Function ChunkFile_Read

src/file.c:1064–1102

* Read bytes from a chunk file into a buffer. * * @param index The index given by ChunkFile_Open() of the file. * @param chunk The chunk to read from. * @param buffer The buffer to read into. * @param length The amount of bytes to read. * @return The amount of bytes truly read, or 0 if there was a failure. */

 * @return The amount of bytes truly read, or 0 if there was a failure.
 */
uint32 ChunkFile_Read(uint8 index, uint32 chunk, void *buffer, uint32 buflen)
{
	uint32 value = 0;
	uint32 length = 0;
	bool first = true;

	while (true) {
		if (File_Read(index, &value, 4) != 4 && !first) return 0;

		if (value == 0 && File_Read(index, &value, 4) != 4 && !first) return 0;

		if (File_Read(index, &length, 4) != 4 && !first) return 0;

		length = HTOBE32(length);

		if (value == chunk) {
			buflen = min(buflen, length);

			File_Read(index, buffer, buflen);

			length += 1;
			length &= 0xFFFFFFFE;

			if (buflen < length) File_Seek(index, length - buflen, 1);

			return buflen;
		}

		if (first) {
			File_Seek(index, 12, 0);
			first = false;
			continue;
		}

		length += 1;
		length &= 0xFFFFFFFE;
		File_Seek(index, length, 1);
	}
}