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* stream: remove unused read_chunk fieldwm42019-11-071-2/+0
| | | | | | | | | | | | | It was set, but its value was never used. The stream cache used to use it, but it was removed. It controlled how much data it tried to read from the underlying stream at once. The user can now control the buffer size with --stream-buffer-size, which achieves a similar effect, because the stream will in the common case read half of the buffer size at once. In fact, the new default size is 128KB, i.e. 64KB read size, which is as much as stream_file and stream_cb requested by default. stream_memory requested more, but it doesn't matter anyway. Only stream_smb set a larger size with 128KB.
* stream: replace STREAM_CTRL_GET_SIZE with a proper entrypointwm42019-11-071-7/+3
| | | | | This is overlay convoluted as a stream control, and important enough to warrant "first class" functionality.
* stream: change buffer argument types from char* to void*wm42019-11-071-1/+1
| | | | | | | This is slightly better, although not much, and ultimately doesn't matter. The public API in stream_cb.h also uses char*, but can't change that.
* stream: rearrange open functionswm42019-09-291-4/+12
| | | | | | | | | | | | | | | | Add yet another variant of the stream open function. This time, make it so that it's possible to add new open parameters in an extendable way, which should put an end to having to change this every other year. Effectively get rid of the overly special stream_create_instance() function and use the new one instead, which requires changes in stream_concat.c and stream_memory.c. The function is still in private in stream.c, but I preferred to make the mentioned users go through the new function for orthogonality. The error handling (mostly logging) was adjusted accordingly. This should not have any functional changes. (To preempt any excuses, I didn't actually test stream_concat and stream_memory.)
* stream: add a generic concat implementationwm42019-09-191-0/+160
This is not available to users. It can be used only though the stream_concat_open(). It's unused yet; to be used in the following commit.