Merge pull request #511 from negativeExponent/updates

[pcsx_rearmed.git] / deps / lzma-16.04 / C / 7zStream.c

/* 7zStream.c -- 7z Stream functions\r
2013-11-12 : 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(ISeqInStream *stream, void *buf, size_t size, SRes errorType)\r
{\r
  while (size != 0)\r
  {\r
    size_t processed = size;\r
    RINOK(stream->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(ISeqInStream *stream, void *buf, size_t size)\r
{\r
  return SeqInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);\r
}\r
\r
SRes SeqInStream_ReadByte(ISeqInStream *stream, Byte *buf)\r
{\r
  size_t processed = 1;\r
  RINOK(stream->Read(stream, buf, &processed));\r
  return (processed == 1) ? SZ_OK : SZ_ERROR_INPUT_EOF;\r
}\r
\r
SRes LookInStream_SeekTo(ILookInStream *stream, UInt64 offset)\r
{\r
  Int64 t = offset;\r
  return stream->Seek(stream, &t, SZ_SEEK_SET);\r
}\r
\r
SRes LookInStream_LookRead(ILookInStream *stream, void *buf, size_t *size)\r
{\r
  const void *lookBuf;\r
  if (*size == 0)\r
    return SZ_OK;\r
  RINOK(stream->Look(stream, &lookBuf, size));\r
  memcpy(buf, lookBuf, *size);\r
  return stream->Skip(stream, *size);\r
}\r
\r
SRes LookInStream_Read2(ILookInStream *stream, void *buf, size_t size, SRes errorType)\r
{\r
  while (size != 0)\r
  {\r
    size_t processed = size;\r
    RINOK(stream->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 LookInStream_Read(ILookInStream *stream, void *buf, size_t size)\r
{\r
  return LookInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);\r
}\r
\r
static SRes LookToRead_Look_Lookahead(void *pp, const void **buf, size_t *size)\r
{\r
  SRes res = SZ_OK;\r
  CLookToRead *p = (CLookToRead *)pp;\r
  size_t size2 = p->size - p->pos;\r
  if (size2 == 0 && *size > 0)\r
  {\r
    p->pos = 0;\r
    size2 = LookToRead_BUF_SIZE;\r
    res = p->realStream->Read(p->realStream, p->buf, &size2);\r
    p->size = size2;\r
  }\r
  if (size2 < *size)\r
    *size = size2;\r
  *buf = p->buf + p->pos;\r
  return res;\r
}\r
\r
static SRes LookToRead_Look_Exact(void *pp, const void **buf, size_t *size)\r
{\r
  SRes res = SZ_OK;\r
  CLookToRead *p = (CLookToRead *)pp;\r
  size_t size2 = p->size - p->pos;\r
  if (size2 == 0 && *size > 0)\r
  {\r
    p->pos = 0;\r
    if (*size > LookToRead_BUF_SIZE)\r
      *size = LookToRead_BUF_SIZE;\r
    res = p->realStream->Read(p->realStream, p->buf, size);\r
    size2 = p->size = *size;\r
  }\r
  if (size2 < *size)\r
    *size = size2;\r
  *buf = p->buf + p->pos;\r
  return res;\r
}\r
\r
static SRes LookToRead_Skip(void *pp, size_t offset)\r
{\r
  CLookToRead *p = (CLookToRead *)pp;\r
  p->pos += offset;\r
  return SZ_OK;\r
}\r
\r
static SRes LookToRead_Read(void *pp, void *buf, size_t *size)\r
{\r
  CLookToRead *p = (CLookToRead *)pp;\r
  size_t rem = p->size - p->pos;\r
  if (rem == 0)\r
    return p->realStream->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 LookToRead_Seek(void *pp, Int64 *pos, ESzSeek origin)\r
{\r
  CLookToRead *p = (CLookToRead *)pp;\r
  p->pos = p->size = 0;\r
  return p->realStream->Seek(p->realStream, pos, origin);\r
}\r
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void LookToRead_CreateVTable(CLookToRead *p, int lookahead)\r
{\r
  p->s.Look = lookahead ?\r
      LookToRead_Look_Lookahead :\r
      LookToRead_Look_Exact;\r
  p->s.Skip = LookToRead_Skip;\r
  p->s.Read = LookToRead_Read;\r
  p->s.Seek = LookToRead_Seek;\r
}\r
\r
void LookToRead_Init(CLookToRead *p)\r
{\r
  p->pos = p->size = 0;\r
}\r
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static SRes SecToLook_Read(void *pp, void *buf, size_t *size)\r
{\r
  CSecToLook *p = (CSecToLook *)pp;\r
  return LookInStream_LookRead(p->realStream, buf, size);\r
}\r
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void SecToLook_CreateVTable(CSecToLook *p)\r
{\r
  p->s.Read = SecToLook_Read;\r
}\r
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static SRes SecToRead_Read(void *pp, void *buf, size_t *size)\r
{\r
  CSecToRead *p = (CSecToRead *)pp;\r
  return p->realStream->Read(p->realStream, buf, size);\r
}\r
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void SecToRead_CreateVTable(CSecToRead *p)\r
{\r
  p->s.Read = SecToRead_Read;\r
}\r