Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4680 | right-hear | 1 | #include "fitz.h" |
| 2 | |||
| 3 | int |
||
| 4 | fz_read(fz_stream *stm, unsigned char *buf, int len) |
||
| 5 | { |
||
| 6 | int count, n; |
||
| 7 | |||
| 8 | count = MIN(len, stm->wp - stm->rp); |
||
| 9 | if (count) |
||
| 10 | { |
||
| 11 | memcpy(buf, stm->rp, count); |
||
| 12 | stm->rp += count; |
||
| 13 | } |
||
| 14 | |||
| 15 | if (count == len || stm->error || stm->eof) |
||
| 16 | return count; |
||
| 17 | |||
| 18 | assert(stm->rp == stm->wp); |
||
| 19 | |||
| 20 | if (len - count < stm->ep - stm->bp) |
||
| 21 | { |
||
| 22 | n = stm->read(stm, stm->bp, stm->ep - stm->bp); |
||
| 23 | if (n < 0) |
||
| 24 | { |
||
| 25 | stm->error = 1; |
||
| 26 | return fz_rethrow(n, "read error"); |
||
| 27 | } |
||
| 28 | else if (n == 0) |
||
| 29 | { |
||
| 30 | stm->eof = 1; |
||
| 31 | } |
||
| 32 | else if (n > 0) |
||
| 33 | { |
||
| 34 | stm->rp = stm->bp; |
||
| 35 | stm->wp = stm->bp + n; |
||
| 36 | stm->pos += n; |
||
| 37 | } |
||
| 38 | |||
| 39 | n = MIN(len - count, stm->wp - stm->rp); |
||
| 40 | if (n) |
||
| 41 | { |
||
| 42 | memcpy(buf + count, stm->rp, n); |
||
| 43 | stm->rp += n; |
||
| 44 | count += n; |
||
| 45 | } |
||
| 46 | } |
||
| 47 | else |
||
| 48 | { |
||
| 49 | n = stm->read(stm, buf + count, len - count); |
||
| 50 | if (n < 0) |
||
| 51 | { |
||
| 52 | stm->error = 1; |
||
| 53 | return fz_rethrow(n, "read error"); |
||
| 54 | } |
||
| 55 | else if (n == 0) |
||
| 56 | { |
||
| 57 | stm->eof = 1; |
||
| 58 | } |
||
| 59 | else if (n > 0) |
||
| 60 | { |
||
| 61 | stm->pos += n; |
||
| 62 | count += n; |
||
| 63 | } |
||
| 64 | } |
||
| 65 | |||
| 66 | return count; |
||
| 67 | } |
||
| 68 | |||
| 69 | void |
||
| 70 | fz_fill_buffer(fz_stream *stm) |
||
| 71 | { |
||
| 72 | int n; |
||
| 73 | |||
| 74 | assert(stm->rp == stm->wp); |
||
| 75 | |||
| 76 | if (stm->error || stm->eof) |
||
| 77 | return; |
||
| 78 | |||
| 79 | n = stm->read(stm, stm->bp, stm->ep - stm->bp); |
||
| 80 | if (n < 0) |
||
| 81 | { |
||
| 82 | stm->error = 1; |
||
| 83 | fz_catch(n, "read error; treating as end of file"); |
||
| 84 | } |
||
| 85 | else if (n == 0) |
||
| 86 | { |
||
| 87 | stm->eof = 1; |
||
| 88 | } |
||
| 89 | else if (n > 0) |
||
| 90 | { |
||
| 91 | stm->rp = stm->bp; |
||
| 92 | stm->wp = stm->bp + n; |
||
| 93 | stm->pos += n; |
||
| 94 | } |
||
| 95 | } |
||
| 96 | |||
| 97 | fz_error |
||
| 98 | fz_read_all(fz_buffer **bufp, fz_stream *stm, int initial) |
||
| 99 | { |
||
| 100 | fz_buffer *buf; |
||
| 101 | int n; |
||
| 102 | |||
| 103 | if (initial < 1024) |
||
| 104 | initial = 1024; |
||
| 105 | |||
| 106 | buf = fz_new_buffer(initial); |
||
| 107 | |||
| 108 | while (1) |
||
| 109 | { |
||
| 110 | if (buf->len == buf->cap) |
||
| 111 | fz_grow_buffer(buf); |
||
| 112 | |||
| 113 | if (buf->len / 200 > initial) |
||
| 114 | { |
||
| 115 | fz_drop_buffer(buf); |
||
| 116 | return fz_throw("compression bomb detected"); |
||
| 117 | } |
||
| 118 | |||
| 119 | n = fz_read(stm, buf->data + buf->len, buf->cap - buf->len); |
||
| 120 | if (n < 0) |
||
| 121 | { |
||
| 122 | fz_drop_buffer(buf); |
||
| 123 | return fz_rethrow(n, "read error"); |
||
| 124 | } |
||
| 125 | if (n == 0) |
||
| 126 | break; |
||
| 127 | |||
| 128 | buf->len += n; |
||
| 129 | } |
||
| 130 | |||
| 131 | *bufp = buf; |
||
| 132 | return fz_okay; |
||
| 133 | } |
||
| 134 | |||
| 135 | void |
||
| 136 | fz_read_line(fz_stream *stm, char *mem, int n) |
||
| 137 | { |
||
| 138 | char *s = mem; |
||
| 139 | int c = EOF; |
||
| 140 | while (n > 1) |
||
| 141 | { |
||
| 142 | c = fz_read_byte(stm); |
||
| 143 | if (c == EOF) |
||
| 144 | break; |
||
| 145 | if (c == '\r') { |
||
| 146 | c = fz_peek_byte(stm); |
||
| 147 | if (c == '\n') |
||
| 148 | fz_read_byte(stm); |
||
| 149 | break; |
||
| 150 | } |
||
| 151 | if (c == '\n') |
||
| 152 | break; |
||
| 153 | *s++ = c; |
||
| 154 | n--; |
||
| 155 | } |
||
| 156 | if (n) |
||
| 157 | *s = '\0'; |
||
| 158 | } |
||
| 159 | |||
| 160 | int |
||
| 161 | fz_tell(fz_stream *stm) |
||
| 162 | { |
||
| 163 | return stm->pos - (stm->wp - stm->rp); |
||
| 164 | } |
||
| 165 | |||
| 166 | void |
||
| 167 | fz_seek(fz_stream *stm, int offset, int whence) |
||
| 168 | { |
||
| 169 | if (stm->seek) |
||
| 170 | { |
||
| 171 | if (whence == 1) |
||
| 172 | { |
||
| 173 | offset = fz_tell(stm) + offset; |
||
| 174 | whence = 0; |
||
| 175 | } |
||
| 176 | if (whence == 0) |
||
| 177 | { |
||
| 178 | unsigned char *p = stm->wp - (stm->pos - offset); |
||
| 179 | if (p >= stm->bp && p <= stm->wp) |
||
| 180 | { |
||
| 181 | stm->rp = p; |
||
| 182 | stm->eof = 0; |
||
| 183 | return; |
||
| 184 | } |
||
| 185 | } |
||
| 186 | stm->seek(stm, offset, whence); |
||
| 187 | stm->eof = 0; |
||
| 188 | } |
||
| 189 | else if (whence != 2) |
||
| 190 | { |
||
| 191 | if (whence == 0) |
||
| 192 | offset -= fz_tell(stm); |
||
| 193 | if (offset < 0) |
||
| 194 | fz_warn("cannot seek backwards"); |
||
| 195 | /* dog slow, but rare enough */ |
||
| 196 | while (offset-- > 0) |
||
| 197 | fz_read_byte(stm); |
||
| 198 | } |
||
| 199 | else |
||
| 200 | fz_warn("cannot seek"); |
||
| 201 | } |