lib3ddevil1/include/devil1tex.h

#ifndef DEVIL1TEX_H
#define DEVIL1TEX_H

#include <stdint.h>
#include <stdbool.h>

// disable struct padding
// to easily impose struct on plain data.
#pragma pack(push, 1)

struct TexturePack {
    char    id[4];
    int32_t   batchNumber;
    uint32_t  firstBatchOffset; // <format=hex>
    uint32_t  unknownA;
};

struct TextureBatchDescriptor{
    int32_t batchIdx;
    uint32_t hash;        // <format=hex>
    uint32_t texNumber;
    uint32_t unknownA[8]; // <format=hex>
    uint32_t textureSize; // <format=hex>
    uint32_t unknownB[30];
};

struct Texture {
    // size of array is defined by descriptor
    // textureSize
    unsigned char *data;
};

struct TextureBatch {
    // quantity of textures are defined by descriptor
    // texNumber
    struct Texture *batch;
};

#pragma pack(pop)

typedef struct { 
    void (* const printheader)   (struct TexturePack*);
    void (* const printbatchdesc)(struct TextureBatchDescriptor*);
    bool (* const getbatchdesc)  (struct TextureBatchDescriptor**,
                                  unsigned int,
                                  const char *,
                                  unsigned int);
    bool (* const getbatch)      (struct TextureBatch**, 
                                  unsigned int, 
                                  const char*,
                                  unsigned int);
    bool (* const gettextures)   (struct Texture*,
                                  unsigned int,
                                  const char*, 
                                  const unsigned int);
} fn_devil1tex;
extern fn_devil1tex const DEVIL1TEX;

// -------------------------------------------------------+
//                  Functions
// -------------------------------------------------------+

// Print Texture Pack Header.
static void printtph(struct TexturePack*);

// Print Texture Batch Descriptor.
static void printtbd(struct TextureBatchDescriptor*);

// Get Texture Batch Descriptor.
// ** = 'pass by reference' of a pointer to struct
static bool gettexdescriptor(struct TextureBatchDescriptor**,
                      unsigned int,
                      const char *,
                      unsigned int);

// Get Texture Batch.
// ** = 'pass by reference' of a pointer to struct
static bool gettexbatch(struct TextureBatch**, 
                 unsigned int, 
                 const char*,
                 unsigned int);

// Unpack Texture Batch
static bool unpacktexbatch(struct Texture*,
                    unsigned int,
                    const char*, 
                    const unsigned int);

#endif