#include <stdio.h>#include <stdlib.h>#ifndef __ECOS#include <memory.h># include <malloc.h>#endif#include <setjmp.h>#include "jpeglib.h"#include "jpg.h"struct my_error_mgr {  struct jpeg_error_mgr pub;	/* "public" fields */  jmp_buf setjmp_buffer;	/* for return to caller */};typedef struct my_error_mgr * my_error_ptr;METHODDEF(void)my_error_exit (j_common_ptr cinfo){  /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */  my_error_ptr myerr = (my_error_ptr) cinfo->err;  /* Always display the message. */  /* We could postpone this until after returning, if we chose. */  (*cinfo->err->output_message)(cinfo);  /* Return control to the setjmp point */  longjmp(myerr->setjmp_buffer, 1);}int unpack_jpg(jpg_info_t* jinfo){    struct jpeg_decompress_struct cinfo;    /* We use our private extension JPEG error handler.     * Note that this struct must live as long as the main JPEG parameter     * struct, to avoid dangling-pointer problems.     */    struct my_error_mgr jerr;    /* More stuff */    JSAMPARRAY buffer;		/* Output row buffer */    int row_stride;		    /* physical row width in output buffer */        cinfo.err = jpeg_std_error(&jerr.pub);    jerr.pub.error_exit = my_error_exit;    jpeg_create_decompress(&cinfo);    jpeg_memory_src(&cinfo, jinfo->jpg_buffer, jinfo->jpg_buffer_length);    jpeg_read_header(&cinfo, TRUE);    jpeg_start_decompress(&cinfo);    /* JSAMPLEs per row in output buffer */    row_stride = cinfo.output_width * cinfo.output_components;    /* Make a one-row-high sample array that will go away when done with image */    buffer = (*cinfo.mem->alloc_sarray)	    ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);    jinfo->width=cinfo.output_width;    jinfo->height=cinfo.output_height;    jinfo->jpg_surface=(unsigned char*)malloc(jinfo->width*jinfo->height*3);    while (cinfo.output_scanline < cinfo.output_height) {        unsigned char* temp_src_buffer;        unsigned char* temp_des_buffer;        jpeg_read_scanlines(&cinfo, buffer, 1);        temp_src_buffer=(unsigned char*)(*buffer);        temp_des_buffer=jinfo->jpg_surface+jinfo->width*(cinfo.output_scanline-1)*3;        memcpy(temp_des_buffer,temp_src_buffer,row_stride);    }    jpeg_finish_decompress(&cinfo);    jpeg_destroy_decompress(&cinfo);    return 0;}int destroy_jpg(jpg_info_t* jinfo){    if (jinfo->jpg_surface!=NULL) {        free(jinfo->jpg_surface);    }    return 0;}#ifndef EXIT_FAILURE		/* define exit() codes if not provided */#define EXIT_FAILURE  1#endif/* * Create the message string table. * We do this from the master message list in jerror.h by re-reading * jerror.h with a suitable definition for macro JMESSAGE. * The message table is made an external symbol just in case any applications * want to refer to it directly. */#define JMESSAGE(code,string)	string ,const char * const jpeg_std_message_table[] = {#include "jpg.h"  NULL};/* * Error exit handler: must not return to caller. * * Applications may override this if they want to get control back after * an error.  Typically one would longjmp somewhere instead of exiting. * The setjmp buffer can be made a private field within an expanded error * handler object.  Note that the info needed to generate an error message * is stored in the error object, so you can generate the message now or * later, at your convenience. * You should make sure that the JPEG object is cleaned up (with jpeg_abort * or jpeg_destroy) at some point. */METHODDEF(void)error_exit (j_common_ptr cinfo){  /* Always display the message */  (*cinfo->err->output_message) (cinfo);  /* Let the memory manager delete any temp files before we die */  jpeg_destroy(cinfo);}/* * Actual output of an error or trace message. * Applications may override this method to send JPEG messages somewhere * other than stderr. */METHODDEF(void)output_message (j_common_ptr cinfo){  char buffer[JMSG_LENGTH_MAX];  /* Create the message */  (*cinfo->err->format_message) (cinfo, buffer);  /* Send it to stderr, adding a newline */  fprintf(stderr, "%s\n", buffer);}/* * Decide whether to emit a trace or warning message. * msg_level is one of: *   -1: recoverable corrupt-data warning, may want to abort. *    0: important advisory messages (always display to user). *    1: first level of tracing detail. *    2,3,...: successively more detailed tracing messages. * An application might override this method if it wanted to abort on warnings * or change the policy about which messages to display. */METHODDEF(void)emit_message (j_common_ptr cinfo, int msg_level){  struct jpeg_error_mgr * err = cinfo->err;  if (msg_level < 0) {    /* It's a warning message.  Since corrupt files may generate many warnings,     * the policy implemented here is to show only the first warning,     * unless trace_level >= 3.     */    if (err->num_warnings == 0 || err->trace_level >= 3)      (*err->output_message) (cinfo);    /* Always count warnings in num_warnings. */    err->num_warnings++;  } else {    /* It's a trace message.  Show it if trace_level >= msg_level. */    if (err->trace_level >= msg_level)      (*err->output_message) (cinfo);  }}/* * Format a message string for the most recent JPEG error or message. * The message is stored into buffer, which should be at least JMSG_LENGTH_MAX * characters.  Note that no '\n' character is added to the string. * Few applications should need to override this method. */METHODDEF(void)format_message (j_common_ptr cinfo, char * buffer){  struct jpeg_error_mgr * err = cinfo->err;  int msg_code = err->msg_code;  const char * msgtext = NULL;  const char * msgptr;  char ch;  boolean isstring;  /* Look up message string in proper table */  if (msg_code > 0 && msg_code <= err->last_jpeg_message) {    msgtext = err->jpeg_message_table[msg_code];  } else if (err->addon_message_table != NULL &&	     msg_code >= err->first_addon_message &&	     msg_code <= err->last_addon_message) {    msgtext = err->addon_message_table[msg_code - err->first_addon_message];  }  /* Defend against bogus message number */  if (msgtext == NULL) {    err->msg_parm.i[0] = msg_code;    msgtext = err->jpeg_message_table[0];  }  /* Check for string parameter, as indicated by %s in the message text */  isstring = FALSE;  msgptr = msgtext;  while ((ch = *msgptr++) != '\0') {    if (ch == '%') {      if (*msgptr == 's') isstring = TRUE;      break;    }  }  /* Format the message into the passed buffer */  if (isstring)    sprintf(buffer, msgtext, err->msg_parm.s);  else    sprintf(buffer, msgtext,	    err->msg_parm.i[0], err->msg_parm.i[1],	    err->msg_parm.i[2], err->msg_parm.i[3],	    err->msg_parm.i[4], err->msg_parm.i[5],	    err->msg_parm.i[6], err->msg_parm.i[7]);}/* * Reset error state variables at start of a new image. * This is called during compression startup to reset trace/error * processing to default state, without losing any application-specific * method pointers.  An application might possibly want to override * this method if it has additional error processing state. */METHODDEF(void)reset_error_mgr (j_common_ptr cinfo){  cinfo->err->num_warnings = 0;  /* trace_level is not reset since it is an application-supplied parameter */  cinfo->err->msg_code = 0;	/* may be useful as a flag for "no error" */}/* * Fill in the standard error-handling methods in a jpeg_error_mgr object. * Typical call is: *	struct jpeg_compress_struct cinfo; *	struct jpeg_error_mgr err; * *	cinfo.err = jpeg_std_error(&err); * after which the application may override some of the methods. */GLOBAL(struct jpeg_error_mgr *)jpeg_std_error (struct jpeg_error_mgr * err){  err->error_exit = error_exit;  err->emit_message = emit_message;  err->output_message = output_message;  err->format_message = format_message;  err->reset_error_mgr = reset_error_mgr;  err->trace_level = 0;		/* default = no tracing */  err->num_warnings = 0;	/* no warnings emitted yet */  err->msg_code = 0;		/* may be useful as a flag for "no error" */  /* Initialize message table pointers */  err->jpeg_message_table = jpeg_std_message_table;  err->last_jpeg_message = (int) JMSG_LASTMSGCODE - 1;  err->addon_message_table = NULL;  err->first_addon_message = 0;	/* for safety */  err->last_addon_message = 0;  return err;}#define JPEG_INTERNALS#include "jpegint.h"#define AM_MEMORY_MANAGER	/* we define jvirt_Xarray_control structs */#ifndef NO_GETENV#ifndef HAVE_STDLIB_H		/* <stdlib.h> should declare getenv() */extern char * getenv JPP((const char * name));#endif#endif/* * Some important notes: *   The allocation routines provided here must never return NULL. *   They should exit to error_exit if unsuccessful. * *   It's not a good idea to try to merge the sarray and barray routines, *   even though they are textually almost the same, because samples are *   usually stored as bytes while coefficients are shorts or ints.  Thus, *   in machines where byte pointers have a different representation from *   word pointers, the resulting machine code could not be the same. *//* * Many machines require storage alignment: longs must start on 4-byte * boundaries, doubles on 8-byte boundaries, etc.  On such machines, malloc() * always returns pointers that are multiples of the worst-case alignment * requirement, and we had better do so too. * There isn't any really portable way to determine the worst-case alignment * requirement.  This module assumes that the alignment requirement is * multiples of sizeof(ALIGN_TYPE). * By default, we define ALIGN_TYPE as double.  This is necessary on some * workstations (where doubles really do need 8-byte alignment) and will work * fine on nearly everything.  If your machine has lesser alignment needs, * you can save a few bytes by making ALIGN_TYPE smaller. * The only place I know of where this will NOT work is certain Macintosh * 680x0 compilers that define double as a 10-byte IEEE extended float. * Doing 10-byte alignment is counterproductive because longwords won't be * aligned well.  Put "#define ALIGN_TYPE long" in jconfig.h if you have * such a compiler. */#ifndef ALIGN_TYPE		/* so can override from jconfig.h */#define ALIGN_TYPE  double#endif/* * We allocate objects from "pools", where each pool is gotten with a single * request to jpeg_get_small() or jpeg_get_large().  There is no per-object * overhead within a pool, except for alignment padding.  Each pool has a * header with a link to the next pool of the same class. * Small and large pool headers are identical except that the latter's * link pointer must be FAR on 80x86 machines. * Notice that the "real" header fields are union'ed with a dummy ALIGN_TYPE * field.  This forces the compiler to make SIZEOF(small_pool_hdr) a multiple * of the alignment requirement of ALIGN_TYPE. */typedef union small_pool_struct * small_pool_ptr;typedef union small_pool_struct {  struct {    small_pool_ptr next;	/* next in list of pools */    size_t bytes_used;		/* how many bytes already used within pool */    size_t bytes_left;		/* bytes still available in this pool */  } hdr;  ALIGN_TYPE dummy;		/* included in union to ensure alignment */} small_pool_hdr;typedef union large_pool_struct * large_pool_ptr;typedef union large_pool_struct {  struct {    large_pool_ptr next;	/* next in list of pools */