ref: c7635b45f48b730985b00615806d4b37d47afc67
dir: /libcelt/entenc.c/
#ifdef HAVE_CONFIG_H #include "config.h" #endif #include "os_support.h" #include "entenc.h" #include "arch.h" #define EC_BUFFER_INCREMENT (256) void ec_byte_writeinit_buffer(ec_byte_buffer *_b, unsigned char *_buf, long _size){ _b->ptr=_b->buf=_buf; _b->storage=_size; _b->resizable = 0; } void ec_byte_writeinit(ec_byte_buffer *_b){ _b->ptr=_b->buf=celt_alloc(EC_BUFFER_INCREMENT*sizeof(char)); _b->storage=EC_BUFFER_INCREMENT; _b->resizable = 1; } void ec_byte_writetrunc(ec_byte_buffer *_b,long _bytes){ _b->ptr=_b->buf+_bytes; } void ec_byte_write1(ec_byte_buffer *_b,unsigned _value){ ptrdiff_t endbyte; endbyte=_b->ptr-_b->buf; if(endbyte>=_b->storage){ if (_b->resizable){ _b->buf=celt_realloc(_b->buf,(_b->storage+EC_BUFFER_INCREMENT)*sizeof(char)); _b->storage+=EC_BUFFER_INCREMENT; _b->ptr=_b->buf+endbyte; } else { celt_fatal("range encoder overflow\n"); } } *(_b->ptr++)=(unsigned char)_value; } void ec_byte_write4(ec_byte_buffer *_b,ec_uint32 _value){ ptrdiff_t endbyte; endbyte=_b->ptr-_b->buf; if(endbyte+4>_b->storage){ if (_b->resizable){ _b->buf=celt_realloc(_b->buf,(_b->storage+EC_BUFFER_INCREMENT)*sizeof(char)); _b->storage+=EC_BUFFER_INCREMENT; _b->ptr=_b->buf+endbyte; } else { celt_fatal("range encoder overflow\n"); } } *(_b->ptr++)=(unsigned char)_value; _value>>=8; *(_b->ptr++)=(unsigned char)_value; _value>>=8; *(_b->ptr++)=(unsigned char)_value; _value>>=8; *(_b->ptr++)=(unsigned char)_value; } void ec_byte_writecopy(ec_byte_buffer *_b,void *_source,long _bytes){ ptrdiff_t endbyte; endbyte=_b->ptr-_b->buf; if(endbyte+_bytes>_b->storage){ if (_b->resizable){ _b->storage=endbyte+_bytes+EC_BUFFER_INCREMENT; _b->buf=celt_realloc(_b->buf,_b->storage*sizeof(char)); _b->ptr=_b->buf+endbyte; } else { celt_fatal("range encoder overflow\n"); } } memmove(_b->ptr,_source,_bytes); _b->ptr+=_bytes; } void ec_byte_writeclear(ec_byte_buffer *_b){ celt_free(_b->buf); } void ec_enc_bits(ec_enc *_this,ec_uint32 _fl,int _ftb){ unsigned fl; unsigned ft; while(_ftb>EC_UNIT_BITS){ _ftb-=EC_UNIT_BITS; fl=(unsigned)(_fl>>_ftb)&EC_UNIT_MASK; ec_encode_bin(_this,fl,fl+1,EC_UNIT_BITS); } ft=1<<_ftb; fl=(unsigned)_fl&ft-1; ec_encode_bin(_this,fl,fl+1,_ftb); } void ec_enc_uint(ec_enc *_this,ec_uint32 _fl,ec_uint32 _ft){ unsigned ft; unsigned fl; int ftb; _ft--; ftb=EC_ILOG(_ft)&-!!_ft; if(ftb>EC_UNIT_BITS){ ftb-=EC_UNIT_BITS; ft=(_ft>>ftb)+1; fl=(unsigned)(_fl>>ftb); ec_encode(_this,fl,fl+1,ft); ec_enc_bits(_this,_fl,ftb); } else { ec_encode(_this,_fl,_fl+1,_ft+1); } }