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Add support for reading from FileStore by type

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This commit is contained in:
Gary Talent
2017-04-18 17:18:08 -05:00
parent 9b7c68efc9
commit 6e690ee98d
1 changed files with 34 additions and 4 deletions
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src/ox/fs/filestore.hpp
+34 -4
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@@ -202,6 +202,21 @@ class FileStore {
typename Header::FsSize_t readSize, void *data,
typename Header::FsSize_t *size);
/**
* Reads the "file" at the given id. You are responsible for freeing
* the data when done with it.
* @param id id of the "file"
* @param readStart where in the data to start reading
* @param readSize how much data to read
* @param data pointer to the pointer where the data is stored
* @param size pointer to a value that will be assigned the size of data
* @return 0 if read is a success
*/
template<typename T>
int read(InodeId_t id, typename Header::FsSize_t readStart,
typename Header::FsSize_t readSize, T *data,
typename Header::FsSize_t *size);
/**
* Reads the stat information of the inode of the given inode id.
* If the returned inode id is 0, then the requested inode was not found.
@@ -266,8 +281,9 @@ class FileStore {
* @param size pointer to a value that will be assigned the size of data
* @return 0 if read is a success
*/
template<typename T>
int read(Inode *inode, typename Header::FsSize_t readStart,
typename Header::FsSize_t readSize, void *data,
typename Header::FsSize_t readSize, T *data,
typename Header::FsSize_t *size);
/**
@@ -568,19 +584,28 @@ void FileStore<Header>::updateInodeAddress(InodeId_t id, typename Header::FsSize
template<typename Header>
int FileStore<Header>::read(InodeId_t id, void *data, typename Header::FsSize_t *size) {
auto inode = getInode(ptr<Inode*>(m_header.getRootInode()), id);
return inode ? read(inode, 0, inode->getDataLen(), data, size) : 1;
return inode ? read(inode, 0, inode->getDataLen(), (uint8_t*) data, size) : 1;
}
template<typename Header>
int FileStore<Header>::read(InodeId_t id, typename Header::FsSize_t readStart,
typename Header::FsSize_t readSize, void *data, typename Header::FsSize_t *size) {
auto inode = getInode(ptr<Inode*>(m_header.getRootInode()), id);
return inode ? read<uint8_t>(inode, readStart, readSize, (uint8_t*) data, size) : 1;
}
template<typename Header>
template<typename T>
int FileStore<Header>::read(InodeId_t id, typename Header::FsSize_t readStart,
typename Header::FsSize_t readSize, T *data, typename Header::FsSize_t *size) {
auto inode = getInode(ptr<Inode*>(m_header.getRootInode()), id);
return inode ? read(inode, readStart, readSize, data, size) : 1;
}
template<typename Header>
template<typename T>
int FileStore<Header>::read(Inode *inode, typename Header::FsSize_t readStart,
typename Header::FsSize_t readSize, void *data, typename Header::FsSize_t *size) {
typename Header::FsSize_t readSize, T *data, typename Header::FsSize_t *size) {
// be sure read size is not greater than what is available to read
if (inode->getDataLen() - readStart < readSize) {
readSize = inode->getDataLen() - readStart;
@@ -588,7 +613,12 @@ int FileStore<Header>::read(Inode *inode, typename Header::FsSize_t readStart,
if (size) {
*size = readSize;
}
ox_memcpy(data, inode->getData() + readStart, readSize);
readSize /= sizeof(T);
T *it = (T*) &(inode->getData()[readStart]);
for (typename Header::FsSize_t i = 0; i < readSize; i++) {
*(data++) = *(it++);
}
return 0;
}