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POD File Format Derivates

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Jon Daniel edited this page Nov 14, 2021 · 82 revisions

All information here is to my best knowledge, is is not proven by any official reference manual by Terminal Reality.

POD files are simple container files housing other files like textures or models. File extension is pod.

There are various versions of the POD files. There are not compatible with each other. Each version can be identified by the first 4 bytes of the file.

  • file starts with POD6 see POD6
  • file starts with POD5 see POD5
  • file starts with POD4 see POD4
  • file starts with POD3 see POD3
  • file starts with POD2 see POD2
  • file starts with dxte see EPD
  • else see POD1 
/* main variable type sizes of POD file formats                                                            */
/* integer types */
typedef uint64_t                             pod_number64_t;
typedef int64_t                              pod_signed_number64_t;
typedef uint32_t                             pod_number32_t;
typedef int32_t                              pod_signed_number32_t;
typedef uint16_t                             pod_number16_t;
typedef pod_number32_t                       pod_number_t;
typedef pod_signed_number32_t                pod_signed_number_t;
typedef uint8_t                              pod_byte_t;
typedef uint16_t                             pod_word_t;
typedef uint32_t                             pod_double_word_t;
typedef uint64_t                             pod_quad_word_t;
/* floating and fixed point types */
typedef float                                pod_float32_t;
typedef double                               pod_float64_t;
typedef uint16_t                             pod_fixed16_t;
typedef uint32_t                             pod_fixed32_t;
/* boolean types */
typedef bool                                 pod_bool_t;
/* size and file offset types */
typedef size_t                               pod_size_t;
typedef ssize_t                              pod_ssize_t;
typedef fpos_t                               pod_fpos_t;
typedef off_t                                pod_off_t;
/* character and string types */
typedef int8_t                               pod_char_t;
typedef wchar_t                              pod_wchar_t;
typedef pod_char_t*                          pod_string_t;
typedef wchar_t*                             pod_wchar_string_t;
/* time types */
typedef int32_t                              pod_time32_t;
typedef int64_t                              pod_time64_t;
typedef pod_time32_t                         pod_time_t;
/* file handle types */
typedef pod_char_t*                          pod_path_t;
typedef DIR*                                 pod_dir_t;
typedef FILE*                                pod_file_t;
/* constants common to all POD file formats                              */
#define POD_NUMBER_SIZE                      (sizeof(pod_number_t))
#define POD_CHAR_SIZE                        (sizeof(pod_char_t))
#define POD_BYTE_SIZE                        (sizeof(pod_byte_t))
#define POD_TIME_SIZE                        (sizeof(pod_time_t))
#define POD_COMMENT_SIZE                     (80)
#define EPD_COMMENT_SIZE                     (256)
#define POD_HEADER_CHECKSUM_DEFAULT          0x44424247
#define POD_ENTRY_CHECKSUM_DEFAULT           0x20444542
#define POD_ENTRY_TIMESTAMP_DEFAULT          0x42494720
#define POD_HEADER_UNKNOWN10C_DEFAULT        0x58585858
#define POD_IDENT_SIZE                       POD_NUMBER_SIZE

pod_string_t pod_ctime(pod_time_t* time32)
{
	struct tm tm;
	errno_t ret = _localtime32_s(&tm, time32);
	if(ret != 0)
	{
		fprintf(stderr, "%s\n", strerror(ret));
		return 0;
	}
	__time64_t time64 = _mktime64(&tm);
        pod_string_t str = _ctime64(&time64);
        str[strcspn ( str, "\n" )] = '\0';
	return str;
}

typedef enum pod_ident_type_e = {
    POD1 = 0, POD2, POD3, POD4, POD5, POD6, EPD,
    POD_IDENT_TYPE_SIZE,
} pod_ident_type_t;

/* map pod ident type enum id to file magic ident null terminated string */
char POD_IDENT[ POD_IDENT_TYPE_SIZE ][ POD_IDENT_SIZE + 1 ] = { 
    "\0POD1", "POD2\0", "POD3\0", 
    "POD4\0", "POD5\0", "POD6\0", "dtxe\0"
};

typedef enum pod_string_size_e = {
    POD_STRING_4=4, POD_STRING_8=8, POD_STRING_12=12,
    POD_STRING_16=16, POD_STRING_32=32, POD_STRING_48=48,
    POD_STRING_64=64, POD_STRING_80=80, POD_STRING_128=128,
    POD_STRING_256=256, POD_STRING_264=264, POD_STRING_SIZE=7,
} pod_string_size_t;

size_t pod_strlen_min(size_t len)
{
        return (len <= POD_STRING_4   ? POD_STRING_4   :
                len <= POD_STRING_8   ? POD_STRING_8   :
                len <= POD_STRING_12  ? POD_STRING_12  :
                len <= POD_STRING_16  ? POD_STRING_16  :
                len <= POD_STRING_32  ? POD_STRING_32  : 
                len <= POD_STRING_48  ? POD_STRING_48  :
                len <= POD_STRING_64  ? POD_STRING_64  :
                len <= POD_STRING_80  ? POD_STRING_80  :
                len <= POD_STRING_128 ? POD_STRING_128 :
                len <= POD_STRING_256 ? POD_STRING_256 :
                                        POD_STRING_264);
}

pod_filename_length_t filenames_len[header.file_count];

/* get the length of every filename string */
for (int i = 0; i < pod_header.file_count; i++)
        filename_len[i] = pod_strlen_min(strlen(filenames + entries[i].path_offset));

Algorithms

Checksums

POD2 checksum algorihm is CRC-CCITT32 derived of:

and integrated updated into

CRC-CCITT32 variant published and copyrighted since 1986 by:

Status

TODO

  • POD3 format needs decompile BloodRayne 2 demo to retrieve CRC algorithm and unknown field names

Done

  • POD2 format completely analyzed and structure documented in C pseudo code

  • POD6 format completely analyzed and structure documented in C pseudo code

All information here is to my best knowledge, is is not proven by any official reference manual by Microsoft or Terminal Reality.

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