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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5728 | serge | 1 | /* 7zStream.c -- 7z Stream functions |
| 2 | 2013-11-12 : Igor Pavlov : Public domain */ |
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| 3 | |||
| 4 | #include "Precomp.h" |
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| 5 | |||
| 6 | #include |
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| 7 | |||
| 8 | #include "7zTypes.h" |
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| 9 | |||
| 10 | SRes SeqInStream_Read2(ISeqInStream *stream, void *buf, size_t size, SRes errorType) |
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| 11 | { |
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| 12 | while (size != 0) |
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| 13 | { |
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| 14 | size_t processed = size; |
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| 15 | RINOK(stream->Read(stream, buf, &processed)); |
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| 16 | if (processed == 0) |
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| 17 | return errorType; |
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| 18 | buf = (void *)((Byte *)buf + processed); |
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| 19 | size -= processed; |
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| 20 | } |
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| 21 | return SZ_OK; |
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| 22 | } |
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| 23 | |||
| 24 | SRes SeqInStream_Read(ISeqInStream *stream, void *buf, size_t size) |
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| 25 | { |
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| 26 | return SeqInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF); |
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| 27 | } |
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| 28 | |||
| 29 | SRes SeqInStream_ReadByte(ISeqInStream *stream, Byte *buf) |
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| 30 | { |
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| 31 | size_t processed = 1; |
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| 32 | RINOK(stream->Read(stream, buf, &processed)); |
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| 33 | return (processed == 1) ? SZ_OK : SZ_ERROR_INPUT_EOF; |
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| 34 | } |
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| 35 | |||
| 36 | SRes LookInStream_SeekTo(ILookInStream *stream, UInt64 offset) |
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| 37 | { |
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| 38 | Int64 t = offset; |
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| 39 | return stream->Seek(stream, &t, SZ_SEEK_SET); |
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| 40 | } |
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| 41 | |||
| 42 | SRes LookInStream_LookRead(ILookInStream *stream, void *buf, size_t *size) |
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| 43 | { |
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| 44 | const void *lookBuf; |
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| 45 | if (*size == 0) |
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| 46 | return SZ_OK; |
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| 47 | RINOK(stream->Look(stream, &lookBuf, size)); |
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| 48 | memcpy(buf, lookBuf, *size); |
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| 49 | return stream->Skip(stream, *size); |
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| 50 | } |
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| 51 | |||
| 52 | SRes LookInStream_Read2(ILookInStream *stream, void *buf, size_t size, SRes errorType) |
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| 53 | { |
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| 54 | while (size != 0) |
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| 55 | { |
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| 56 | size_t processed = size; |
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| 57 | RINOK(stream->Read(stream, buf, &processed)); |
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| 58 | if (processed == 0) |
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| 59 | return errorType; |
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| 60 | buf = (void *)((Byte *)buf + processed); |
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| 61 | size -= processed; |
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| 62 | } |
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| 63 | return SZ_OK; |
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| 64 | } |
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| 65 | |||
| 66 | SRes LookInStream_Read(ILookInStream *stream, void *buf, size_t size) |
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| 67 | { |
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| 68 | return LookInStream_Read2(stream, buf, size, SZ_ERROR_INPUT_EOF); |
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| 69 | } |
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| 70 | |||
| 71 | static SRes LookToRead_Look_Lookahead(void *pp, const void **buf, size_t *size) |
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| 72 | { |
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| 73 | SRes res = SZ_OK; |
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| 74 | CLookToRead *p = (CLookToRead *)pp; |
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| 75 | size_t size2 = p->size - p->pos; |
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| 76 | if (size2 == 0 && *size > 0) |
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| 77 | { |
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| 78 | p->pos = 0; |
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| 79 | size2 = LookToRead_BUF_SIZE; |
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| 80 | res = p->realStream->Read(p->realStream, p->buf, &size2); |
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| 81 | p->size = size2; |
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| 82 | } |
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| 83 | if (size2 < *size) |
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| 84 | *size = size2; |
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| 85 | *buf = p->buf + p->pos; |
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| 86 | return res; |
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| 87 | } |
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| 88 | |||
| 89 | static SRes LookToRead_Look_Exact(void *pp, const void **buf, size_t *size) |
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| 90 | { |
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| 91 | SRes res = SZ_OK; |
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| 92 | CLookToRead *p = (CLookToRead *)pp; |
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| 93 | size_t size2 = p->size - p->pos; |
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| 94 | if (size2 == 0 && *size > 0) |
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| 95 | { |
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| 96 | p->pos = 0; |
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| 97 | if (*size > LookToRead_BUF_SIZE) |
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| 98 | *size = LookToRead_BUF_SIZE; |
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| 99 | res = p->realStream->Read(p->realStream, p->buf, size); |
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| 100 | size2 = p->size = *size; |
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| 101 | } |
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| 102 | if (size2 < *size) |
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| 103 | *size = size2; |
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| 104 | *buf = p->buf + p->pos; |
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| 105 | return res; |
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| 106 | } |
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| 107 | |||
| 108 | static SRes LookToRead_Skip(void *pp, size_t offset) |
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| 109 | { |
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| 110 | CLookToRead *p = (CLookToRead *)pp; |
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| 111 | p->pos += offset; |
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| 112 | return SZ_OK; |
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| 113 | } |
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| 114 | |||
| 115 | static SRes LookToRead_Read(void *pp, void *buf, size_t *size) |
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| 116 | { |
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| 117 | CLookToRead *p = (CLookToRead *)pp; |
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| 118 | size_t rem = p->size - p->pos; |
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| 119 | if (rem == 0) |
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| 120 | return p->realStream->Read(p->realStream, buf, size); |
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| 121 | if (rem > *size) |
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| 122 | rem = *size; |
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| 123 | memcpy(buf, p->buf + p->pos, rem); |
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| 124 | p->pos += rem; |
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| 125 | *size = rem; |
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| 126 | return SZ_OK; |
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| 127 | } |
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| 128 | |||
| 129 | static SRes LookToRead_Seek(void *pp, Int64 *pos, ESzSeek origin) |
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| 130 | { |
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| 131 | CLookToRead *p = (CLookToRead *)pp; |
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| 132 | p->pos = p->size = 0; |
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| 133 | return p->realStream->Seek(p->realStream, pos, origin); |
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| 134 | } |
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| 135 | |||
| 136 | void LookToRead_CreateVTable(CLookToRead *p, int lookahead) |
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| 137 | { |
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| 138 | p->s.Look = lookahead ? |
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| 139 | LookToRead_Look_Lookahead : |
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| 140 | LookToRead_Look_Exact; |
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| 141 | p->s.Skip = LookToRead_Skip; |
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| 142 | p->s.Read = LookToRead_Read; |
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| 143 | p->s.Seek = LookToRead_Seek; |
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| 144 | } |
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| 145 | |||
| 146 | void LookToRead_Init(CLookToRead *p) |
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| 147 | { |
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| 148 | p->pos = p->size = 0; |
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| 149 | } |
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| 150 | |||
| 151 | static SRes SecToLook_Read(void *pp, void *buf, size_t *size) |
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| 152 | { |
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| 153 | CSecToLook *p = (CSecToLook *)pp; |
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| 154 | return LookInStream_LookRead(p->realStream, buf, size); |
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| 155 | } |
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| 156 | |||
| 157 | void SecToLook_CreateVTable(CSecToLook *p) |
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| 158 | { |
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| 159 | p->s.Read = SecToLook_Read; |
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| 160 | } |
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| 161 | |||
| 162 | static SRes SecToRead_Read(void *pp, void *buf, size_t *size) |
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| 163 | { |
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| 164 | CSecToRead *p = (CSecToRead *)pp; |
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| 165 | return p->realStream->Read(p->realStream, buf, size); |
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| 166 | } |
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| 167 | |||
| 168 | void SecToRead_CreateVTable(CSecToRead *p) |
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| 169 | { |
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| 170 | p->s.Read = SecToRead_Read; |
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| 171 | } |