/********************************************************************
 * Berry module `unishox`
 * 
 * To use: `import unishox`
 * 
 * Allows to respond to HTTP request
 *******************************************************************/

#ifdef USE_UNISHOX_COMPRESSION

#include "be_constobj.h"
#include "be_mapping.h"
#include <string.h>
#include "unishox.h"

extern Unishox compressor;

/*********************************************************************************************\
 * Native functions mapped to Berry functions
 * 
 * import unishox
 * 
 * 
\*********************************************************************************************/
static int be_ntv_unishox_compress(bvm *vm) {
  int32_t argc = be_top(vm); // Get the number of arguments
  if (argc == 1 && be_isstring(vm, 1)) {
    const char * s = be_tostring(vm, 1);
    // do a dry-run to know the compressed size
    int32_t compressed_size = compressor.unishox_compress(s, strlen(s), (char*) nullptr, 0);
    if (compressed_size < 0) {
      be_raise(vm, "internal_error", nullptr);
    }
    void * buf = be_pushbytes(vm, NULL, compressed_size);
    if (compressed_size > 0) {
      int32_t ret = compressor.unishox_compress(s, strlen(s), (char*) buf, compressed_size+5);  // We expand by 4 the buffer size to avoid an error, but we are sure it will not overflow (see unishox implementation)
      if (ret < 0 || ret != compressed_size) {
        be_raisef(vm, "internal_error", "unishox size=%i ret=%i", compressed_size, ret);
      }
    }
    be_return(vm);
  }
  be_raise(vm, "type_error", nullptr);
}

static int be_ntv_unishox_decompress(bvm *vm) {
  int32_t argc = be_top(vm); // Get the number of arguments
  if (argc == 1 && be_isbytes(vm, 1)) {
    size_t len;
    const void * buf = be_tobytes(vm, 1, &len);
    if (len == 0) {
      be_pushstring(vm, "");
    } else {
      int32_t decomp_size = compressor.unishox_decompress((const char*)buf, len, (char*) nullptr, 0);
      if (decomp_size < 0) {
        be_raise(vm, "internal_error", nullptr);
      }
      if (decomp_size == 0) {
        be_pushstring(vm, "");
      } else {
        void * buf_out = be_pushbuffer(vm, decomp_size);
        int32_t ret = compressor.unishox_decompress((const char*)buf, len, (char*) buf_out, decomp_size);
        if (ret < 0 || ret != decomp_size) {
          be_raisef(vm, "internal_error", "unishox size=%i ret=%i", decomp_size, ret);
        }
        be_pushnstring(vm, (const char*) buf_out, decomp_size);
      }
    }
    be_return(vm);
  }
  be_raise(vm, "type_error", nullptr);
}


/* @const_object_info_begin
module unishox (scope: global) {
    decompress, func(be_ntv_unishox_decompress)
    compress, func(be_ntv_unishox_compress)
}
@const_object_info_end */
#include "be_fixed_unishox.h"

#endif // USE_UNISHOX_COMPRESSION