drinkingtea/nostalgia
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Add read by type to new FileStore

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This commit is contained in:
Gary Talent 2018-03-15 21:39:07 -05:00
parent 8378af7564
commit e19e70e065
1 changed files with 44 additions and 0 deletions
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44
deps/ox/src/ox/fs/filestore/filestoretemplate.hpp vendored
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@ -68,6 +68,21 @@ class FileStoreTemplate: public FileStore {
Error read(InodeId_t id, FsSize_t readStart, FsSize_t readSize, void *data, FsSize_t *size); Error read(InodeId_t id, FsSize_t readStart, FsSize_t readSize, void *data, 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, FsSize_t readStart,
FsSize_t readSize, T *data,
FsSize_t *size);
StatInfo stat(InodeId_t id); StatInfo stat(InodeId_t id);
InodeId_t spaceNeeded(FsSize_t size); InodeId_t spaceNeeded(FsSize_t size);
@ -236,6 +251,35 @@ Error FileStoreTemplate<size_t>::read(InodeId_t id, FsSize_t readStart, FsSize_t
return 1; return 1;
} }
template<typename size_t>
template<typename T>
int FileStoreTemplate<size_t>::read(InodeId_t id, FsSize_t readStart,
FsSize_t readSize, T *data, FsSize_t *size) {
auto src = find(id);
if (src.valid()) {
auto srcData = src->data();
if (srcData.valid()) {
auto sub = srcData.subPtr(readStart, readSize);
if (sub.valid() && sub.size() % sizeof(T)) {
for (FsSize_t i = 0; i < sub.size() / sizeof(T); i++) {
// do byte-by-byte copy to ensure alignment is right when
// copying to final destination
T tmp;
for (size_t i = 0; i < sizeof(T); i++) {
*reinterpret_cast<uint8_t*>(&tmp)[i] = *(reinterpret_cast<uint8_t*>(sub.get()) + i);
}
*(data + i) = tmp;
}
if (size) {
*size = sub.size();
}
return 0;
}
}
}
return 1;
}
template<typename size_t> template<typename size_t>
typename FileStoreTemplate<size_t>::StatInfo FileStoreTemplate<size_t>::stat(InodeId_t id) { typename FileStoreTemplate<size_t>::StatInfo FileStoreTemplate<size_t>::stat(InodeId_t id) {
auto inode = find(id); auto inode = find(id);