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/*
* Copyright (C) 2021 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2021 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-plugin-fw
* Created on: 7 дек. 2021 г.
*
* lsp-plugin-fw is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-plugin-fw is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-plugin-fw. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_PLUG_FW_WRAP_VST2_CHUNK_H_
#define LSP_PLUG_IN_PLUG_FW_WRAP_VST2_CHUNK_H_
#include <lsp-plug.in/plug-fw/version.h>
#include <lsp-plug.in/common/endian.h>
#include <lsp-plug.in/common/types.h>
#include <lsp-plug.in/common/status.h>
#include <lsp-plug.in/stdlib/stdlib.h>
#include <lsp-plug.in/stdlib/string.h>
namespace lsp
{
namespace vst2
{
/**
* VST plugin state chunk generator
*/
typedef struct chunk_t
{
uint8_t *data;
size_t offset;
size_t capacity;
status_t res;
explicit chunk_t()
{
data = NULL;
offset = 0;
capacity = 0;
res = STATUS_OK;
}
~chunk_t()
{
if (data != NULL)
{
::free(data);
data = NULL;
}
offset = 0;
capacity = 0;
}
void clear()
{
offset = 0;
res = STATUS_OK;
}
bool ensure_capacity(size_t count)
{
size_t cap = offset + count;
if (cap <= capacity)
return true;
cap += (cap >> 1);
uint8_t *ptr = reinterpret_cast<uint8_t *>(::realloc(data, cap));
if (ptr == NULL)
{
res = STATUS_NO_MEM;
return false;
}
data = ptr;
capacity = cap;
return true;
}
size_t write(const void *bytes, size_t count)
{
if (res != STATUS_OK)
return 0;
if (!ensure_capacity(count))
return 0;
size_t off = offset;
::memcpy(&data[offset], bytes, count);
offset += count;
return off;
}
template <class T>
size_t write(T value)
{
if (res != STATUS_OK)
return 0;
if (!ensure_capacity(sizeof(value)))
return 0;
size_t off = offset;
IF_UNALIGNED_MEMORY_SAFE(
*reinterpret_cast<T *>(&data[off]) = CPU_TO_BE(value);
)
IF_UNALIGNED_MEMORY_UNSAFE(
value = CPU_TO_BE(value);
::memcpy(&data[off], &value, sizeof(value));
)
offset += sizeof(value);
return off;
}
template <class T>
bool write_at(size_t position, T value)
{
if (res != STATUS_OK)
return false;
if ((offset - position) < sizeof(T))
{
res = STATUS_OVERFLOW;
return false;
}
IF_UNALIGNED_MEMORY_SAFE(
*reinterpret_cast<T *>(&data[position]) = CPU_TO_BE(value);
)
IF_UNALIGNED_MEMORY_UNSAFE(
value = CPU_TO_BE(value);
::memcpy(&data[position], &value, sizeof(value));
)
return true;
}
inline size_t write_string(const char *str)
{
if (res != STATUS_OK)
return 0;
size_t slen = ::strlen(str) + 1;
if (!ensure_capacity(slen))
return 0;
size_t off = offset;
::memcpy(&data[offset], str, slen);
offset += slen;
return off;
}
inline size_t write_byte(int b)
{
if (res != STATUS_OK)
return 0;
if (!ensure_capacity(sizeof(uint8_t)))
return 0;
size_t off = offset;
data[offset++] = uint8_t(b);
return off;
}
template <class T>
inline T *fetch(size_t offset)
{
return reinterpret_cast<T *>(&data[offset]);
}
} chunk_t;
} /* namespace vst2 */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_PLUG_FW_WRAP_VST2_CHUNK_H_ */
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