/**
* Given the full path to a file, calculate and return the number of the final chunk in the file.
* The final chunk nunber is a function of the size of the file and the specified chunk size. It
* is 0-based and is never negative. A file of size 0 has a final chunk number of 0.
*
* @param [in] filePath The full path to a file.
* @param [in] chunkSize The size of the chunks to break the file in to.
*
* @return The number of the final chunk required to transfer the specified file.
*/
static u_int64_t
_getFinalChunkNumberOfFile(const char *filePath, uint32_t chunkSize)
{
size_t fileSize = tutorialFileIO_GetFileSize(filePath);
uint64_t totalNumberOfChunksInFile = _getNumberOfChunksRequired(fileSize, chunkSize);
// If the file size == 0, the the final chunk number is 0. Else, it's one less
// than the number of chunks in the file.
return totalNumberOfChunksInFile > 0 ? (totalNumberOfChunksInFile - 1) : 0;
}
PARCBuffer *
tutorialFileIO_CreateDirectoryListing(const char *directoryName)
{
DIR *directory = opendir(directoryName);
assertNotNull(directory, "Couldn't open directory '%s' for reading.", directoryName);
PARCBufferComposer *directoryListing = parcBufferComposer_Create();
struct dirent *entry;
while ((entry = readdir(directory)) != NULL) {
switch (entry->d_type) {
case DT_REG: {
// a regular file
// We need the full file path to check its size.
PARCBufferComposer *fullFilePath = parcBufferComposer_Create();
parcBufferComposer_Format(fullFilePath, "%s/%s", directoryName, entry->d_name);
PARCBuffer *fileNameBuffer = parcBufferComposer_ProduceBuffer(fullFilePath);
char *fullFilePathString = parcBuffer_ToString(fileNameBuffer);
parcBuffer_Release(&fileNameBuffer);
if (tutorialFileIO_IsFileAvailable(fullFilePathString)) {
parcBufferComposer_Format(directoryListing, " %s (%zu bytes)\n",
entry->d_name, tutorialFileIO_GetFileSize(fullFilePathString));
}
parcBufferComposer_Release(&fullFilePath);
parcMemory_Deallocate((void **) &fullFilePathString);
break;
}
case DT_LNK:
case DT_DIR:
default:
// ignore everything but regular files
break;
}
}
closedir(directory);
PARCBuffer *result = parcBufferComposer_ProduceBuffer(directoryListing);
parcBufferComposer_Release(&directoryListing);
return result;
}
