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/* 7zStream.c -- 7z Stream functions↩
2017-04-03 : Igor Pavlov : Public domain */↩
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#include "Precomp.h"↩
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#include <string.h>↩
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#include "7zTypes.h"↩
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SRes SeqInStream_Read2(const ISeqInStream *stream, void *buf, size_t size, SRes errorType)↩
{↩
while (size != 0)↩
{↩
size_t processed = size;↩
RINOK(ISeqInStream_Read(stream, buf, &processed));↩
if (processed == 0)↩
return errorType;↩
buf = (void *)((Byte *)buf + processed);↩
size -= processed;↩
}↩
return SZ_OK;↩
}↩
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SRes SeqInStream_Read(const ISeqInStream *stream, void *buf, size_t size)↩
{↩
return SeqInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);↩
}↩
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SRes SeqInStream_ReadByte(const ISeqInStream *stream, Byte *buf)↩
{↩
size_t processed = 1;↩
RINOK(ISeqInStream_Read(stream, buf, &processed));↩
return (processed == 1) ? SZ_OK : SZ_ERROR_INPUT_EOF;↩
}↩
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SRes LookInStream_SeekTo(const ILookInStream *stream, UInt64 offset)↩
{↩
Int64 t = offset;↩
return ILookInStream_Seek(stream, &t, SZ_SEEK_SET);↩
}↩
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SRes LookInStream_LookRead(const ILookInStream *stream, void *buf, size_t *size)↩
{↩
const void *lookBuf;↩
if (*size == 0)↩
return SZ_OK;↩
RINOK(ILookInStream_Look(stream, &lookBuf, size));↩
memcpy(buf, lookBuf, *size);↩
return ILookInStream_Skip(stream, *size);↩
}↩
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SRes LookInStream_Read2(const ILookInStream *stream, void *buf, size_t size, SRes errorType)↩
{↩
while (size != 0)↩
{↩
size_t processed = size;↩
RINOK(ILookInStream_Read(stream, buf, &processed));↩
if (processed == 0)↩
return errorType;↩
buf = (void *)((Byte *)buf + processed);↩
size -= processed;↩
}↩
return SZ_OK;↩
}↩
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SRes LookInStream_Read(const ILookInStream *stream, void *buf, size_t size)↩
{↩
return LookInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);↩
}↩
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#define GET_LookToRead2 CLookToRead2 *p = CONTAINER_FROM_VTBL(pp, CLookToRead2, vt);↩
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static SRes LookToRead2_Look_Lookahead(const ILookInStream *pp, const void **buf, size_t *size)↩
{↩
SRes res = SZ_OK;↩
GET_LookToRead2↩
size_t size2 = p->size - p->pos;↩
if (size2 == 0 && *size != 0)↩
{↩
p->pos = 0;↩
p->size = 0;↩
size2 = p->bufSize;↩
res = ISeekInStream_Read(p->realStream, p->buf, &size2);↩
p->size = size2;↩
}↩
if (*size > size2)↩
*size = size2;↩
*buf = p->buf + p->pos;↩
return res;↩
}↩
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static SRes LookToRead2_Look_Exact(const ILookInStream *pp, const void **buf, size_t *size)↩
{↩
SRes res = SZ_OK;↩
GET_LookToRead2↩
size_t size2 = p->size - p->pos;↩
if (size2 == 0 && *size != 0)↩
{↩
p->pos = 0;↩
p->size = 0;↩
if (*size > p->bufSize)↩
*size = p->bufSize;↩
res = ISeekInStream_Read(p->realStream, p->buf, size);↩
size2 = p->size = *size;↩
}↩
if (*size > size2)↩
*size = size2;↩
*buf = p->buf + p->pos;↩
return res;↩
}↩
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static SRes LookToRead2_Skip(const ILookInStream *pp, size_t offset)↩
{↩
GET_LookToRead2↩
p->pos += offset;↩
return SZ_OK;↩
}↩
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static SRes LookToRead2_Read(const ILookInStream *pp, void *buf, size_t *size)↩
{↩
GET_LookToRead2↩
size_t rem = p->size - p->pos;↩
if (rem == 0)↩
return ISeekInStream_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;↩
}↩
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static SRes LookToRead2_Seek(const ILookInStream *pp, Int64 *pos, ESzSeek origin)↩
{↩
GET_LookToRead2↩
p->pos = p->size = 0;↩
return ISeekInStream_Seek(p->realStream, pos, origin);↩
}↩
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void LookToRead2_CreateVTable(CLookToRead2 *p, int lookahead)↩
{↩
p->vt.Look = lookahead ?↩
LookToRead2_Look_Lookahead :↩
LookToRead2_Look_Exact;↩
p->vt.Skip = LookToRead2_Skip;↩
p->vt.Read = LookToRead2_Read;↩
p->vt.Seek = LookToRead2_Seek;↩
}↩
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static SRes SecToLook_Read(const ISeqInStream *pp, void *buf, size_t *size)↩
{↩
CSecToLook *p = CONTAINER_FROM_VTBL(pp, CSecToLook, vt);↩
return LookInStream_LookRead(p->realStream, buf, size);↩
}↩
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void SecToLook_CreateVTable(CSecToLook *p)↩
{↩
p->vt.Read = SecToLook_Read;↩
}↩
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static SRes SecToRead_Read(const ISeqInStream *pp, void *buf, size_t *size)↩
{↩
CSecToRead *p = CONTAINER_FROM_VTBL(pp, CSecToRead, vt);↩
return ILookInStream_Read(p->realStream, buf, size);↩
}↩
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void SecToRead_CreateVTable(CSecToRead *p)↩
{↩
p->vt.Read = SecToRead_Read;↩
}↩