You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
172 lines
3.9 KiB
172 lines
3.9 KiB
![]()
4 years ago
|
/* 7zStream.c -- 7z Stream functions
|
||
|
2013-11-12 : Igor Pavlov : Public domain */
|
||
|
|
||
|
#include "Precomp.h"
|
||
|
|
||
|
#include <string.h>
|
||
|
|
||
|
#include "7zTypes.h"
|
||
|
|
||
|
SRes SeqInStream_Read2(ISeqInStream *stream, void *buf, size_t size, SRes errorType)
|
||
|
{
|
||
|
while (size != 0)
|
||
|
{
|
||
|
size_t processed = size;
|
||
|
RINOK(stream->Read(stream, buf, &processed));
|
||
|
if (processed == 0)
|
||
|
return errorType;
|
||
|
buf = (void *)((Byte *)buf + processed);
|
||
|
size -= processed;
|
||
|
}
|
||
|
return SZ_OK;
|
||
|
}
|
||
|
|
||
|
SRes SeqInStream_Read(ISeqInStream *stream, void *buf, size_t size)
|
||
|
{
|
||
|
return SeqInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);
|
||
|
}
|
||
|
|
||
|
SRes SeqInStream_ReadByte(ISeqInStream *stream, Byte *buf)
|
||
|
{
|
||
|
size_t processed = 1;
|
||
|
RINOK(stream->Read(stream, buf, &processed));
|
||
|
return (processed == 1) ? SZ_OK : SZ_ERROR_INPUT_EOF;
|
||
|
}
|
||
|
|
||
|
SRes LookInStream_SeekTo(ILookInStream *stream, UInt64 offset)
|
||
|
{
|
||
|
Int64 t = offset;
|
||
|
return stream->Seek(stream, &t, SZ_SEEK_SET);
|
||
|
}
|
||
|
|
||
|
SRes LookInStream_LookRead(ILookInStream *stream, void *buf, size_t *size)
|
||
|
{
|
||
|
const void *lookBuf;
|
||
|
if (*size == 0)
|
||
|
return SZ_OK;
|
||
|
RINOK(stream->Look(stream, &lookBuf, size));
|
||
|
memcpy(buf, lookBuf, *size);
|
||
|
return stream->Skip(stream, *size);
|
||
|
}
|
||
|
|
||
|
SRes LookInStream_Read2(ILookInStream *stream, void *buf, size_t size, SRes errorType)
|
||
|
{
|
||
|
while (size != 0)
|
||
|
{
|
||
|
size_t processed = size;
|
||
|
RINOK(stream->Read(stream, buf, &processed));
|
||
|
if (processed == 0)
|
||
|
return errorType;
|
||
|
buf = (void *)((Byte *)buf + processed);
|
||
|
size -= processed;
|
||
|
}
|
||
|
return SZ_OK;
|
||
|
}
|
||
|
|
||
|
SRes LookInStream_Read(ILookInStream *stream, void *buf, size_t size)
|
||
|
{
|
||
|
return LookInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);
|
||
|
}
|
||
|
|
||
|
static SRes LookToRead_Look_Lookahead(void *pp, const void **buf, size_t *size)
|
||
|
{
|
||
|
SRes res = SZ_OK;
|
||
|
CLookToRead *p = (CLookToRead *)pp;
|
||
|
size_t size2 = p->size - p->pos;
|
||
|
if (size2 == 0 && *size > 0)
|
||
|
{
|
||
|
p->pos = 0;
|
||
|
size2 = LookToRead_BUF_SIZE;
|
||
|
res = p->realStream->Read(p->realStream, p->buf, &size2);
|
||
|
p->size = size2;
|
||
|
}
|
||
|
if (size2 < *size)
|
||
|
*size = size2;
|
||
|
*buf = p->buf + p->pos;
|
||
|
return res;
|
||
|
}
|
||
|
|
||
|
static SRes LookToRead_Look_Exact(void *pp, const void **buf, size_t *size)
|
||
|
{
|
||
|
SRes res = SZ_OK;
|
||
|
CLookToRead *p = (CLookToRead *)pp;
|
||
|
size_t size2 = p->size - p->pos;
|
||
|
if (size2 == 0 && *size > 0)
|
||
|
{
|
||
|
p->pos = 0;
|
||
|
if (*size > LookToRead_BUF_SIZE)
|
||
|
*size = LookToRead_BUF_SIZE;
|
||
|
res = p->realStream->Read(p->realStream, p->buf, size);
|
||
|
size2 = p->size = *size;
|
||
|
}
|
||
|
if (size2 < *size)
|
||
|
*size = size2;
|
||
|
*buf = p->buf + p->pos;
|
||
|
return res;
|
||
|
}
|
||
|
|
||
|
static SRes LookToRead_Skip(void *pp, size_t offset)
|
||
|
{
|
||
|
CLookToRead *p = (CLookToRead *)pp;
|
||
|
p->pos += offset;
|
||
|
return SZ_OK;
|
||
|
}
|
||
|
|
||
|
static SRes LookToRead_Read(void *pp, void *buf, size_t *size)
|
||
|
{
|
||
|
CLookToRead *p = (CLookToRead *)pp;
|
||
|
size_t rem = p->size - p->pos;
|
||
|
if (rem == 0)
|
||
|
return p->realStream->Read(p->realStream, buf, size);
|
||
|
if (rem > *size)
|
||
|
rem = *size;
|
||
|
memcpy(buf, p->buf + p->pos, rem);
|
||
|
p->pos += rem;
|
||
|
*size = rem;
|
||
|
return SZ_OK;
|
||
|
}
|
||
|
|
||
|
static SRes LookToRead_Seek(void *pp, Int64 *pos, ESzSeek origin)
|
||
|
{
|
||
|
CLookToRead *p = (CLookToRead *)pp;
|
||
|
p->pos = p->size = 0;
|
||
|
return p->realStream->Seek(p->realStream, pos, origin);
|
||
|
}
|
||
|
|
||
|
void LookToRead_CreateVTable(CLookToRead *p, int lookahead)
|
||
|
{
|
||
|
p->s.Look = lookahead ?
|
||
|
LookToRead_Look_Lookahead :
|
||
|
LookToRead_Look_Exact;
|
||
|
p->s.Skip = LookToRead_Skip;
|
||
|
p->s.Read = LookToRead_Read;
|
||
|
p->s.Seek = LookToRead_Seek;
|
||
|
}
|
||
|
|
||
|
void LookToRead_Init(CLookToRead *p)
|
||
|
{
|
||
|
p->pos = p->size = 0;
|
||
|
}
|
||
|
|
||
|
static SRes SecToLook_Read(void *pp, void *buf, size_t *size)
|
||
|
{
|
||
|
CSecToLook *p = (CSecToLook *)pp;
|
||
|
return LookInStream_LookRead(p->realStream, buf, size);
|
||
|
}
|
||
|
|
||
|
void SecToLook_CreateVTable(CSecToLook *p)
|
||
|
{
|
||
|
p->s.Read = SecToLook_Read;
|
||
|
}
|
||
|
|
||
|
static SRes SecToRead_Read(void *pp, void *buf, size_t *size)
|
||
|
{
|
||
|
CSecToRead *p = (CSecToRead *)pp;
|
||
|
return p->realStream->Read(p->realStream, buf, size);
|
||
|
}
|
||
|
|
||
|
void SecToRead_CreateVTable(CSecToRead *p)
|
||
|
{
|
||
|
p->s.Read = SecToRead_Read;
|
||
|
}
|