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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4680 | right-hear | 1 | #include "fitz.h" |
| 2 | |||
| 3 | fz_stream * |
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| 4 | fz_new_stream(void *state, |
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| 5 | int(*read)(fz_stream *stm, unsigned char *buf, int len), |
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| 6 | void(*close)(fz_stream *stm)) |
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| 7 | { |
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| 8 | fz_stream *stm; |
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| 9 | |||
| 10 | stm = fz_malloc(sizeof(fz_stream)); |
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| 11 | |||
| 12 | stm->refs = 1; |
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| 13 | stm->error = 0; |
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| 14 | stm->eof = 0; |
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| 15 | stm->pos = 0; |
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| 16 | |||
| 17 | stm->bits = 0; |
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| 18 | stm->avail = 0; |
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| 19 | |||
| 20 | stm->bp = stm->buf; |
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| 21 | stm->rp = stm->bp; |
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| 22 | stm->wp = stm->bp; |
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| 23 | stm->ep = stm->buf + sizeof stm->buf; |
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| 24 | |||
| 25 | stm->state = state; |
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| 26 | stm->read = read; |
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| 27 | stm->close = close; |
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| 28 | stm->seek = NULL; |
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| 29 | |||
| 30 | return stm; |
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| 31 | } |
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| 32 | |||
| 33 | fz_stream * |
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| 34 | fz_keep_stream(fz_stream *stm) |
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| 35 | { |
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| 36 | stm->refs ++; |
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| 37 | return stm; |
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| 38 | } |
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| 39 | |||
| 40 | void |
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| 41 | fz_close(fz_stream *stm) |
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| 42 | { |
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| 43 | stm->refs --; |
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| 44 | if (stm->refs == 0) |
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| 45 | { |
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| 46 | if (stm->close) |
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| 47 | stm->close(stm); |
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| 48 | fz_free(stm); |
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| 49 | } |
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| 50 | } |
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| 51 | |||
| 52 | /* File stream */ |
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| 53 | |||
| 54 | static int read_file(fz_stream *stm, unsigned char *buf, int len) |
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| 55 | { |
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| 56 | int n = read(*(int*)stm->state, buf, len); |
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| 57 | if (n < 0) |
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| 58 | return fz_throw("read error: %s", strerror(errno)); |
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| 59 | return n; |
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| 60 | } |
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| 61 | |||
| 62 | static void seek_file(fz_stream *stm, int offset, int whence) |
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| 63 | { |
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| 64 | int n = lseek(*(int*)stm->state, offset, whence); |
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| 65 | if (n < 0) |
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| 66 | fz_warn("cannot lseek: %s", strerror(errno)); |
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| 67 | stm->pos = n; |
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| 68 | stm->rp = stm->bp; |
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| 69 | stm->wp = stm->bp; |
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| 70 | } |
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| 71 | |||
| 72 | static void close_file(fz_stream *stm) |
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| 73 | { |
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| 74 | int n = close(*(int*)stm->state); |
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| 75 | if (n < 0) |
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| 76 | fz_warn("close error: %s", strerror(errno)); |
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| 77 | fz_free(stm->state); |
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| 78 | } |
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| 79 | |||
| 80 | fz_stream * |
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| 81 | fz_open_fd(int fd) |
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| 82 | { |
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| 83 | fz_stream *stm; |
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| 84 | int *state; |
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| 85 | |||
| 86 | state = fz_malloc(sizeof(int)); |
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| 87 | *state = fd; |
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| 88 | |||
| 89 | stm = fz_new_stream(state, read_file, close_file); |
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| 90 | stm->seek = seek_file; |
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| 91 | |||
| 92 | return stm; |
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| 93 | } |
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| 94 | |||
| 95 | fz_stream * |
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| 96 | fz_open_file(const char *name) |
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| 97 | { |
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| 98 | int fd = open(name, O_BINARY | O_RDONLY, 0); |
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| 99 | if (fd == -1) |
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| 100 | return NULL; |
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| 101 | return fz_open_fd(fd); |
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| 102 | } |
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| 103 | |||
| 104 | #ifdef _WIN32 |
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| 105 | fz_stream * |
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| 106 | fz_open_file_w(const wchar_t *name) |
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| 107 | { |
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| 108 | int fd = _wopen(name, O_BINARY | O_RDONLY, 0); |
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| 109 | if (fd == -1) |
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| 110 | return NULL; |
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| 111 | return fz_open_fd(fd); |
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| 112 | } |
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| 113 | #endif |
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| 114 | |||
| 115 | /* Memory stream */ |
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| 116 | |||
| 117 | static int read_buffer(fz_stream *stm, unsigned char *buf, int len) |
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| 118 | { |
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| 119 | return 0; |
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| 120 | } |
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| 121 | |||
| 122 | static void seek_buffer(fz_stream *stm, int offset, int whence) |
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| 123 | { |
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| 124 | if (whence == 0) |
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| 125 | stm->rp = stm->bp + offset; |
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| 126 | if (whence == 1) |
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| 127 | stm->rp += offset; |
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| 128 | if (whence == 2) |
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| 129 | stm->rp = stm->ep - offset; |
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| 130 | stm->rp = CLAMP(stm->rp, stm->bp, stm->ep); |
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| 131 | stm->wp = stm->ep; |
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| 132 | } |
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| 133 | |||
| 134 | static void close_buffer(fz_stream *stm) |
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| 135 | { |
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| 136 | if (stm->state) |
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| 137 | fz_drop_buffer(stm->state); |
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| 138 | } |
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| 139 | |||
| 140 | fz_stream * |
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| 141 | fz_open_buffer(fz_buffer *buf) |
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| 142 | { |
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| 143 | fz_stream *stm; |
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| 144 | |||
| 145 | stm = fz_new_stream(fz_keep_buffer(buf), read_buffer, close_buffer); |
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| 146 | stm->seek = seek_buffer; |
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| 147 | |||
| 148 | stm->bp = buf->data; |
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| 149 | stm->rp = buf->data; |
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| 150 | stm->wp = buf->data + buf->len; |
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| 151 | stm->ep = buf->data + buf->len; |
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| 152 | |||
| 153 | stm->pos = buf->len; |
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| 154 | |||
| 155 | return stm; |
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| 156 | } |
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| 157 | |||
| 158 | fz_stream * |
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| 159 | fz_open_memory(unsigned char *data, int len) |
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| 160 | { |
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| 161 | fz_stream *stm; |
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| 162 | |||
| 163 | stm = fz_new_stream(NULL, read_buffer, close_buffer); |
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| 164 | stm->seek = seek_buffer; |
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| 165 | |||
| 166 | stm->bp = data; |
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| 167 | stm->rp = data; |
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| 168 | stm->wp = data + len; |
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| 169 | stm->ep = data + len; |
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| 170 | |||
| 171 | stm->pos = len; |
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| 172 | |||
| 173 | return stm; |
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| 174 | } |