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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
176 lines
4.1 KiB
C
176 lines
4.1 KiB
C
/* 7zStream.c -- 7z Stream functions
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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)
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{
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while (size != 0)
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{
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size_t processed = size;
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RINOK(ISeqInStream_Read(stream, buf, &processed));
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if (processed == 0)
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return errorType;
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buf = (void *)((Byte *)buf + processed);
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size -= processed;
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}
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return SZ_OK;
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}
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SRes SeqInStream_Read(const ISeqInStream *stream, void *buf, size_t size)
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{
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return SeqInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);
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}
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SRes SeqInStream_ReadByte(const ISeqInStream *stream, Byte *buf)
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{
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size_t processed = 1;
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RINOK(ISeqInStream_Read(stream, buf, &processed));
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return (processed == 1) ? SZ_OK : SZ_ERROR_INPUT_EOF;
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}
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SRes LookInStream_SeekTo(const ILookInStream *stream, UInt64 offset)
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{
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Int64 t = offset;
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return ILookInStream_Seek(stream, &t, SZ_SEEK_SET);
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}
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SRes LookInStream_LookRead(const ILookInStream *stream, void *buf, size_t *size)
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{
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const void *lookBuf;
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if (*size == 0)
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return SZ_OK;
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RINOK(ILookInStream_Look(stream, &lookBuf, size));
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memcpy(buf, lookBuf, *size);
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return ILookInStream_Skip(stream, *size);
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}
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SRes LookInStream_Read2(const ILookInStream *stream, void *buf, size_t size, SRes errorType)
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{
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while (size != 0)
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{
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size_t processed = size;
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RINOK(ILookInStream_Read(stream, buf, &processed));
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if (processed == 0)
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return errorType;
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buf = (void *)((Byte *)buf + processed);
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size -= processed;
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}
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return SZ_OK;
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}
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SRes LookInStream_Read(const ILookInStream *stream, void *buf, size_t size)
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{
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return LookInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);
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}
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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)
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{
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SRes res = SZ_OK;
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GET_LookToRead2
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size_t size2 = p->size - p->pos;
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if (size2 == 0 && *size != 0)
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{
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p->pos = 0;
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p->size = 0;
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size2 = p->bufSize;
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res = ISeekInStream_Read(p->realStream, p->buf, &size2);
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p->size = size2;
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}
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if (*size > size2)
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*size = size2;
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*buf = p->buf + p->pos;
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return res;
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}
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static SRes LookToRead2_Look_Exact(const ILookInStream *pp, const void **buf, size_t *size)
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{
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SRes res = SZ_OK;
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GET_LookToRead2
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size_t size2 = p->size - p->pos;
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if (size2 == 0 && *size != 0)
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{
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p->pos = 0;
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p->size = 0;
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if (*size > p->bufSize)
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*size = p->bufSize;
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res = ISeekInStream_Read(p->realStream, p->buf, size);
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size2 = p->size = *size;
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}
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if (*size > size2)
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*size = size2;
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*buf = p->buf + p->pos;
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return res;
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}
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static SRes LookToRead2_Skip(const ILookInStream *pp, size_t offset)
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{
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GET_LookToRead2
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p->pos += offset;
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return SZ_OK;
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}
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static SRes LookToRead2_Read(const ILookInStream *pp, void *buf, size_t *size)
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{
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GET_LookToRead2
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size_t rem = p->size - p->pos;
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if (rem == 0)
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return ISeekInStream_Read(p->realStream, buf, size);
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if (rem > *size)
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rem = *size;
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memcpy(buf, p->buf + p->pos, rem);
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p->pos += rem;
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*size = rem;
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return SZ_OK;
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}
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static SRes LookToRead2_Seek(const ILookInStream *pp, Int64 *pos, ESzSeek origin)
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{
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GET_LookToRead2
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p->pos = p->size = 0;
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return ISeekInStream_Seek(p->realStream, pos, origin);
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}
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void LookToRead2_CreateVTable(CLookToRead2 *p, int lookahead)
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{
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p->vt.Look = lookahead ?
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LookToRead2_Look_Lookahead :
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LookToRead2_Look_Exact;
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p->vt.Skip = LookToRead2_Skip;
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p->vt.Read = LookToRead2_Read;
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p->vt.Seek = LookToRead2_Seek;
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}
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static SRes SecToLook_Read(const ISeqInStream *pp, void *buf, size_t *size)
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{
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CSecToLook *p = CONTAINER_FROM_VTBL(pp, CSecToLook, vt);
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return LookInStream_LookRead(p->realStream, buf, size);
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}
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void SecToLook_CreateVTable(CSecToLook *p)
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{
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p->vt.Read = SecToLook_Read;
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}
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static SRes SecToRead_Read(const ISeqInStream *pp, void *buf, size_t *size)
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{
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CSecToRead *p = CONTAINER_FROM_VTBL(pp, CSecToRead, vt);
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return ILookInStream_Read(p->realStream, buf, size);
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}
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void SecToRead_CreateVTable(CSecToRead *p)
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{
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p->vt.Read = SecToRead_Read;
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}
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