BaseTools Lzma: Update LZMA SDK version to 18.05

[mirror_edk2.git] / BaseTools / Source / C / LzmaCompress / Sdk / C / 7zStream.c

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