/* ****************************************************************************
* euint32 file_fread(File *file,euint32 offset, euint32 size,euint8 *buf)
* Description: This function reads 'size' bytes from 'file' starting at
* 'offset' and puts the result in '*buf'.
* Return value: amount of bytes actually read (can differ from the given
* size when the file was smaller
*/
euint32 file_fread(File *file,euint32 offset, euint32 size,euint8 *buf)
{
//OSTaskSuspend(1);
euint32 bytes_read=0,size_left=size,coffset=offset;
euint32 cclus,csec,cbyte;
euint32 rclus,rsec;
euint32 btr;
euint8 *tbuf;
if(!file_getAttr(file,FILE_STATUS_OPEN))return(0);
if(offset>=file->FileSize)
size_left=0; /* Offset check */
if( (offset+size > file->FileSize) && size_left!=0)
size_left=file->FileSize-offset;
while(size_left>0){
//printf("size_left = %d\n", size_left);
cclus = coffset/(512*file->fs->volumeId.SectorsPerCluster);
csec = (coffset/(512))%file->fs->volumeId.SectorsPerCluster;
cbyte = coffset%512;
if(cbyte!=0 || size_left<512){
btr = 512-(coffset%512)>=size_left?size_left:512-(coffset%512);
}else{
btr = 512;
}
if((fat_LogicToDiscCluster(file->fs,&(file->Cache),cclus))!=0){
return(0);
}
rclus=file->Cache.DiscCluster;
rsec=fs_clusterToSector(file->fs,rclus);
if(btr==512){
/*part_readBuf(file->fs->part,rsec+csec,buf+bytes_read);*/
part_directSectorRead(file->fs->part,rsec+csec,buf+bytes_read);
}else{
/*part_readBuf(file->fs->part,rsec+csec,tbuf);*/
tbuf = part_getSect(file->fs->part,rsec+csec,IOM_MODE_READONLY);
memCpy(tbuf+(coffset%512),buf+bytes_read,btr);
part_relSect(file->fs->part,tbuf);
}
coffset+=btr;
bytes_read+=btr;
size_left-=btr;
}
//OSTaskResume(1);
return(bytes_read);
}
/* ****************************************************************************
* unsigned long file_fread(File *file,unsigned long offset, unsigned long size,unsigned char *buf)
* Description: This function reads 'size' bytes from 'file' starting at
* 'offset' and puts the result in '*buf'.
* Return value: amount of bytes actually read (can differ from the given
* size when the file was smaller
*/
unsigned long file_fread(File *file,unsigned long offset, unsigned long size,unsigned char *buf)
{
unsigned long bytes_read=0,size_left=size,coffset=offset;
unsigned long cclus,csec,cbyte;
unsigned long rclus,rsec;
unsigned long btr;
unsigned char *tbuf;
if(!file_getAttr(file,FILE_STATUS_OPEN))return(0);
if(offset>=file->FileSize)
size_left=0; /* Offset check */
if( (offset+size > file->FileSize) && size_left!=0)
size_left=file->FileSize-offset;
while(size_left>0){
cclus = coffset/(512*file->fs->volumeId.SectorsPerCluster);
csec = (coffset/(512))%file->fs->volumeId.SectorsPerCluster;
cbyte = coffset%512;
if(cbyte!=0 || size_left<512){
btr = 512-(coffset%512)>=size_left?size_left:512-(coffset%512);
}else{
btr = 512;
}
if((fat_LogicToDiscCluster(file->fs,&(file->Cache),cclus))!=0){
return(0);
}
rclus=file->Cache.DiscCluster;
rsec=fs_clusterToSector(file->fs,rclus);
if(btr==512){
/*part_readBuf(file->fs->part,rsec+csec,buf+bytes_read);*/
part_directSectorRead(file->fs->part,rsec+csec,buf+bytes_read);
}else{
/*part_readBuf(file->fs->part,rsec+csec,tbuf);*/
tbuf = part_getSect(file->fs->part,rsec+csec,IOM_MODE_READONLY);
memCpy(tbuf+(coffset%512),buf+bytes_read,btr);
part_relSect(file->fs->part,tbuf);
}
coffset+=btr;
bytes_read+=btr;
size_left-=btr;
}
return(bytes_read);
}