/* ScummVM - Graphic Adventure Engine * * ScummVM is the legal property of its developers, whose names * are too numerous to list here. Please refer to the COPYRIGHT * file distributed with this source distribution. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * $URL$ * $Id$ * */ #ifndef SCI_SCICORE_RESOURCE_H #define SCI_SCICORE_RESOURCE_H #include "common/str.h" namespace Common { class ReadStream; } namespace Sci { /** The maximum allowed size for a compressed or decompressed resource */ #define SCI_MAX_RESOURCE_SIZE 0x0400000 /*** RESOURCE STATUS TYPES ***/ #define SCI_STATUS_NOMALLOC 0 #define SCI_STATUS_ALLOCATED 1 #define SCI_STATUS_ENQUEUED 2 /* In the LRU queue */ #define SCI_STATUS_LOCKED 3 /* Allocated and in use */ #define SCI_RES_FILE_NR_PATCH -1 /* Resource was read from a patch file rather than from a resource */ /*** INITIALIZATION RESULT TYPES ***/ #define SCI_ERROR_IO_ERROR 1 #define SCI_ERROR_EMPTY_OBJECT 2 #define SCI_ERROR_INVALID_RESMAP_ENTRY 3 /* Invalid resource.map entry */ #define SCI_ERROR_RESMAP_NOT_FOUND 4 #define SCI_ERROR_NO_RESOURCE_FILES_FOUND 5 /* No resource at all was found */ #define SCI_ERROR_UNKNOWN_COMPRESSION 6 #define SCI_ERROR_DECOMPRESSION_OVERFLOW 7 /* decompression failed: Buffer overflow (wrong SCI version?) */ #define SCI_ERROR_DECOMPRESSION_INSANE 8 /* sanity checks failed during decompression */ #define SCI_ERROR_RESOURCE_TOO_BIG 9 /* Resource size exceeds SCI_MAX_RESOURCE_SIZE */ #define SCI_ERROR_UNSUPPORTED_VERSION 10 #define SCI_ERROR_INVALID_SCRIPT_VERSION 11 #define SCI_ERROR_CRITICAL SCI_ERROR_NO_RESOURCE_FILES_FOUND /* the first critical error number */ /*** SCI VERSION NUMBERS ***/ #define SCI_VERSION_AUTODETECT 0 #define SCI_VERSION_0 1 #define SCI_VERSION_01 2 #define SCI_VERSION_01_VGA 3 #define SCI_VERSION_01_VGA_ODD 4 #define SCI_VERSION_1_EARLY 5 #define SCI_VERSION_1_LATE 6 #define SCI_VERSION_1_1 7 #define SCI_VERSION_32 8 #define SCI_VERSION_LAST SCI_VERSION_1_LATE /* The last supported SCI version */ #define SCI_VERSION_1 SCI_VERSION_1_EARLY enum ResourceType { RESSOURCE_TYPE_DIRECTORY = 0, RESSOURCE_TYPE_VOLUME = 2, RESSOURCE_TYPE_EXTERNAL_MAP = 3, RESSOURCE_TYPE_INTERNAL_MAP = 4, RESSOURCE_TYPE_MASK = 127 }; #define RESSOURCE_ADDRESSING_BASIC 0 #define RESSOURCE_ADDRESSING_EXTENDED 128 #define RESSOURCE_ADDRESSING_MASK 128 extern const char *sci_error_types[]; extern const char *sci_version_types[]; extern const char *sci_resource_types[]; extern const char *sci_resource_type_suffixes[]; /* Suffixes for SCI1 patch files */ extern const int sci_max_resource_nr[]; /* Highest possible resource numbers */ enum ResourceTypes { sci_view = 0, sci_pic, sci_script, sci_text, sci_sound, sci_memory, sci_vocab, sci_font, sci_cursor, sci_patch, sci_bitmap, sci_palette, sci_cdaudio, sci_audio, sci_sync, sci_message, sci_map, sci_heap, sci_invalid_resource }; #define sci0_last_resource sci_patch #define sci1_last_resource sci_heap /* Used for autodetection */ struct resource_index_struct { unsigned short resource_id; unsigned int resource_location; }; /* resource type as stored in the resource.map file */ typedef struct resource_index_struct resource_index_t; struct ResourceSource { ResourceType source_type; bool scanned; Common::String location_name; // FIXME: Replace by FSNode ? Common::String location_dir_name; // FIXME: Get rid of this again, only a temporary HACK! int volume_number; ResourceSource *associated_map; ResourceSource *next; }; struct resource_altsource_t { ResourceSource *source; unsigned int file_offset; resource_altsource_t *next; }; /** Struct for storing resources in memory */ struct resource_t { unsigned char *data; unsigned short number; unsigned short type; uint16 id; /* contains number and type */ unsigned int size; unsigned int file_offset; /* Offset in file */ ResourceSource *source; unsigned char status; unsigned short lockers; /* Number of places where this resource was locked */ resource_t *next; /* Position marker for the LRU queue */ resource_t *prev; resource_altsource_t *alt_sources; /* SLL of alternative resource data sources */ }; struct ResourceManager { int _maxMemory; /* Config option: Maximum total byte number allocated */ int sci_version; /* SCI resource version to use */ int _resourcesNr; ResourceSource *_sources; resource_t *_resources; int memory_locked; /* Amount of resource bytes in locked memory */ int memory_lru; /* Amount of resource bytes under LRU control */ resource_t *lru_first, *lru_last; /* Pointers to the first and last LRU queue entries */ /* LRU queue: lru_first points to the most recent entry */ public: /** * Creates a new FreeSCI resource manager. * @param version The SCI version to look for; use SCI_VERSION_AUTODETECT * in the default case. * @param maxMemory Maximum number of bytes to allow allocated for resources * * @note maxMemory will not be interpreted as a hard limit, only as a restriction * for resources which are not explicitly locked. However, a warning will be * issued whenever this limit is exceeded. */ ResourceManager(int version, int maxMemory); ~ResourceManager(); }; /**** FUNCTION DECLARATIONS ****/ /**--- New Resource manager ---**/ ResourceSource *scir_add_patch_dir(ResourceManager *mgr, const char *path); /* Add a path to the resource manager's list of sources. ** Parameters: (ResourceManager *) mgr: The resource manager to look up in ** (const char *) path: The path to add ** Returns: A pointer to the added source structure, or NULL if an error occurred. */ ResourceSource *scir_get_volume(ResourceManager *mgr, ResourceSource *map, int volume_nr); ResourceSource *scir_add_volume(ResourceManager *mgr, ResourceSource *map, const char *filename, int number, int extended_addressing); /* Add a volume to the resource manager's list of sources. ** Parameters: (ResourceManager *) mgr: The resource manager to look up in ** (ResourceSource *) map: The map associated with this volume ** (char *) filename: The name of the volume to add ** (int) extended_addressing: 1 if this volume uses extended addressing, ** 0 otherwise. ** Returns: A pointer to the added source structure, or NULL if an error occurred. */ ResourceSource *scir_add_external_map(ResourceManager *mgr, const char *file_name); /* Add an external (i.e. separate file) map resource to the resource manager's list of sources. ** Parameters: (ResourceManager *) mgr: The resource manager to look up in ** (const char *) file_name: The name of the volume to add ** Returns: A pointer to the added source structure, or NULL if an error occurred. */ int scir_scan_new_sources(ResourceManager *mgr, int *detected_version); /* Scans newly registered resource sources for resources, earliest addition first. ** Parameters: (ResourceManager *) mgr: The resource manager to look up in ** (int *) detected_version: Pointer to the detected version number, ** used during startup. May be NULL. ** Returns: One of SCI_ERROR_*. */ resource_t *scir_find_resource(ResourceManager *mgr, int type, int number, int lock); /* Looks up a resource's data ** Parameters: (ResourceManager *) mgr: The resource manager to look up in ** (int) type: The resource type to look for ** (int) number: The resource number to search ** (int) lock: non-zero iff the resource should be locked ** Returns : (resource_t *): The resource, or NULL if it doesn't exist ** Locked resources are guaranteed not to have their contents freed until ** they are unlocked explicitly (by scir_unlock_resource). */ void scir_unlock_resource(ResourceManager *mgr, resource_t *res, int restype, int resnum); /* Unlocks a previously locked resource ** Parameters: (ResourceManager *) mgr: The manager the resource should be freed from ** (resource_t *) res: The resource to free ** (int) type: Type of the resource to check (for error checking) ** (int) number: Number of the resource to check (ditto) ** Returns : (void) */ resource_t *scir_test_resource(ResourceManager *mgr, int type, int number); /* Tests whether a resource exists ** Parameters: (ResourceManager *) mgr: The resource manager to search in ** (int) type: Type of the resource to check ** (int) number: Number of the resource to check ** Returns : (resource_t *) non-NULL if the resource exists, NULL otherwise ** This function may often be much faster than finding the resource ** and should be preferred for simple tests. ** The resource object returned is, indeed, the resource in question, but ** it should be used with care, as it may be unallocated. ** Use scir_find_resource() if you want to use the data contained in the resource. */ /**--- Resource map decoding functions ---*/ int sci0_read_resource_map(ResourceManager *mgr, ResourceSource *map, resource_t **resources, int *resource_nr_p, int *sci_version); /* Reads the SCI0 resource.map file from a local directory ** Parameters: (char *) path: (unused) ** (resource_t **) resources: Pointer to a pointer ** that will be set to the ** location of the resources ** (in one large chunk) ** (int *) resource_nr_p: Pointer to an int the number of resources ** read is stored in ** (int) sci_version: SCI resource version ** Returns : (int) 0 on success, an SCI_ERROR_* code otherwise */ int sci1_read_resource_map(ResourceManager *mgr, ResourceSource *map, ResourceSource *vol, resource_t **resource_p, int *resource_nr_p, int *sci_version); /* Reads the SCI1 resource.map file from a local directory ** Parameters: (char *) path: (unused) ** (resource_t **) resources: Pointer to a pointer ** that will be set to the ** location of the resources ** (in one large chunk) ** (int *) resource_nr_p: Pointer to an int the number of resources ** read is stored in ** (int) sci_version: SCI resource version ** Returns : (int) 0 on success, an SCI_ERROR_* code otherwise */ /**--- Patch management functions ---*/ void sci0_sprintf_patch_file_name(char *string, resource_t *res); /* Prints the name of a matching patch to a string buffer ** Parameters: (char *) string: The buffer to print to ** (resource_t *) res: Resource containing the number and type of the ** resource whose name is to be print ** Returns : (void) */ void sci1_sprintf_patch_file_name(char *string, resource_t *res); /* Prints the name of a matching patch to a string buffer ** Parameters: (char *) string: The buffer to print to ** (resource_t *) res: Resource containing the number and type of the ** resource whose name is to be print ** Returns : (void) */ int sci0_read_resource_patches(ResourceSource *source, resource_t **resources, int *resource_nr_p); /* Reads SCI0 patch files from a local directory ** Parameters: (char *) path: (unused) ** (resource_t **) resources: Pointer to a pointer ** that will be set to the ** location of the resources ** (in one large chunk) ** (int *) resource_nr_p: Pointer to an int the number of resources ** read is stored in ** Returns : (int) 0 on success, an SCI_ERROR_* code otherwise */ int sci1_read_resource_patches(ResourceSource *source, resource_t **resources, int *resource_nr_p); /* Reads SCI1 patch files from a local directory ** Parameters: (char *) path: (unused) ** (resource_t **) resources: Pointer to a pointer ** that will be set to the ** location of the resources ** (in one large chunk) ** (int *) resource_nr_p: Pointer to an int the number of resources ** read is stored in ** Returns : (int) 0 on success, an SCI_ERROR_* code otherwise */ /**--- Decompression functions ---**/ int decompress0(resource_t *result, Common::ReadStream &stream, int sci_version); /* Decrypts resource data and stores the result for SCI0-style compression. ** Parameters : result: The resource_t the decompressed data is stored in. ** stream: Stream of the resource file ** sci_version : Actual SCI resource version ** Returns : (int) 0 on success, one of SCI_ERROR_* if a problem was ** encountered. */ int decompress01(resource_t *result, Common::ReadStream &stream, int sci_version); /* Decrypts resource data and stores the result for SCI01-style compression. ** Parameters : result: The resource_t the decompressed data is stored in. ** stream: Stream of the resource file ** sci_version : Actual SCI resource version ** Returns : (int) 0 on success, one of SCI_ERROR_* if a problem was ** encountered. */ int decompress1(resource_t *result, Common::ReadStream &stream, int sci_version); /* Decrypts resource data and stores the result for SCI1.1-style compression. ** Parameters : result: The resource_t the decompressed data is stored in. ** sci_version : Actual SCI resource version ** stream: Stream of the resource file ** Returns : (int) 0 on success, one of SCI_ERROR_* if a problem was ** encountered. */ int decompress11(resource_t *result, Common::ReadStream &stream, int sci_version); /* Decrypts resource data and stores the result for SCI1.1-style compression. ** Parameters : result: The resource_t the decompressed data is stored in. ** sci_version : Actual SCI resource version ** stream: Stream of the resource file ** Returns : (int) 0 on success, one of SCI_ERROR_* if a problem was ** encountered. */ int decrypt2(uint8* dest, uint8* src, int length, int complength); /* Huffman token decryptor - defined in decompress0.c and used in decompress01.c */ int decrypt4(uint8* dest, uint8* src, int length, int complength); /* DCL inflate- implemented in decompress1.c */ byte *view_reorder(byte *inbuffer, int dsize); /* SCI1 style view compression */ byte *pic_reorder(byte *inbuffer, int dsize); /* SCI1 style pic compression */ /*--- Internal helper functions ---*/ void _scir_free_resources(resource_t *resources, int _resourcesNr); /* Frees a block of resources and associated data ** Parameters: (resource_t *) resources: The resources to free ** (int) _resourcesNr: Number of resources in the block ** Returns : (void) */ resource_t *_scir_find_resource_unsorted(resource_t *res, int res_nr, int type, int number); /* Finds a resource matching type.number in an unsorted resource_t block ** To be used during initial resource loading, when the resource list ** may not have been sorted yet. ** Parameters: (resource_t *) res: Pointer to the block to search in ** (int) res_nr: Number of resource_t structs allocated and defined ** in the block pointed to by res ** (int) type: Type of the resource to look for ** (int) number: Number of the resource to look for ** Returns : (resource_t) The matching resource entry, or NULL if not found */ void _scir_add_altsource(resource_t *res, ResourceSource *source, unsigned int file_offset); /* Adds an alternative source to a resource ** Parameters: (resource_t *) res: The resource to add to ** (ResourceSource *) source: The source of the resource ** (unsigned int) file_offset: Offset in the file the resource ** is stored at ** Returns : (void) */ } // End of namespace Sci #endif // SCI_SCICORE_RESOURCE_H