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/*
* Copyright © Microsoft Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "dxil_buffer.h"
#include <assert.h>
void
dxil_buffer_init(struct dxil_buffer *b, unsigned abbrev_width)
{
blob_init(&b->blob);
b->buf = 0;
b->buf_bits = 0;
b->abbrev_width = abbrev_width;
}
void
dxil_buffer_finish(struct dxil_buffer *b)
{
blob_finish(&b->blob);
}
static bool
flush_dword(struct dxil_buffer *b)
{
assert(b->buf_bits >= 32 && b->buf_bits < 64);
uint32_t lower_bits = b->buf & UINT32_MAX;
if (!blob_write_bytes(&b->blob, &lower_bits, sizeof(lower_bits)))
return false;
b->buf >>= 32;
b->buf_bits -= 32;
return true;
}
bool
dxil_buffer_emit_bits(struct dxil_buffer *b, uint32_t data, unsigned width)
{
assert(b->buf_bits < 32);
assert(width > 0 && width <= 32);
assert((data & ~((UINT64_C(1) << width) - 1)) == 0);
b->buf |= ((uint64_t)data) << b->buf_bits;
b->buf_bits += width;
if (b->buf_bits >= 32)
return flush_dword(b);
return true;
}
bool
dxil_buffer_emit_vbr_bits(struct dxil_buffer *b, uint64_t data,
unsigned width)
{
assert(width > 1 && width <= 32);
uint32_t tag = UINT32_C(1) << (width - 1);
uint32_t max = tag - 1;
while (data > max) {
uint32_t value = (data & max) | tag;
data >>= width - 1;
if (!dxil_buffer_emit_bits(b, value, width))
return false;
}
return dxil_buffer_emit_bits(b, data, width);
}
bool
dxil_buffer_align(struct dxil_buffer *b)
{
assert(b->buf_bits < 32);
if (b->buf_bits) {
b->buf_bits = 32;
return flush_dword(b);
}
return true;
}
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