diff options
Diffstat (limited to 'drivers/opus/info.c')
| -rw-r--r-- | drivers/opus/info.c | 687 |
1 files changed, 687 insertions, 0 deletions
diff --git a/drivers/opus/info.c b/drivers/opus/info.c new file mode 100644 index 0000000000..f5ad2110be --- /dev/null +++ b/drivers/opus/info.c @@ -0,0 +1,687 @@ +/******************************************************************** + * * + * 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 2012 * + * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * + * * + ********************************************************************/ +#ifdef OPUS_HAVE_CONFIG_H +#include "opus_config.h" +#endif + +#include "internal.h" +#include <limits.h> +#include <string.h> + +static unsigned op_parse_uint16le(const unsigned char *_data){ + return _data[0]|_data[1]<<8; +} + +static int op_parse_int16le(const unsigned char *_data){ + int ret; + ret=_data[0]|_data[1]<<8; + return (ret^0x8000)-0x8000; +} + +static opus_uint32 op_parse_uint32le(const unsigned char *_data){ + return _data[0]|(opus_uint32)_data[1]<<8| + (opus_uint32)_data[2]<<16|(opus_uint32)_data[3]<<24; +} + +static opus_uint32 op_parse_uint32be(const unsigned char *_data){ + return _data[3]|(opus_uint32)_data[2]<<8| + (opus_uint32)_data[1]<<16|(opus_uint32)_data[0]<<24; +} + +int opus_head_parse(OpusHead *_head,const unsigned char *_data,size_t _len){ + OpusHead head; + if(_len<8)return OP_ENOTFORMAT; + if(memcmp(_data,"OpusHead",8)!=0)return OP_ENOTFORMAT; + if(_len<9)return OP_EBADHEADER; + head.version=_data[8]; + if(head.version>15)return OP_EVERSION; + if(_len<19)return OP_EBADHEADER; + head.channel_count=_data[9]; + head.pre_skip=op_parse_uint16le(_data+10); + head.input_sample_rate=op_parse_uint32le(_data+12); + head.output_gain=op_parse_int16le(_data+16); + head.mapping_family=_data[18]; + if(head.mapping_family==0){ + if(head.channel_count<1||head.channel_count>2)return OP_EBADHEADER; + if(head.version<=1&&_len>19)return OP_EBADHEADER; + head.stream_count=1; + head.coupled_count=head.channel_count-1; + if(_head!=NULL){ + _head->mapping[0]=0; + _head->mapping[1]=1; + } + } + else if(head.mapping_family==1){ + size_t size; + int ci; + if(head.channel_count<1||head.channel_count>8)return OP_EBADHEADER; + size=21+head.channel_count; + if(_len<size||head.version<=1&&_len>size)return OP_EBADHEADER; + head.stream_count=_data[19]; + if(head.stream_count<1)return OP_EBADHEADER; + head.coupled_count=_data[20]; + if(head.coupled_count>head.stream_count)return OP_EBADHEADER; + for(ci=0;ci<head.channel_count;ci++){ + if(_data[21+ci]>=head.stream_count+head.coupled_count + &&_data[21+ci]!=255){ + return OP_EBADHEADER; + } + } + if(_head!=NULL)memcpy(_head->mapping,_data+21,head.channel_count); + } + /*General purpose players should not attempt to play back content with + channel mapping family 255.*/ + else if(head.mapping_family==255)return OP_EIMPL; + /*No other channel mapping families are currently defined.*/ + else return OP_EBADHEADER; + if(_head!=NULL)memcpy(_head,&head,head.mapping-(unsigned char *)&head); + return 0; +} + +void opus_tags_init(OpusTags *_tags){ + memset(_tags,0,sizeof(*_tags)); +} + +void opus_tags_clear(OpusTags *_tags){ + int ci; + for(ci=_tags->comments;ci-->0;)_ogg_free(_tags->user_comments[ci]); + _ogg_free(_tags->user_comments); + _ogg_free(_tags->comment_lengths); + _ogg_free(_tags->vendor); +} + +/*Ensure there's room for up to _ncomments comments.*/ +static int op_tags_ensure_capacity(OpusTags *_tags,size_t _ncomments){ + char **user_comments; + int *comment_lengths; + size_t size; + if(OP_UNLIKELY(_ncomments>=(size_t)INT_MAX))return OP_EFAULT; + size=sizeof(*_tags->comment_lengths)*(_ncomments+1); + if(size/sizeof(*_tags->comment_lengths)!=_ncomments+1)return OP_EFAULT; + comment_lengths=(int *)_ogg_realloc(_tags->comment_lengths,size); + if(OP_UNLIKELY(comment_lengths==NULL))return OP_EFAULT; + comment_lengths[_ncomments]=0; + _tags->comment_lengths=comment_lengths; + size=sizeof(*_tags->user_comments)*(_ncomments+1); + if(size/sizeof(*_tags->user_comments)!=_ncomments+1)return OP_EFAULT; + user_comments=(char **)_ogg_realloc(_tags->user_comments,size); + if(OP_UNLIKELY(user_comments==NULL))return OP_EFAULT; + user_comments[_ncomments]=NULL; + _tags->user_comments=user_comments; + return 0; +} + +/*Duplicate a (possibly non-NUL terminated) string with a known length.*/ +static char *op_strdup_with_len(const char *_s,size_t _len){ + size_t size; + char *ret; + size=sizeof(*ret)*(_len+1); + if(OP_UNLIKELY(size<_len))return NULL; + ret=(char *)_ogg_malloc(size); + if(OP_LIKELY(ret!=NULL)){ + ret=(char *)memcpy(ret,_s,sizeof(*ret)*_len); + ret[_len]='\0'; + } + return ret; +} + +/*The actual implementation of opus_tags_parse(). + Unlike the public API, this function requires _tags to already be + initialized, modifies its contents before success is guaranteed, and assumes + the caller will clear it on error.*/ +static int opus_tags_parse_impl(OpusTags *_tags, + const unsigned char *_data,size_t _len){ + opus_uint32 count; + size_t len; + int ncomments; + int ci; + len=_len; + if(len<8)return OP_ENOTFORMAT; + if(memcmp(_data,"OpusTags",8)!=0)return OP_ENOTFORMAT; + if(len<16)return OP_EBADHEADER; + _data+=8; + len-=8; + count=op_parse_uint32le(_data); + _data+=4; + len-=4; + if(count>len)return OP_EBADHEADER; + if(_tags!=NULL){ + _tags->vendor=op_strdup_with_len((char *)_data,count); + if(_tags->vendor==NULL)return OP_EFAULT; + } + _data+=count; + len-=count; + if(len<4)return OP_EBADHEADER; + count=op_parse_uint32le(_data); + _data+=4; + len-=4; + /*Check to make sure there's minimally sufficient data left in the packet.*/ + if(count>len>>2)return OP_EBADHEADER; + /*Check for overflow (the API limits this to an int).*/ + if(count>(opus_uint32)INT_MAX-1)return OP_EFAULT; + if(_tags!=NULL){ + int ret; + ret=op_tags_ensure_capacity(_tags,count); + if(ret<0)return ret; + } + ncomments=(int)count; + for(ci=0;ci<ncomments;ci++){ + /*Check to make sure there's minimally sufficient data left in the packet.*/ + if((size_t)(ncomments-ci)>len>>2)return OP_EBADHEADER; + count=op_parse_uint32le(_data); + _data+=4; + len-=4; + if(count>len)return OP_EBADHEADER; + /*Check for overflow (the API limits this to an int).*/ + if(count>(opus_uint32)INT_MAX)return OP_EFAULT; + if(_tags!=NULL){ + _tags->user_comments[ci]=op_strdup_with_len((char *)_data,count); + if(_tags->user_comments[ci]==NULL)return OP_EFAULT; + _tags->comment_lengths[ci]=(int)count; + _tags->comments=ci+1; + } + _data+=count; + len-=count; + } + return 0; +} + +int opus_tags_parse(OpusTags *_tags,const unsigned char *_data,size_t _len){ + if(_tags!=NULL){ + OpusTags tags; + int ret; + opus_tags_init(&tags); + ret=opus_tags_parse_impl(&tags,_data,_len); + if(ret<0)opus_tags_clear(&tags); + else *_tags=*&tags; + return ret; + } + else return opus_tags_parse_impl(NULL,_data,_len); +} + +/*The actual implementation of opus_tags_copy(). + Unlike the public API, this function requires _dst to already be + initialized, modifies its contents before success is guaranteed, and assumes + the caller will clear it on error.*/ +static int opus_tags_copy_impl(OpusTags *_dst,const OpusTags *_src){ + char *vendor; + int ncomments; + int ret; + int ci; + vendor=_src->vendor; + _dst->vendor=op_strdup_with_len(vendor,strlen(vendor)); + if(OP_UNLIKELY(_dst->vendor==NULL))return OP_EFAULT; + ncomments=_src->comments; + ret=op_tags_ensure_capacity(_dst,ncomments); + if(OP_UNLIKELY(ret<0))return ret; + for(ci=0;ci<ncomments;ci++){ + int len; + len=_src->comment_lengths[ci]; + OP_ASSERT(len>=0); + _dst->user_comments[ci]=op_strdup_with_len(_src->user_comments[ci],len); + if(OP_UNLIKELY(_dst->user_comments[ci]==NULL))return OP_EFAULT; + _dst->comment_lengths[ci]=len; + _dst->comments=ci+1; + } + return 0; +} + +int opus_tags_copy(OpusTags *_dst,const OpusTags *_src){ + OpusTags dst; + int ret; + opus_tags_init(&dst); + ret=opus_tags_copy_impl(&dst,_src); + if(OP_UNLIKELY(ret<0))opus_tags_clear(&dst); + else *_dst=*&dst; + return 0; +} + +int opus_tags_add(OpusTags *_tags,const char *_tag,const char *_value){ + char *comment; + int tag_len; + int value_len; + int ncomments; + int ret; + ncomments=_tags->comments; + ret=op_tags_ensure_capacity(_tags,ncomments+1); + if(OP_UNLIKELY(ret<0))return ret; + tag_len=strlen(_tag); + value_len=strlen(_value); + /*+2 for '=' and '\0'.*/ + _tags->comment_lengths[ncomments]=0; + _tags->user_comments[ncomments]=comment= + (char *)_ogg_malloc(sizeof(*comment)*(tag_len+value_len+2)); + if(OP_UNLIKELY(comment==NULL))return OP_EFAULT; + memcpy(comment,_tag,sizeof(*comment)*tag_len); + comment[tag_len]='='; + memcpy(comment+tag_len+1,_value,sizeof(*comment)*(value_len+1)); + _tags->comment_lengths[ncomments]=tag_len+value_len+1; + _tags->comments=ncomments+1; + return 0; +} + +int opus_tags_add_comment(OpusTags *_tags,const char *_comment){ + int comment_len; + int ncomments; + int ret; + ncomments=_tags->comments; + ret=op_tags_ensure_capacity(_tags,ncomments+1); + if(OP_UNLIKELY(ret<0))return ret; + comment_len=(int)strlen(_comment); + _tags->comment_lengths[ncomments]=0; + _tags->user_comments[ncomments]=op_strdup_with_len(_comment,comment_len); + if(OP_UNLIKELY(_tags->user_comments[ncomments]==NULL))return OP_EFAULT; + _tags->comment_lengths[ncomments]=comment_len; + _tags->comments=ncomments+1; + return 0; +} + +int opus_tagcompare(const char *_tag_name,const char *_comment){ + return opus_tagncompare(_tag_name,strlen(_tag_name),_comment); +} + +int opus_tagncompare(const char *_tag_name,int _tag_len,const char *_comment){ + int ret; + OP_ASSERT(_tag_len>=0); + ret=op_strncasecmp(_tag_name,_comment,_tag_len); + return ret?ret:'='-_comment[_tag_len]; +} + +const char *opus_tags_query(const OpusTags *_tags,const char *_tag,int _count){ + char **user_comments; + int tag_len; + int found; + int ncomments; + int ci; + tag_len=strlen(_tag); + ncomments=_tags->comments; + user_comments=_tags->user_comments; + found=0; + for(ci=0;ci<ncomments;ci++){ + if(!opus_tagncompare(_tag,tag_len,user_comments[ci])){ + /*We return a pointer to the data, not a copy.*/ + if(_count==found++)return user_comments[ci]+tag_len+1; + } + } + /*Didn't find anything.*/ + return NULL; +} + +int opus_tags_query_count(const OpusTags *_tags,const char *_tag){ + char **user_comments; + int tag_len; + int found; + int ncomments; + int ci; + tag_len=strlen(_tag); + ncomments=_tags->comments; + user_comments=_tags->user_comments; + found=0; + for(ci=0;ci<ncomments;ci++){ + if(!opus_tagncompare(_tag,tag_len,user_comments[ci]))found++; + } + return found; +} + +int opus_tags_get_track_gain(const OpusTags *_tags,int *_gain_q8){ + char **comments; + int ncomments; + int ci; + comments=_tags->user_comments; + ncomments=_tags->comments; + /*Look for the first valid R128_TRACK_GAIN tag and use that.*/ + for(ci=0;ci<ncomments;ci++){ + if(opus_tagncompare("R128_TRACK_GAIN",15,comments[ci])==0){ + char *p; + opus_int32 gain_q8; + int negative; + p=comments[ci]+16; + negative=0; + if(*p=='-'){ + negative=-1; + p++; + } + else if(*p=='+')p++; + gain_q8=0; + while(*p>='0'&&*p<='9'){ + gain_q8=10*gain_q8+*p-'0'; + if(gain_q8>32767-negative)break; + p++; + } + /*This didn't look like a signed 16-bit decimal integer. + Not a valid R128_TRACK_GAIN tag.*/ + if(*p!='\0')continue; + *_gain_q8=(int)(gain_q8+negative^negative); + return 0; + } + } + return OP_FALSE; +} + +static int op_is_jpeg(const unsigned char *_buf,size_t _buf_sz){ + return _buf_sz>=11&&memcmp(_buf,"\xFF\xD8\xFF\xE0",4)==0 + &&(_buf[4]<<8|_buf[5])>=16&&memcmp(_buf+6,"JFIF",5)==0; +} + +/*Tries to extract the width, height, bits per pixel, and palette size of a + JPEG. + On failure, simply leaves its outputs unmodified.*/ +static void op_extract_jpeg_params(const unsigned char *_buf,size_t _buf_sz, + opus_uint32 *_width,opus_uint32 *_height, + opus_uint32 *_depth,opus_uint32 *_colors,int *_has_palette){ + if(op_is_jpeg(_buf,_buf_sz)){ + size_t offs; + offs=2; + for(;;){ + size_t segment_len; + int marker; + while(offs<_buf_sz&&_buf[offs]!=0xFF)offs++; + while(offs<_buf_sz&&_buf[offs]==0xFF)offs++; + marker=_buf[offs]; + offs++; + /*If we hit EOI* (end of image), or another SOI* (start of image), + or SOS (start of scan), then stop now.*/ + if(offs>=_buf_sz||(marker>=0xD8&&marker<=0xDA))break; + /*RST* (restart markers): skip (no segment length).*/ + else if(marker>=0xD0&&marker<=0xD7)continue; + /*Read the length of the marker segment.*/ + if(_buf_sz-offs<2)break; + segment_len=_buf[offs]<<8|_buf[offs+1]; + if(segment_len<2||_buf_sz-offs<segment_len)break; + if(marker==0xC0||(marker>0xC0&&marker<0xD0&&(marker&3)!=0)){ + /*Found a SOFn (start of frame) marker segment:*/ + if(segment_len>=8){ + *_height=_buf[offs+3]<<8|_buf[offs+4]; + *_width=_buf[offs+5]<<8|_buf[offs+6]; + *_depth=_buf[offs+2]*_buf[offs+7]; + *_colors=0; + *_has_palette=0; + } + break; + } + /*Other markers: skip the whole marker segment.*/ + offs+=segment_len; + } + } +} + +static int op_is_png(const unsigned char *_buf,size_t _buf_sz){ + return _buf_sz>=8&&memcmp(_buf,"\x89PNG\x0D\x0A\x1A\x0A",8)==0; +} + +/*Tries to extract the width, height, bits per pixel, and palette size of a + PNG. + On failure, simply leaves its outputs unmodified.*/ +static void op_extract_png_params(const unsigned char *_buf,size_t _buf_sz, + opus_uint32 *_width,opus_uint32 *_height, + opus_uint32 *_depth,opus_uint32 *_colors,int *_has_palette){ + if(op_is_png(_buf,_buf_sz)){ + size_t offs; + offs=8; + while(_buf_sz-offs>=12){ + ogg_uint32_t chunk_len; + chunk_len=op_parse_uint32be(_buf+offs); + if(chunk_len>_buf_sz-(offs+12))break; + else if(chunk_len==13&&memcmp(_buf+offs+4,"IHDR",4)==0){ + int color_type; + *_width=op_parse_uint32be(_buf+offs+8); + *_height=op_parse_uint32be(_buf+offs+12); + color_type=_buf[offs+17]; + if(color_type==3){ + *_depth=24; + *_has_palette=1; + } + else{ + int sample_depth; + sample_depth=_buf[offs+16]; + if(color_type==0)*_depth=sample_depth; + else if(color_type==2)*_depth=sample_depth*3; + else if(color_type==4)*_depth=sample_depth*2; + else if(color_type==6)*_depth=sample_depth*4; + *_colors=0; + *_has_palette=0; + break; + } + } + else if(*_has_palette>0&&memcmp(_buf+offs+4,"PLTE",4)==0){ + *_colors=chunk_len/3; + break; + } + offs+=12+chunk_len; + } + } +} + +static int op_is_gif(const unsigned char *_buf,size_t _buf_sz){ + return _buf_sz>=6&&(memcmp(_buf,"GIF87a",6)==0||memcmp(_buf,"GIF89a",6)==0); +} + +/*Tries to extract the width, height, bits per pixel, and palette size of a + GIF. + On failure, simply leaves its outputs unmodified.*/ +static void op_extract_gif_params(const unsigned char *_buf,size_t _buf_sz, + opus_uint32 *_width,opus_uint32 *_height, + opus_uint32 *_depth,opus_uint32 *_colors,int *_has_palette){ + if(op_is_gif(_buf,_buf_sz)&&_buf_sz>=14){ + *_width=_buf[6]|_buf[7]<<8; + *_height=_buf[8]|_buf[9]<<8; + /*libFLAC hard-codes the depth to 24.*/ + *_depth=24; + *_colors=1<<((_buf[10]&7)+1); + *_has_palette=1; + } +} + +/*The actual implementation of opus_picture_tag_parse(). + Unlike the public API, this function requires _pic to already be + initialized, modifies its contents before success is guaranteed, and assumes + the caller will clear it on error.*/ +static int opus_picture_tag_parse_impl(OpusPictureTag *_pic,const char *_tag, + unsigned char *_buf,size_t _buf_sz,size_t _base64_sz){ + opus_int32 picture_type; + opus_uint32 mime_type_length; + char *mime_type; + opus_uint32 description_length; + char *description; + opus_uint32 width; + opus_uint32 height; + opus_uint32 depth; + opus_uint32 colors; + opus_uint32 data_length; + opus_uint32 file_width; + opus_uint32 file_height; + opus_uint32 file_depth; + opus_uint32 file_colors; + int format; + int has_palette; + int colors_set; + size_t i; + /*Decode the BASE64 data.*/ + for(i=0;i<_base64_sz;i++){ + opus_uint32 value; + int j; + value=0; + for(j=0;j<4;j++){ + unsigned c; + unsigned d; + c=(unsigned char)_tag[4*i+j]; + if(c=='+')d=62; + else if(c=='/')d=63; + else if(c>='0'&&c<='9')d=52+c-'0'; + else if(c>='a'&&c<='z')d=26+c-'a'; + else if(c>='A'&&c<='Z')d=c-'A'; + else if(c=='='&&3*i+j>_buf_sz)d=0; + else return OP_ENOTFORMAT; + value=value<<6|d; + } + _buf[3*i]=(unsigned char)(value>>16); + if(3*i+1<_buf_sz){ + _buf[3*i+1]=(unsigned char)(value>>8); + if(3*i+2<_buf_sz)_buf[3*i+2]=(unsigned char)value; + } + } + i=0; + picture_type=op_parse_uint32be(_buf+i); + i+=4; + /*Extract the MIME type.*/ + mime_type_length=op_parse_uint32be(_buf+i); + i+=4; + if(mime_type_length>_buf_sz-32)return OP_ENOTFORMAT; + mime_type=(char *)_ogg_malloc(sizeof(*_pic->mime_type)*(mime_type_length+1)); + if(mime_type==NULL)return OP_EFAULT; + memcpy(mime_type,_buf+i,sizeof(*mime_type)*mime_type_length); + mime_type[mime_type_length]='\0'; + _pic->mime_type=mime_type; + i+=mime_type_length; + /*Extract the description string.*/ + description_length=op_parse_uint32be(_buf+i); + i+=4; + if(description_length>_buf_sz-mime_type_length-32)return OP_ENOTFORMAT; + description= + (char *)_ogg_malloc(sizeof(*_pic->mime_type)*(description_length+1)); + if(description==NULL)return OP_EFAULT; + memcpy(description,_buf+i,sizeof(*description)*description_length); + description[description_length]='\0'; + _pic->description=description; + i+=description_length; + /*Extract the remaining fields.*/ + width=op_parse_uint32be(_buf+i); + i+=4; + height=op_parse_uint32be(_buf+i); + i+=4; + depth=op_parse_uint32be(_buf+i); + i+=4; + colors=op_parse_uint32be(_buf+i); + i+=4; + /*If one of these is set, they all must be, but colors==0 is a valid value.*/ + colors_set=width!=0||height!=0||depth!=0||colors!=0; + if((width==0||height==0||depth==0)&&colors_set)return OP_ENOTFORMAT; + data_length=op_parse_uint32be(_buf+i); + i+=4; + if(data_length>_buf_sz-i)return OP_ENOTFORMAT; + /*Trim extraneous data so we don't copy it below.*/ + _buf_sz=i+data_length; + /*Attempt to determine the image format.*/ + format=OP_PIC_FORMAT_UNKNOWN; + if(mime_type_length==3&&strcmp(mime_type,"-->")==0){ + format=OP_PIC_FORMAT_URL; + /*Picture type 1 must be a 32x32 PNG.*/ + if(picture_type==1&&(width!=0||height!=0)&&(width!=32||height!=32)){ + return OP_ENOTFORMAT; + } + /*Append a terminating NUL for the convenience of our callers.*/ + _buf[_buf_sz++]='\0'; + } + else{ + if(mime_type_length==10 + &&op_strncasecmp(mime_type,"image/jpeg",mime_type_length)==0){ + if(op_is_jpeg(_buf+i,data_length))format=OP_PIC_FORMAT_JPEG; + } + else if(mime_type_length==9 + &&op_strncasecmp(mime_type,"image/png",mime_type_length)==0){ + if(op_is_png(_buf+i,data_length))format=OP_PIC_FORMAT_PNG; + } + else if(mime_type_length==9 + &&op_strncasecmp(mime_type,"image/gif",mime_type_length)==0){ + if(op_is_gif(_buf+i,data_length))format=OP_PIC_FORMAT_GIF; + } + else if(mime_type_length==0||(mime_type_length==6 + &&op_strncasecmp(mime_type,"image/",mime_type_length)==0)){ + if(op_is_jpeg(_buf+i,data_length))format=OP_PIC_FORMAT_JPEG; + else if(op_is_png(_buf+i,data_length))format=OP_PIC_FORMAT_PNG; + else if(op_is_gif(_buf+i,data_length))format=OP_PIC_FORMAT_GIF; + } + file_width=file_height=file_depth=file_colors=0; + has_palette=-1; + switch(format){ + case OP_PIC_FORMAT_JPEG:{ + op_extract_jpeg_params(_buf+i,data_length, + &file_width,&file_height,&file_depth,&file_colors,&has_palette); + }break; + case OP_PIC_FORMAT_PNG:{ + op_extract_png_params(_buf+i,data_length, + &file_width,&file_height,&file_depth,&file_colors,&has_palette); + }break; + case OP_PIC_FORMAT_GIF:{ + op_extract_gif_params(_buf+i,data_length, + &file_width,&file_height,&file_depth,&file_colors,&has_palette); + }break; + } + if(has_palette>=0){ + /*If we successfully extracted these parameters from the image, override + any declared values.*/ + width=file_width; + height=file_height; + depth=file_depth; + colors=file_colors; + } + /*Picture type 1 must be a 32x32 PNG.*/ + if(picture_type==1&&(format!=OP_PIC_FORMAT_PNG||width!=32||height!=32)){ + return OP_ENOTFORMAT; + } + } + /*Adjust _buf_sz instead of using data_length to capture the terminating NUL + for URLs.*/ + _buf_sz-=i; + memmove(_buf,_buf+i,sizeof(*_buf)*_buf_sz); + _buf=(unsigned char *)_ogg_realloc(_buf,_buf_sz); + if(_buf_sz>0&&_buf==NULL)return OP_EFAULT; + _pic->type=picture_type; + _pic->width=width; + _pic->height=height; + _pic->depth=depth; + _pic->colors=colors; + _pic->data_length=data_length; + _pic->data=_buf; + _pic->format=format; + return 0; +} + +int opus_picture_tag_parse(OpusPictureTag *_pic,const char *_tag){ + OpusPictureTag pic; + unsigned char *buf; + size_t base64_sz; + size_t buf_sz; + size_t tag_length; + int ret; + if(opus_tagncompare("METADATA_BLOCK_PICTURE",22,_tag)==0)_tag+=23; + /*Figure out how much BASE64-encoded data we have.*/ + tag_length=strlen(_tag); + if(tag_length&3)return OP_ENOTFORMAT; + base64_sz=tag_length>>2; + buf_sz=3*base64_sz; + if(buf_sz<32)return OP_ENOTFORMAT; + if(_tag[tag_length-1]=='=')buf_sz--; + if(_tag[tag_length-2]=='=')buf_sz--; + if(buf_sz<32)return OP_ENOTFORMAT; + /*Allocate an extra byte to allow appending a terminating NUL to URL data.*/ + buf=(unsigned char *)_ogg_malloc(sizeof(*buf)*(buf_sz+1)); + if(buf==NULL)return OP_EFAULT; + opus_picture_tag_init(&pic); + ret=opus_picture_tag_parse_impl(&pic,_tag,buf,buf_sz,base64_sz); + if(ret<0){ + opus_picture_tag_clear(&pic); + _ogg_free(buf); + } + else *_pic=*&pic; + return ret; +} + +void opus_picture_tag_init(OpusPictureTag *_pic){ + memset(_pic,0,sizeof(*_pic)); +} + +void opus_picture_tag_clear(OpusPictureTag *_pic){ + _ogg_free(_pic->description); + _ogg_free(_pic->mime_type); + _ogg_free(_pic->data); +} |