540 lines
10 KiB
C++
540 lines
10 KiB
C++
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/* ---------------------------------------------------------------------------
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Nullsoft Database Engine
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--------------------
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codename: Near Death Experience
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--------------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------------
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Virtual File System
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--------------------------------------------------------------------------- */
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#include "../nde.h"
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "Vfs.h"
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#ifndef EOF
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#define EOF -1
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#endif
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/* the FILE (fopen/fwrite/etc) implementation for Mac and Linux */
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VFILE *Vfnew(const char *fl, const char *mode, int Cached)
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{
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if (!fl) return NULL;
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VFILE *f = (VFILE *)malloc(sizeof(VFILE));
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if (!f)
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return NULL;
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memset(f, 0, sizeof(VFILE));
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#ifdef NDE_ALLOW_NONCACHED
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f->cached = Cached;
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#else
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f->cached = 1;
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#endif
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if (!strchr(mode, '+'))
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{
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if (strchr(mode, 'r'))
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f->mode = VFS_READ | VFS_MUSTEXIST;
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if (strchr(mode, 'w'))
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f->mode = VFS_WRITE | VFS_CREATE | VFS_NEWCONTENT;
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if (strchr(mode, 'a'))
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f->mode = VFS_WRITE | VFS_CREATE | VFS_SEEKEOF;
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}
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else
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{
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if (strstr(mode, "r+"))
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f->mode = VFS_WRITE | VFS_MUSTEXIST;
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if (strstr(mode, "w+"))
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f->mode = VFS_WRITE | VFS_CREATE | VFS_NEWCONTENT;
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if (strstr(mode, "a+"))
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f->mode = VFS_WRITE | VFS_CREATE | VFS_SEEKEOF;
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}
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if (f->mode == 0 || ((f->mode & VFS_READ) && (f->mode & VFS_WRITE)))
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{
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free(f);
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return NULL;
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}
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snprintf(f->lockname, sizeof(f->lockname), "%s.lock", fl);
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return f;
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}
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//----------------------------------------------------------------------------
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VFILE *Vfopen(VFILE *f, const char *fl, const char *mode, int Cached)
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{
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if (!f)
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{
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f = Vfnew(fl, mode, Cached);
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if (!f)
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return 0;
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}
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if (!f && !fl) return NULL;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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f->rfile = fopen(fl, mode);
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if (f->rfile)
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f->filename = _strdup(fl);
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}
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else
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{
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free(f);
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return NULL;
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}
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return f;
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}
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#endif
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if (f->mode & VFS_MUSTEXIST)
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{
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if (access(fl, 0) != 0)
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{
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free(f);
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return NULL;
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}
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}
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if (!(f->mode & VFS_NEWCONTENT))
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{
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FILE *pf;
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pf = fopen(fl, "rb");
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if (!pf)
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{
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f->data = (unsigned char *)calloc(VFILE_INC, 1);
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if (f->data == NULL)
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{
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free(f);
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return NULL;
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}
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f->filesize = 0;
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f->maxsize = VFILE_INC;
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}
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else
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{
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fseek(pf, 0, SEEK_END);
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f->filesize = ftell(pf);
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fseek(pf, 0, SEEK_SET);
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f->data = (unsigned char *)calloc(f->filesize, 1);
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if (f->data == NULL)
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{
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free(f);
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return NULL;
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}
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f->maxsize = f->filesize;
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fread(f->data, f->filesize, 1, pf);
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fclose(pf);
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}
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}
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if (f->mode & VFS_SEEKEOF)
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f->ptr = f->filesize;
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f->filename = strdup(fl);
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return f;
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}
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//----------------------------------------------------------------------------
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void Vfclose(VFILE *f)
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{
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if (!f) return;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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free(f->filename);
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if (f->rfile)
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fclose(f->rfile);
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f->rfile=0;
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// free(f);
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return;
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}
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#endif
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if (!(f->mode & VFS_WRITE))
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{
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free(f->filename);
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free(f->data);
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//free(f);
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return;
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}
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Vsync(f);
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while (f->locks)
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Vfunlock(f, 1);
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free(f->filename);
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free(f->data);
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//free(f);
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}
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//----------------------------------------------------------------------------
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size_t Vfread(void *ptr, size_t size, VFILE *f)
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{
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if (!ptr || !f) return 0;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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return fread(ptr, 1, size, f->rfile);
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}
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#endif
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size_t s = size;
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if (!s) return 0;
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if (s + f->ptr > f->filesize)
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{
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//FUCKO: remove this
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if (!(f->ptr < f->filesize))
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{
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// if (!f->flushtable) // this would be ideal, if we could figure out f->flushtable
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// f->flushtable=MessageBox(g_hwnd,"DB read failed, DB may be corrupted.\r\n\r\n"
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// "Hit Retry to continue, or Cancel to clear the DB and start over","Winamp Library Error",MB_RETRYCANCEL) == IDCANCEL; //fucko
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//MessageBox(g_hwnd,"DB read failed, DB may be corrupted. If this error persists, remove all files from the library.",
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// "Winamp Library Error",MB_OK);
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return 0;
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}
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s = f->filesize - f->ptr;
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}
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memcpy(ptr, f->data+f->ptr, s);
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f->ptr += s;
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return (s/size);
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}
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//----------------------------------------------------------------------------
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void Vfwrite(const void *ptr, size_t size, VFILE *f)
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{
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if (!ptr || !f) return;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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fwrite(ptr, size*n, f->rfile);
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return;
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}
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#endif
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f->dirty=1;
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if (size + f->ptr > f->maxsize)
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{
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// grow f->data,f->maxsize to be (size + f->ptr + VFILE_INC-1)&~(VFILE_INC-1)
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// instead of calling Vgrow again which gets kinda slow
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size_t newsize=(size + f->ptr + VFILE_INC-1)&~(VFILE_INC-1);
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f->data=(unsigned char *)realloc(f->data,newsize);
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if (f->data == NULL) return;
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memset(f->data+f->maxsize,0,newsize-f->maxsize);
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f->maxsize=newsize;
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}
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memcpy(f->data + f->ptr, ptr, size);
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f->ptr += size;
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if (f->ptr > f->filesize)
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f->filesize = f->ptr;
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}
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//----------------------------------------------------------------------------
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void Vgrow(VFILE *f)
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{
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if (!f) return;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached) return;
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#endif
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f->data = (unsigned char *)realloc(f->data, f->maxsize + VFILE_INC);
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f->maxsize += VFILE_INC;
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}
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//----------------------------------------------------------------------------
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void Vfputs(char *str, VFILE *f)
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{
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if (!f) return;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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fputs(str, f->rfile);
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return;
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}
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#endif
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Vfwrite(str, strlen(str), f);
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}
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//----------------------------------------------------------------------------
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void Vfputc(char c, VFILE *f)
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{
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if (!f) return;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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fputc(c, f->rfile);
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return;
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}
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#endif
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Vfwrite(&c, 1, f);
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}
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/* benski> unused:
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// not mac compliant
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//----------------------------------------------------------------------------
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char *Vfgets(char *dest, int n, VFILE *f) {
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if (!f) return NULL;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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#ifdef NDE_NOWIN32FILEIO
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return fgets(dest, n, f->rfile);
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#else
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#error port me!
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#endif
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}
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#endif
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unsigned char c=0;
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char *p;
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int l=0;
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p = dest;
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while (l < n && !Vfeof(f)) {
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c = f->data[f->ptr];
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f->ptr++;
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*p = c;
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p++;
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l++;
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if (c == '\n') {
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if (!Vfeof(f) && f->data[f->ptr] == '\r') {
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f->ptr++;
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}
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break;
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}
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}
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*p=0;
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return dest;
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}
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*/
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/* benski> unused:
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//----------------------------------------------------------------------------
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char Vfgetc(VFILE *f) {
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if (!f) return EOF;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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#ifdef NDE_NOWIN32FILEIO
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return fgetc(f->rfile);
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#else
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#error port me#
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#endif
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#endif
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if (!Vfeof(f))
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return f->data[f->ptr++];
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return EOF;
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}
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*/
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//----------------------------------------------------------------------------
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unsigned long Vftell(VFILE *f)
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{
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if (!f) return (unsigned)-1;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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return ftell(f->rfile);
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}
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#endif
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return f->ptr;
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}
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//----------------------------------------------------------------------------
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void Vfseek(VFILE *f, long i, int whence)
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{
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if (!f) return;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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fseek(f->rfile, i, whence);
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return;
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}
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#endif
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switch (whence)
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{
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case SEEK_SET:
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f->ptr = i;
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break;
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case SEEK_CUR:
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f->ptr += i;
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break;
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case SEEK_END:
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f->ptr = f->filesize+i;
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break;
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}
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}
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//----------------------------------------------------------------------------
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int Vfeof(VFILE *f)
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{
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if (!f) return -1;
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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return feof(f->rfile);
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}
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#endif
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return (f->ptr >= f->filesize);
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}
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//----------------------------------------------------------------------------
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int Vsync(VFILE *f)
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{
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if (!f) return 0;
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if (!f->dirty) return 0;
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if (f->mode & VFS_WRITE)
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{
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#ifdef NDE_ALLOW_NONCACHED
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if (!f->cached)
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{
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int p=ftell(f->rfile);
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fclose(f->rfile);
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f->rfile = fopen(f->filename, "r+b");
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if (!f->rfile)
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return 1;
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fseek(f->rfile, p, SEEK_SET);
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return 0;
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}
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#endif
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char newfn[1024], oldfn[1024];
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DWORD mypid=getpid();
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|
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snprintf(newfn,sizeof(newfn), "%s.n3w%08X",f->filename,mypid);
|
||
|
|
snprintf(oldfn,sizeof(oldfn), "%s.o1d%08X",f->filename,mypid);
|
||
|
|
|
||
|
|
unlink(newfn);
|
||
|
|
unlink(oldfn);
|
||
|
|
|
||
|
|
|
||
|
|
tryagain:
|
||
|
|
FILE *pf = fopen(newfn, "wb");
|
||
|
|
if (!pf || fwrite(f->data, f->filesize, 1, pf) != 1)
|
||
|
|
{
|
||
|
|
if (pf) fclose(pf);
|
||
|
|
|
||
|
|
|
||
|
|
printf("Error flushing DB to disk (is your drive full?)\n\nHit (R)etry to try again (recommended), or (C)ancel to abort (NOT recommended, and may leave the DB in an unuseable state)");
|
||
|
|
fflush(stdout);
|
||
|
|
char c;
|
||
|
|
while (1)
|
||
|
|
{
|
||
|
|
scanf("%c", &c);
|
||
|
|
// clear_stdin();
|
||
|
|
c = toupper(c);
|
||
|
|
if (c == 'R') goto tryagain;
|
||
|
|
else if (c == 'C') break;
|
||
|
|
}
|
||
|
|
unlink(newfn);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
fclose(pf);
|
||
|
|
rename(f->filename,oldfn); // save old file
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
int rv=0;
|
||
|
|
|
||
|
|
tryagain2:
|
||
|
|
if (rename(newfn,f->filename))
|
||
|
|
{
|
||
|
|
|
||
|
|
printf("Error updating DB file on disk. This should never really happen\n\nHit (R)etry to try again (recommended), or (C)ancel to abort (NOT recommended, and may leave the DB in an unuseable state)");
|
||
|
|
fflush(stdout);
|
||
|
|
char c;
|
||
|
|
while (1)
|
||
|
|
{
|
||
|
|
scanf("%c", &c);
|
||
|
|
// clear_stdin();
|
||
|
|
c = toupper(c);
|
||
|
|
if (c == 'R') goto tryagain2;
|
||
|
|
else if (c == 'C') break;
|
||
|
|
}
|
||
|
|
|
||
|
|
rename(oldfn,f->filename); // restore old file
|
||
|
|
rv=1;
|
||
|
|
}
|
||
|
|
|
||
|
|
// clean up our temp files
|
||
|
|
unlink(oldfn);
|
||
|
|
unlink(newfn);
|
||
|
|
|
||
|
|
|
||
|
|
//free(newfn);
|
||
|
|
//free(oldfn);
|
||
|
|
return rv;
|
||
|
|
}
|
||
|
|
f->dirty=0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void Vfdestroy(VFILE *f)
|
||
|
|
{
|
||
|
|
// benski> TODO:
|
||
|
|
if (f)
|
||
|
|
{
|
||
|
|
Vfclose(f);
|
||
|
|
|
||
|
|
while (f->locks)
|
||
|
|
Vfunlock(f, 1);
|
||
|
|
|
||
|
|
// TODO if (f->mutex) CloseHandle(f->mutex);
|
||
|
|
free(f);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// benski> TODO implement these with fopen
|
||
|
|
|
||
|
|
// returns 0 on failure
|
||
|
|
int Vflock(VFILE *fl, bool is_sync)
|
||
|
|
{
|
||
|
|
#ifndef NO_TABLE_WIN32_LOCKING
|
||
|
|
if (!fl) return 0;
|
||
|
|
if (!is_sync && fl->cached)
|
||
|
|
return 1;
|
||
|
|
if (fl->locks++ == 0)
|
||
|
|
{
|
||
|
|
int retry_cnt=0;
|
||
|
|
FILE *fFile;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
fFile = fopen(fl->lockname, "wb");
|
||
|
|
if (fFile == 0) Sleep(100);
|
||
|
|
}
|
||
|
|
while (fFile == 0 && retry_cnt++ < 100); // try for 10 seconds
|
||
|
|
|
||
|
|
if (fFile == INVALID_HANDLE_VALUE) return 0; // db already locked, fail gracefully
|
||
|
|
fl->lockFile = fFile;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
void Vfunlock(VFILE *fl, bool is_sync)
|
||
|
|
{
|
||
|
|
#ifndef NO_TABLE_WIN32_LOCKING
|
||
|
|
if (!is_sync && fl->cached)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (--fl->locks == 0)
|
||
|
|
{
|
||
|
|
if (fl && fl->lockFile && fl->lockFile != INVALID_HANDLE_VALUE)
|
||
|
|
{
|
||
|
|
fclose(fl->lockFile);
|
||
|
|
unlink(fl->lockname);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|