Second attempt to update lzma_sdk to 9.20

third_party/lzma_sdk/7zStream.c

+/* 7zStream.c -- 7z Stream functions
+2010-03-11 : 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)
+{
+  const 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, const 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, const 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;
+}