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117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
#include <io_internal.h>
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#include <iob.h>
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#include <unistd.h>
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#include <sys/types.h>
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#ifdef __MINGW32__
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#endif
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#include <errno.h>
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#define BUFSIZE 16384
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int64 io_mmapwritefile(int64 out,int64 in,uint64 off,uint64 bytes,io_write_callback writecb) {
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char buf[BUFSIZE];
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int n,m;
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uint64 sent=0;
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io_entry* e=array_get(&io_fds,sizeof(io_entry),out);
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if (e) {
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const char* c;
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unsigned long left;
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#ifdef __MINGW32__
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if (!e->mh) e->mh=CreateFileMapping(out,0,PAGE_READONLY,0,0,NULL);
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if (!e->mh) goto readwrite;
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#endif
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do {
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if (e->mmapped) {
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/* did we already map the right chunk? */
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if (off>=e->mapofs && off<e->mapofs+e->maplen)
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goto mapok; /* ok; mmapped the right chunk*/
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#ifdef __MINGW32__
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UnmapViewOfFile(e->mmapped);
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#else
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munmap(e->mmapped,e->maplen);
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#endif
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}
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e->mapofs=off&0xffffffffffff0000ull;
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if (e->mapofs+0x10000>off+bytes)
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e->maplen=off+bytes-e->mapofs;
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else
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e->maplen=0x10000;
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#ifdef __MINGW32__
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if ((e->mmapped=MapViewOfFile(e->mh,FILE_MAP_READ,(DWORD)(e->mapofs>>32),
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(DWORD)e->mapofs,e->maplen))==0)
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#else
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if ((e->mmapped=mmap(0,e->maplen,PROT_READ,MAP_SHARED,in,e->mapofs))==MAP_FAILED)
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#endif
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{
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e->mmapped=0;
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goto readwrite;
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}
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mapok:
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c=(const char*)(e->mmapped)+(off&0xffff);
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left=e->maplen-(off&0xffff);
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if (left>bytes) left=bytes;
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while (left>0) {
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m=writecb(out,c,left);
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if (m==-1) {
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e->canwrite=0;
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e->next_write=-1;
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if (errno!=EAGAIN) {
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#ifdef __MINGW32__
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UnmapViewOfFile(e->mmapped);
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#else
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munmap(e->mmapped,e->maplen);
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#endif
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e->mmapped=0;
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return -3;
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}
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return sent?(int64)sent:-1;
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}
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if (m==0) return sent;
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sent+=m;
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left-=m;
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bytes-=m;
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off+=m;
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c+=m;
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}
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} while (bytes);
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if (e->mmapped) {
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#ifdef __MINGW32__
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UnmapViewOfFile(e->mmapped);
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#else
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munmap(e->mmapped,e->maplen);
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#endif
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e->mmapped=0;
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}
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return sent;
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}
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readwrite:
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if (lseek(in,off,SEEK_SET) != (off_t)off)
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return -1;
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while (bytes>0) {
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char* tmp=buf;
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if ((n=read(in,tmp,(bytes<BUFSIZE)?bytes:BUFSIZE))<=0)
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return (sent?(int64)sent:-1);
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while (n>0) {
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if ((m=writecb(out,tmp,n))<0) {
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if (m==-1) {
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if (e) {
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e->canwrite=0;
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e->next_write=-1;
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}
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return errno==EAGAIN?(sent?(int64)sent:-1):-3;
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}
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goto abort;
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}
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sent+=m;
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n-=m;
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bytes-=m;
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tmp+=m;
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}
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}
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abort:
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return sent;
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}
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