Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/C/7zStream.c

-/* 7zStream.c -- 7z Stream functions
-2008-11-23 : Igor Pavlov : Public domain */
-
-#include <string.h>
-
-#include "Types.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)
-{
-  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, 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, 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;
-}