| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (trans_stream_pipe.c). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | |
| 26 | #include <streams/trans_stream.h> |
| 27 | |
| 28 | struct pipe_trans_stream |
| 29 | { |
| 30 | const uint8_t *in; |
| 31 | uint8_t *out; |
| 32 | uint32_t in_size, out_size; |
| 33 | }; |
| 34 | |
| 35 | static void *pipe_stream_new(void) |
| 36 | { |
| 37 | struct pipe_trans_stream *stream = |
| 38 | (struct pipe_trans_stream*)malloc(sizeof(*stream)); |
| 39 | if (!stream) |
| 40 | return NULL; |
| 41 | |
| 42 | stream->in = NULL; |
| 43 | stream->out = NULL; |
| 44 | stream->in_size = 0; |
| 45 | stream->out_size = 0; |
| 46 | |
| 47 | return stream; |
| 48 | } |
| 49 | |
| 50 | static void pipe_stream_free(void *data) |
| 51 | { |
| 52 | free(data); |
| 53 | } |
| 54 | |
| 55 | static void pipe_set_in(void *data, const uint8_t *in, uint32_t in_size) |
| 56 | { |
| 57 | struct pipe_trans_stream *p = (struct pipe_trans_stream *) data; |
| 58 | |
| 59 | if (!p) |
| 60 | return; |
| 61 | |
| 62 | p->in = in; |
| 63 | p->in_size = in_size; |
| 64 | } |
| 65 | |
| 66 | static void pipe_set_out(void *data, uint8_t *out, uint32_t out_size) |
| 67 | { |
| 68 | struct pipe_trans_stream *p = (struct pipe_trans_stream *) data; |
| 69 | |
| 70 | if (!p) |
| 71 | return; |
| 72 | |
| 73 | p->out = out; |
| 74 | p->out_size = out_size; |
| 75 | } |
| 76 | |
| 77 | static bool pipe_trans( |
| 78 | void *data, bool flush, |
| 79 | uint32_t *rd, uint32_t *wn, |
| 80 | enum trans_stream_error *error) |
| 81 | { |
| 82 | struct pipe_trans_stream *p = (struct pipe_trans_stream *) data; |
| 83 | |
| 84 | if (p->out_size < p->in_size) |
| 85 | { |
| 86 | memcpy(p->out, p->in, p->out_size); |
| 87 | *rd = *wn = p->out_size; |
| 88 | p->in += p->out_size; |
| 89 | p->out += p->out_size; |
| 90 | *error = TRANS_STREAM_ERROR_BUFFER_FULL; |
| 91 | return false; |
| 92 | } |
| 93 | |
| 94 | memcpy(p->out, p->in, p->in_size); |
| 95 | *rd = *wn = p->in_size; |
| 96 | p->in += p->in_size; |
| 97 | p->out += p->in_size; |
| 98 | *error = TRANS_STREAM_ERROR_NONE; |
| 99 | return true; |
| 100 | } |
| 101 | |
| 102 | const struct trans_stream_backend pipe_backend = { |
| 103 | "pipe", |
| 104 | &pipe_backend, |
| 105 | pipe_stream_new, |
| 106 | pipe_stream_free, |
| 107 | NULL, |
| 108 | pipe_set_in, |
| 109 | pipe_set_out, |
| 110 | pipe_trans |
| 111 | }; |