/*
    chunks.c - Copyright (c) 2012 Fatbag <X-Fi6@phppoll.org>

    Permission to use, copy, modify, and/or distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "iff.h"

/* All chunk-parsing functions */
static int iff_parse_rsmp(IFFChunk * ChunkInfo, const uint8_t * Buffer, unsigned IFFSize);
static int iff_parse_bcon(IFFChunk * ChunkInfo, const uint8_t * Buffer);
static int iff_parse_str(IFFChunk * ChunkInfo, const uint8_t * Buffer);
static int iff_parse_trcn(IFFChunk * ChunkInfo, const uint8_t * Buffer);

int iff_parse_chunk(IFFChunk * ChunkInfo, const uint8_t * Buffer){
    unsigned i;
    const char chunktypes[] =
        "STR#" "CTSS" "FAMs" "TTAs"
        "BCON"
        "TRCN"
    ;
    int (* const iff_parse_function[])(IFFChunk*, const uint8_t*) = {
        iff_parse_str, iff_parse_str, iff_parse_str, iff_parse_str,
        iff_parse_bcon,
        iff_parse_trcn
    };
    
    for(i=0; chunktypes[i*4] != '\0'; i++){
        if(!memcmp(ChunkInfo->Type, chunktypes+i*4, 4))
            return iff_parse_function[i](ChunkInfo, Buffer);
    }
    return 0;
}

static int iff_parse_rsmp(IFFChunk * ChunkInfo, const uint8_t * Buffer, unsigned IFFSize){
    return 1;
}

static int iff_parse_bcon(IFFChunk * ChunkInfo, const uint8_t * Buffer){
    IFF_BCON *BCONData;
    unsigned Size = ChunkInfo->Size - 76;
    unsigned i;

    if(Size < 2)
        return 0;
    ChunkInfo->FormattedData = malloc(sizeof(IFF_BCON));
    if(ChunkInfo->FormattedData == NULL)
        return 0;

    BCONData = (IFF_BCON*) ChunkInfo->FormattedData;
    BCONData->ConstantCount = read_uint8le(Buffer);
    BCONData->Flags = read_uint8le(Buffer + 1);
    if(BCONData->ConstantCount == 0)
        return 1;
    if(BCONData->ConstantCount * 2 > Size - 2){
        free(BCONData);
        return 0;
    }
    
    BCONData->Constants = malloc(BCONData->ConstantCount * sizeof(uint16_t));
    if(BCONData->Constants == NULL){
        free(BCONData);
        return 0;
    }

    Buffer += 2;
    for(i=0; i<BCONData->ConstantCount; i++, Buffer += 2)
        BCONData->Constants[i] = read_uint16le(Buffer);
 	return 1;
}

static int iff_parse_str(IFFChunk * ChunkInfo, const uint8_t * Buffer){
    /* No bounds checking yet */
    IFF_STR * StringData;
    unsigned Size = ChunkInfo->Size - 76;

    if(Size < 2)
        return 0;
    ChunkInfo->FormattedData = malloc(sizeof(IFF_STR));
    if(ChunkInfo->FormattedData == NULL)
        return 0;
    
    StringData = (IFF_STR*) ChunkInfo->FormattedData;
    memset(StringData, 0, sizeof(IFF_STR));
    StringData->Format = read_int16le(Buffer);
    Buffer += 2;
    if(Size-2 < 2) /* TSO allows this; as seen in the animations chunk in personglobals.iff */
        return 1;
    
    switch(StringData->Format){
    
    case 0: {
        unsigned i;
        IFFStringPairNode * PrevPair = NULL;
        
        StringData->LanguageSets[0].PairCount = read_uint16le(Buffer);
        Buffer += 2;
        if(StringData->LanguageSets[0].PairCount == 0)
            return 1;
        
        for(i=0; i<StringData->LanguageSets[0].PairCount; i++){
            IFFStringPairNode * CurrentPair;
            unsigned length;
            CurrentPair = malloc(sizeof(IFFStringPairNode));
            memset(CurrentPair, 0, sizeof(IFFStringPairNode));
            
            if(i == 0) StringData->LanguageSets[0].FirstPair = CurrentPair;
            else       PrevPair->NextPair = CurrentPair;
            CurrentPair->PrevPair = PrevPair;

            /* Key */
            length = read_uint8le(Buffer);
            if(length != 0){
                CurrentPair->Pair.Key = malloc(length+1);
                memcpy(CurrentPair->Pair.Key, Buffer+1, length);
                CurrentPair->Pair.Key[length] = 0x00;
            }
            Buffer += length+1;
            
            PrevPair = CurrentPair;
        }
        StringData->LanguageSets[0].LastPair = PrevPair;
    } return 1;

    case -1: {
        unsigned i;
        IFFStringPairNode * PrevPair = NULL;
        
        StringData->LanguageSets[0].PairCount = read_uint16le(Buffer);
        Buffer += 2;
        if(StringData->LanguageSets[0].PairCount == 0)
            return 1;
        
        for(i=0; i<StringData->LanguageSets[0].PairCount; i++){
            IFFStringPairNode * CurrentPair;
            unsigned length;
            CurrentPair = malloc(sizeof(IFFStringPairNode));
            memset(CurrentPair, 0, sizeof(IFFStringPairNode));
            
            if(i == 0) StringData->LanguageSets[0].FirstPair = CurrentPair;
            else       PrevPair->NextPair = CurrentPair;
            CurrentPair->PrevPair = PrevPair;

            /* Key */
            length = strlen((char*)Buffer);
            if(length != 0){
                CurrentPair->Pair.Key = malloc(length+1);
                strcpy(CurrentPair->Pair.Key, (char*)Buffer);
            }
            Buffer += length+1;
            
            PrevPair = CurrentPair;
        }
        StringData->LanguageSets[0].LastPair = PrevPair;
    } return 1;

    case -2: {
        unsigned i;
        IFFStringPairNode * PrevPair = NULL;
        
        StringData->LanguageSets[0].PairCount = read_uint16le(Buffer);
        Buffer += 2;
        if(StringData->LanguageSets[0].PairCount == 0)
            return 1;
        
        for(i=0; i<StringData->LanguageSets[0].PairCount; i++){
            IFFStringPairNode * CurrentPair;
            unsigned length;
            CurrentPair = malloc(sizeof(IFFStringPairNode));
            memset(CurrentPair, 0, sizeof(IFFStringPairNode));
            
            if(i == 0) StringData->LanguageSets[0].FirstPair = CurrentPair;
            else       PrevPair->NextPair = CurrentPair;
            CurrentPair->PrevPair = PrevPair;

            /* Key */
            length = strlen((char*)Buffer);
            if(length != 0){
                CurrentPair->Pair.Key = malloc(length+1);
                strcpy(CurrentPair->Pair.Key, (char*)Buffer);
            }
            Buffer += length+1;

            /* Value */
            length = strlen((char*)Buffer);
            if(length != 0){
                CurrentPair->Pair.Value = malloc(length+1);
                strcpy(CurrentPair->Pair.Value, (char*)Buffer);
            }
            Buffer += length+1;
            
            PrevPair = CurrentPair;
        }
        StringData->LanguageSets[0].LastPair = PrevPair;
    } return 1;

    case -3: {
        unsigned i, TotalPairCount;
        
        TotalPairCount = read_uint16le(Buffer);
        Buffer += 2;
        if(TotalPairCount == 0)
            return 1;

        for(i=0; i<TotalPairCount; i++){
            IFFStringPairNode * Pair;
            unsigned length;
            Pair = malloc(sizeof(IFFStringPairNode));
            memset(Pair, 0, sizeof(IFFStringPairNode));
            Pair->Pair.LanguageSet = read_uint8le(Buffer) - 1;
            Buffer++;
            
            /* Key */
            length = strlen((char*)Buffer);
            if(length != 0){
                Pair->Pair.Key = malloc(length+1);
                strcpy(Pair->Pair.Key, (char*)Buffer);
            }
            Buffer += length+1;

            /* Value */
            length = strlen((char*)Buffer);
            if(length != 0){
                Pair->Pair.Value = malloc(length+1);
                strcpy(Pair->Pair.Value, (char*)Buffer);
            }
            Buffer += length+1;
            
            /* Add the pair to the end of the associated language set */
            Pair->PrevPair = StringData->LanguageSets[0].LastPair;
            if(StringData->LanguageSets[0].PairCount == 0)
                StringData->LanguageSets[0].FirstPair = Pair;
            else
                StringData->LanguageSets[0].LastPair->NextPair = Pair;
            StringData->LanguageSets[0].PairCount++;
            StringData->LanguageSets[0].LastPair = Pair;
        }
    } return 1;

    case -4: {
        unsigned LanguageSet;
        unsigned LanguageSetCount = read_uint8le(Buffer);
        Buffer++;
        if(LanguageSetCount > 20) LanguageSetCount = 20;
        
        for(LanguageSet=0; LanguageSet<LanguageSetCount; LanguageSet++){
            unsigned i;
            IFFStringPairNode * PrevPair = NULL;
            
            StringData->LanguageSets[LanguageSet].PairCount = read_uint16le(Buffer);
            Buffer += 2;
            if(StringData->LanguageSets[LanguageSet].PairCount == 0)
                continue;
            
            for(i=0; i<StringData->LanguageSets[LanguageSet].PairCount; i++){
                IFFStringPairNode * CurrentPair;
                unsigned length;
                CurrentPair = malloc(sizeof(IFFStringPairNode));
                memset(CurrentPair, 0, sizeof(IFFStringPairNode));
                
                if(i == 0) StringData->LanguageSets[LanguageSet].FirstPair = CurrentPair;
                else       PrevPair->NextPair = CurrentPair;
                CurrentPair->PrevPair = PrevPair;
                
                Buffer++; /* Skip over LanguageSet */

                /* Key */
                length = read_uint8le(Buffer);
                if(length > 127){
                    length = (length & 127) | (read_uint8le(Buffer+1) << 7);
                    Buffer++;
                }
                if(length != 0){
                    CurrentPair->Pair.Key = malloc(length+1);
                    memcpy(CurrentPair->Pair.Key, Buffer+1, length);
                    CurrentPair->Pair.Key[length] = 0x00;
                }
                Buffer += length + 1;

                /* Value */
                length = read_uint8le(Buffer);
                if(length > 127){
                    length = (length & 127) | (read_uint8le(Buffer+1) << 7);
                    Buffer++;
                }
                if(length != 0){
                    CurrentPair->Pair.Value = malloc(length+1);
                    memcpy(CurrentPair->Pair.Value, Buffer+1, length);
                    CurrentPair->Pair.Value[length] = 0x00;
                }
                Buffer += length + 1;
                
                PrevPair = CurrentPair;
            }
            StringData->LanguageSets[LanguageSet].LastPair = PrevPair;
        }
    } return 1;
    
    }

    free(ChunkInfo->FormattedData);
    return 0;
}

static int iff_parse_trcn(IFFChunk * ChunkInfo, const uint8_t * Buffer){
    IFF_TRCN * TRCNData;
    unsigned Size = ChunkInfo->Size - 76;
    unsigned i;
    
    if(Size < 16)
        return 0;
    ChunkInfo->FormattedData = malloc(sizeof(IFF_TRCN));
    if(ChunkInfo->FormattedData == NULL)
        return 0;
    
    TRCNData = (IFF_TRCN*) ChunkInfo->FormattedData;
    TRCNData->Reserved = read_uint32le(Buffer+0);
    TRCNData->Version = read_uint32le(Buffer+4);
    memcpy(TRCNData->MagicNumber, Buffer+8, 4);
    TRCNData->MagicNumber[4] = 0x00;
    TRCNData->EntryCount = read_uint32le(Buffer+12);
    
    if(TRCNData->Reserved != 0 || TRCNData->Version > 2 || strcmp(TRCNData->MagicNumber, "NCRT")){
        free(TRCNData);
        return 0;
    }
    ChunkInfo->FormattedData = malloc(TRCNData->EntryCount * sizeof(IFFRangePair));
    if(ChunkInfo->FormattedData == NULL){
        free(TRCNData);
        return 0;
    }
    
    Buffer += 16;
    for(i=0; i<TRCNData->EntryCount; i++){/*
        IsUnused = read_uint32le(Buffer+0);
        Unknown = read_uint32le(Buffer+4);*/
    }
}