#include "crunch.h"

#include <stdint.h>

#include <algorithm>

#include "crunch/crn_decomp.h"

bool crunch_unpack_level(const uint8_t* data, uint32_t data_size, uint32_t level_index, void** ret, uint32_t* ret_size) {

crnd::crn_texture_info tex_info;

if (!crnd::crnd_get_texture_info(data, data_size, &tex_info))

{

return false;

}

crnd::crnd_unpack_context pContext = crnd::crnd_unpack_begin(data, data_size);

if (!pContext)

{

return false;

}

const crn_uint32 width = std::max(1U, tex_info.m_width >> level_index);

const crn_uint32 height = std::max(1U, tex_info.m_height >> level_index);

const crn_uint32 blocks_x = std::max(1U, (width + 3) >> 2);

const crn_uint32 blocks_y = std::max(1U, (height + 3) >> 2);

const crn_uint32 row_pitch = blocks_x * crnd::crnd_get_bytes_per_dxt_block(tex_info.m_format);

const crn_uint32 total_face_size = row_pitch * blocks_y;

*ret = new uint8_t[total_face_size];

*ret_size = total_face_size;

if (!crnd::crnd_unpack_level(pContext, ret, total_face_size, row_pitch, level_index))

{

crnd::crnd_unpack_end(pContext);

return false;

}

crnd::crnd_unpack_end(pContext);

return true;

}