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#include "c_buffer.h"
static void c_buffer_expand_for_write(c_buffer_t *buffer, size_t write_size)
{
size_t capacity = c_buffer_capacity(buffer);
size_t size = c_buffer_size(buffer);
size_t required_capacity = size + write_size;
if (capacity < 1)
capacity = 1;
do {
capacity *= 2;
} while (capacity < required_capacity);
buffer->data = xrealloc(buffer->data, capacity);
buffer->data_end = buffer->data + size;
buffer->capacity_end = buffer->data + capacity;
}
void c_buffer_zero_pad_for_alignment(c_buffer_t *buffer, size_t alignment)
{
size_t unaligned_bytes = c_buffer_size(buffer) % alignment;
if (unaligned_bytes) {
size_t pad_size = alignment - unaligned_bytes;
uint8_t *padding = c_buffer_extend_for_write(buffer, pad_size);
memset(padding, 0, pad_size);
}
}
void c_buffer_reserve_for_write(c_buffer_t *buffer, size_t write_size)
{
uint8_t *write_end = buffer->data_end + write_size;
if (write_end > buffer->capacity_end) {
c_buffer_expand_for_write(buffer, write_size);
}
}
void c_buffer_write(c_buffer_t *buffer, void *write_data, size_t write_size)
{
c_buffer_reserve_for_write(buffer, write_size);
memcpy(buffer->data_end, write_data, write_size);
buffer->data_end += write_size;
}
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