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HATPC/engine/rres.c

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/***********************************************************************************
*
* RRES IMPLEMENTATION
*
************************************************************************************/
#include "rres.h"
// Boolean type
#if (defined(__STDC__) && __STDC_VERSION__ >= 199901L) || (defined(_MSC_VER) && _MSC_VER >= 1800)
#include <stdbool.h>
#elif !defined(__cplusplus) && !defined(bool)
typedef enum bool { false = 0, true = !false } bool;
#define RL_BOOL_TYPE
#endif
#include <stdlib.h> // Required for: malloc(), free()
#include <stdio.h> // Required for: FILE, fopen(), fseek(), fread(), fclose()
#include <string.h> // Required for: memcpy(), memcmp()
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
//...
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
//...
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
static const char *password = NULL; // Password pointer, managed by user libraries
//----------------------------------------------------------------------------------
// Module Internal Functions Declaration
//----------------------------------------------------------------------------------
// Load resource chunk packed data into our data struct
static rresResourceChunkData rresLoadResourceChunkData(rresResourceChunkInfo info, void *packedData);
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
// Load one resource chunk for provided id
rresResourceChunk rresLoadResourceChunk(const char *fileName, unsigned int rresId)
{
rresResourceChunk chunk = { 0 };
FILE *rresFile = fopen(fileName, "rb");
if (rresFile == NULL) RRES_LOG("RRES: WARNING: [%s] rres file could not be opened\n", fileName);
else
{
RRES_LOG("RRES: INFO: Loading resource from file: %s\n", fileName);
rresFileHeader header = { 0 };
// Read rres file header
fread(&header, sizeof(rresFileHeader), 1, rresFile);
// Verify file signature: "rres" and file version: 100
if (((header.id[0] == 'r') && (header.id[1] == 'r') && (header.id[2] == 'e') && (header.id[3] == 's')) && (header.version == 100))
{
bool found = false;
// Check all available chunks looking for the requested id
for (int i = 0; i < header.chunkCount; i++)
{
rresResourceChunkInfo info = { 0 };
// Read resource info header
fread(&info, sizeof(rresResourceChunkInfo), 1, rresFile);
// Check if resource id is the requested one
if (info.id == rresId)
{
found = true;
RRES_LOG("RRES: INFO: Found requested resource id: 0x%08x\n", info.id);
RRES_LOG("RRES: %c%c%c%c: Id: 0x%08x | Base size: %i | Packed size: %i\n", info.type[0], info.type[1], info.type[2], info.type[3], info.id, info.baseSize, info.packedSize);
// NOTE: We only load first matching id resource chunk found but
// we show a message if additional chunks are detected
if (info.nextOffset != 0) RRES_LOG("RRES: WARNING: Multiple linked resource chunks available for the provided id");
/*
// Variables required to check multiple chunks
int chunkCount = 0;
long currentFileOffset = ftell(rresFile); // Store current file position
rresResourceChunkInfo temp = info; // Temp info header to scan resource chunks
// Count all linked resource chunks checking temp.nextOffset
while (temp.nextOffset != 0)
{
fseek(rresFile, temp.nextOffset, SEEK_SET); // Jump to next linked resource
fread(&temp, sizeof(rresResourceChunkInfo), 1, rresFile); // Read next resource info header
chunkCount++;
}
fseek(rresFile, currentFileOffset, SEEK_SET); // Return to first resource chunk position
*/
// Read and resource chunk from file data
// NOTE: Read data can be compressed/encrypted, it's up to the user library to manage decompression/decryption
void *data = RRES_MALLOC(info.packedSize); // Allocate enough memory to store resource data chunk
fread(data, info.packedSize, 1, rresFile); // Read data: propsCount + props[] + data (+additional_data)
// Get chunk.data properly organized (only if uncompressed/unencrypted)
chunk.data = rresLoadResourceChunkData(info, data);
chunk.info = info;
RRES_FREE(data);
break; // Resource id found and loaded, stop checking the file
}
else
{
// Skip required data size to read next resource info header
fseek(rresFile, info.packedSize, SEEK_CUR);
}
}
if (!found) RRES_LOG("RRES: WARNING: Requested resource not found: 0x%08x\n", rresId);
}
else RRES_LOG("RRES: WARNING: The provided file is not a valid rres file, file signature or version not valid\n");
fclose(rresFile);
}
return chunk;
}
// Unload resource chunk from memory
void rresUnloadResourceChunk(rresResourceChunk chunk)
{
RRES_FREE(chunk.data.props); // Resource chunk properties
RRES_FREE(chunk.data.raw); // Resource chunk raw data
}
// Load resource from file by id
// NOTE: All resources conected to base id are loaded
rresResourceMulti rresLoadResourceMulti(const char *fileName, unsigned int rresId)
{
rresResourceMulti rres = { 0 };
FILE *rresFile = fopen(fileName, "rb");
if (rresFile == NULL) RRES_LOG("RRES: WARNING: [%s] rres file could not be opened\n", fileName);
else
{
rresFileHeader header = { 0 };
// Read rres file header
fread(&header, sizeof(rresFileHeader), 1, rresFile);
// Verify file signature: "rres" and file version: 100
if (((header.id[0] == 'r') && (header.id[1] == 'r') && (header.id[2] == 'e') && (header.id[3] == 's')) && (header.version == 100))
{
bool found = false;
// Check all available chunks looking for the requested id
for (int i = 0; i < header.chunkCount; i++)
{
rresResourceChunkInfo info = { 0 };
// Read resource info header
fread(&info, sizeof(rresResourceChunkInfo), 1, rresFile);
// Check if resource id is the requested one
if (info.id == rresId)
{
found = true;
RRES_LOG("RRES: INFO: Found requested resource id: 0x%08x\n", info.id);
RRES_LOG("RRES: %c%c%c%c: Id: 0x%08x | Base size: %i | Packed size: %i\n", info.type[0], info.type[1], info.type[2], info.type[3], info.id, info.baseSize, info.packedSize);
rres.count = 1;
long currentFileOffset = ftell(rresFile); // Store current file position
rresResourceChunkInfo temp = info; // Temp info header to scan resource chunks
// Count all linked resource chunks checking temp.nextOffset
while (temp.nextOffset != 0)
{
fseek(rresFile, temp.nextOffset, SEEK_SET); // Jump to next linked resource
fread(&temp, sizeof(rresResourceChunkInfo), 1, rresFile); // Read next resource info header
rres.count++;
}
rres.chunks = (rresResourceChunk *)RRES_CALLOC(rres.count, sizeof(rresResourceChunk)); // Load as many rres slots as required
fseek(rresFile, currentFileOffset, SEEK_SET); // Return to first resource chunk position
// Read and load data chunk from file data
// NOTE: Read data can be compressed/encrypted,
// it's up to the user library to manage decompression/decryption
void *data = RRES_MALLOC(info.packedSize); // Allocate enough memory to store resource data chunk
fread(data, info.packedSize, 1, rresFile); // Read data: propsCount + props[] + data (+additional_data)
// Get chunk.data properly organized (only if uncompressed/unencrypted)
rres.chunks[0].data = rresLoadResourceChunkData(info, data);
rres.chunks[0].info = info;
RRES_FREE(data);
int i = 1;
// Load all linked resource chunks
while (info.nextOffset != 0)
{
fseek(rresFile, info.nextOffset, SEEK_SET); // Jump to next resource chunk
fread(&info, sizeof(rresResourceChunkInfo), 1, rresFile); // Read next resource info header
RRES_LOG("RRES: %c%c%c%c: Id: 0x%08x | Base size: %i | Packed size: %i\n", info.type[0], info.type[1], info.type[2], info.type[3], info.id, info.baseSize, info.packedSize);
void *data = RRES_MALLOC(info.packedSize); // Allocate enough memory to store resource data chunk
fread(data, info.packedSize, 1, rresFile); // Read data: propsCount + props[] + data (+additional_data)
// Get chunk.data properly organized (only if uncompressed/unencrypted)
rres.chunks[i].data = rresLoadResourceChunkData(info, data);
rres.chunks[i].info = info;
RRES_FREE(data);
i++;
}
break; // Resource id found and loaded, stop checking the file
}
else
{
// Skip required data size to read next resource info header
fseek(rresFile, info.packedSize, SEEK_CUR);
}
}
if (!found) RRES_LOG("RRES: WARNING: Requested resource not found: 0x%08x\n", rresId);
}
else RRES_LOG("RRES: WARNING: The provided file is not a valid rres file, file signature or version not valid\n");
fclose(rresFile);
}
return rres;
}
// Unload resource data
void rresUnloadResourceMulti(rresResourceMulti multi)
{
for (unsigned int i = 0; i < multi.count; i++) rresUnloadResourceChunk(multi.chunks[i]);
RRES_FREE(multi.chunks);
}
// Load resource chunk info for provided id
RRESAPI rresResourceChunkInfo rresLoadResourceChunkInfo(const char *fileName, unsigned int rresId)
{
rresResourceChunkInfo info = { 0 };
FILE *rresFile = fopen(fileName, "rb");
if (rresFile != NULL)
{
rresFileHeader header = { 0 };
fread(&header, sizeof(rresFileHeader), 1, rresFile);
// Verify file signature: "rres", file version: 100
if (((header.id[0] == 'r') && (header.id[1] == 'r') && (header.id[2] == 'e') && (header.id[3] == 's')) && (header.version == 100))
{
// Try to find provided resource chunk id and read info chunk
for (int i = 0; i < header.chunkCount; i++)
{
// Read resource chunk info
fread(&info, sizeof(rresResourceChunkInfo), 1, rresFile);
if (info.id == rresId)
{
// TODO: Jump to next resource chunk for provided id
//if (info.nextOffset > 0) fseek(rresFile, info.nextOffset, SEEK_SET);
break; // If requested rresId is found, we return the read rresResourceChunkInfo
}
else fseek(rresFile, info.packedSize, SEEK_CUR); // Jump to next resource
}
}
else RRES_LOG("RRES: WARNING: The provided file is not a valid rres file, file signature or version not valid\n");
fclose(rresFile);
}
return info;
}
// Load all resource chunks info
RRESAPI rresResourceChunkInfo *rresLoadResourceChunkInfoAll(const char *fileName, unsigned int *chunkCount)
{
rresResourceChunkInfo *infos = { 0 };
unsigned int count = 0;
FILE *rresFile = fopen(fileName, "rb");
if (rresFile != NULL)
{
rresFileHeader header = { 0 };
fread(&header, sizeof(rresFileHeader), 1, rresFile);
// Verify file signature: "rres", file version: 100
if (((header.id[0] == 'r') && (header.id[1] == 'r') && (header.id[2] == 'e') && (header.id[3] == 's')) && (header.version == 100))
{
// Load all resource chunks info
infos = (rresResourceChunkInfo *)RRES_CALLOC(header.chunkCount, sizeof(rresResourceChunkInfo));
count = header.chunkCount;
for (unsigned int i = 0; i < count; i++)
{
fread(&infos[i], sizeof(rresResourceChunkInfo), 1, rresFile); // Read resource chunk info
if (infos[i].nextOffset > 0) fseek(rresFile, infos[i].nextOffset, SEEK_SET); // Jump to next resource
else fseek(rresFile, infos[i].packedSize, SEEK_CUR); // Jump to next resource
}
}
else RRES_LOG("RRES: WARNING: The provided file is not a valid rres file, file signature or version not valid\n");
fclose(rresFile);
}
*chunkCount = count;
return infos;
}
// Load central directory data
rresCentralDir rresLoadCentralDirectory(const char *fileName)
{
rresCentralDir dir = { 0 };
FILE *rresFile = fopen(fileName, "rb");
if (rresFile != NULL)
{
rresFileHeader header = { 0 };
fread(&header, sizeof(rresFileHeader), 1, rresFile);
// Verify file signature: "rres", file version: 100
if (((header.id[0] == 'r') && (header.id[1] == 'r') && (header.id[2] == 'e') && (header.id[3] == 's')) && (header.version == 100))
{
// Check if there is a Central Directory available
if (header.cdOffset == 0) RRES_LOG("RRES: WARNING: CDIR: No central directory found\n");
else
{
rresResourceChunkInfo info = { 0 };
fseek(rresFile, header.cdOffset, SEEK_CUR); // Move to central directory position
fread(&info, sizeof(rresResourceChunkInfo), 1, rresFile); // Read resource info
// Verify resource type is CDIR
if ((info.type[0] == 'C') && (info.type[1] == 'D') && (info.type[2] == 'I') && (info.type[3] == 'R'))
{
RRES_LOG("RRES: CDIR: Central Directory found at offset: 0x%08x\n", header.cdOffset);
void *data = RRES_MALLOC(info.packedSize);
fread(data, info.packedSize, 1, rresFile);
// Load resource chunk data (central directory), data is uncompressed/unencrypted by default
rresResourceChunkData chunkData = rresLoadResourceChunkData(info, data);
RRES_FREE(data);
dir.count = chunkData.props[0]; // File entries count
RRES_LOG("RRES: CDIR: Central Directory file entries count: %i\n", dir.count);
unsigned char *ptr = chunkData.raw;
dir.entries = (rresDirEntry *)RRES_CALLOC(dir.count, sizeof(rresDirEntry));
for (unsigned int i = 0; i < dir.count; i++)
{
dir.entries[i].id = ((int *)ptr)[0]; // Resource id
dir.entries[i].offset = ((int *)ptr)[1]; // Resource offset in file
// NOTE: There is a reserved integer value before fileNameSize
dir.entries[i].fileNameSize = ((int *)ptr)[3]; // Resource fileName size
// Resource fileName, NULL terminated and 0-padded to 4-byte,
// fileNameSize considers NULL and padding
memcpy(dir.entries[i].fileName, ptr + 16, dir.entries[i].fileNameSize);
ptr += (16 + dir.entries[i].fileNameSize); // Move pointer for next entry
}
RRES_FREE(chunkData.props);
RRES_FREE(chunkData.raw);
}
}
}
else RRES_LOG("RRES: WARNING: The provided file is not a valid rres file, file signature or version not valid\n");
fclose(rresFile);
}
return dir;
}
// Unload central directory data
void rresUnloadCentralDirectory(rresCentralDir dir)
{
RRES_FREE(dir.entries);
}
// Get rresResourceDataType from FourCC code
// NOTE: Function expects to receive a char[4] array
unsigned int rresGetDataType(const unsigned char *fourCC)
{
unsigned int type = 0;
if (fourCC != NULL)
{
if (memcmp(fourCC, "NULL", 4) == 0) type = RRES_DATA_NULL; // Reserved for empty chunks, no props/data
else if (memcmp(fourCC, "RAWD", 4) == 0) type = RRES_DATA_RAW; // Raw file data, input file is not processed, just packed as is
else if (memcmp(fourCC, "TEXT", 4) == 0) type = RRES_DATA_TEXT; // Text file data, byte data extracted from text file
else if (memcmp(fourCC, "IMGE", 4) == 0) type = RRES_DATA_IMAGE; // Image file data, pixel data extracted from image file
else if (memcmp(fourCC, "WAVE", 4) == 0) type = RRES_DATA_WAVE; // Audio file data, samples data extracted from audio file
else if (memcmp(fourCC, "VRTX", 4) == 0) type = RRES_DATA_VERTEX; // Vertex file data, extracted from a mesh file
else if (memcmp(fourCC, "FNTG", 4) == 0) type = RRES_DATA_FONT_GLYPHS; // Font glyphs info, generated from an input font file
else if (memcmp(fourCC, "LINK", 4) == 0) type = RRES_DATA_LINK; // External linked file, filepath as provided on file input
else if (memcmp(fourCC, "CDIR", 4) == 0) type = RRES_DATA_DIRECTORY; // Central directory for input files relation to resource chunks
}
/*
// Assign type (unsigned int) FourCC (char[4])
if ((fourCC[0] == 'N') && (fourCC[1] == 'U') && (fourCC[2] == 'L') && (fourCC[3] == 'L')) type = RRES_DATA_NULL; // NULL
if ((fourCC[0] == 'R') && (fourCC[1] == 'A') && (fourCC[2] == 'W') && (fourCC[3] == 'D')) type = RRES_DATA_RAW; // RAWD
else if ((fourCC[0] == 'T') && (fourCC[1] == 'E') && (fourCC[2] == 'X') && (fourCC[3] == 'T')) type = RRES_DATA_TEXT; // TEXT
else if ((fourCC[0] == 'I') && (fourCC[1] == 'M') && (fourCC[2] == 'G') && (fourCC[3] == 'E')) type = RRES_DATA_IMAGE; // IMGE
else if ((fourCC[0] == 'W') && (fourCC[1] == 'A') && (fourCC[2] == 'V') && (fourCC[3] == 'E')) type = RRES_DATA_WAVE; // WAVE
else if ((fourCC[0] == 'V') && (fourCC[1] == 'R') && (fourCC[2] == 'T') && (fourCC[3] == 'X')) type = RRES_DATA_VERTEX; // VRTX
else if ((fourCC[0] == 'F') && (fourCC[1] == 'N') && (fourCC[2] == 'T') && (fourCC[3] == 'G')) type = RRES_DATA_FONT_GLYPHS; // FNTG
else if ((fourCC[0] == 'L') && (fourCC[1] == 'I') && (fourCC[2] == 'N') && (fourCC[3] == 'K')) type = RRES_DATA_LINK; // LINK
else if ((fourCC[0] == 'C') && (fourCC[1] == 'D') && (fourCC[2] == 'I') && (fourCC[3] == 'R')) type = RRES_DATA_DIRECTORY; // CDIR
*/
return type;
}
// Get resource identifier from filename
// WARNING: It requires the central directory previously loaded
unsigned int rresGetResourceId(rresCentralDir dir, const char *fileName)
{
unsigned int id = 0;
for (unsigned int i = 0, len = 0; i < dir.count; i++)
{
len = (unsigned int)strlen(fileName);
// NOTE: entries[i].fileName is NULL terminated and padded to 4-bytes
if (strncmp((const char *)dir.entries[i].fileName, fileName, len) == 0)
{
id = dir.entries[i].id;
break;
}
}
return id;
}
// Compute CRC32 hash
// NOTE: CRC32 is used as rres id, generated from original filename
unsigned int rresComputeCRC32(unsigned char *data, int len)
{
static unsigned int crcTable[256] = {
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};
unsigned int crc = ~0u;
for (int i = 0; i < len; i++) crc = (crc >> 8)^crcTable[data[i]^(crc&0xff)];
return ~crc;
}
// Set password to be used on data decryption
void rresSetCipherPassword(const char *pass)
{
password = pass;
}
// Get password to be used on data decryption
const char *rresGetCipherPassword(void)
{
if (password == NULL) password = "password12345";
return password;
}
//----------------------------------------------------------------------------------
// Module Internal Functions Definition
//----------------------------------------------------------------------------------
// Load user resource chunk from resource packed data (as contained in .rres file)
// WARNING: Data can be compressed and/or encrypted, in those cases is up to the user to process it,
// and chunk.data.propCount = 0, chunk.data.props = NULL and chunk.data.raw contains all resource packed data
static rresResourceChunkData rresLoadResourceChunkData(rresResourceChunkInfo info, void *data)
{
rresResourceChunkData chunkData = { 0 };
// CRC32 data validation, verify packed data is not corrupted
unsigned int crc32 = rresComputeCRC32(data, info.packedSize);
if ((rresGetDataType(info.type) != RRES_DATA_NULL) && (crc32 == info.crc32)) // Make sure chunk contains data and data is not corrupted
{
// Check if data chunk is compressed/encrypted to retrieve properties + data
if ((info.compType == RRES_COMP_NONE) && (info.cipherType == RRES_CIPHER_NONE))
{
// Data is not compressed/encrypted (info.packedSize = info.baseSize)
chunkData.propCount = ((unsigned int *)data)[0];
if (chunkData.propCount > 0)
{
chunkData.props = (unsigned int *)RRES_CALLOC(chunkData.propCount, sizeof(unsigned int));
for (unsigned int i = 0; i < chunkData.propCount; i++) chunkData.props[i] = ((unsigned int *)data)[i + 1];
}
int rawSize = info.baseSize - sizeof(int) - (chunkData.propCount*sizeof(int));
chunkData.raw = RRES_MALLOC(rawSize);
memcpy(chunkData.raw, ((unsigned char *)data) + sizeof(int) + (chunkData.propCount*sizeof(int)), rawSize);
}
else
{
// Data is compressed/encrypted
// We just return the loaded resource packed data from .rres file,
// it's up to the user to manage decompression/decryption on user library
chunkData.raw = RRES_MALLOC(info.packedSize);
memcpy(chunkData.raw, (unsigned char *)data, info.packedSize);
}
}
if (crc32 != info.crc32) RRES_LOG("RRES: WARNING: [ID %i] CRC32 does not match, data can be corrupted\n", info.id);
return chunkData;
}
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