diff options
Diffstat (limited to 'drivers/opus/stream.c')
| -rw-r--r-- | drivers/opus/stream.c | 364 |
1 files changed, 0 insertions, 364 deletions
diff --git a/drivers/opus/stream.c b/drivers/opus/stream.c deleted file mode 100644 index 2ac12642dd..0000000000 --- a/drivers/opus/stream.c +++ /dev/null @@ -1,364 +0,0 @@ -/******************************************************************** - * * - * THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. * - * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * - * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * - * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * - * * - * THE libopusfile SOURCE CODE IS (C) COPYRIGHT 1994-2012 * - * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * - * * - ******************************************************************** - - function: stdio-based convenience library for opening/seeking/decoding - last mod: $Id: vorbisfile.c 17573 2010-10-27 14:53:59Z xiphmont $ - - ********************************************************************/ -#include "opus/opus_config.h" - -#include "opus/internal.h" -#include <sys/types.h> -#include <stdio.h> -#include <stdlib.h> -#include <errno.h> -#include <string.h> -#if defined(_WIN32) -# include <io.h> -#endif - -typedef struct OpusMemStream OpusMemStream; - -#define OP_MEM_SIZE_MAX (~(size_t)0>>1) -#define OP_MEM_DIFF_MAX ((ptrdiff_t)OP_MEM_SIZE_MAX) - -/*The context information needed to read from a block of memory as if it were a - file.*/ -struct OpusMemStream{ - /*The block of memory to read from.*/ - const unsigned char *data; - /*The total size of the block. - This must be at most OP_MEM_SIZE_MAX to prevent signed overflow while - seeking.*/ - ptrdiff_t size; - /*The current file position. - This is allowed to be set arbitrarily greater than size (i.e., past the end - of the block, though we will not read data past the end of the block), but - is not allowed to be negative (i.e., before the beginning of the block).*/ - ptrdiff_t pos; -}; - -static int op_fread(void *_stream,unsigned char *_ptr,int _buf_size){ - FILE *stream; - size_t ret; - /*Check for empty read.*/ - if(_buf_size<=0)return 0; - stream=(FILE *)_stream; - ret=fread(_ptr,1,_buf_size,stream); - OP_ASSERT(ret<=(size_t)_buf_size); - /*If ret==0 and !feof(stream), there was a read error.*/ - return ret>0||feof(stream)?(int)ret:OP_EREAD; -} - -static int op_fseek(void *_stream,opus_int64 _offset,int _whence){ -#if defined(_WIN32) - /*_fseeki64() is not exposed until MSCVCRT80. - This is the default starting with MSVC 2005 (_MSC_VER>=1400), but we want - to allow linking against older MSVCRT versions for compatibility back to - XP without installing extra runtime libraries. - i686-pc-mingw32 does not have fseeko() and requires - __MSVCRT_VERSION__>=0x800 for _fseeki64(), which screws up linking with - other libraries (that don't use MSVCRT80 from MSVC 2005 by default). - i686-w64-mingw32 does have fseeko() and respects _FILE_OFFSET_BITS, but I - don't know how to detect that at compile time. - We could just use fseeko64() (which is available in both), but its - implemented using fgetpos()/fsetpos() just like this code, except without - the overflow checking, so we prefer our version.*/ - opus_int64 pos; - /*We don't use fpos_t directly because it might be a struct if __STDC__ is - non-zero or _INTEGRAL_MAX_BITS < 64. - I'm not certain when the latter is true, but someone could in theory set - the former. - Either way, it should be binary compatible with a normal 64-bit int (this - assumption is not portable, but I believe it is true for MSVCRT).*/ - OP_ASSERT(sizeof(pos)==sizeof(fpos_t)); - /*Translate the seek to an absolute one.*/ - if(_whence==SEEK_CUR){ - int ret; - ret=fgetpos((FILE *)_stream,(fpos_t *)&pos); - if(ret)return ret; - } - else if(_whence==SEEK_END)pos=_filelengthi64(_fileno((FILE *)_stream)); - else if(_whence==SEEK_SET)pos=0; - else return -1; - /*Check for errors or overflow.*/ - if(pos<0||_offset<-pos||_offset>OP_INT64_MAX-pos)return -1; - pos+=_offset; - return fsetpos((FILE *)_stream,(fpos_t *)&pos); -#else - /*This function actually conforms to the SUSv2 and POSIX.1-2001, so we prefer - it except on Windows.*/ - return fseeko((FILE *)_stream,(off_t)_offset,_whence); -#endif -} - -static opus_int64 op_ftell(void *_stream){ -#if defined(_WIN32) - /*_ftelli64() is not exposed until MSCVCRT80, and ftello()/ftello64() have - the same problems as fseeko()/fseeko64() in MingW. - See above for a more detailed explanation.*/ - opus_int64 pos; - OP_ASSERT(sizeof(pos)==sizeof(fpos_t)); - return fgetpos((FILE *)_stream,(fpos_t *)&pos)?-1:pos; -#else - /*This function actually conforms to the SUSv2 and POSIX.1-2001, so we prefer - it except on Windows.*/ - return ftello((FILE *)_stream); -#endif -} - -static const OpusFileCallbacks OP_FILE_CALLBACKS={ - op_fread, - op_fseek, - op_ftell, - (op_close_func)fclose -}; - -#if defined(_WIN32) -# include <stddef.h> -# include <errno.h> - -/*Windows doesn't accept UTF-8 by default, and we don't have a wchar_t API, - so if we just pass the path to fopen(), then there'd be no way for a user - of our API to open a Unicode filename. - Instead, we translate from UTF-8 to UTF-16 and use Windows' wchar_t API. - This makes this API more consistent with platforms where the character set - used by fopen is the same as used on disk, which is generally UTF-8, and - with our metadata API, which always uses UTF-8.*/ -static wchar_t *op_utf8_to_utf16(const char *_src){ - wchar_t *dst; - size_t len; - len=strlen(_src); - /*Worst-case output is 1 wide character per 1 input character.*/ - dst=(wchar_t *)_ogg_malloc(sizeof(*dst)*(len+1)); - if(dst!=NULL){ - size_t si; - size_t di; - for(di=si=0;si<len;si++){ - int c0; - c0=(unsigned char)_src[si]; - if(!(c0&0x80)){ - /*Start byte says this is a 1-byte sequence.*/ - dst[di++]=(wchar_t)c0; - continue; - } - else{ - int c1; - /*This is safe, because c0 was not 0 and _src is NUL-terminated.*/ - c1=(unsigned char)_src[si+1]; - if((c1&0xC0)==0x80){ - /*Found at least one continuation byte.*/ - if((c0&0xE0)==0xC0){ - wchar_t w; - /*Start byte says this is a 2-byte sequence.*/ - w=(c0&0x1F)<<6|c1&0x3F; - if(w>=0x80U){ - /*This is a 2-byte sequence that is not overlong.*/ - dst[di++]=w; - si++; - continue; - } - } - else{ - int c2; - /*This is safe, because c1 was not 0 and _src is NUL-terminated.*/ - c2=(unsigned char)_src[si+2]; - if((c2&0xC0)==0x80){ - /*Found at least two continuation bytes.*/ - if((c0&0xF0)==0xE0){ - wchar_t w; - /*Start byte says this is a 3-byte sequence.*/ - w=(c0&0xF)<<12|(c1&0x3F)<<6|c2&0x3F; - if(w>=0x800U&&(w<0xD800||w>=0xE000)&&w<0xFFFE){ - /*This is a 3-byte sequence that is not overlong, not a - UTF-16 surrogate pair value, and not a 'not a character' - value.*/ - dst[di++]=w; - si+=2; - continue; - } - } - else{ - int c3; - /*This is safe, because c2 was not 0 and _src is - NUL-terminated.*/ - c3=(unsigned char)_src[si+3]; - if((c3&0xC0)==0x80){ - /*Found at least three continuation bytes.*/ - if((c0&0xF8)==0xF0){ - opus_uint32 w; - /*Start byte says this is a 4-byte sequence.*/ - w=(c0&7)<<18|(c1&0x3F)<<12|(c2&0x3F)<<6&(c3&0x3F); - if(w>=0x10000U&&w<0x110000U){ - /*This is a 4-byte sequence that is not overlong and not - greater than the largest valid Unicode code point. - Convert it to a surrogate pair.*/ - w-=0x10000; - dst[di++]=(wchar_t)(0xD800+(w>>10)); - dst[di++]=(wchar_t)(0xDC00+(w&0x3FF)); - si+=3; - continue; - } - } - } - } - } - } - } - } - /*If we got here, we encountered an illegal UTF-8 sequence.*/ - _ogg_free(dst); - return NULL; - } - OP_ASSERT(di<=len); - dst[di]='\0'; - } - return dst; -} - -#endif - -void *op_fopen(OpusFileCallbacks *_cb,const char *_path,const char *_mode){ - FILE *fp; -#if !defined(_WIN32) - fp=fopen(_path,_mode); -#else - fp=NULL; - if(_path==NULL||_mode==NULL)errno=EINVAL; - else{ - wchar_t *wpath; - wchar_t *wmode; - wpath=op_utf8_to_utf16(_path); - wmode=op_utf8_to_utf16(_mode); - if(wmode==NULL)errno=EINVAL; - else if(wpath==NULL)errno=ENOENT; - else fp=_wfopen(wpath,wmode); - _ogg_free(wmode); - _ogg_free(wpath); - } -#endif - if(fp!=NULL)*_cb=*&OP_FILE_CALLBACKS; - return fp; -} - -void *op_fdopen(OpusFileCallbacks *_cb,int _fd,const char *_mode){ - FILE *fp; - fp=fdopen(_fd,_mode); - if(fp!=NULL)*_cb=*&OP_FILE_CALLBACKS; - return fp; -} - -void *op_freopen(OpusFileCallbacks *_cb,const char *_path,const char *_mode, - void *_stream){ - FILE *fp; -#if !defined(_WIN32) - fp=freopen(_path,_mode,(FILE *)_stream); -#else - fp=NULL; - if(_path==NULL||_mode==NULL)errno=EINVAL; - else{ - wchar_t *wpath; - wchar_t *wmode; - wpath=op_utf8_to_utf16(_path); - wmode=op_utf8_to_utf16(_mode); - if(wmode==NULL)errno=EINVAL; - else if(wpath==NULL)errno=ENOENT; - else fp=_wfreopen(wpath,wmode,(FILE *)_stream); - _ogg_free(wmode); - _ogg_free(wpath); - } -#endif - if(fp!=NULL)*_cb=*&OP_FILE_CALLBACKS; - return fp; -} - -static int op_mem_read(void *_stream,unsigned char *_ptr,int _buf_size){ - OpusMemStream *stream; - ptrdiff_t size; - ptrdiff_t pos; - stream=(OpusMemStream *)_stream; - /*Check for empty read.*/ - if(_buf_size<=0)return 0; - size=stream->size; - pos=stream->pos; - /*Check for EOF.*/ - if(pos>=size)return 0; - /*Check for a short read.*/ - _buf_size=(int)OP_MIN(size-pos,_buf_size); - memcpy(_ptr,stream->data+pos,_buf_size); - pos+=_buf_size; - stream->pos=pos; - return _buf_size; -} - -static int op_mem_seek(void *_stream,opus_int64 _offset,int _whence){ - OpusMemStream *stream; - ptrdiff_t pos; - stream=(OpusMemStream *)_stream; - pos=stream->pos; - OP_ASSERT(pos>=0); - switch(_whence){ - case SEEK_SET:{ - /*Check for overflow:*/ - if(_offset<0||_offset>OP_MEM_DIFF_MAX)return -1; - pos=(ptrdiff_t)_offset; - }break; - case SEEK_CUR:{ - /*Check for overflow:*/ - if(_offset<-pos||_offset>OP_MEM_DIFF_MAX-pos)return -1; - pos=(ptrdiff_t)(pos+_offset); - }break; - case SEEK_END:{ - ptrdiff_t size; - size=stream->size; - OP_ASSERT(size>=0); - /*Check for overflow:*/ - if(_offset>size||_offset<size-OP_MEM_DIFF_MAX)return -1; - pos=(ptrdiff_t)(size-_offset); - }break; - default:return -1; - } - stream->pos=pos; - return 0; -} - -static opus_int64 op_mem_tell(void *_stream){ - OpusMemStream *stream; - stream=(OpusMemStream *)_stream; - return (ogg_int64_t)stream->pos; -} - -static int op_mem_close(void *_stream){ - _ogg_free(_stream); - return 0; -} - -static const OpusFileCallbacks OP_MEM_CALLBACKS={ - op_mem_read, - op_mem_seek, - op_mem_tell, - op_mem_close -}; - -void *op_mem_stream_create(OpusFileCallbacks *_cb, - const unsigned char *_data,size_t _size){ - OpusMemStream *stream; - if(_size>OP_MEM_SIZE_MAX)return NULL; - stream=(OpusMemStream *)_ogg_malloc(sizeof(*stream)); - if(stream!=NULL){ - *_cb=*&OP_MEM_CALLBACKS; - stream->data=_data; - stream->size=_size; - stream->pos=0; - } - return stream; -} |