/*
*  xxhsum - Command line interface for xxhash algorithms
*  Copyright (C) Yann Collet 2012-2016
*
*  GPL v2 License
*
*  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.
*
*  You can contact the author at :
*  - xxHash homepage : http://www.xxhash.com
*  - xxHash source repository : https://github.com/Cyan4973/xxHash
*/

/* xxhsum :
 * Provides hash value of a file content, or a list of files, or stdin
 * Display convention is Big Endian, for both 32 and 64 bits algorithms
 */

#ifndef XXHASH_C_2097394837
#define XXHASH_C_2097394837

/* ************************************
*  Compiler Options
**************************************/
/* MS Visual */
#if defined(_MSC_VER) || defined(_WIN32)
#  define _CRT_SECURE_NO_WARNINGS   /* removes visual warnings */
#endif

/* Under Linux at least, pull in the *64 commands */
#ifndef _LARGEFILE64_SOURCE
#  define _LARGEFILE64_SOURCE
#endif


/* ************************************
*  Includes
**************************************/
#include <stdlib.h>     /* malloc, calloc, free, exit */
#include <stdio.h>      /* fprintf, fopen, ftello64, fread, stdin, stdout; when present : _fileno */
#include <string.h>     /* strcmp */
#include <sys/types.h>  /* stat64 */
#include <sys/stat.h>   /* stat64 */
#include <time.h>       /* clock_t, clock, CLOCKS_PER_SEC */

#define XXH_STATIC_LINKING_ONLY   /* *_state_t */
#include "xxhash.h"


/*-************************************
*  OS-Specific Includes
**************************************/
#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__)
#  include <fcntl.h>    /* _O_BINARY */
#  include <io.h>       /* _setmode, _isatty */
#  ifdef __MINGW32__
   int _fileno(FILE *stream);   /* MINGW somehow forgets to include this windows declaration into <stdio.h> */
#  endif
#  define SET_BINARY_MODE(file) _setmode(_fileno(file), _O_BINARY)
#  define IS_CONSOLE(stdStream) _isatty(_fileno(stdStream))
#else
#  include <unistd.h>   /* isatty, STDIN_FILENO */
#  define SET_BINARY_MODE(file)
#  define IS_CONSOLE(stdStream) isatty(STDIN_FILENO)
#endif

#if !defined(S_ISREG)
#  define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
#endif


/* ************************************
*  Basic Types
**************************************/
#ifndef MEM_MODULE
# define MEM_MODULE
# if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L   /* C99 */
#   include <stdint.h>
    typedef uint8_t  BYTE;
    typedef uint16_t U16;
    typedef uint32_t U32;
    typedef  int32_t S32;
    typedef uint64_t U64;
#  else
    typedef unsigned char      BYTE;
    typedef unsigned short     U16;
    typedef unsigned int       U32;
    typedef   signed int       S32;
    typedef unsigned long long U64;
#  endif
#endif

static unsigned BMK_isLittleEndian(void)
{
    const union { U32 u; BYTE c[4]; } one = { 1 };   /* don't use static : performance detrimental  */
    return one.c[0];
}


/* *************************************
*  Constants
***************************************/
#define LIB_VERSION XXH_VERSION_MAJOR.XXH_VERSION_MINOR.XXH_VERSION_RELEASE
#define QUOTE(str) #str
#define EXPAND_AND_QUOTE(str) QUOTE(str)
#define PROGRAM_VERSION EXPAND_AND_QUOTE(LIB_VERSION)
static const int g_nbBits = (int)(sizeof(void*)*8);
static const char g_lename[] = "little endian";
static const char g_bename[] = "big endian";
#define ENDIAN_NAME (BMK_isLittleEndian() ? g_lename : g_bename)
static const char author[] = "Yann Collet";
#define WELCOME_MESSAGE(exename) "%s %s (%i-bits %s), by %s \n", \
                    exename, PROGRAM_VERSION, g_nbBits, ENDIAN_NAME, author

#define NBLOOPS    3                              /* Default number of benchmark iterations */
#define TIMELOOP_S 1
#define TIMELOOP  (TIMELOOP_S * CLOCKS_PER_SEC)   /* Minimum timing per iteration */
#define XXHSUM32_DEFAULT_SEED 0                   /* Default seed for algo_xxh32 */
#define XXHSUM64_DEFAULT_SEED 0                   /* Default seed for algo_xxh64 */

#define KB *( 1<<10)
#define MB *( 1<<20)
#define GB *(1U<<30)

#define MAX_MEM    (2 GB - 64 MB)

static const char stdinName[] = "-";
typedef enum { algo_xxh32, algo_xxh64 } algoType;
static const algoType g_defaultAlgo = algo_xxh64;    /* required within main() & usage() */

/* <16 hex char> <SPC> <SPC> <filename> <'\0'>
 * '4096' is typical Linux PATH_MAX configuration. */
#define DEFAULT_LINE_LENGTH (sizeof(XXH64_hash_t) * 2 + 2 + 4096 + 1)

/* Maximum acceptable line length. */
#define MAX_LINE_LENGTH (32 KB)


/* ************************************
*  Display macros
**************************************/
#define DISPLAY(...)         fprintf(stderr, __VA_ARGS__)
#define DISPLAYRESULT(...)   fprintf(stdout, __VA_ARGS__)
#define DISPLAYLEVEL(l, ...) if (g_displayLevel>=l) DISPLAY(__VA_ARGS__);
static U32 g_displayLevel = 1;


/* ************************************
*  Local variables
**************************************/
static size_t g_sampleSize = 100 KB;
static U32 g_nbIterations = NBLOOPS;


/* ************************************
*  Benchmark Functions
**************************************/
static clock_t BMK_clockSpan( clock_t start )
{
    return clock() - start;   /* works even if overflow; Typical max span ~ 30 mn */
}


static size_t BMK_findMaxMem(U64 requiredMem)
{
    size_t const step = 64 MB;
    void* testmem = NULL;

    requiredMem = (((requiredMem >> 26) + 1) << 26);
    requiredMem += 2*step;
    if (requiredMem > MAX_MEM) requiredMem = MAX_MEM;

    while (!testmem) {
        if (requiredMem > step) requiredMem -= step;
        else requiredMem >>= 1;
        testmem = malloc ((size_t)requiredMem);
    }
    free (testmem);

    /* keep some space available */
    if (requiredMem > step) requiredMem -= step;
    else requiredMem >>= 1;

    return (size_t)requiredMem;
}


static U64 BMK_GetFileSize(const char* infilename)
{
    int r;
#if defined(_MSC_VER)
    struct _stat64 statbuf;
    r = _stat64(infilename, &statbuf);
#else
    struct stat statbuf;
    r = stat(infilename, &statbuf);
#endif
    if (r || !S_ISREG(statbuf.st_mode)) return 0;   /* No good... */
    return (U64)statbuf.st_size;
}

typedef U32 (*hashFunction)(const void* buffer, size_t bufferSize, U32 seed);

static U32 localXXH32(const void* buffer, size_t bufferSize, U32 seed) { return XXH32(buffer, bufferSize, seed); }

static U32 localXXH64(const void* buffer, size_t bufferSize, U32 seed) { return (U32)XXH64(buffer, bufferSize, seed); }

static void BMK_benchHash(hashFunction h, const char* hName, const void* buffer, size_t bufferSize)
{
    static const U32 nbh_perloop = 100;
    U32 iterationNb;
    double fastestH = 100000000.;

    DISPLAY("\r%79s\r", "");       /* Clean display line */
    if (g_nbIterations<1) g_nbIterations=1;
    for (iterationNb = 1; iterationNb <= g_nbIterations; iterationNb++) {
        U32 nbHashes = 0, r=0;
        clock_t cStart;

        DISPLAY("%1i-%-17.17s : %10u ->\r", iterationNb, hName, (U32)bufferSize);
        cStart = clock();
        while (clock() == cStart);   /* starts clock() at its exact beginning */
        cStart = clock();

        while (BMK_clockSpan(cStart) < TIMELOOP) {
            U32 i;
            for (i=0; i<nbh_perloop; i++)
                r += h(buffer, bufferSize, i);
            nbHashes += nbh_perloop;
        }
        if (r==0) DISPLAY(".\r");  /* need to do something with r to avoid compiler "optimizing" away hash function */
        {   double const timeS = ((double)BMK_clockSpan(cStart) / CLOCKS_PER_SEC) / nbHashes;
            if (timeS < fastestH) fastestH = timeS;
            DISPLAY("%1i-%-17.17s : %10u -> %7.1f MB/s\r",
                    iterationNb, hName, (U32)bufferSize, ((double)bufferSize / (1<<20)) / fastestH );
        }
    }
    DISPLAY("%-19.19s : %10u -> %7.1f MB/s  \n", hName, (U32)bufferSize, ((double)bufferSize / (1<<20)) / fastestH);
}


/* Note : buffer is supposed malloc'ed, hence aligned */
static void BMK_benchMem(const void* buffer, size_t bufferSize)
{
    /* XXH32 bench */
    BMK_benchHash(localXXH32, "XXH32", buffer, bufferSize);

    /* Bench XXH32 on Unaligned input */
    BMK_benchHash(localXXH32, "XXH32 unaligned", ((const char*)buffer)+1, bufferSize);

    /* Bench XXH64 */
    BMK_benchHash(localXXH64, "XXH64", buffer, bufferSize);

    /* Bench XXH64 on Unaligned input */
    BMK_benchHash(localXXH64, "XXH64 unaligned", ((const char*)buffer)+3, bufferSize);
}


static size_t BMK_selectBenchedSize(const char* fileName)
{   U64 const inFileSize = BMK_GetFileSize(fileName);
    size_t benchedSize = (size_t) BMK_findMaxMem(inFileSize);
    if ((U64)benchedSize > inFileSize) benchedSize = (size_t)inFileSize;
    if (benchedSize < inFileSize) {
        DISPLAY("Not enough memory for '%s' full size; testing %i MB only...\n", fileName, (int)(benchedSize>>20));
    }
    return benchedSize;
}


static int BMK_benchFiles(const char** fileNamesTable, int nbFiles)
{
    int fileIdx;
    for (fileIdx=0; fileIdx<nbFiles; fileIdx++) {
        const char* const inFileName = fileNamesTable[fileIdx];
        FILE* const inFile = fopen( inFileName, "rb" );
        size_t const benchedSize = BMK_selectBenchedSize(inFileName);
        char* const buffer = (char*)calloc(benchedSize+16+3, 1);
        void* const alignedBuffer = (buffer+15) - (((size_t)(buffer+15)) & 0xF);  /* align on next 16 bytes */

        /* Checks */
        if ((inFile==NULL) || (inFileName==NULL)) {
            DISPLAY( "Pb opening %s\n", inFileName);
            free(buffer);
            return 11;
        }
        if(!buffer) {
            DISPLAY("\nError: not enough memory!\n");
            fclose(inFile);
            return 12;
        }

        /* Fill input buffer */
        DISPLAY("\rLoading %s...        \n", inFileName);
        {   size_t const readSize = fread(alignedBuffer, 1, benchedSize, inFile);
            fclose(inFile);
            if(readSize != benchedSize) {
                DISPLAY("\nError: problem reading file '%s' !!    \n", inFileName);
                free(buffer);
                return 13;
        }   }

        /* bench */
        BMK_benchMem(alignedBuffer, benchedSize);

        free(buffer);
    }

    return 0;
}


static int BMK_benchInternal(void)
{
    size_t const benchedSize = g_sampleSize;
    void* const buffer = calloc(benchedSize+3, 1);
    if(!buffer) {
        DISPLAY("\nError: not enough memory!\n");
        return 12;
    }

    /* bench */
    DISPLAY("\rSample of %u KB...        \n", (U32)(benchedSize >> 10));
    BMK_benchMem(buffer, benchedSize);

    free(buffer);
    return 0;
}


static void BMK_checkResult(U32 r1, U32 r2)
{
    static int nbTests = 1;
    if (r1==r2) DISPLAY("\rTest%3i : %08X == %08X   ok   ", nbTests, r1, r2);
    else {
        DISPLAY("\rERROR : Test%3i : %08X <> %08X   !!!!!   \n", nbTests, r1, r2);
        exit(1);
    }
    nbTests++;
}


static void BMK_checkResult64(U64 r1, U64 r2)
{
    static int nbTests = 1;
    if (r1!=r2) {
        DISPLAY("\rERROR : Test%3i : 64-bits values non equals   !!!!!   \n", nbTests);
        DISPLAY("\r %08X%08X != %08X%08X \n", (U32)(r1>>32), (U32)r1, (U32)(r2>>32), (U32)r2);
        exit(1);
    }
    nbTests++;
}


static void BMK_testSequence64(void* sentence, size_t len, U64 seed, U64 Nresult)
{
    XXH64_state_t state;
    U64 Dresult;
    size_t pos;

    Dresult = XXH64(sentence, len, seed);
    BMK_checkResult64(Dresult, Nresult);

    XXH64_reset(&state, seed);
    XXH64_update(&state, sentence, len);
    Dresult = XXH64_digest(&state);
    BMK_checkResult64(Dresult, Nresult);

    XXH64_reset(&state, seed);
    for (pos=0; pos<len; pos++) XXH64_update(&state, ((char*)sentence)+pos, 1);
    Dresult = XXH64_digest(&state);
    BMK_checkResult64(Dresult, Nresult);
}


static void BMK_testSequence(const void* sequence, size_t len, U32 seed, U32 Nresult)
{
    XXH32_state_t state;
    U32 Dresult;
    size_t pos;

    Dresult = XXH32(sequence, len, seed);
    BMK_checkResult(Dresult, Nresult);

    XXH32_reset(&state, seed);
    XXH32_update(&state, sequence, len);
    Dresult = XXH32_digest(&state);
    BMK_checkResult(Dresult, Nresult);

    XXH32_reset(&state, seed);
    for (pos=0; pos<len; pos++) XXH32_update(&state, ((const char*)sequence)+pos, 1);
    Dresult = XXH32_digest(&state);
    BMK_checkResult(Dresult, Nresult);
}


#define SANITY_BUFFER_SIZE 101
static void BMK_sanityCheck(void)
{
    static const U32 prime = 2654435761U;
    BYTE sanityBuffer[SANITY_BUFFER_SIZE];
    U32 byteGen = prime;

    int i;
    for (i=0; i<SANITY_BUFFER_SIZE; i++) {
        sanityBuffer[i] = (BYTE)(byteGen>>24);
        byteGen *= byteGen;
    }

    BMK_testSequence(NULL,          0, 0,     0x02CC5D05);
    BMK_testSequence(NULL,          0, prime, 0x36B78AE7);
    BMK_testSequence(sanityBuffer,  1, 0,     0xB85CBEE5);
    BMK_testSequence(sanityBuffer,  1, prime, 0xD5845D64);
    BMK_testSequence(sanityBuffer, 14, 0,     0xE5AA0AB4);
    BMK_testSequence(sanityBuffer, 14, prime, 0x4481951D);
    BMK_testSequence(sanityBuffer, SANITY_BUFFER_SIZE, 0,     0x1F1AA412);
    BMK_testSequence(sanityBuffer, SANITY_BUFFER_SIZE, prime, 0x498EC8E2);

    BMK_testSequence64(NULL        ,  0, 0,     0xEF46DB3751D8E999ULL);
    BMK_testSequence64(NULL        ,  0, prime, 0xAC75FDA2929B17EFULL);
    BMK_testSequence64(sanityBuffer,  1, 0,     0x4FCE394CC88952D8ULL);
    BMK_testSequence64(sanityBuffer,  1, prime, 0x739840CB819FA723ULL);
    BMK_testSequence64(sanityBuffer, 14, 0,     0xCFFA8DB881BC3A3DULL);
    BMK_testSequence64(sanityBuffer, 14, prime, 0x5B9611585EFCC9CBULL);
    BMK_testSequence64(sanityBuffer, SANITY_BUFFER_SIZE, 0,     0x0EAB543384F878ADULL);
    BMK_testSequence64(sanityBuffer, SANITY_BUFFER_SIZE, prime, 0xCAA65939306F1E21ULL);

    DISPLAY("\r%79s\r", "");       /* Clean display line */
    DISPLAYLEVEL(2, "Sanity check -- all tests ok\n");
}


/* ********************************************************
*  File Hashing
**********************************************************/

static void BMK_display_LittleEndian(const void* ptr, size_t length)
{
    const BYTE* p = (const BYTE*)ptr;
    size_t idx;
    for (idx=length-1; idx<length; idx--)    /* intentional underflow to negative to detect end */
        DISPLAYRESULT("%02x", p[idx]);
}

static void BMK_display_BigEndian(const void* ptr, size_t length)
{
    const BYTE* p = (const BYTE*)ptr;
    size_t idx;
    for (idx=0; idx<length; idx++)
        DISPLAYRESULT("%02x", p[idx]);
}

static void BMK_hashStream(void* xxhHashValue, const algoType hashType, FILE* inFile, void* buffer, size_t blockSize)
{
    XXH64_state_t state64;
    XXH32_state_t state32;
    size_t readSize;

    /* Init */
    XXH32_reset(&state32, XXHSUM32_DEFAULT_SEED);
    XXH64_reset(&state64, XXHSUM64_DEFAULT_SEED);

    /* Load file & update hash */
    readSize = 1;
    while (readSize) {
        readSize = fread(buffer, 1, blockSize, inFile);
        switch(hashType)
        {
        case algo_xxh32:
            XXH32_update(&state32, buffer, readSize);
            break;
        case algo_xxh64:
            XXH64_update(&state64, buffer, readSize);
            break;
        default:
            break;
        }
    }

    switch(hashType)
    {
    case algo_xxh32:
        {   U32 const h32 = XXH32_digest(&state32);
            memcpy(xxhHashValue, &h32, sizeof(h32));
            break;
        }
    case algo_xxh64:
        {   U64 const h64 = XXH64_digest(&state64);
            memcpy(xxhHashValue, &h64, sizeof(h64));
            break;
        }
    default:
            break;
    }
}


typedef enum { big_endian, little_endian} endianess;

static int BMK_hash(const char* fileName,
                    const algoType hashType,
                    const endianess displayEndianess)
{
    FILE*  inFile;
    size_t const blockSize = 64 KB;
    void*  buffer;
    U32    h32 = 0;
    U64    h64 = 0;

    /* Check file existence */
    if (fileName == stdinName) {
        inFile = stdin;
        SET_BINARY_MODE(stdin);
    }
    else
        inFile = fopen( fileName, "rb" );
    if (inFile==NULL) {
        DISPLAY( "Pb opening %s\n", fileName);
        return 1;
    }

    /* Memory allocation & restrictions */
    buffer = malloc(blockSize);
    if(!buffer) {
        DISPLAY("\nError: not enough memory!\n");
        fclose(inFile);
        return 1;
    }

    /* loading notification */
    {   const size_t fileNameSize = strlen(fileName);
        const char* const fileNameEnd = fileName + fileNameSize;
        const size_t maxInfoFilenameSize = fileNameSize > 30 ? 30 : fileNameSize;
        size_t infoFilenameSize = 1;
        while ( (infoFilenameSize < maxInfoFilenameSize)
              &&(fileNameEnd[-1-infoFilenameSize] != '/')
              &&(fileNameEnd[-1-infoFilenameSize] != '\\') )
              infoFilenameSize++;
        DISPLAY("\rLoading %s...  \r", fileNameEnd - infoFilenameSize);

        /* Load file & update hash */
        switch(hashType)
        {
        case algo_xxh32:
            BMK_hashStream(&h32, algo_xxh32, inFile, buffer, blockSize);
            break;
        case algo_xxh64:
            BMK_hashStream(&h64, algo_xxh64, inFile, buffer, blockSize);
            break;
        default:
            break;
        }

        fclose(inFile);
        free(buffer);
        DISPLAY("%s             \r", fileNameEnd - infoFilenameSize);  /* erase line */
    }

    /* display Hash */
    switch(hashType)
    {
    case algo_xxh32:
        {   XXH32_canonical_t hcbe32;
            XXH32_canonicalFromHash(&hcbe32, h32);
            displayEndianess==big_endian ?
                BMK_display_BigEndian(&hcbe32, sizeof(hcbe32)) : BMK_display_LittleEndian(&hcbe32, sizeof(hcbe32));
            DISPLAYRESULT("  %s\n", fileName);
            break;
        }
    case algo_xxh64:
        {   XXH64_canonical_t hcbe64;
            XXH64_canonicalFromHash(&hcbe64, h64);
            displayEndianess==big_endian ?
                BMK_display_BigEndian(&hcbe64, sizeof(hcbe64)) : BMK_display_LittleEndian(&hcbe64, sizeof(hcbe64));
            DISPLAYRESULT("  %s\n", fileName);
            break;
        }
    default:
            break;
    }

    return 0;
}


static int BMK_hashFiles(const char** fnList, int fnTotal,
                         algoType hashType, endianess displayEndianess)
{
    int fnNb;
    int result = 0;

    if (fnTotal==0)
        return BMK_hash(stdinName, hashType, displayEndianess);

    for (fnNb=0; fnNb<fnTotal; fnNb++)
        result += BMK_hash(fnList[fnNb], hashType, displayEndianess);
    DISPLAY("\r%70s\r", "");
    return result;
}


typedef enum {
    GetLine_ok,
    GetLine_eof,
    GetLine_exceedMaxLineLength,
    GetLine_outOfMemory,
} GetLineResult;

typedef enum {
    CanonicalFromString_ok,
    CanonicalFromString_invalidFormat,
} CanonicalFromStringResult;

typedef enum {
    ParseLine_ok,
    ParseLine_invalidFormat,
} ParseLineResult;

typedef enum {
    LineStatus_hashOk,
    LineStatus_hashFailed,
    LineStatus_failedToOpen,
} LineStatus;

typedef union {
    XXH32_canonical_t xxh32;
    XXH64_canonical_t xxh64;
} Canonical;

typedef struct {
    Canonical   canonical;
    const char* filename;
    int         xxhBits;    /* canonical type : 32:xxh32, 64:xxh64 */
} ParsedLine;

typedef struct {
    unsigned long   nProperlyFormattedLines;
    unsigned long   nImproperlyFormattedLines;
    unsigned long   nMismatchedChecksums;
    unsigned long   nOpenOrReadFailures;
    unsigned long   nMixedFormatLines;
    int             xxhBits;
    int             quit;
} ParseFileReport;

typedef struct {
    const char*     inFileName;
    FILE*           inFile;
    int             lineMax;
    char*           lineBuf;
    size_t          blockSize;
    char*           blockBuf;
    int             strictMode;
    int             statusOnly;
    int             warn;
    int             quiet;
    ParseFileReport report;
} ParseFileArg;


/*  Read line from stream.
    Returns GetLine_ok, if it reads line successfully.
    Returns GetLine_eof, if stream reaches EOF.
    Returns GetLine_exceedMaxLineLength, if line length is longer than MAX_LINE_LENGTH.
    Returns GetLine_outOfMemory, if line buffer memory allocation failed.
 */
static GetLineResult getLine(char** lineBuf, int* lineMax, FILE* inFile)
{
    GetLineResult result = GetLine_ok;
    int len = 0;

    if ((*lineBuf == NULL) || (*lineMax<1)) {
        free(*lineBuf);  /* in case it's != NULL */
        *lineMax = 0;
        *lineBuf = (char*)malloc(DEFAULT_LINE_LENGTH);
        if(*lineBuf == NULL) return GetLine_outOfMemory;
        *lineMax = DEFAULT_LINE_LENGTH;
    }

    for (;;) {
        const int c = fgetc(inFile);
        if (c == EOF) {
            /* If we meet EOF before first character, returns GetLine_eof,
             * otherwise GetLine_ok.
             */
            if (len == 0) result = GetLine_eof;
            break;
        }

        /* Make enough space for len+1 (for final NUL) bytes. */
        if (len+1 >= *lineMax) {
            char* newLineBuf = NULL;
            int newBufSize = *lineMax;

            newBufSize += (newBufSize/2) + 1; /* x 1.5 */
            if (newBufSize > MAX_LINE_LENGTH) newBufSize = MAX_LINE_LENGTH;
            if (len+1 >= newBufSize) return GetLine_exceedMaxLineLength;

            newLineBuf = (char*) realloc(*lineBuf, newBufSize);
            if (newLineBuf == NULL) return GetLine_outOfMemory;

            *lineBuf = newLineBuf;
            *lineMax = newBufSize;
        }

        if (c == '\n') break;
        (*lineBuf)[len++] = (char) c;
    }

    (*lineBuf)[len] = '\0';
    return result;
}


/*  Converts one hexadecimal character to integer.
 *  Returns -1, if given character is not hexadecimal.
 */
static int charToHex(char c)
{
    int result = -1;
    if (c >= '0' && c <= '9') {
        result = (int) (c - '0');
    } else if (c >= 'A' && c <= 'F') {
        result = (int) (c - 'A') + 0x0a;
    } else if (c >= 'a' && c <= 'f') {
        result = (int) (c - 'a') + 0x0a;
    }
    return result;
}


/*  Converts XXH32 canonical hexadecimal string hashStr to big endian unsigned char array dst.
 *  Returns CANONICAL_FROM_STRING_INVALID_FORMAT, if hashStr is not well formatted.
 *  Returns CANONICAL_FROM_STRING_OK, if hashStr is parsed successfully.
 */
static CanonicalFromStringResult canonicalFromString(unsigned char* dst,
                                                     size_t dstSize,
                                                     const char* hashStr)
{
    size_t i;
    for (i = 0; i < dstSize; ++i) {
        int h0, h1;

        h0 = charToHex(hashStr[i*2 + 0]);
        if (h0 < 0) return CanonicalFromString_invalidFormat;

        h1 = charToHex(hashStr[i*2 + 1]);
        if (h1 < 0) return CanonicalFromString_invalidFormat;

        dst[i] = (unsigned char) ((h0 << 4) | h1);
    }
    return CanonicalFromString_ok;
}


/*  Parse single line of xxHash checksum file.
 *  Returns PARSE_LINE_ERROR_INVALID_FORMAT, if line is not well formatted.
 *  Returns PARSE_LINE_OK if line is parsed successfully.
 *  And members of parseLine will be filled by parsed values.
 *
 *  - line must be ended with '\0'.
 *  - Since parsedLine.filename will point within given argument `line`,
 *    users must keep `line`s content during they are using parsedLine.
 *
 *  Given xxHash checksum line should have the following format:
 *
 *      <8 or 16 hexadecimal char> <space> <space> <filename...> <'\0'>
 */
static ParseLineResult parseLine(ParsedLine* parsedLine, const char* line)
{
    const char* const firstSpace = strchr(line, ' ');
    const char* const secondSpace = firstSpace + 1;

    parsedLine->filename = NULL;
    parsedLine->xxhBits = 0;

    if (firstSpace == NULL || *secondSpace != ' ') return ParseLine_invalidFormat;

    switch (firstSpace - line)
    {
    case 8:
        {   XXH32_canonical_t* xxh32c = &parsedLine->canonical.xxh32;
            if (canonicalFromString(xxh32c->digest, sizeof(xxh32c->digest), line)
                != CanonicalFromString_ok) {
                return ParseLine_invalidFormat;
            }
            parsedLine->xxhBits = 32;
            break;
        }

    case 16:
        {   XXH64_canonical_t* xxh64c = &parsedLine->canonical.xxh64;
            if (canonicalFromString(xxh64c->digest, sizeof(xxh64c->digest), line)
                != CanonicalFromString_ok) {
                return ParseLine_invalidFormat;
            }
            parsedLine->xxhBits = 64;
            break;
        }

    default:
            return ParseLine_invalidFormat;
            break;
    }

    parsedLine->filename = secondSpace + 1;
    return ParseLine_ok;
}


/*!  Parse xxHash checksum file.
 */
static void parseFile1(ParseFileArg* parseFileArg)
{
    const char* const inFileName = parseFileArg->inFileName;
    ParseFileReport* const report = &parseFileArg->report;

    unsigned long lineNumber = 0;
    memset(report, 0, sizeof(*report));

    while (!report->quit) {
        FILE* fp = NULL;
        LineStatus lineStatus = LineStatus_hashFailed;
        GetLineResult getLineResult;
        ParsedLine parsedLine;
        memset(&parsedLine, 0, sizeof(parsedLine));

        lineNumber++;
        if (lineNumber == 0) {
            /* This is unlikely happen, but md5sum.c has this
             * error check. */
            DISPLAY("%s : too many checksum lines\n", inFileName);
            report->quit = 1;
            break;
        }

        getLineResult = getLine(&parseFileArg->lineBuf, &parseFileArg->lineMax,
                                parseFileArg->inFile);
        if (getLineResult != GetLine_ok) {
            if (getLineResult == GetLine_eof) break;

            switch (getLineResult)
            {
            case GetLine_ok:
            case GetLine_eof:
                /* These cases never happen.  See above getLineResult related "if"s.
                   They exist just for make gcc's -Wswitch-enum happy. */
                break;

            default:
                DISPLAY("%s : %lu: unknown error\n", inFileName, lineNumber);
                break;

            case GetLine_exceedMaxLineLength:
                DISPLAY("%s : %lu: too long line\n", inFileName, lineNumber);
                break;

            case GetLine_outOfMemory:
                DISPLAY("%s : %lu: out of memory\n", inFileName, lineNumber);
                break;
            }
            report->quit = 1;
            break;
        }

        if (parseLine(&parsedLine, parseFileArg->lineBuf) != ParseLine_ok) {
            report->nImproperlyFormattedLines++;
            if (parseFileArg->warn) {
                DISPLAY("%s : %lu: improperly formatted XXHASH checksum line\n"
                    , inFileName, lineNumber);
            }
            continue;
        }

        if (report->xxhBits != 0 && report->xxhBits != parsedLine.xxhBits) {
            /* Don't accept xxh32/xxh64 mixed file */
            report->nImproperlyFormattedLines++;
            report->nMixedFormatLines++;
            if (parseFileArg->warn) {
                DISPLAY("%s : %lu: improperly formatted XXHASH checksum line (XXH32/64)\n"
                    , inFileName, lineNumber);
            }
            continue;
        }

        report->nProperlyFormattedLines++;
        if (report->xxhBits == 0) {
            report->xxhBits = parsedLine.xxhBits;
        }

        fp = fopen(parsedLine.filename, "rb");
        if (fp == NULL) {
            lineStatus = LineStatus_failedToOpen;
        } else {
            lineStatus = LineStatus_hashFailed;
            switch (parsedLine.xxhBits)
            {
            case 32:
                {   XXH32_hash_t xxh;
                    BMK_hashStream(&xxh, algo_xxh32, fp, parseFileArg->blockBuf, parseFileArg->blockSize);
                    if (xxh == XXH32_hashFromCanonical(&parsedLine.canonical.xxh32)) {
                        lineStatus = LineStatus_hashOk;
                }   }
                break;

            case 64:
                {   XXH64_hash_t xxh;
                    BMK_hashStream(&xxh, algo_xxh64, fp, parseFileArg->blockBuf, parseFileArg->blockSize);
                    if (xxh == XXH64_hashFromCanonical(&parsedLine.canonical.xxh64)) {
                        lineStatus = LineStatus_hashOk;
                }   }
                break;

            default:
                break;
            }
            fclose(fp);
        }

        switch (lineStatus)
        {
        default:
            DISPLAY("%s : unknown error\n", inFileName);
            report->quit = 1;
            break;

        case LineStatus_failedToOpen:
            report->nOpenOrReadFailures++;
            if (!parseFileArg->statusOnly) {
                DISPLAYRESULT("%s : %lu: FAILED open or read %s\n"
                    , inFileName, lineNumber, parsedLine.filename);
            }
            break;

        case LineStatus_hashOk:
        case LineStatus_hashFailed:
            {   int b = 1;
                if (lineStatus == LineStatus_hashOk) {
                    /* If --quiet is specified, don't display "OK" */
                    if (parseFileArg->quiet) b = 0;
                } else {
                    report->nMismatchedChecksums++;
                }

                if (b && !parseFileArg->statusOnly) {
                    DISPLAYRESULT("%s: %s\n", parsedLine.filename
                        , lineStatus == LineStatus_hashOk ? "OK" : "FAILED");
            }   }
            break;
        }
    }   /* while (!report->quit) */
}


/*  Parse xxHash checksum file.
 *  Returns 1, if all procedures were succeeded.
 *  Returns 0, if any procedures was failed.
 *
 *  If strictMode != 0, return error code if any line is invalid.
 *  If statusOnly != 0, don't generate any output.
 *  If warn != 0, print a warning message to stderr.
 *  If quiet != 0, suppress "OK" line.
 *
 *  "All procedures are succeeded" means:
 *    - Checksum file contains at least one line and less than SIZE_T_MAX lines.
 *    - All files are properly opened and read.
 *    - All hash values match with its content.
 *    - (strict mode) All lines in checksum file are consistent and well formatted.
 *
 */
static int checkFile(const char* inFileName,
                     const endianess displayEndianess,
                     U32 strictMode,
                     U32 statusOnly,
                     U32 warn,
                     U32 quiet)
{
    int result = 0;
    FILE* inFile = NULL;
    ParseFileArg parseFileArgBody;
    ParseFileArg* const parseFileArg = &parseFileArgBody;
    ParseFileReport* const report = &parseFileArg->report;

    if (displayEndianess != big_endian) {
        /* Don't accept little endian */
        DISPLAY( "Check file mode doesn't support little endian\n" );
        return 0;
    }

    /* note : stdinName is special constant pointer.  It is not a string. */
    if (inFileName == stdinName) {
        /* note : Since we expect text input for xxhash -c mode,
         * Don't set binary mode for stdin */
        inFile = stdin;
    } else {
        inFile = fopen( inFileName, "rt" );
    }

    if (inFile == NULL) {
        DISPLAY( "Pb opening %s\n", inFileName);
        return 0;
    }

    parseFileArg->inFileName    = inFileName;
    parseFileArg->inFile        = inFile;
    parseFileArg->lineMax       = DEFAULT_LINE_LENGTH;
    parseFileArg->lineBuf       = (char*) malloc((size_t) parseFileArg->lineMax);
    parseFileArg->blockSize     = 64 * 1024;
    parseFileArg->blockBuf      = (char*) malloc(parseFileArg->blockSize);
    parseFileArg->strictMode    = strictMode;
    parseFileArg->statusOnly    = statusOnly;
    parseFileArg->warn          = warn;
    parseFileArg->quiet         = quiet;

    parseFile1(parseFileArg);

    free(parseFileArg->blockBuf);
    free(parseFileArg->lineBuf);

    if (inFile != stdin) fclose(inFile);

    /* Show error/warning messages.  All messages are copied from md5sum.c
     */
    if (report->nProperlyFormattedLines == 0) {
        DISPLAY("%s: no properly formatted XXHASH checksum lines found\n", inFileName);
    } else if (!statusOnly) {
        if (report->nImproperlyFormattedLines) {
            DISPLAYRESULT("%lu lines are improperly formatted\n"
                , report->nImproperlyFormattedLines);
        }
        if (report->nOpenOrReadFailures) {
            DISPLAYRESULT("%lu listed files could not be read\n"
                , report->nOpenOrReadFailures);
        }
        if (report->nMismatchedChecksums) {
            DISPLAYRESULT("%lu computed checksums did NOT match\n"
                , report->nMismatchedChecksums);
    }   }

    /* Result (exit) code logic is copied from
     * gnu coreutils/src/md5sum.c digest_check() */
    result =   report->nProperlyFormattedLines != 0
            && report->nMismatchedChecksums == 0
            && report->nOpenOrReadFailures == 0
            && (!strictMode || report->nImproperlyFormattedLines == 0)
            && report->quit == 0;
    return result;
}


static int checkFiles(const char** fnList, int fnTotal,
                      const endianess displayEndianess,
                      U32 strictMode,
                      U32 statusOnly,
                      U32 warn,
                      U32 quiet)
{
    int ok = 1;

    /* Special case for stdinName "-",
     * note: stdinName is not a string.  It's special pointer. */
    if (fnTotal==0) {
        ok &= checkFile(stdinName, displayEndianess, strictMode, statusOnly, warn, quiet);
    } else {
        int fnNb;
        for (fnNb=0; fnNb<fnTotal; fnNb++)
            ok &= checkFile(fnList[fnNb], displayEndianess, strictMode, statusOnly, warn, quiet);
    }
    return ok ? 0 : 1;
}


/* ********************************************************
*  Main
**********************************************************/

static int usage(const char* exename)
{
    DISPLAY( WELCOME_MESSAGE(exename) );
    DISPLAY( "Usage :\n");
    DISPLAY( "      %s [arg] [filenames]\n", exename);
    DISPLAY( "When no filename provided, or - provided : use stdin as input\n");
    DISPLAY( "Arguments :\n");
    DISPLAY( " -H# : hash selection : 0=32bits, 1=64bits (default: %i)\n", (int)g_defaultAlgo);
    DISPLAY( " -c  : read xxHash sums from the [filenames] and check them\n");
    DISPLAY( " -h  : help \n");
    return 0;
}


static int usage_advanced(const char* exename)
{
    usage(exename);
    DISPLAY( "Advanced :\n");
    DISPLAY( " --little-endian : hash printed using little endian convention (default: big endian)\n");
    DISPLAY( " -V, --version   : display version\n");
    DISPLAY( " -h, --help      : display long help and exit\n");
    DISPLAY( " -b  : benchmark mode \n");
    DISPLAY( " -i# : number of iterations (benchmark mode; default %i)\n", g_nbIterations);
    DISPLAY( "\n");
    DISPLAY( "The following four options are useful only when verifying checksums (-c):\n");
    DISPLAY( "--strict : don't print OK for each successfully verified file\n");
    DISPLAY( "--status : don't output anything, status code shows success\n");
    DISPLAY( "--quiet  : exit non-zero for improperly formatted checksum lines\n");
    DISPLAY( "--warn   : warn about improperly formatted checksum lines\n");
    return 0;
}

static int badusage(const char* exename)
{
    DISPLAY("Wrong parameters\n");
    usage(exename);
    return 1;
}


int main(int argc, const char** argv)
{
    int i, filenamesStart=0;
    const char* const exename = argv[0];
    U32 benchmarkMode = 0;
    U32 fileCheckMode = 0;
    U32 strictMode    = 0;
    U32 statusOnly    = 0;
    U32 warn          = 0;
    U32 quiet         = 0;
    algoType algo = g_defaultAlgo;
    endianess displayEndianess = big_endian;

    /* special case : xxh32sum default to 32 bits checksum */
    if (strstr(exename, "xxh32sum") != NULL) algo = algo_xxh32;

    for(i=1; i<argc; i++) {
        const char* argument = argv[i];

        if(!argument) continue;   /* Protection, if argument empty */

        if (!strcmp(argument, "--little-endian")) { displayEndianess = little_endian; continue; }
        if (!strcmp(argument, "--check")) { fileCheckMode = 1; continue; }
        if (!strcmp(argument, "--strict")) { strictMode = 1; continue; }
        if (!strcmp(argument, "--status")) { statusOnly = 1; continue; }
        if (!strcmp(argument, "--quiet")) { quiet = 1; continue; }
        if (!strcmp(argument, "--warn")) { warn = 1; continue; }
        if (!strcmp(argument, "--help")) { return usage_advanced(exename); }
        if (!strcmp(argument, "--version")) { DISPLAY(WELCOME_MESSAGE(exename)); return 0; }

        if (*argument!='-') {
            if (filenamesStart==0) filenamesStart=i;   /* only supports a continuous list of filenames */
            continue;
        }

        /* command selection */
        argument++;   /* note : *argument=='-' */

        while (*argument!=0) {
            switch(*argument)
            {
            /* Display version */
            case 'V':
                DISPLAY(WELCOME_MESSAGE(exename)); return 0;

            /* Display help on usage */
            case 'h':
                return usage_advanced(exename);

            /* select hash algorithm */
            case 'H':
                algo = (algoType)(argument[1] - '0');
                argument+=2;
                break;

            /* File check mode */
            case 'c':
                fileCheckMode=1;
                argument++;
                break;

            /* Warning mode (file check mode only, alias of "--warning") */
            case 'w':
                warn=1;
                argument++;
                break;

            /* Trigger benchmark mode */
            case 'b':
                argument++;
                benchmarkMode=1;
                break;

            /* Modify Nb Iterations (benchmark only) */
            case 'i':
                g_nbIterations = argument[1] - '0';
                argument+=2;
                break;

            /* Modify Block size (benchmark only) */
            case 'B':
                argument++;
                g_sampleSize = 0;
                while (argument[0]>='0' && argument[0]<='9')
                    g_sampleSize *= 10, g_sampleSize += argument[0]-'0', argument++;
                break;

            default:
                return badusage(exename);
            }
        }
    }   /* for(i=1; i<argc; i++) */

    /* Check benchmark mode */
    if (benchmarkMode) {
        DISPLAY( WELCOME_MESSAGE(exename) );
        BMK_sanityCheck();
        if (filenamesStart==0) return BMK_benchInternal();
        return BMK_benchFiles(argv+filenamesStart, argc-filenamesStart);
    }

    /* Check if input is defined as console; trigger an error in this case */
    if ( (filenamesStart==0) && IS_CONSOLE(stdin) ) return badusage(exename);

    if (filenamesStart==0) filenamesStart = argc;
    if (fileCheckMode) {
        return checkFiles(argv+filenamesStart, argc-filenamesStart,
                          displayEndianess, strictMode, statusOnly, warn, quiet);
    } else {
        return BMK_hashFiles(argv+filenamesStart, argc-filenamesStart, algo, displayEndianess);
    }
}

#endif /* XXHASH_C_2097394837 */