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Scan the xz file to determinate the number of blocks and streams, and its uncompressed size

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This commit is contained in:
Jukka Ojanen 2021-08-26 16:41:17 +03:00
parent 985252e283
commit 4dcdbebb2f
2 changed files with 73 additions and 19 deletions
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2
src/Makefile
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@ -375,7 +375,7 @@ LINUX_OBJS := $(foreach OBJ,$(OBJS_ALL),obj/$(OBJ).LINUX.o)
WIN_OBJS := $(foreach OBJ,$(OBJS_ALL),obj/$(OBJ).WIN.o)
ifeq ($(USE_SYSTEM_LZMA),0)
OBJS_LZMA := 7zCrc 7zCrcOpt 7zFile 7zStream Alloc Bra Bra86 BraIA64 CpuArch Delta LzmaDec Lzma2Dec Sha256 Sha256Opt Xz XzCrc64 XzCrc64Opt XzDec
OBJS_LZMA := 7zCrc 7zCrcOpt 7zFile 7zStream Alloc Bra Bra86 BraIA64 CpuArch Delta LzmaDec Lzma2Dec Sha256 Sha256Opt Xz XzCrc64 XzCrc64Opt XzDec XzIn
NATIVE_OBJS += $(foreach OBJ,$(OBJS_LZMA),obj/$(OBJ).LZMA.NATIVE.o)
LINUX_OBJS += $(foreach OBJ,$(OBJS_LZMA),obj/$(OBJ).LZMA.LINUX.o)

88
src/filehandling.c
View File

@ -31,14 +31,17 @@ static const ISzAlloc xz_alloc = { hc_lzma_alloc, hc_lzma_free };
struct xzfile
{
CAlignOffsetAlloc alloc;
UInt64 inBlocks;
Byte *inBuf;
bool inEof;
SizeT inLen;
SizeT inPos;
Int64 inProcessed;
CFileSeqInStream inStream;
CFileInStream inStream;
Int64 outProcessed;
UInt64 outSize;
CXzUnpacker state;
CXzs streams;
};
#if defined (__CYGWIN__)
@ -177,9 +180,9 @@ bool hc_fopen (HCFILE *fp, const char *path, const char *mode)
return false;
}
/* open file */
CFileSeqInStream *inStream = &xfp->inStream;
FileSeqInStream_CreateVTable (inStream);
/* open the file */
CFileInStream *inStream = &xfp->inStream;
FileInStream_CreateVTable (inStream);
CSzFile *file = &inStream->file;
File_Construct (file);
WRes wres = InFile_Open (file, path);
@ -191,11 +194,39 @@ bool hc_fopen (HCFILE *fp, const char *path, const char *mode)
return false;
}
/* fill buffer */
/* scan the file */
CLookToRead2 lookStream;
LookToRead2_CreateVTable (&lookStream, false);
lookStream.buf = xfp->inBuf;
lookStream.bufSize = XZFILE_BUFFER_SIZE;
lookStream.realStream = &inStream->vt;
LookToRead2_Init (&lookStream);
Xzs_Construct (&xfp->streams);
Int64 offset = 0;
SRes res = Xzs_ReadBackward (&xfp->streams, &lookStream.vt, &offset, NULL, alloc);
if (res != SZ_OK || offset != 0)
{
Xzs_Free (&xfp->streams, alloc);
File_Close (file);
ISzAlloc_Free (alloc, xfp->inBuf);
hcfree (xfp);
close (fp->fd);
return false;
}
xfp->inBlocks = Xzs_GetNumBlocks (&xfp->streams);
xfp->outSize = Xzs_GetUnpackSize (&xfp->streams);
/* seek to start of the file and fill the buffer */
SizeT inLen = XZFILE_BUFFER_SIZE;
SRes res = ISeqInStream_Read (&inStream->vt, xfp->inBuf, &inLen);
res = ISeekInStream_Seek (&inStream->vt, &offset, SZ_SEEK_SET);
if (res == SZ_OK)
{
res = ISeekInStream_Read (&inStream->vt, xfp->inBuf, &inLen);
}
if (res != SZ_OK || inLen == 0)
{
Xzs_Free (&xfp->streams, alloc);
File_Close (file);
ISzAlloc_Free (alloc, xfp->inBuf);
hcfree (xfp);
@ -214,6 +245,7 @@ bool hc_fopen (HCFILE *fp, const char *path, const char *mode)
if (res != SZ_OK)
{
XzUnpacker_Free (state);
Xzs_Free (&xfp->streams, alloc);
File_Close (file);
ISzAlloc_Free (alloc, xfp->inBuf);
hcfree (xfp);
@ -390,7 +422,7 @@ size_t hc_fread (void *ptr, size_t size, size_t nmemb, HCFILE *fp)
{
xfp->inPos = 0;
xfp->inLen = XZFILE_BUFFER_SIZE;
res = ISeqInStream_Read (&xfp->inStream.vt, xfp->inBuf, &xfp->inLen);
res = ISeekInStream_Read (&xfp->inStream.vt, xfp->inBuf, &xfp->inLen);
if (res != SZ_OK || xfp->inLen == 0) xfp->inEof = true;
}
@ -542,15 +574,16 @@ void hc_rewind (HCFILE *fp)
xfp->outProcessed = 0;
/* reset */
Int64 begin = 0;
CFileSeqInStream *inStream = &xfp->inStream;
File_Seek (&inStream->file, &begin, SZ_SEEK_SET);
Int64 offset = 0;
CFileInStream *inStream = &xfp->inStream;
SRes res = ISeekInStream_Seek (&inStream->vt, &offset, SZ_SEEK_SET);
if (res != SZ_OK) return;
CXzUnpacker *state = &xfp->state;
XzUnpacker_Init (&xfp->state);
/* fill buffer */
/* fill the buffer */
SizeT inLen = XZFILE_BUFFER_SIZE;
SRes res = ISeqInStream_Read (&inStream->vt, xfp->inBuf, &inLen);
res = ISeekInStream_Read (&inStream->vt, xfp->inBuf, &inLen);
if (res != SZ_OK || inLen == 0) return;
xfp->inLen = inLen;
@ -566,10 +599,29 @@ void hc_rewind (HCFILE *fp)
int hc_fstat (HCFILE *fp, struct stat *buf)
{
if (fp == NULL || buf == NULL || fp->fd == -1) return -1;
int r = -1;
if (fp == NULL || buf == NULL || fp->fd == -1) return r;
r = fstat (fp->fd, buf);
if (r != 0) return r;
if (fp->gfp)
{
/* TODO: For compressed files hc_ftell() reports uncompressed bytes, but hc_fstat() reports compressed bytes */
return fstat (fp->fd, buf);
}
else if (fp->ufp)
{
/* TODO: For compressed files hc_ftell() reports uncompressed bytes, but hc_fstat() reports compressed bytes */
}
else if (fp->xfp)
{
/* uncompressed bytes */
const xzfile_t *xfp = fp->xfp;
buf->st_size = (off_t) xfp->outSize;
}
return r;
}
off_t hc_ftell (HCFILE *fp)
@ -649,7 +701,7 @@ int hc_fgetc (HCFILE *fp)
{
xfp->inPos = 0;
xfp->inLen = XZFILE_BUFFER_SIZE;
res = ISeqInStream_Read (&xfp->inStream.vt, xfp->inBuf, &xfp->inLen);
res = ISeekInStream_Read (&xfp->inStream.vt, xfp->inBuf, &xfp->inLen);
if (res != SZ_OK || xfp->inLen == 0) xfp->inEof = true;
}
@ -701,7 +753,7 @@ char *hc_fgets (char *buf, int len, HCFILE *fp)
{
xfp->inPos = 0;
xfp->inLen = XZFILE_BUFFER_SIZE;
res = ISeqInStream_Read (&xfp->inStream.vt, xfp->inBuf, &xfp->inLen);
res = ISeekInStream_Read (&xfp->inStream.vt, xfp->inBuf, &xfp->inLen);
if (res != SZ_OK || xfp->inLen == 0) xfp->inEof = true;
}
@ -872,9 +924,11 @@ void hc_fclose (HCFILE *fp)
else if (fp->xfp)
{
xzfile_t *xfp = fp->xfp;
ISzAllocPtr alloc = &xfp->alloc.vt;
XzUnpacker_Free (&xfp->state);
Xzs_Free (&xfp->streams, alloc);
File_Close (&xfp->inStream.file);
ISzAlloc_Free (&xfp->alloc.vt, xfp->inBuf);
ISzAlloc_Free (alloc, xfp->inBuf);
hcfree (xfp);
close (fp->fd);
}