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/* simple wrapper class to port stdio-based code easier */
#include <stdio.h>
#include <string.h>
#include "demolib_prefs.h"
#include "filereader.h"
#if DEMOLIB_DATA_FILEREADER
FileReader::FileReader(File *file)
{
this->curr_file = file;
this->position = 0;
}
FileReader::~FileReader()
{
delete this->curr_file;
}
size_t FileReader::fread(void *ptr, size_t size, size_t nmemb)
{
size_t i;
for (i = 0; i < nmemb; i++) {
if ((int)this->position + (int)size > (int)this->curr_file->data_length()) {
return i;
}
memcpy((char *)(ptr) + i * size, this->curr_file->get_data() + this->position, size);
this->position += size;
}
return i;
}
size_t FileReader::read(void *buf, size_t count)
{
if ((int)this->position + (int)count > (int)this->curr_file->data_length()) {
count = this->curr_file->data_length() - this->position;
}
memcpy(buf, this->curr_file->get_data() + this->position, count);
return count;
}
long FileReader::ftell()
{
return this->position;
}
int FileReader::fseek(long offset, int whence)
{
int real_offset;
switch (whence) {
case SEEK_SET:
real_offset = 0;
break;
case SEEK_CUR:
real_offset = this->position;
break;
case SEEK_END:
real_offset = this->curr_file->data_length();
break;
default:
return -1;
}
if (real_offset + offset < 0 ||
real_offset + offset > this->curr_file->data_length()) {
return -1;
}
this->position = real_offset + offset;
return 0;
}
#endif
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