/* ************************************************************************
 * Copyright 2013 Advanced Micro Devices, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ************************************************************************/


#include <string.h>
#include <assert.h>

#include "fileio.h"

#ifdef _WIN32
const char dirDelimiter = '\\';
#else
const char dirDelimiter = '/';
#endif

//TODO
typedef unsigned int      uint32_t;
typedef uint32_t  uint_least32_t;
/*
  Name  : CRC-32
  Poly  : 0x04C11DB7    x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11
                       + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1
  Init  : 0xFFFFFFFF
  Revert: true
  XorOut: 0xFFFFFFFF
  Check : 0xCBF43926 ("123456789")
  MaxLen: 268 435 455 ���� (2 147 483 647 ���)
*/
const uint_least32_t Crc32Table[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
};

void
hfInit(HfInfo* hf) {
	hf->file = NULL;
	hf->hash = 0;
}
char *
hfCreateFullPatch( const char* path, const char * name, const char * ext )
{
    char * fname;
    size_t pathSize;
    size_t nameSize;
    size_t extSize;

    pathSize = strlen(path);
    nameSize = strlen(name);
    extSize  = strlen(ext);

    // Add three characters, terminating zero, slash and dot
    fname = (char*) malloc((pathSize + nameSize + extSize + 3) * sizeof(char));
    strcpy(fname, path);

    // Added file neme

    if (fname[pathSize - 1] != dirDelimiter && nameSize > 0){
        fname[pathSize] = dirDelimiter;
        pathSize += 1;
        fname[pathSize] = '\0';
    }
    strcat(fname, name);
    strcat(fname, ".");
    strcat(fname, ext);
    return fname;
}

uint_least32_t
Crc32(const unsigned char * buf, size_t len)
{
    uint_least32_t crc = 0xFFFFFFFF;
    while (len--)
        crc = (crc >> 8) ^ Crc32Table[(crc ^ *buf++) & 0xFF];
    return crc ^ 0xFFFFFFFF;
}

uint_least32_t
Crc32Add(const unsigned char * buf, size_t len, uint_least32_t crc)
{
    //uint_least32_t crc = 0xFFFFFFFF;
    while (len--)
        crc = (crc >> 8) ^ Crc32Table[(crc ^ *buf++) & 0xFF];
    return crc ^ 0xFFFFFFFF;
}

int
hfOpenRead(HfInfo* hf, const char* filename)
{
    hf->hash = 0;
#ifdef _DEBUG_TOOLS
    hf->fileLog = NULL;
#endif // _DEBUG

    if (filename == NULL) {
        return FILE_NOT_FOUND;
    }
    hf->file = fopen(filename, "rb");
    if (hf->file == NULL){
        return  FILE_NOT_FOUND;
    }
    return FILE_OK;
}


int
hfOpenWrite(HfInfo* hf, const char* filename)
{
    hf->hash = 0;
#ifdef _DEBUG_TOOLS
    {
        char* logName = hfCreateFullPatch(filename, "", "log");
        hf->fileLog = fopen(logName, "w");
        free(logName);
    }
#endif // _DEBUG
    hf->file = fopen(filename, "wb");
    if (!hf->file){
        return FILE_ERROR_OPEN_FOR_WRITING;
    }

    return FILE_OK;
}

int
hfOpenReWrite(HfInfo* hf, const char* filename)
{
    hf->hash = 0;
    if (hf->file != NULL){
        hfClose(hf);
    }


#ifdef _DEBUG_TOOLS
    {
        char* logName = hfCreateFullPatch(filename, "", "log");
        hf->fileLog = fopen(logName, "a");
        fprintf(hf->fileLog, " ====================== \n");
        free(logName);
    }
#endif // _DEBUG
    hf->file = fopen(filename, "rb+");
    return FILE_OK;
}

int
hfClose( HfInfo* hf )
{
    int ret = 0;
    if (hf->file != NULL){
        ret = fclose(hf->file);
        hf->file = NULL;
    }
#ifdef _DEBUG_TOOLS
    if (hf->fileLog != NULL){
        ret = fclose(hf->fileLog);
        hf->fileLog = NULL;
    }
#endif // _DEBUG
    return ret;
}

int
hfWrite( HfInfo* hf, const void* buff, size_t size )
{
    hf->hash = Crc32Add(buff, size, hf->hash);
#ifdef _DEBUG_TOOLS
    hf->start = ftell(hf->file);
#endif // _DEBUG
    fwrite(buff, size, 1, hf->file);
#ifdef _DEBUG_TOOLS
    hf->end = ftell(hf->file);
    fprintf(hf->fileLog, "       %8d - %8d (%8d) \n",(int)hf->start, (int)hf->end, (int)size );
    fflush(hf->fileLog);
#endif // _DEBUG
    return 0;
}

int
hfWriteCRC( HfInfo* hf )
{
#ifdef _DEBUG_TOOLS
    hf->start = ftell(hf->file);
#endif // _DEBUG
    fwrite (&hf->hash, sizeof(hf->hash), 1, hf->file);
    hf->hash = 0;

#ifdef _DEBUG_TOOLS
    hf->end = ftell(hf->file);
    fprintf(hf->fileLog, "CRC    %8d - %8d (%8lu) \n",(int)hf->start, (int)hf->end, sizeof(hf->hash) );
    fflush(hf->fileLog);
#endif // _DEBUG
    //}
    fflush(hf->file);
    return FILE_OK;
}

int
hfReadWithoutCRC( HfInfo* hf, void* buff, size_t size )
{
    size_t readSize;
    readSize = fread(buff, 1, size, hf->file);
    return (int)readSize;
}

int
hfRead( HfInfo* hf, void* buff, int c, size_t size )
{
    size_t readSize;
    int i=0;
#ifdef _DEBUG_TOOLS
    hf->start = ftell(hf->file);
#endif // _DEBUG

    readSize = fread(buff, size, c, hf->file);
    if (readSize != (size_t)c){
        return FILE_ERROR_READ_DATA;
    }
    for (; i < c; ++i){
        hf->hash = Crc32Add((const unsigned char*)buff + (i*size), size, hf->hash);
    }
#ifdef _DEBUG_TOOLS
    hf->end = ftell(hf->file);
#endif // _DEBUG
    return FILE_OK;
}

int
hfReadConst( HfInfo* hf, const void* buff, size_t size )
{
    int ret;
    void* buff2 = malloc(size);
    ret = FILE_OK;
    hfRead(hf, buff2, 1,  size);
    if (memcmp(buff, buff2, size) != 0){
        ret = FILE_ERROR_BUFFER_MISMATCH;
    }
    free(buff2);
    //hf->isUseHach = true;
    return ret;

}

int
hfCheckCRC( HfInfo* hf )
{
    int ret;
    TYPECRC crc = 0;
    size_t readSize;

#ifdef _DEBUG_TOOLS
    hf->start = ftell(hf->file);
#endif // _DEBUG

    readSize = fread(&crc, sizeof(crc), 1, hf->file);
    if (readSize == 1){
        if (crc == hf->hash){
            ret = FILE_OK;
        }
        else {
            ret = FILE_ERROR_CRC;
        }

    }
    else {
        ret = FILE_ERROR_READ_DATA;
    }

#ifdef _DEBUG_TOOLS
    hf->end = ftell(hf->file);
#endif // _DEBUG

    hf->hash = 0;
    return ret ;
}

int
hfReadString( HfInfo* hf, char** str )
{
    int status;
    unsigned int strLen;
    //long int pos = ftell(hf->file);
    status = hfRead(hf, &strLen, 1,  sizeof(unsigned int));
    *str =  malloc(strLen + 1);
    status += hfRead(hf, *str, 1, (size_t)strLen);
    (*str)[strLen] = '\0';
    return status;
}

int
hfWriteString( HfInfo* hf, const char* buff )
{
    int status;
    unsigned int strLen = (unsigned int)strlen(buff);
    status = hfWrite(hf, &strLen, sizeof(unsigned int));
    status = hfWrite(hf, buff, strLen);
    return status;
}


int
hfJump( HfInfo* hf, POSFILE pos )
{
    fseek(hf->file, (long)pos, SEEK_SET);
    hf->hash = 0;
    return FILE_OK;
}

int
hfGetCurentPosition( HfInfo* hf, POSFILE* pos )
{
    *pos = ftell(hf->file);
    return FILE_OK;
}
