| /* 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; |
| } |