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<html><head><title>dlib C++ Library - jdatasrc.c</title></head><body bgcolor='white'><pre> |
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<font color='#009900'>/*
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* jdatasrc.c
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*
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* Modified 2009-2011 by Guido Vollbeding.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains decompression data source routines for the case of
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* reading JPEG data from memory or from a file (or any stdio stream).
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* While these routines are sufficient for most applications,
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* some will want to use a different source manager.
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* IMPORTANT: we assume that fread() will correctly transcribe an array of
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* JOCTETs from 8-bit-wide elements on external storage. If char is wider
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* than 8 bits on your machine, you may need to do some tweaking.
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*/</font>
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<font color='#009900'>/* this is not a core library module, so it doesn't define JPEG_INTERNALS */</font>
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jinclude.h.html'>jinclude.h</a>"
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jpeglib.h.html'>jpeglib.h</a>"
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jerror.h.html'>jerror.h</a>"
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<font color='#009900'>/* Expanded data source object for stdio input */</font>
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<font color='#0000FF'>typedef</font> <font color='#0000FF'>struct</font> <b>{</b>
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<font color='#0000FF'>struct</font> jpeg_source_mgr pub; <font color='#009900'>/* public fields */</font>
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FILE <font color='#5555FF'>*</font> infile; <font color='#009900'>/* source stream */</font>
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JOCTET <font color='#5555FF'>*</font> buffer; <font color='#009900'>/* start of buffer */</font>
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boolean start_of_file; <font color='#009900'>/* have we gotten any data yet? */</font>
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<b>}</b> my_source_mgr;
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<font color='#0000FF'>typedef</font> my_source_mgr <font color='#5555FF'>*</font> my_src_ptr;
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<font color='#0000FF'>#define</font> INPUT_BUF_SIZE <font color='#979000'>4096</font> <font color='#009900'>/* choose an efficiently fread'able size */</font>
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<font color='#009900'>/*
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* Initialize source --- called by jpeg_read_header
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* before any data is actually read.
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*/</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='init_source'></a>init_source</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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my_src_ptr src <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_src_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src;
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<font color='#009900'>/* We reset the empty-input-file flag for each image,
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* but we don't clear the input buffer.
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* This is correct behavior for reading a series of images from one source.
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*/</font>
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>start_of_file <font color='#5555FF'>=</font> TRUE;
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<b>}</b>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='init_mem_source'></a>init_mem_source</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#009900'>/* no work necessary here */</font>
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<b>}</b>
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<font color='#009900'>/*
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* Fill the input buffer --- called whenever buffer is emptied.
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*
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* In typical applications, this should read fresh data into the buffer
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* (ignoring the current state of next_input_byte & bytes_in_buffer),
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* reset the pointer & count to the start of the buffer, and return TRUE
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* indicating that the buffer has been reloaded. It is not necessary to
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* fill the buffer entirely, only to obtain at least one more byte.
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*
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* There is no such thing as an EOF return. If the end of the file has been
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* reached, the routine has a choice of ERREXIT() or inserting fake data into
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* the buffer. In most cases, generating a warning message and inserting a
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* fake EOI marker is the best course of action --- this will allow the
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* decompressor to output however much of the image is there. However,
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* the resulting error message is misleading if the real problem is an empty
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* input file, so we handle that case specially.
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*
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* In applications that need to be able to suspend compression due to input
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* not being available yet, a FALSE return indicates that no more data can be
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* obtained right now, but more may be forthcoming later. In this situation,
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* the decompressor will return to its caller (with an indication of the
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* number of scanlines it has read, if any). The application should resume
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* decompression after it has loaded more data into the input buffer. Note
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* that there are substantial restrictions on the use of suspension --- see
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* the documentation.
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*
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* When suspending, the decompressor will back up to a convenient restart point
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* (typically the start of the current MCU). next_input_byte & bytes_in_buffer
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* indicate where the restart point will be if the current call returns FALSE.
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* Data beyond this point must be rescanned after resumption, so move it to
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* the front of the buffer rather than discarding it.
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*/</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font>boolean<font face='Lucida Console'>)</font>
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<b><a name='fill_input_buffer'></a>fill_input_buffer</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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my_src_ptr src <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_src_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src;
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<font color='#0000FF'><u>size_t</u></font> nbytes;
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nbytes <font color='#5555FF'>=</font> <font color='#BB00BB'>JFREAD</font><font face='Lucida Console'>(</font>src<font color='#5555FF'>-</font><font color='#5555FF'>></font>infile, src<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer, INPUT_BUF_SIZE<font face='Lucida Console'>)</font>;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>nbytes <font color='#5555FF'><</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> <b>{</b>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>src<font color='#5555FF'>-</font><font color='#5555FF'>></font>start_of_file<font face='Lucida Console'>)</font> <font color='#009900'>/* Treat empty input file as fatal error */</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_INPUT_EMPTY<font face='Lucida Console'>)</font>;
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<font color='#BB00BB'>WARNMS</font><font face='Lucida Console'>(</font>cinfo, JWRN_JPEG_EOF<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Insert a fake EOI marker */</font>
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer[<font color='#979000'>0</font>] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JOCTET<font face='Lucida Console'>)</font> <font color='#979000'>0xFF</font>;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer[<font color='#979000'>1</font>] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JOCTET<font face='Lucida Console'>)</font> JPEG_EOI;
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nbytes <font color='#5555FF'>=</font> <font color='#979000'>2</font>;
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<b>}</b>
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.next_input_byte <font color='#5555FF'>=</font> src<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.bytes_in_buffer <font color='#5555FF'>=</font> nbytes;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>start_of_file <font color='#5555FF'>=</font> FALSE;
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<font color='#0000FF'>return</font> TRUE;
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<b>}</b>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font>boolean<font face='Lucida Console'>)</font>
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<b><a name='fill_mem_input_buffer'></a>fill_mem_input_buffer</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>static</font> <font color='#0000FF'>const</font> JOCTET mybuffer[<font color='#979000'>4</font>] <font color='#5555FF'>=</font> <b>{</b>
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<font face='Lucida Console'>(</font>JOCTET<font face='Lucida Console'>)</font> <font color='#979000'>0xFF</font>, <font face='Lucida Console'>(</font>JOCTET<font face='Lucida Console'>)</font> JPEG_EOI, <font color='#979000'>0</font>, <font color='#979000'>0</font>
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<b>}</b>;
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<font color='#009900'>/* The whole JPEG data is expected to reside in the supplied memory
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* buffer, so any request for more data beyond the given buffer size
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* is treated as an error.
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*/</font>
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<font color='#BB00BB'>WARNMS</font><font face='Lucida Console'>(</font>cinfo, JWRN_JPEG_EOF<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* Insert a fake EOI marker */</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src<font color='#5555FF'>-</font><font color='#5555FF'>></font>next_input_byte <font color='#5555FF'>=</font> mybuffer;
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src<font color='#5555FF'>-</font><font color='#5555FF'>></font>bytes_in_buffer <font color='#5555FF'>=</font> <font color='#979000'>2</font>;
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<font color='#0000FF'>return</font> TRUE;
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<b>}</b>
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<font color='#009900'>/*
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* Skip data --- used to skip over a potentially large amount of
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* uninteresting data (such as an APPn marker).
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*
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* Writers of suspendable-input applications must note that skip_input_data
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* is not granted the right to give a suspension return. If the skip extends
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* beyond the data currently in the buffer, the buffer can be marked empty so
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* that the next read will cause a fill_input_buffer call that can suspend.
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* Arranging for additional bytes to be discarded before reloading the input
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* buffer is the application writer's problem.
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*/</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='skip_input_data'></a>skip_input_data</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo, <font color='#0000FF'><u>long</u></font> num_bytes<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>struct</font> jpeg_source_mgr <font color='#5555FF'>*</font> src <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src;
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<font color='#009900'>/* Just a dumb implementation for now. Could use fseek() except
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* it doesn't work on pipes. Not clear that being smart is worth
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* any trouble anyway --- large skips are infrequent.
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*/</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>num_bytes <font color='#5555FF'>></font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> <b>{</b>
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<font color='#0000FF'>while</font> <font face='Lucida Console'>(</font>num_bytes <font color='#5555FF'>></font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font> src<font color='#5555FF'>-</font><font color='#5555FF'>></font>bytes_in_buffer<font face='Lucida Console'>)</font> <b>{</b>
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num_bytes <font color='#5555FF'>-</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>long</u></font><font face='Lucida Console'>)</font> src<font color='#5555FF'>-</font><font color='#5555FF'>></font>bytes_in_buffer;
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<font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font color='#5555FF'>*</font>src<font color='#5555FF'>-</font><font color='#5555FF'>></font>fill_input_buffer<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* note we assume that fill_input_buffer will never return FALSE,
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* so suspension need not be handled.
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*/</font>
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<b>}</b>
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>next_input_byte <font color='#5555FF'>+</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>size_t</u></font><font face='Lucida Console'>)</font> num_bytes;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>bytes_in_buffer <font color='#5555FF'>-</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>size_t</u></font><font face='Lucida Console'>)</font> num_bytes;
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<b>}</b>
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<b>}</b>
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<font color='#009900'>/*
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* An additional method that can be provided by data source modules is the
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* resync_to_restart method for error recovery in the presence of RST markers.
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* For the moment, this source module just uses the default resync method
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* provided by the JPEG library. That method assumes that no backtracking
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* is possible.
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*/</font>
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<font color='#009900'>/*
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* Terminate source --- called by jpeg_finish_decompress
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* after all data has been read. Often a no-op.
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*
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* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
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* application must deal with any cleanup that should happen even
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* for error exit.
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*/</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='term_source'></a>term_source</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#009900'>/* no work necessary here */</font>
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<b>}</b>
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<font color='#009900'>/*
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* Prepare for input from a stdio stream.
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* The caller must have already opened the stream, and is responsible
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* for closing it after finishing decompression.
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*/</font>
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<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_stdio_src'></a>jpeg_stdio_src</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo, FILE <font color='#5555FF'>*</font> infile<font face='Lucida Console'>)</font>
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<b>{</b>
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my_src_ptr src;
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<font color='#009900'>/* The source object and input buffer are made permanent so that a series
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* of JPEG images can be read from the same file by calling jpeg_stdio_src
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* only before the first one. (If we discarded the buffer at the end of
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* one image, we'd likely lose the start of the next one.)
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* This makes it unsafe to use this manager and a different source
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* manager serially with the same JPEG object. Caveat programmer.
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*/</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b> <font color='#009900'>/* first time for this JPEG object? */</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> jpeg_source_mgr <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_PERMANENT,
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<font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>my_source_mgr<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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src <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_src_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JOCTET <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_PERMANENT,
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INPUT_BUF_SIZE <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JOCTET<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<b>}</b>
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src <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_src_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.init_source <font color='#5555FF'>=</font> init_source;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.fill_input_buffer <font color='#5555FF'>=</font> fill_input_buffer;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.skip_input_data <font color='#5555FF'>=</font> skip_input_data;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.resync_to_restart <font color='#5555FF'>=</font> jpeg_resync_to_restart; <font color='#009900'>/* use default method */</font>
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.term_source <font color='#5555FF'>=</font> term_source;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>infile <font color='#5555FF'>=</font> infile;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.bytes_in_buffer <font color='#5555FF'>=</font> <font color='#979000'>0</font>; <font color='#009900'>/* forces fill_input_buffer on first read */</font>
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.next_input_byte <font color='#5555FF'>=</font> NULL; <font color='#009900'>/* until buffer loaded */</font>
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<b>}</b>
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<font color='#009900'>/*
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* Prepare for input from a supplied memory buffer.
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* The buffer must contain the whole JPEG data.
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*/</font>
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<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='jpeg_mem_src'></a>jpeg_mem_src</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo,
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<font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>char</u></font> <font color='#5555FF'>*</font> inbuffer, <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> insize<font face='Lucida Console'>)</font>
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<b>{</b>
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<font color='#0000FF'>struct</font> jpeg_source_mgr <font color='#5555FF'>*</font> src;
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>inbuffer <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL <font color='#5555FF'>|</font><font color='#5555FF'>|</font> insize <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> <font color='#009900'>/* Treat empty input as fatal error */</font>
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<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_INPUT_EMPTY<font face='Lucida Console'>)</font>;
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<font color='#009900'>/* The source object is made permanent so that a series of JPEG images
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* can be read from the same buffer by calling jpeg_mem_src only before
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* the first one.
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*/</font>
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<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font> <b>{</b> <font color='#009900'>/* first time for this JPEG object? */</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> jpeg_source_mgr <font color='#5555FF'>*</font><font face='Lucida Console'>)</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_PERMANENT,
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<font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> <b><a name='jpeg_source_mgr'></a>jpeg_source_mgr</b><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<b>}</b>
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src <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>src;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>init_source <font color='#5555FF'>=</font> init_mem_source;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>fill_input_buffer <font color='#5555FF'>=</font> fill_mem_input_buffer;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>skip_input_data <font color='#5555FF'>=</font> skip_input_data;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>resync_to_restart <font color='#5555FF'>=</font> jpeg_resync_to_restart; <font color='#009900'>/* use default method */</font>
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>term_source <font color='#5555FF'>=</font> term_source;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>bytes_in_buffer <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>size_t</u></font><font face='Lucida Console'>)</font> insize;
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src<font color='#5555FF'>-</font><font color='#5555FF'>></font>next_input_byte <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JOCTET <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> inbuffer;
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<b>}</b>
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</pre></body></html> |
