void freeResponse(struct Response *resp)
{
if (resp) {
freeResponseBuffer(resp->body);
freeResponseBuffer(resp->header);
free(resp);
resp = NULL;
}
}
static int hdfsReadImpl(hdfsFS fs, hdfsFile file, void* buffer, tSize off,
tSize length, tSize *numRead)
{
int ret = 0;
char *url = NULL;
struct Response *resp = NULL;
if (fs == NULL || file == NULL || file->type != INPUT || buffer == NULL ||
length < 0) {
ret = EINVAL;
goto done;
}
if (length == 0) {
// Special case: the user supplied a buffer of zero length, so there is
// nothing to do.
*numRead = 0;
goto done;
}
resp = calloc(1, sizeof(*resp)); // resp is actually a pointer type
if (!resp) {
ret = ENOMEM;
goto done;
}
ret = initResponseBuffer(&(resp->header));
if (ret) {
goto done;
}
ret = initResponseBuffer(&(resp->body));
if (ret) {
goto done;
}
memset(buffer, 0, length);
resp->body->content = buffer;
resp->body->remaining = length;
ret = createUrlForOPEN(fs->nn, fs->port, file->file->absPath,
fs->userName, off, length, &url);
if (ret) {
goto done;
}
ret = launchOPEN(url, resp);
if (ret) {
goto done;
}
ret = parseOPEN(resp->header->content, resp->body->content);
if (ret == -1) {
// Special case: if parseOPEN returns -1, we asked for a byte range
// with outside what the file contains. In this case, hdfsRead and
// hdfsPread return 0, meaning end-of-file.
*numRead = 0;
} else if (ret == 0) {
*numRead = (tSize) resp->body->offset;
}
done:
if (resp) {
freeResponseBuffer(resp->header);
free(resp->body);
}
free(resp);
free(url);
return ret;
}