1 /* 7zStream.c -- 7z Stream functions
2 2010-03-11 : Igor Pavlov : Public domain */
8 SRes SeqInStream_Read2(ISeqInStream *stream, void *buf, size_t size, SRes errorType)
12 size_t processed = size;
13 RINOK(stream->Read(stream, buf, &processed));
16 buf = (void *)((Byte *)buf + processed);
22 SRes SeqInStream_Read(ISeqInStream *stream, void *buf, size_t size)
24 return SeqInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);
27 SRes SeqInStream_ReadByte(ISeqInStream *stream, Byte *buf)
30 RINOK(stream->Read(stream, buf, &processed));
31 return (processed == 1) ? SZ_OK : SZ_ERROR_INPUT_EOF;
34 SRes LookInStream_SeekTo(ILookInStream *stream, UInt64 offset)
37 return stream->Seek(stream, &t, SZ_SEEK_SET);
40 SRes LookInStream_LookRead(ILookInStream *stream, void *buf, size_t *size)
45 RINOK(stream->Look(stream, &lookBuf, size));
46 memcpy(buf, lookBuf, *size);
47 return stream->Skip(stream, *size);
50 SRes LookInStream_Read2(ILookInStream *stream, void *buf, size_t size, SRes errorType)
54 size_t processed = size;
55 RINOK(stream->Read(stream, buf, &processed));
58 buf = (void *)((Byte *)buf + processed);
64 SRes LookInStream_Read(ILookInStream *stream, void *buf, size_t size)
66 return LookInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF);
69 static SRes LookToRead_Look_Lookahead(void *pp, const void **buf, size_t *size)
72 CLookToRead *p = (CLookToRead *)pp;
73 size_t size2 = p->size - p->pos;
74 if (size2 == 0 && *size > 0)
77 size2 = LookToRead_BUF_SIZE;
78 res = p->realStream->Read(p->realStream, p->buf, &size2);
83 *buf = p->buf + p->pos;
87 static SRes LookToRead_Look_Exact(void *pp, const void **buf, size_t *size)
90 CLookToRead *p = (CLookToRead *)pp;
91 size_t size2 = p->size - p->pos;
92 if (size2 == 0 && *size > 0)
95 if (*size > LookToRead_BUF_SIZE)
96 *size = LookToRead_BUF_SIZE;
97 res = p->realStream->Read(p->realStream, p->buf, size);
98 size2 = p->size = *size;
102 *buf = p->buf + p->pos;
106 static SRes LookToRead_Skip(void *pp, size_t offset)
108 CLookToRead *p = (CLookToRead *)pp;
113 static SRes LookToRead_Read(void *pp, void *buf, size_t *size)
115 CLookToRead *p = (CLookToRead *)pp;
116 size_t rem = p->size - p->pos;
118 return p->realStream->Read(p->realStream, buf, size);
121 memcpy(buf, p->buf + p->pos, rem);
127 static SRes LookToRead_Seek(void *pp, Int64 *pos, ESzSeek origin)
129 CLookToRead *p = (CLookToRead *)pp;
130 p->pos = p->size = 0;
131 return p->realStream->Seek(p->realStream, pos, origin);
134 void LookToRead_CreateVTable(CLookToRead *p, int lookahead)
136 p->s.Look = lookahead ?
137 LookToRead_Look_Lookahead :
138 LookToRead_Look_Exact;
139 p->s.Skip = LookToRead_Skip;
140 p->s.Read = LookToRead_Read;
141 p->s.Seek = LookToRead_Seek;
144 void LookToRead_Init(CLookToRead *p)
146 p->pos = p->size = 0;
149 static SRes SecToLook_Read(void *pp, void *buf, size_t *size)
151 CSecToLook *p = (CSecToLook *)pp;
152 return LookInStream_LookRead(p->realStream, buf, size);
155 void SecToLook_CreateVTable(CSecToLook *p)
157 p->s.Read = SecToLook_Read;
160 static SRes SecToRead_Read(void *pp, void *buf, size_t *size)
162 CSecToRead *p = (CSecToRead *)pp;
163 return p->realStream->Read(p->realStream, buf, size);
166 void SecToRead_CreateVTable(CSecToRead *p)
168 p->s.Read = SecToRead_Read;