1/*
2 * Copyright © Microsoft Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24#include "dxil_buffer.h"
25#include <assert.h>
26
27void
28dxil_buffer_init(struct dxil_buffer *b, unsigned abbrev_width)
29{
30   blob_init(&b->blob);
31   b->buf = 0;
32   b->buf_bits = 0;
33
34   b->abbrev_width = abbrev_width;
35}
36
37void
38dxil_buffer_finish(struct dxil_buffer *b)
39{
40   blob_finish(&b->blob);
41}
42
43static bool
44flush_dword(struct dxil_buffer *b)
45{
46   assert(b->buf_bits >= 32 && b->buf_bits < 64);
47
48   uint32_t lower_bits = b->buf & UINT32_MAX;
49   if (!blob_write_bytes(&b->blob, &lower_bits, sizeof(lower_bits)))
50      return false;
51
52   b->buf >>= 32;
53   b->buf_bits -= 32;
54
55   return true;
56}
57
58bool
59dxil_buffer_emit_bits(struct dxil_buffer *b, uint32_t data, unsigned width)
60{
61   assert(b->buf_bits < 32);
62   assert(width > 0 && width <= 32);
63   assert((data & ~((UINT64_C(1) << width) - 1)) == 0);
64
65   b->buf |= ((uint64_t)data) << b->buf_bits;
66   b->buf_bits += width;
67
68   if (b->buf_bits >= 32)
69      return flush_dword(b);
70
71   return true;
72}
73
74bool
75dxil_buffer_emit_vbr_bits(struct dxil_buffer *b, uint64_t data,
76                          unsigned width)
77{
78   assert(width > 1 && width <= 32);
79
80   uint32_t tag = UINT32_C(1) << (width - 1);
81   uint32_t max = tag - 1;
82   while (data > max) {
83      uint32_t value = (data & max) | tag;
84      data >>= width - 1;
85
86      if (!dxil_buffer_emit_bits(b, value, width))
87         return false;
88   }
89
90   return dxil_buffer_emit_bits(b, data, width);
91}
92
93bool
94dxil_buffer_align(struct dxil_buffer *b)
95{
96   assert(b->buf_bits < 32);
97
98   if (b->buf_bits) {
99      b->buf_bits = 32;
100      return flush_dword(b);
101   }
102
103   return true;
104}
105