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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 8619 | maxcodehac | 1 | /* |
| 2 | jbig2dec |
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| 3 | |||
| 4 | Copyright (C) 2009 Artifex Software, Inc. |
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| 5 | |||
| 6 | This software is distributed under license and may not |
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| 7 | be copied, modified or distributed except as expressly |
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| 8 | authorized under the terms of the license contained in |
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| 9 | the file LICENSE in this distribution. |
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| 10 | |||
| 11 | For further licensing information refer to http://artifex.com/ or |
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| 12 | contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, |
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| 13 | San Rafael, CA 94903, U.S.A., +1(415)492-9861. |
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| 14 | */ |
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| 15 | |||
| 16 | #ifdef HAVE_CONFIG_H |
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| 17 | #include "config.h" |
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| 18 | #endif |
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| 19 | #include "os_types.h" |
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| 20 | |||
| 21 | #include |
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| 22 | #include |
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| 23 | |||
| 24 | #include "jbig2.h" |
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| 25 | #include "jbig2_image.h" |
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| 26 | |||
| 27 | /* take an image structure and write it to a file in pbm format */ |
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| 28 | |||
| 29 | int jbig2_image_write_pbm_file(Jbig2Image *image, char *filename) |
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| 30 | { |
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| 31 | FILE *out; |
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| 32 | int error; |
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| 33 | |||
| 34 | if ((out = fopen(filename, "wb")) == NULL) { |
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| 35 | fprintf(stderr, "unable to open '%s' for writing", filename); |
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| 36 | return 1; |
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| 37 | } |
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| 38 | |||
| 39 | error = jbig2_image_write_pbm(image, out); |
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| 40 | |||
| 41 | fclose(out); |
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| 42 | return (error); |
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| 43 | } |
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| 44 | |||
| 45 | /* write out an image struct as a pbm stream to an open file pointer */ |
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| 46 | |||
| 47 | int jbig2_image_write_pbm(Jbig2Image *image, FILE *out) |
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| 48 | { |
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| 49 | /* pbm header */ |
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| 50 | fprintf(out, "P4\n%d %d\n", image->width, image->height); |
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| 51 | |||
| 52 | /* pbm format pads to a byte boundary, so we can |
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| 53 | just write out the whole data buffer |
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| 54 | NB: this assumes minimal stride for the width */ |
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| 55 | fwrite(image->data, 1, image->height*image->stride, out); |
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| 56 | |||
| 57 | /* success */ |
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| 58 | return 0; |
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| 59 | } |
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| 60 | |||
| 61 | /* take an image from a file in pbm format */ |
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| 62 | Jbig2Image *jbig2_image_read_pbm_file(Jbig2Ctx *ctx, char *filename) |
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| 63 | { |
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| 64 | FILE *in; |
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| 65 | Jbig2Image *image; |
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| 66 | |||
| 67 | if ((in = fopen(filename, "rb")) == NULL) { |
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| 68 | fprintf(stderr, "unable to open '%s' for reading\n", filename); |
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| 69 | return NULL; |
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| 70 | } |
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| 71 | |||
| 72 | image = jbig2_image_read_pbm(ctx, in); |
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| 73 | |||
| 74 | fclose(in); |
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| 75 | |||
| 76 | return (image); |
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| 77 | } |
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| 78 | |||
| 79 | /* FIXME: should handle multi-image files */ |
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| 80 | Jbig2Image *jbig2_image_read_pbm(Jbig2Ctx *ctx, FILE *in) |
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| 81 | { |
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| 82 | int i, dim[2]; |
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| 83 | int done; |
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| 84 | Jbig2Image *image; |
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| 85 | int c; |
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| 86 | char buf[32]; |
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| 87 | |||
| 88 | /* look for 'P4' magic */ |
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| 89 | while ((c = fgetc(in)) != 'P') { |
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| 90 | if (feof(in)) return NULL; |
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| 91 | } |
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| 92 | if ((c = fgetc(in)) != '4') { |
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| 93 | fprintf(stderr, "not a binary pbm file.\n"); |
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| 94 | return NULL; |
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| 95 | } |
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| 96 | /* read size. we must find two decimal numbers representing |
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| 97 | the image dimensions. 'done' will index whether we're |
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| 98 | looking for the width or the height and 'i' will be our |
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| 99 | array index for copying strings into our buffer */ |
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| 100 | done = 0; |
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| 101 | i = 0; |
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| 102 | while (done < 2) { |
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| 103 | c = fgetc(in); |
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| 104 | /* skip whitespace */ |
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| 105 | if (c == ' ' || c == '\t' || c == '\r' || c == '\n') continue; |
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| 106 | /* skip comments */ |
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| 107 | if (c == '#') { |
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| 108 | while ((c = fgetc(in)) != '\n'); |
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| 109 | continue; |
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| 110 | } |
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| 111 | /* report unexpected eof */ |
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| 112 | if (c == EOF) { |
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| 113 | fprintf(stderr, "end-of-file parsing pbm header\n"); |
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| 114 | return NULL; |
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| 115 | } |
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| 116 | if (isdigit(c)) { |
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| 117 | buf[i++] = c; |
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| 118 | while (isdigit(c = fgetc(in))) { |
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| 119 | if (i >= 32) { |
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| 120 | fprintf(stderr, "pbm parsing error\n"); |
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| 121 | return NULL; |
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| 122 | } |
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| 123 | buf[i++] = c; |
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| 124 | } |
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| 125 | buf[i] = '\0'; |
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| 126 | if (sscanf(buf, "%d", &dim[done]) != 1) { |
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| 127 | fprintf(stderr, "couldn't read pbm image dimensions\n"); |
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| 128 | return NULL; |
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| 129 | } |
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| 130 | i = 0; |
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| 131 | done++; |
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| 132 | } |
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| 133 | } |
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| 134 | /* allocate image structure */ |
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| 135 | image = jbig2_image_new(ctx, dim[0], dim[1]); |
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| 136 | if (image == NULL) { |
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| 137 | fprintf(stderr, "could not allocate %dx%d image for pbm file\n", dim[0], dim[1]); |
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| 138 | return NULL; |
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| 139 | } |
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| 140 | /* the pbm data is byte-aligned, so we can |
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| 141 | do a simple block read */ |
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| 142 | fread(image->data, 1, image->height*image->stride, in); |
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| 143 | if (feof(in)) { |
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| 144 | fprintf(stderr, "unexpected end of pbm file.\n"); |
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| 145 | jbig2_image_release(ctx, image); |
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| 146 | return NULL; |
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| 147 | } |
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| 148 | /* success */ |
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| 149 | return image; |
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| 150 | } |