}

/*
** Strip a possible byte-order-mark (BOM) from the blob. On Windows, if there
** is either no BOM at all or an (le/be) UTF-16 BOM, a conversion to UTF-8 is
** done.  If useMbcs is false and there is no BOM, the input string is assumed
** to be UTF-8 already, so no conversion is done.
** If useMbcs is 2, any BOM is replaced by the UTF-8 BOM
*/
void blob_to_utf8_no_bom(Blob *pBlob, int useMbcs){
  char *zUtf8;
  int bomSize = 0;
  int bomReverse = 0;

  if( starts_with_utf8_bom(pBlob, &bomSize) ){
    struct Blob temp;
    zUtf8 = blob_str(pBlob) + bomSize;
    blob_zero(&temp);
    blob_append(&temp, zUtf8, -1);
    blob_swap(pBlob, &temp);
    blob_reset(&temp);

      }
    }
    /* Make sure the blob contains two terminating 0-bytes */
    blob_append(pBlob, "", 1);
    zUtf8 = blob_str(pBlob) + bomSize;
    zUtf8 = fossil_unicode_to_utf8(zUtf8);
    blob_zero(pBlob);
    if( useMbcs>1 ){
      const unsigned char *bom = get_utf8_bom(&bomSize);
      blob_append(pBlob, (char*)bom, bomSize);
    }
    blob_append(pBlob, zUtf8, -1);
    fossil_unicode_free(zUtf8);
#endif /* _WIN32 ||  __CYGWIN__ */
#if defined(_WIN32)
  }else if( useMbcs ){
    zUtf8 = fossil_mbcs_to_utf8(blob_str(pBlob));
    blob_reset(pBlob);
    blob_append(pBlob, zUtf8, -1);
    fossil_mbcs_free(zUtf8);
#endif /* _WIN32 */
  }
}

  if( allOk ) return 0;
  fUnicode = could_be_utf16(p, &bReverse);
  if( fUnicode ){
    lookFlags = looks_like_utf16(p, bReverse);
  }else{
    lookFlags = looks_like_utf8(p);
  }
  if( !lookFlags || lookFlags&(LOOK_LONG|LOOK_LONE_CR|LOOK_CRLF|LOOK_UNICODE) ){
    const char *zWarning;
    const char *zDisable;
    const char *zConvert = "c=convert/";
    Blob ans;
    char cReply;

    if( !lookFlags || (lookFlags&LOOK_LONG) ){
      if( binOk ){
        return 0; /* We don't want binary warnings for this file. */
      }
      if( lookFlags&LOOK_LONE_CR ){
        zWarning = "CR line endings (would be handled as binary)";
      }else if( lookFlags&LOOK_LONG ){
        zWarning = "long lines";
        zConvert = ""; /* We cannot convert binary files. */
      }else{
        zWarning = "binary data";
        zConvert = ""; /* We cannot convert binary files. */
      }
      zDisable = "\"binary-glob\" setting";

/*
** These error messages are shared in multiple locations.  They are defined
** here for consistency.
*/
#define DIFF_CANNOT_COMPUTE_BINARY \
    "cannot compute difference between binary files\n"

#define DIFF_CANNOT_COMPUTE_ENCODING \
    "cannot compute difference between files with different encodings\n"

#define DIFF_CANNOT_COMPUTE_SYMLINK \
    "cannot compute difference between symlink and regular file\n"

#define DIFF_TOO_MANY_CHANGES_TXT \
    "more than 10,000 changes\n"

#define DIFF_TOO_MANY_CHANGES_HTML \
    "<p class='generalError'>More than 10,000 changes</p>\n"

/*
** This macro is designed to return zero if the specified blob is binary
** in nature (contains NUL bytes).
*/
#define looks_like_text(lookFlags, blob) \
  do { \
    int result = 0; \
    if (could_be_utf16(blob, &result)) { \
      result = looks_like_utf16(blob, result); \
    }else{ \
      result = looks_like_utf8(blob); \
    } \
    (lookFlags) = result&(LOOK_TEXT|LOOK_LONG); \
  }while(0)

/*
** Output flags for the looks_like_utf8() and looks_like_utf16() routines used
** to convey status information about the blob content.
*/
#define LOOK_NONE    ((int)0x00000000) /* Nothing special was found. */
#define LOOK_UNICODE ((int)0x00000002) /* Might contain valid Unicode. */
#define LOOK_TEXT    ((int)0x00000003) /* 0=binary,1=text, 2=UTF16, 3=reversed-UTF16 */
#define LOOK_CR      ((int)0x00000004) /* One or more CR chars were found. */
#define LOOK_LONE_CR ((int)0x00000008) /* An unpaired CR char was found. */
#define LOOK_LF      ((int)0x00000010) /* One or more LF chars were found. */
#define LOOK_LONE_LF ((int)0x00000020) /* An unpaired CR char was found. */
#define LOOK_CRLF    ((int)0x00000040) /* One or more CR/LF pairs were found. */
#define LOOK_LONG    ((int)0x00000080) /* An over length line was found. */
#define LOOK_ODD     ((int)0x00000100) /* An odd number of bytes was found. */

#endif /* INTERFACE */

/*
** Maximum length of a line in a text file, in bytes.  (2**13 = 8192 bytes)
*/
#define LENGTH_MASK_SZ  13
#define LENGTH_MASK     ((1<<LENGTH_MASK_SZ)-1)

** officially unspecified.
**
************************************ WARNING **********************************
*/
int looks_like_utf8(const Blob *pContent){
  const char *z = blob_buffer(pContent);
  unsigned int n = blob_size(pContent);
  int j, c, flags = 1;  /* Assume UTF-8 text, prove otherwise */

  if( n==0 ) return flags;  /* Empty file -> text */
  c = *z;
  if( c==0 ){
    return 0;  /* NUL character in a file -> binary */
  }else if( c=='\r' ){
    flags |= LOOK_CR;
    if( n<=1 || z[1]!='\n' ){
      flags |= LOOK_LONE_CR;  /* More chars, next char is not LF */
    }
  }
  j = (c!='\n');
  if( !j ) flags |= (LOOK_LF | LOOK_LONE_LF);  /* Found LF as first char */
  while( --n>0 ){
    int c2 = c;
    c = *++z; ++j;
    if( c==0 ){
      return 0;  /* NUL character in a file -> binary */
    }else if( c=='\n' ){
      flags |= LOOK_LF;
      if( c2=='\r' ){
        flags |= LOOK_CRLF;  /* Found LF preceded by CR */
      }else{
        flags |= LOOK_LONE_LF;
      }

#    define WCHAR_T wchar_t
#  else
#    define WCHAR_T unsigned short
#  endif
#endif

/*
** Maximum length of a line in a text file, in UTF-16 characters.  (2731)
** The number of characters represented by this value cannot exceed
** LENGTH_UTF16_LENGTH_MASK characters, because when converting UTF-16
** to UTF-8 it could overflow the line buffer used by the diff engine.
*/

#define UTF16_LENGTH_MASK     (LENGTH_MASK/3)

/*
** This macro is used to swap the byte order of a UTF-16 character in the
** looks_like_utf16() function.
*/
#define UTF16_SWAP(ch)        (((ch) << 8) & 0xFF00) | (((ch) >> 8) & 0xFF)

** officially unspecified.
**
************************************ WARNING **********************************
*/
int looks_like_utf16(const Blob *pContent, int bReverse){
  const WCHAR_T *z = (WCHAR_T *)blob_buffer(pContent);
  unsigned int n = blob_size(pContent);
  int j, c, flags = 2|(bReverse!=0);  /* Assume UTF-16 text, prove otherwise */

  if( n==0 ) return flags;  /* Empty file -> text */
  if( n%sizeof(WCHAR_T) ){
    flags |= LOOK_ODD;  /* Odd number of bytes -> binary (UTF-8?) */
    if( n<sizeof(WCHAR_T) ) return flags;  /* One byte -> binary (UTF-8?) */
  }
  c = *z;
  if( c==0 )
    return 0;  /* NUL character in a file -> binary */
  if( bReverse ){
    c = UTF16_SWAP(c);
  }
  j = (c!='\n');
  if( !j ) flags |= (LOOK_LF | LOOK_LONE_LF);  /* Found LF as first char */
  while( 1 ){
    int c2 = c;
    n -= sizeof(WCHAR_T);
    if( n<sizeof(WCHAR_T) ) break;
    c = *++z;
    ++j;
    if( c==0 )
      return 0;  /* NUL character in a file -> binary */
    if( bReverse ){
      c = UTF16_SWAP(c);
    }
    if( c=='\n' ){
      if( c2=='\r' ){
        flags |= (LOOK_CRLF | LOOK_CR | LOOK_LF);
      }else{
        flags |= (LOOK_LONE_LF | LOOK_LF);

  lookFlags = fUnicode ? looks_like_utf16(&blob, bReverse) :
                       looks_like_utf8(&blob);
  fossil_print("File \"%s\" has %d bytes.\n",g.argv[2],blob_size(&blob));
  fossil_print("Starts with UTF-8 BOM: %s\n",fUtf8?"yes":"no");
  fossil_print("Starts with UTF-16 BOM: %s\n",
               fUtf16?(bReverse?"reversed":"yes"):"no");
  fossil_print("Looks like UTF-%s: %s\n",fUnicode?"16":"8",
               ((lookFlags==0) || (lookFlags&LOOK_LONG))?"no":"yes");
  fossil_print("Has flag LOOK_NUL: %s\n",(lookFlags==0)?"yes":"no");
  fossil_print("Has flag LOOK_CR: %s\n",(lookFlags&LOOK_CR)?"yes":"no");
  fossil_print("Has flag LOOK_LONE_CR: %s\n",
               (lookFlags&LOOK_LONE_CR)?"yes":"no");
  fossil_print("Has flag LOOK_LF: %s\n",(lookFlags&LOOK_LF)?"yes":"no");
  fossil_print("Has flag LOOK_LONE_LF: %s\n",
               (lookFlags&LOOK_LONE_LF)?"yes":"no");
  fossil_print("Has flag LOOK_CRLF: %s\n",(lookFlags&LOOK_CRLF)?"yes":"no");
  fossil_print("Has flag LOOK_LONG: %s\n",(lookFlags&LOOK_LONG)?"yes":"no");
  fossil_print("Has flag LOOK_ODD: %s\n",(lookFlags&LOOK_ODD)?"yes":"no");
  blob_reset(&blob);
}

**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
void diff_file(
  Blob *pFile1,             /* In memory content to compare from */
  int eType1,               /* Does the 'from' content appear to be text */
  const char *zFile2,       /* On disk content to compare to */
  const char *zName,        /* Display name of the file */
  const char *zDiffCmd,     /* Command for comparison */
  const char *zBinGlob,     /* Treat file names matching this as binary */
  int fIncludeBinary,       /* Include binary files for external diff */
  u64 diffFlags             /* Flags to control the diff */
){
  if( zDiffCmd==0 ){
    Blob out;                 /* Diff output text */
    Blob file2;               /* Content of zFile2 */
    const char *zName2;       /* Name of zFile2 for display */
    int eType2 = 0;

    /* Read content of zFile2 into memory */
    blob_zero(&file2);
    if( file_wd_size(zFile2)<0 ){
      zName2 = NULL_DEVICE;
    }else{
      if( file_wd_islink(zFile2) ){
        blob_read_link(&file2, zFile2);
      }else{
        blob_read_from_file(&file2, zFile2);
      }
      zName2 = zName;
    }
    if( !fIncludeBinary ){
      looks_like_text(eType2, &file2);
    }
    /* Compute and output the differences */
    if( diffFlags & DIFF_BRIEF ){
      if( blob_compare(pFile1, &file2) ){
        fossil_print("CHANGED  %s\n", zName);
      }
    }else if( eType1!=eType2 ){
      fossil_print(DIFF_CANNOT_COMPUTE_ENCODING);
    }else{
      blob_to_utf8_no_bom(pFile1, 2);
      blob_to_utf8_no_bom(&file2, 2);
      blob_zero(&out);
      text_diff(pFile1, &file2, &out, 0, diffFlags);
      if( blob_size(&out) ){
        diff_print_filenames(zName, zName2, diffFlags);
        fossil_print("%s\n", blob_str(&out));
      }
      blob_reset(&out);
    }

    /* Release memory resources */
    blob_reset(&file2);
  }else{
    int cnt = 0;
    Blob nameFile1;    /* Name of temporary file to old pFile1 content */
    Blob cmd;          /* Text of command to run */

    if( !fIncludeBinary ){
      Blob file2;
      int eType2;
      if( eType1!=1 ){
        fossil_print(DIFF_CANNOT_COMPUTE_BINARY);
        return;
      }
      if( zBinGlob ){
        Glob *pBinary = glob_create(zBinGlob);
        if( glob_match(pBinary, zName) ){
          fossil_print(DIFF_CANNOT_COMPUTE_BINARY);
          glob_free(pBinary);
          return;
        }
        glob_free(pBinary);
      }
      blob_zero(&file2);
      if( file_wd_size(zFile2)>=0 ){
        if( file_wd_islink(zFile2) ){
          blob_read_link(&file2, zFile2);
        }else{
          blob_read_from_file(&file2, zFile2);
        }
      }
      looks_like_text(eType2, &file2);
      if( (eType2&3)!=1 ){
        fossil_print(DIFF_CANNOT_COMPUTE_BINARY);
        blob_reset(&file2);
        return;
      }
      blob_reset(&file2);
    }

** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
void diff_file_mem(
  Blob *pFile1,             /* In memory content to compare from */
  Blob *pFile2,             /* In memory content to compare to */
  int eType,                /* Does the content appear to be text */

  const char *zName,        /* Display name of the file */
  const char *zDiffCmd,     /* Command for comparison */
  const char *zBinGlob,     /* Treat file names matching this as binary */
  int fIncludeBinary,       /* Include binary files for external diff */
  u64 diffFlags             /* Diff flags */
){
  if( diffFlags & DIFF_BRIEF ) return;
  if( zDiffCmd==0 ){
    Blob out;      /* Diff output text */

    blob_zero(&out);
    blob_to_utf8_no_bom(pFile1, 2);
    blob_to_utf8_no_bom(pFile2, 2);
    text_diff(pFile1, pFile2, &out, 0, diffFlags);
    diff_print_filenames(zName, zName, diffFlags);
    fossil_print("%s\n", blob_str(&out));

    /* Release memory resources */
    blob_reset(&out);
  }else{
    Blob cmd;
    char zTemp1[300];
    char zTemp2[300];

    if( !fIncludeBinary ){
      if( eType==0 ){
        fossil_print(DIFF_CANNOT_COMPUTE_BINARY);
        return;
      }
      if( zBinGlob ){
        Glob *pBinary = glob_create(zBinGlob);
        if( glob_match(pBinary, zName) ){
          fossil_print(DIFF_CANNOT_COMPUTE_BINARY);

  int fIncludeBinary,       /* Include binary files for external diff */
  u64 diffFlags,            /* Diff control flags */
  const char *zFileTreeName
){
  Blob fname;
  Blob content;
  int isLink;
  int eType = 0;
  file_tree_name(zFileTreeName, &fname, 1);
  historical_version_of_file(zFrom, blob_str(&fname), &content, &isLink, 0,
                             fIncludeBinary ? 0 : &eType, 0);
  if( !isLink != !file_wd_islink(zFrom) ){
    fossil_print(DIFF_CANNOT_COMPUTE_SYMLINK);
  }else{
    diff_file(&content, eType, zFileTreeName, zFileTreeName,
              zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
  }
  blob_reset(&content);
  blob_reset(&fname);
}

/*

    }else if( isChnged==3 ){
      fossil_print("ADDED_BY_MERGE %s\n", zPathname);
      srcid = 0;
      if( !asNewFile ){ showDiff = 0; }
    }
    if( showDiff ){
      Blob content;
      int eType = 0;
      if( !isLink != !file_wd_islink(zFullName) ){
        diff_print_index(zPathname, diffFlags);
        diff_print_filenames(zPathname, zPathname, diffFlags);
        fossil_print(DIFF_CANNOT_COMPUTE_SYMLINK);
        continue;
      }
      if( srcid>0 ){
        content_get(srcid, &content);
      }else{
        blob_zero(&content);
      }
      if( !fIncludeBinary ){
        looks_like_text(eType, &content);
      }
      diff_print_index(zPathname, diffFlags);
      diff_file(&content, eType, zFullName, zPathname, zDiffCmd,
                zBinGlob, fIncludeBinary, diffFlags);
      blob_reset(&content);
    }
    free(zToFree);
  }
  db_finalize(&q);
  db_end_transaction(1);  /* ROLLBACK */

  u64 diffFlags,
  const char *zFileTreeName
){
  char *zName;
  Blob fname;
  Blob v1, v2;
  int isLink1, isLink2;
  int eType = 0, eType2 = 0;
  if( diffFlags & DIFF_BRIEF ) return;
  file_tree_name(zFileTreeName, &fname, 1);
  zName = blob_str(&fname);
  historical_version_of_file(zFrom, zName, &v1, &isLink1, 0,
                             fIncludeBinary ? 0 : &eType, 0);
  historical_version_of_file(zTo, zName, &v2, &isLink2, 0,
                             fIncludeBinary ? 0 : &eType2, 0);
  if( isLink1 != isLink2 ){
    diff_print_filenames(zName, zName, diffFlags);
    fossil_print(DIFF_CANNOT_COMPUTE_SYMLINK);
  }else if( eType!=eType2 ){
    diff_print_filenames(zName, zName, diffFlags);
    fossil_print(DIFF_CANNOT_COMPUTE_ENCODING);
  }else{
    diff_file_mem(&v1, &v2, eType, zName, zDiffCmd,
                  zBinGlob, fIncludeBinary, diffFlags);
  }
  blob_reset(&v1);
  blob_reset(&v2);
  blob_reset(&fname);
}

  struct ManifestFile *pTo,
  const char *zDiffCmd,
  const char *zBinGlob,
  int fIncludeBinary,
  u64 diffFlags
){
  Blob f1, f2;
  int eType = 0, eType2 = 0;
  int rid;
  const char *zName =  pFrom ? pFrom->zName : pTo->zName;
  if( diffFlags & DIFF_BRIEF ) return;
  diff_print_index(zName, diffFlags);
  if( pFrom ){
    rid = uuid_to_rid(pFrom->zUuid, 0);
    content_get(rid, &f1);
  }else{
    blob_zero(&f1);
  }
  if( pTo ){
    rid = uuid_to_rid(pTo->zUuid, 0);
    content_get(rid, &f2);
  }else{
    blob_zero(&f2);
  }
  if ( !fIncludeBinary ){
    looks_like_text(eType, &f1);
    looks_like_text(eType2, &f2);
  }
  if( eType!=eType2 ){
    diff_print_filenames(zName, zName, diffFlags);
    fossil_print(DIFF_CANNOT_COMPUTE_ENCODING);
  }else{
    diff_file_mem(&f1, &f2, eType, zName, zDiffCmd,
                  zBinGlob, fIncludeBinary, diffFlags);
  }
  blob_reset(&f1);
  blob_reset(&f2);
}

/*
** Output the differences between two check-ins.
**

     "  FROM stashfile WHERE stashid=%d",
     stashid
  );
  while( db_step(&q)==SQLITE_ROW ){
    int rid = db_column_int(&q, 0);
    int isRemoved = db_column_int(&q, 1);
    int isLink = db_column_int(&q, 3);
    int eType = 0;
    const char *zOrig = db_column_text(&q, 4);
    const char *zNew = db_column_text(&q, 5);
    char *zOPath = mprintf("%s%s", g.zLocalRoot, zOrig);
    Blob delta, a, b, disk;
    if( rid==0 ){
      db_ephemeral_blob(&q, 6, &a);
      fossil_print("ADDED %s\n", zNew);
      diff_print_index(zNew, diffFlags);
      if( !fIncludeBinary ){
        looks_like_text(eType, &a);
      }
      diff_file_mem(&empty, &a, eType, zNew, zDiffCmd,
                    zBinGlob, fIncludeBinary, diffFlags);
    }else if( isRemoved ){
      fossil_print("DELETE %s\n", zOrig);
      if( fBaseline==0 ){
        if( file_wd_islink(zOPath) ){
          blob_read_link(&a, zOPath);
        }else{
          blob_read_from_file(&a, zOPath);
        }
      }else{
        content_get(rid, &a);
      }
      diff_print_index(zNew, diffFlags);
      if( !fIncludeBinary){
        looks_like_text(eType, &a);
      }
      diff_file_mem(&a, &empty, eType, zOrig, zDiffCmd,
                    zBinGlob, fIncludeBinary, diffFlags);
    }else{
      int isOrigLink = file_wd_islink(zOPath);
      db_ephemeral_blob(&q, 6, &delta);
      if( fBaseline==0 ){
        if( isOrigLink ){
          blob_read_link(&disk, zOPath);
        }else{
          blob_read_from_file(&disk, zOPath);
        }
      }
      fossil_print("CHANGED %s\n", zNew);
      if( !isOrigLink != !isLink ){
        diff_print_index(zNew, diffFlags);
        diff_print_filenames(zOrig, zNew, diffFlags);
        printf(DIFF_CANNOT_COMPUTE_SYMLINK);
      }else{
        Blob *pBase = fBaseline ? &a : &disk;
        content_get(rid, &a);
        blob_delta_apply(&a, &delta, &b);
        int eType2 = 0;
        if( !fIncludeBinary ){
          looks_like_text(eType, pBase);
          looks_like_text(eType2, &b);
        }
        if( eType!=eType2 ){
          diff_print_filenames(zOrig, zNew, diffFlags);
          printf(DIFF_CANNOT_COMPUTE_ENCODING);
        }else{
          diff_file_mem(pBase, &b, eType, zNew, zDiffCmd,
                        zBinGlob, fIncludeBinary, diffFlags);
        }
        blob_reset(&a);
        blob_reset(&b);
      }
      if( !fBaseline ) blob_reset(&disk);
    }
    blob_reset(&delta);
  }
  db_finalize(&q);
}

/*
** Drop the indicated stash
*/
static void stash_drop(int stashid){

*/
int historical_version_of_file(
  const char *revision,    /* The checkin containing the file */
  const char *file,        /* Full treename of the file */
  Blob *content,           /* Put the content here */
  int *pIsLink,            /* Set to true if file is link. */
  int *pIsExe,             /* Set to true if file is executable */
  int *pEType,             /* Set to file type, looks_like_text() */
  int errCode              /* Error code if file not found.  Panic if 0. */
){
  Manifest *pManifest;
  ManifestFile *pFile;
  int rid=0;
  
  if( revision ){

    if( pFile ){
      int rc;
      rid = uuid_to_rid(pFile->zUuid, 0);
      if( pIsExe ) *pIsExe = ( manifest_file_mperm(pFile)==PERM_EXE );
      if( pIsLink ) *pIsLink = ( manifest_file_mperm(pFile)==PERM_LNK );
      manifest_destroy(pManifest);
      rc = content_get(rid, content);
      if( rc && pEType ){
        looks_like_text(*pEType, content);
      }
      return rc;
    }
    manifest_destroy(pManifest);
    if( errCode<=0 ){
      fossil_fatal("file %s does not exist in checkin: %s", file, revision);
    }

# This is a makefile for use on Cygwin/Darwin/FreeBSD/Linux/Windows using
# MinGW or MinGW-w64.
#

#### Select one of MinGW, MinGW-w64 (32-bit) or MinGW-w64 (64-bit) compilers.
#    By default, this is an empty string (i.e. use the native compiler).
#
# PREFIX =
# PREFIX = mingw32-
# PREFIX = i686-pc-mingw32-
PREFIX = i686-w64-mingw32-
# PREFIX = x86_64-w64-mingw32-

#### The toplevel directory of the source tree.  Fossil can be built
#    in a directory that is separate from the source tree.  Just change
#    the following to point from the build directory to the src/ folder.
#
SRCDIR = src