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