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WebSocket permessage-deflate server implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| /* | ||
| copyright: Boaz Segev, 2017-2019 | ||
| license: MIT | ||
| Feel free to copy, use and enjoy according to the license specified. | ||
| */ | ||
| #ifndef H_WEBSOCKET_DEFLATE_H | ||
| /**\file | ||
| A single file WebSocket permessage-deflate wrapper | ||
| */ | ||
| #define H_WEBSOCKET_DEFLATE_H | ||
| #include <fiobj.h> | ||
| #include <stdlib.h> | ||
| #include <zlib.h> | ||
|
|
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| #define WS_CHUNK 16384 | ||
|
|
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| z_stream *new_z_stream() { | ||
| z_stream *strm = malloc(sizeof(*strm)); | ||
|
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| *strm = (z_stream){ | ||
| .zalloc = Z_NULL, | ||
| .zfree = Z_NULL, | ||
| .opaque = Z_NULL, | ||
| }; | ||
|
|
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| return strm; | ||
| } | ||
|
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| z_stream *new_deflator() { | ||
| z_stream *strm = new_z_stream(); | ||
|
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| int ret = deflateInit2(strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, | ||
| -MAX_WBITS, 4, Z_DEFAULT_STRATEGY); | ||
|
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| return strm; | ||
| } | ||
|
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| z_stream *new_inflator() { | ||
| z_stream *strm = new_z_stream(); | ||
|
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| inflateInit2(strm, -MAX_WBITS); | ||
|
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| return strm; | ||
| } | ||
|
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| int deflate_message(fio_str_info_s src, FIOBJ dest, z_stream *strm) { | ||
| int ret, flush; | ||
| unsigned have; | ||
| unsigned char out[WS_CHUNK]; | ||
|
|
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| strm->avail_in = src.len; | ||
| strm->next_in = src.data; | ||
|
|
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| do { | ||
| strm->avail_out = WS_CHUNK; | ||
| strm->next_out = out; | ||
| ret = deflate(strm, Z_SYNC_FLUSH); | ||
| have = WS_CHUNK - strm->avail_out; | ||
| fiobj_str_write(dest, out, have); | ||
| } while (strm->avail_out == 0); | ||
|
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| return Z_OK; | ||
| } | ||
|
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| int inflate_message(fio_str_info_s src, FIOBJ dest, z_stream *strm) { | ||
| int ret; | ||
| unsigned have; | ||
| unsigned char out[WS_CHUNK]; | ||
|
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| strm->avail_in = src.len; | ||
| strm->next_in = src.data; | ||
|
|
||
| do { | ||
| strm->avail_out = WS_CHUNK; | ||
| strm->next_out = out; | ||
| ret = inflate(strm, Z_SYNC_FLUSH); | ||
| switch (ret) { | ||
| case Z_NEED_DICT: | ||
| ret = Z_DATA_ERROR; | ||
| case Z_DATA_ERROR: | ||
| case Z_MEM_ERROR: | ||
| (void)inflateEnd(strm); | ||
| return ret; | ||
| } | ||
| have = WS_CHUNK - strm->avail_out; | ||
| fiobj_str_write(dest, out, have); | ||
| } while (strm->avail_out == 0); | ||
|
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| return ret; | ||
| } | ||
| #endif |
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