diff options
Diffstat (limited to 'thirdparty/libmpcdec/mpc_reader.c')
| -rw-r--r-- | thirdparty/libmpcdec/mpc_reader.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/thirdparty/libmpcdec/mpc_reader.c b/thirdparty/libmpcdec/mpc_reader.c new file mode 100644 index 0000000000..550c5ecb54 --- /dev/null +++ b/thirdparty/libmpcdec/mpc_reader.c @@ -0,0 +1,145 @@ +/* + Copyright (c) 2005-2009, The Musepack Development Team + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following + disclaimer in the documentation and/or other materials provided + with the distribution. + + * Neither the name of the The Musepack Development Team nor the + names of its contributors may be used to endorse or promote + products derived from this software without specific prior + written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ +/// \file mpc_reader.c +/// Contains implementations for simple file-based mpc_reader +#include <mpc/reader.h> +#include "internal.h" +#include <stdio.h> +#include <string.h> // memset() + +#define STDIO_MAGIC 0xF34B963C ///< Just a random safe-check value... +typedef struct mpc_reader_stdio_t { + FILE *p_file; + int file_size; + mpc_bool_t is_seekable; + mpc_int32_t magic; +} mpc_reader_stdio; + +/// mpc_reader callback implementations +static mpc_int32_t +read_stdio(mpc_reader *p_reader, void *ptr, mpc_int32_t size) +{ + mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data; + if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FILE; + return (mpc_int32_t) fread(ptr, 1, size, p_stdio->p_file); +} + +static mpc_bool_t +seek_stdio(mpc_reader *p_reader, mpc_int32_t offset) +{ + mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data; + if(p_stdio->magic != STDIO_MAGIC) return MPC_FALSE; + return p_stdio->is_seekable ? fseek(p_stdio->p_file, offset, SEEK_SET) == 0 : MPC_FALSE; +} + +static mpc_int32_t +tell_stdio(mpc_reader *p_reader) +{ + mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data; + if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FILE; + return ftell(p_stdio->p_file); +} + +static mpc_int32_t +get_size_stdio(mpc_reader *p_reader) +{ + mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data; + if(p_stdio->magic != STDIO_MAGIC) return MPC_STATUS_FILE; + return p_stdio->file_size; +} + +static mpc_bool_t +canseek_stdio(mpc_reader *p_reader) +{ + mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data; + if(p_stdio->magic != STDIO_MAGIC) return MPC_FALSE; + return p_stdio->is_seekable; +} + +mpc_status +mpc_reader_init_stdio_stream(mpc_reader * p_reader, FILE * p_file) +{ + mpc_reader tmp_reader; mpc_reader_stdio *p_stdio; int err; + + p_stdio = NULL; + memset(&tmp_reader, 0, sizeof tmp_reader); + p_stdio = malloc(sizeof *p_stdio); + if(!p_stdio) return MPC_STATUS_FILE; + memset(p_stdio, 0, sizeof *p_stdio); + + p_stdio->magic = STDIO_MAGIC; + p_stdio->p_file = p_file; + p_stdio->is_seekable = MPC_TRUE; + err = fseek(p_stdio->p_file, 0, SEEK_END); + if(err < 0) goto clean; + err = ftell(p_stdio->p_file); + if(err < 0) goto clean; + p_stdio->file_size = err; + err = fseek(p_stdio->p_file, 0, SEEK_SET); + if(err < 0) goto clean; + + tmp_reader.data = p_stdio; + tmp_reader.canseek = canseek_stdio; + tmp_reader.get_size = get_size_stdio; + tmp_reader.read = read_stdio; + tmp_reader.seek = seek_stdio; + tmp_reader.tell = tell_stdio; + + *p_reader = tmp_reader; + return MPC_STATUS_OK; +clean: + if(p_stdio && p_stdio->p_file) + fclose(p_stdio->p_file); + free(p_stdio); + return MPC_STATUS_FILE; +} + +mpc_status +mpc_reader_init_stdio(mpc_reader *p_reader, const char *filename) +{ + FILE * stream = fopen(filename, "rb"); + if (stream == NULL) return MPC_STATUS_FILE; + return mpc_reader_init_stdio_stream(p_reader,stream); +} + +void +mpc_reader_exit_stdio(mpc_reader *p_reader) +{ + mpc_reader_stdio *p_stdio = (mpc_reader_stdio*) p_reader->data; + if(p_stdio->magic != STDIO_MAGIC) return; + fclose(p_stdio->p_file); + free(p_stdio); + p_reader->data = NULL; +} + |