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memset(p_stdio, 0, sizeof *p_stdio);
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p_stdio->magic = STDIO_MAGIC;
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p_stdio->p_file = p_file;
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p_stdio->is_seekable = MPC_TRUE;
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err = fseek(p_stdio->p_file, 0, SEEK_END);
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if(err < 0) goto clean;
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err = ftell(p_stdio->p_file);
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if(err < 0) goto clean;
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p_stdio->file_size = err;
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err = fseek(p_stdio->p_file, 0, SEEK_SET);
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if(err < 0) goto clean;
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tmp_reader.data = p_stdio;
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tmp_reader.canseek = canseek_stdio;
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tmp_reader.get_size = get_size_stdio;
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tmp_reader.read = read_stdio;
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tmp_reader.seek = seek_stdio;
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tmp_reader.tell = tell_stdio;
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*p_reader = tmp_reader;
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return MPC_STATUS_OK;
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clean:
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if(p_stdio && p_stdio->p_file)
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fclose(p_stdio->p_file);
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free(p_stdio);
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return MPC_STATUS_FILE;
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}
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mpc_status
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mpc_reader_init_stdio(mpc_reader *p_reader, const char *filename)
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{
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FILE * stream = fopen(filename, "rb");
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if (stream == NULL) return MPC_STATUS_FILE;
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return mpc_reader_init_stdio_stream(p_reader,stream);
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}
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void
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mpc_reader_exit_stdio(mpc_reader *p_reader)
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{
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mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data;
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if(p_stdio->magic != STDIO_MAGIC) return;
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fclose(p_stdio->p_file);
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free(p_stdio);
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p_reader->data = NULL;
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}
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