Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/jdatasrc.c @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * jdatasrc.c
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3 *
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4 * Copyright (C) 1994-1996, Thomas G. Lane.
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5 * Modified 2009-2022 by Guido Vollbeding.
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6 * This file is part of the Independent JPEG Group's software.
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7 * For conditions of distribution and use, see the accompanying README file.
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8 *
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9 * This file contains decompression data source routines for the case of
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10 * reading JPEG data from memory or from a file (or any stdio stream).
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11 * While these routines are sufficient for most applications,
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12 * some will want to use a different source manager.
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13 * IMPORTANT: we assume that fread() will correctly transcribe an array of
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14 * JOCTETs from 8-bit-wide elements on external storage. If char is wider
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15 * than 8 bits on your machine, you may need to do some tweaking.
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16 */
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18 /* this is not a core library module, so it doesn't define JPEG_INTERNALS */
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19 #include "jinclude.h"
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20 #include "jpeglib.h"
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21 #include "jerror.h"
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24 /* Expanded data source object for stdio input */
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26 #define INPUT_BUF_SIZE 4096 /* choose an efficiently fread'able size */
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28 typedef struct {
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29 struct jpeg_source_mgr pub; /* public fields */
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31 FILE * infile; /* source stream */
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32 JOCTET buffer[INPUT_BUF_SIZE]; /* input buffer */
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33 boolean start_of_file; /* have we gotten any data yet? */
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34 } my_source_mgr;
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36 typedef my_source_mgr * my_src_ptr;
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39 /*
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40 * Initialize source --- called by jpeg_read_header
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41 * before any data is actually read.
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42 */
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44 METHODDEF(void)
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45 init_source (j_decompress_ptr cinfo)
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46 {
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47 my_src_ptr src = (my_src_ptr) cinfo->src;
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49 /* We reset the empty-input-file flag for each image,
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50 * but we don't clear the input buffer.
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51 * This is correct behavior for reading a series of images from one source.
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52 */
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53 src->start_of_file = TRUE;
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54 }
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56 METHODDEF(void)
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57 init_mem_source (j_decompress_ptr cinfo)
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58 {
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59 /* no work necessary here */
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60 }
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63 /*
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64 * Fill the input buffer --- called whenever buffer is emptied.
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65 *
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66 * In typical applications, this should read fresh data into the buffer
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67 * (ignoring the current state of next_input_byte & bytes_in_buffer),
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68 * reset the pointer & count to the start of the buffer, and return TRUE
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69 * indicating that the buffer has been reloaded. It is not necessary to
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70 * fill the buffer entirely, only to obtain at least one more byte.
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71 *
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72 * There is no such thing as an EOF return. If the end of the file has been
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73 * reached, the routine has a choice of ERREXIT() or inserting fake data into
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74 * the buffer. In most cases, generating a warning message and inserting a
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75 * fake EOI marker is the best course of action --- this will allow the
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76 * decompressor to output however much of the image is there. However,
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77 * the resulting error message is misleading if the real problem is an empty
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78 * input file, so we handle that case specially.
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79 *
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80 * In applications that need to be able to suspend compression due to input
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81 * not being available yet, a FALSE return indicates that no more data can be
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82 * obtained right now, but more may be forthcoming later. In this situation,
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83 * the decompressor will return to its caller (with an indication of the
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84 * number of scanlines it has read, if any). The application should resume
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85 * decompression after it has loaded more data into the input buffer. Note
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86 * that there are substantial restrictions on the use of suspension --- see
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87 * the documentation.
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88 *
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89 * When suspending, the decompressor will back up to a convenient restart point
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90 * (typically the start of the current MCU). next_input_byte & bytes_in_buffer
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91 * indicate where the restart point will be if the current call returns FALSE.
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92 * Data beyond this point must be rescanned after resumption, so move it to
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93 * the front of the buffer rather than discarding it.
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94 */
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95
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96 METHODDEF(boolean)
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97 fill_input_buffer (j_decompress_ptr cinfo)
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98 {
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99 my_src_ptr src = (my_src_ptr) cinfo->src;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 size_t nbytes;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
101
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 nbytes = JFREAD(src->infile, src->buffer, INPUT_BUF_SIZE);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 if (nbytes <= 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 if (src->start_of_file) /* Treat empty input file as fatal error */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 ERREXIT(cinfo, JERR_INPUT_EMPTY);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 WARNMS(cinfo, JWRN_JPEG_EOF);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
108 /* Insert a fake EOI marker */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109 src->buffer[0] = (JOCTET) 0xFF;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 src->buffer[1] = (JOCTET) JPEG_EOI;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 nbytes = 2;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
114 src->pub.next_input_byte = src->buffer;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 src->pub.bytes_in_buffer = nbytes;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116 src->start_of_file = FALSE;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
117
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
118 return TRUE;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
119 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
120
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 METHODDEF(boolean)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
122 fill_mem_input_buffer (j_decompress_ptr cinfo)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 static const JOCTET mybuffer[4] = {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
125 (JOCTET) 0xFF, (JOCTET) JPEG_EOI, 0, 0
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126 };
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
127
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
128 /* The whole JPEG data is expected to reside in the supplied memory
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
129 * buffer, so any request for more data beyond the given buffer size
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
130 * is treated as an error.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
131 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
132 WARNMS(cinfo, JWRN_JPEG_EOF);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
133
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
134 /* Insert a fake EOI marker */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 cinfo->src->next_input_byte = mybuffer;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 cinfo->src->bytes_in_buffer = 2;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 return TRUE;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
140 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 /*
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
144 * Skip data --- used to skip over a potentially large amount of
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 * uninteresting data (such as an APPn marker).
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 * Writers of suspendable-input applications must note that skip_input_data
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
148 * is not granted the right to give a suspension return. If the skip extends
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
149 * beyond the data currently in the buffer, the buffer can be marked empty so
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 * that the next read will cause a fill_input_buffer call that can suspend.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
151 * Arranging for additional bytes to be discarded before reloading the input
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 * buffer is the application writer's problem.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 METHODDEF(void)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 skip_input_data (j_decompress_ptr cinfo, long num_bytes)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 struct jpeg_source_mgr * src = cinfo->src;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 size_t nbytes;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 /* Just a dumb implementation for now. Could use fseek() except
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 * it doesn't work on pipes. Not clear that being smart is worth
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 * any trouble anyway --- large skips are infrequent.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 if (num_bytes > 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 nbytes = (size_t) num_bytes;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 while (nbytes > src->bytes_in_buffer) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 nbytes -= src->bytes_in_buffer;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 (void) (*src->fill_input_buffer) (cinfo);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 /* note we assume that fill_input_buffer will never return FALSE,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 * so suspension need not be handled.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 src->next_input_byte += nbytes;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 src->bytes_in_buffer -= nbytes;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 /*
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 * An additional method that can be provided by data source modules is the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 * resync_to_restart method for error recovery in the presence of RST markers.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 * For the moment, this source module just uses the default resync method
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 * provided by the JPEG library. That method assumes that no backtracking
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 * is possible.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 /*
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 * Terminate source --- called by jpeg_finish_decompress
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 * after all data has been read. Often a no-op.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 * application must deal with any cleanup that should happen even
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 * for error exit.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 METHODDEF(void)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
199 term_source (j_decompress_ptr cinfo)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
201 /* no work necessary here */
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202 }
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203
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204
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205 /*
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206 * Prepare for input from a stdio stream.
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207 * The caller must have already opened the stream,
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208 * and is responsible for closing it after finishing decompression.
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209 */
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210
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211 GLOBAL(void)
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212 jpeg_stdio_src (j_decompress_ptr cinfo, FILE * infile)
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213 {
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214 my_src_ptr src;
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215
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216 /* The source object including the input buffer is made permanent so that
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217 * a series of JPEG images can be read from the same file by calling
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218 * jpeg_stdio_src only before the first one. (If we discarded the buffer
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219 * at the end of one image, we'd likely lose the start of the next one.)
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220 * This makes it unsafe to use this manager and a different source
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221 * manager serially with the same JPEG object. Caveat programmer.
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222 */
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223 if (cinfo->src == NULL) { /* first time for this JPEG object? */
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224 cinfo->src = (struct jpeg_source_mgr *) (*cinfo->mem->alloc_small)
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225 ((j_common_ptr) cinfo, JPOOL_PERMANENT, SIZEOF(my_source_mgr));
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226 }
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227
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228 src = (my_src_ptr) cinfo->src;
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229 src->pub.init_source = init_source;
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230 src->pub.fill_input_buffer = fill_input_buffer;
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231 src->pub.skip_input_data = skip_input_data;
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232 src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
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233 src->pub.term_source = term_source;
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234 src->infile = infile;
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235 src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
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236 src->pub.next_input_byte = NULL; /* until buffer loaded */
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237 }
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238
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239
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240 /*
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241 * Prepare for input from a supplied memory buffer.
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242 * The buffer must contain the whole JPEG data.
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243 */
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244
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245 GLOBAL(void)
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246 jpeg_mem_src (j_decompress_ptr cinfo,
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247 const unsigned char * inbuffer, size_t insize)
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248 {
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249 struct jpeg_source_mgr * src;
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250
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251 if (inbuffer == NULL || insize == 0) /* Treat empty input as fatal error */
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252 ERREXIT(cinfo, JERR_INPUT_EMPTY);
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253
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254 /* The source object is made permanent so that a series of JPEG images
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255 * can be read from the same buffer by calling jpeg_mem_src only before
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256 * the first one.
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257 */
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258 if (cinfo->src == NULL) { /* first time for this JPEG object? */
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259 cinfo->src = (struct jpeg_source_mgr *) (*cinfo->mem->alloc_small)
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260 ((j_common_ptr) cinfo, JPOOL_PERMANENT, SIZEOF(struct jpeg_source_mgr));
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261 }
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262
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263 src = cinfo->src;
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264 src->init_source = init_mem_source;
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265 src->fill_input_buffer = fill_mem_input_buffer;
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266 src->skip_input_data = skip_input_data;
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267 src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
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268 src->term_source = term_source;
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269 src->bytes_in_buffer = insize;
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270 src->next_input_byte = (const JOCTET *) inbuffer;
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271 }