#if !defined(_FX_JPEG_TURBO_) | |
/* | |
* jdmarker.c | |
* | |
* Copyright (C) 1991-1998, Thomas G. Lane. | |
* This file is part of the Independent JPEG Group's software. | |
* For conditions of distribution and use, see the accompanying README file. | |
* | |
* This file contains routines to decode JPEG datastream markers. | |
* Most of the complexity arises from our desire to support input | |
* suspension: if not all of the data for a marker is available, | |
* we must exit back to the application. On resumption, we reprocess | |
* the marker. | |
*/ | |
#define JPEG_INTERNALS | |
#include "jinclude.h" | |
#include "jpeglib.h" | |
typedef enum { /* JPEG marker codes */ | |
M_SOF0 = 0xc0, | |
M_SOF1 = 0xc1, | |
M_SOF2 = 0xc2, | |
M_SOF3 = 0xc3, | |
M_SOF5 = 0xc5, | |
M_SOF6 = 0xc6, | |
M_SOF7 = 0xc7, | |
M_JPG = 0xc8, | |
M_SOF9 = 0xc9, | |
M_SOF10 = 0xca, | |
M_SOF11 = 0xcb, | |
M_SOF13 = 0xcd, | |
M_SOF14 = 0xce, | |
M_SOF15 = 0xcf, | |
M_DHT = 0xc4, | |
M_DAC = 0xcc, | |
M_RST0 = 0xd0, | |
M_RST1 = 0xd1, | |
M_RST2 = 0xd2, | |
M_RST3 = 0xd3, | |
M_RST4 = 0xd4, | |
M_RST5 = 0xd5, | |
M_RST6 = 0xd6, | |
M_RST7 = 0xd7, | |
M_SOI = 0xd8, | |
M_EOI = 0xd9, | |
M_SOS = 0xda, | |
M_DQT = 0xdb, | |
M_DNL = 0xdc, | |
M_DRI = 0xdd, | |
M_DHP = 0xde, | |
M_EXP = 0xdf, | |
M_APP0 = 0xe0, | |
M_APP1 = 0xe1, | |
M_APP2 = 0xe2, | |
M_APP3 = 0xe3, | |
M_APP4 = 0xe4, | |
M_APP5 = 0xe5, | |
M_APP6 = 0xe6, | |
M_APP7 = 0xe7, | |
M_APP8 = 0xe8, | |
M_APP9 = 0xe9, | |
M_APP10 = 0xea, | |
M_APP11 = 0xeb, | |
M_APP12 = 0xec, | |
M_APP13 = 0xed, | |
M_APP14 = 0xee, | |
M_APP15 = 0xef, | |
M_JPG0 = 0xf0, | |
M_JPG13 = 0xfd, | |
M_COM = 0xfe, | |
M_TEM = 0x01, | |
M_ERROR = 0x100 | |
} JPEG_MARKER; | |
/* Private state */ | |
typedef struct { | |
struct jpeg_marker_reader pub; /* public fields */ | |
/* Application-overridable marker processing methods */ | |
jpeg_marker_parser_method process_COM; | |
jpeg_marker_parser_method process_APPn[16]; | |
/* Limit on marker data length to save for each marker type */ | |
unsigned int length_limit_COM; | |
unsigned int length_limit_APPn[16]; | |
/* Status of COM/APPn marker saving */ | |
jpeg_saved_marker_ptr cur_marker; /* NULL if not processing a marker */ | |
unsigned int bytes_read; /* data bytes read so far in marker */ | |
/* Note: cur_marker is not linked into marker_list until it's all read. */ | |
} my_marker_reader; | |
typedef my_marker_reader * my_marker_ptr; | |
/* | |
* Macros for fetching data from the data source module. | |
* | |
* At all times, cinfo->src->next_input_byte and ->bytes_in_buffer reflect | |
* the current restart point; we update them only when we have reached a | |
* suitable place to restart if a suspension occurs. | |
*/ | |
/* Declare and initialize local copies of input pointer/count */ | |
#define INPUT_VARS(cinfo) \ | |
struct jpeg_source_mgr * datasrc = (cinfo)->src; \ | |
const JOCTET * next_input_byte = datasrc->next_input_byte; \ | |
size_t bytes_in_buffer = datasrc->bytes_in_buffer | |
/* Unload the local copies --- do this only at a restart boundary */ | |
#define INPUT_SYNC(cinfo) \ | |
( datasrc->next_input_byte = next_input_byte, \ | |
datasrc->bytes_in_buffer = bytes_in_buffer ) | |
/* Reload the local copies --- used only in MAKE_BYTE_AVAIL */ | |
#define INPUT_RELOAD(cinfo) \ | |
( next_input_byte = datasrc->next_input_byte, \ | |
bytes_in_buffer = datasrc->bytes_in_buffer ) | |
/* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available. | |
* Note we do *not* do INPUT_SYNC before calling fill_input_buffer, | |
* but we must reload the local copies after a successful fill. | |
*/ | |
#define MAKE_BYTE_AVAIL(cinfo,action) \ | |
if (bytes_in_buffer == 0) { \ | |
if (! (*datasrc->fill_input_buffer) (cinfo)) \ | |
{ action; } \ | |
INPUT_RELOAD(cinfo); \ | |
} | |
/* Read a byte into variable V. | |
* If must suspend, take the specified action (typically "return FALSE"). | |
*/ | |
#define INPUT_BYTE(cinfo,V,action) \ | |
MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \ | |
bytes_in_buffer--; \ | |
V = GETJOCTET(*next_input_byte++); ) | |
/* As above, but read two bytes interpreted as an unsigned 16-bit integer. | |
* V should be declared unsigned int or perhaps INT32. | |
*/ | |
#define INPUT_2BYTES(cinfo,V,action) \ | |
MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \ | |
bytes_in_buffer--; \ | |
V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \ | |
MAKE_BYTE_AVAIL(cinfo,action); \ | |
bytes_in_buffer--; \ | |
V += GETJOCTET(*next_input_byte++); ) | |
/* | |
* Routines to process JPEG markers. | |
* | |
* Entry condition: JPEG marker itself has been read and its code saved | |
* in cinfo->unread_marker; input restart point is just after the marker. | |
* | |
* Exit: if return TRUE, have read and processed any parameters, and have | |
* updated the restart point to point after the parameters. | |
* If return FALSE, was forced to suspend before reaching end of | |
* marker parameters; restart point has not been moved. Same routine | |
* will be called again after application supplies more input data. | |
* | |
* This approach to suspension assumes that all of a marker's parameters | |
* can fit into a single input bufferload. This should hold for "normal" | |
* markers. Some COM/APPn markers might have large parameter segments | |
* that might not fit. If we are simply dropping such a marker, we use | |
* skip_input_data to get past it, and thereby put the problem on the | |
* source manager's shoulders. If we are saving the marker's contents | |
* into memory, we use a slightly different convention: when forced to | |
* suspend, the marker processor updates the restart point to the end of | |
* what it's consumed (ie, the end of the buffer) before returning FALSE. | |
* On resumption, cinfo->unread_marker still contains the marker code, | |
* but the data source will point to the next chunk of marker data. | |
* The marker processor must retain internal state to deal with this. | |
* | |
* Note that we don't bother to avoid duplicate trace messages if a | |
* suspension occurs within marker parameters. Other side effects | |
* require more care. | |
*/ | |
LOCAL(boolean) | |
get_soi (j_decompress_ptr cinfo) | |
/* Process an SOI marker */ | |
{ | |
int i; | |
TRACEMS(cinfo, 1, JTRC_SOI); | |
if (cinfo->marker->saw_SOI) | |
ERREXIT(cinfo, JERR_SOI_DUPLICATE); | |
/* Reset all parameters that are defined to be reset by SOI */ | |
for (i = 0; i < NUM_ARITH_TBLS; i++) { | |
cinfo->arith_dc_L[i] = 0; | |
cinfo->arith_dc_U[i] = 1; | |
cinfo->arith_ac_K[i] = 5; | |
} | |
cinfo->restart_interval = 0; | |
/* Set initial assumptions for colorspace etc */ | |
cinfo->jpeg_color_space = JCS_UNKNOWN; | |
cinfo->CCIR601_sampling = FALSE; /* Assume non-CCIR sampling??? */ | |
cinfo->saw_JFIF_marker = FALSE; | |
cinfo->JFIF_major_version = 1; /* set default JFIF APP0 values */ | |
cinfo->JFIF_minor_version = 1; | |
cinfo->density_unit = 0; | |
cinfo->X_density = 1; | |
cinfo->Y_density = 1; | |
cinfo->saw_Adobe_marker = FALSE; | |
cinfo->Adobe_transform = 0; | |
cinfo->marker->saw_SOI = TRUE; | |
return TRUE; | |
} | |
LOCAL(boolean) | |
get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith) | |
/* Process a SOFn marker */ | |
{ | |
INT32 length; | |
int c, ci; | |
jpeg_component_info * compptr; | |
/* LiuSunliang added 20111209 */ | |
JDIMENSION image_width, image_height; | |
INPUT_VARS(cinfo); | |
cinfo->progressive_mode = is_prog; | |
cinfo->arith_code = is_arith; | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
INPUT_BYTE(cinfo, cinfo->data_precision, return FALSE); | |
INPUT_2BYTES(cinfo, image_height, return FALSE); | |
INPUT_2BYTES(cinfo, image_width, return FALSE); | |
INPUT_BYTE(cinfo, cinfo->num_components, return FALSE); | |
if (image_width <= JPEG_MAX_DIMENSION) | |
cinfo->image_width = image_width; | |
if (image_height <= JPEG_MAX_DIMENSION) | |
cinfo->image_height = image_height; | |
length -= 8; | |
TRACEMS4(cinfo, 1, JTRC_SOF, cinfo->unread_marker, | |
(int) cinfo->image_width, (int) cinfo->image_height, | |
cinfo->num_components); | |
if (cinfo->marker->saw_SOF) | |
ERREXIT(cinfo, JERR_SOF_DUPLICATE); | |
/* We don't support files in which the image height is initially specified */ | |
/* as 0 and is later redefined by DNL. As long as we have to check that, */ | |
/* might as well have a general sanity check. */ | |
if (cinfo->image_height <= 0 || cinfo->image_width <= 0 | |
|| cinfo->num_components <= 0) | |
ERREXIT(cinfo, JERR_EMPTY_IMAGE); | |
if (length != (cinfo->num_components * 3)) | |
ERREXIT(cinfo, JERR_BAD_LENGTH); | |
if (cinfo->comp_info == NULL) /* do only once, even if suspend */ | |
cinfo->comp_info = (jpeg_component_info *) (*cinfo->mem->alloc_small) | |
((j_common_ptr) cinfo, JPOOL_IMAGE, | |
cinfo->num_components * SIZEOF(jpeg_component_info)); | |
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | |
ci++, compptr++) { | |
compptr->component_index = ci; | |
INPUT_BYTE(cinfo, compptr->component_id, return FALSE); | |
/* XYQ 2008-03-25: Adobe CMYK JPEG has serious flaw: the K channel has same component id as C channel */ | |
{ | |
int i; | |
for (i = 0; i < ci; i ++) | |
if (compptr->component_id == cinfo->comp_info[i].component_id) break; | |
if (i < ci) | |
/* Found the error! We replace the id with something unlikely used elsewhere */ | |
compptr->component_id += 0xf0; | |
} | |
/* end of modification */ | |
INPUT_BYTE(cinfo, c, return FALSE); | |
compptr->h_samp_factor = (c >> 4) & 15; | |
compptr->v_samp_factor = (c ) & 15; | |
INPUT_BYTE(cinfo, compptr->quant_tbl_no, return FALSE); | |
TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT, | |
compptr->component_id, compptr->h_samp_factor, | |
compptr->v_samp_factor, compptr->quant_tbl_no); | |
} | |
cinfo->marker->saw_SOF = TRUE; | |
INPUT_SYNC(cinfo); | |
return TRUE; | |
} | |
LOCAL(boolean) | |
get_sos (j_decompress_ptr cinfo) | |
/* Process a SOS marker */ | |
{ | |
INT32 length; | |
int i, ci, n, c, cc; | |
jpeg_component_info * compptr; | |
INPUT_VARS(cinfo); | |
if (! cinfo->marker->saw_SOF) | |
ERREXIT(cinfo, JERR_SOS_NO_SOF); | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
INPUT_BYTE(cinfo, n, return FALSE); /* Number of components */ | |
TRACEMS1(cinfo, 1, JTRC_SOS, n); | |
if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN) | |
ERREXIT(cinfo, JERR_BAD_LENGTH); | |
cinfo->comps_in_scan = n; | |
/* Collect the component-spec parameters */ | |
for (i = 0; i < n; i++) { | |
INPUT_BYTE(cinfo, cc, return FALSE); | |
INPUT_BYTE(cinfo, c, return FALSE); | |
/* XYQ 2008-03-25: Adobe CMYK JPEG has serious flaw: the K channel has same component id as C channel */ | |
{ | |
int j; | |
for (j = 0; j < i; j ++) | |
if (cc == cinfo->cur_comp_info[j]->component_id) break; | |
if (j < i) | |
/* found the error! */ | |
cc += 0xf0; | |
} | |
/* end of modification */ | |
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; | |
ci++, compptr++) { | |
if (cc == compptr->component_id) | |
goto id_found; | |
} | |
ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc); | |
id_found: | |
cinfo->cur_comp_info[i] = compptr; | |
compptr->dc_tbl_no = (c >> 4) & 15; | |
compptr->ac_tbl_no = (c ) & 15; | |
TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc, | |
compptr->dc_tbl_no, compptr->ac_tbl_no); | |
/* This CSi (cc) should differ from the previous CSi */ | |
for (ci = 0; ci < i; ci++) { | |
if (cinfo->cur_comp_info[ci] == compptr) | |
ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc); | |
} | |
} | |
/* Collect the additional scan parameters Ss, Se, Ah/Al. */ | |
INPUT_BYTE(cinfo, c, return FALSE); | |
cinfo->Ss = c; | |
INPUT_BYTE(cinfo, c, return FALSE); | |
cinfo->Se = c; | |
INPUT_BYTE(cinfo, c, return FALSE); | |
cinfo->Ah = (c >> 4) & 15; | |
cinfo->Al = (c ) & 15; | |
TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo->Ss, cinfo->Se, | |
cinfo->Ah, cinfo->Al); | |
/* Prepare to scan data & restart markers */ | |
cinfo->marker->next_restart_num = 0; | |
/* Count another SOS marker */ | |
cinfo->input_scan_number++; | |
INPUT_SYNC(cinfo); | |
return TRUE; | |
} | |
#ifdef D_ARITH_CODING_SUPPORTED | |
LOCAL(boolean) | |
get_dac (j_decompress_ptr cinfo) | |
/* Process a DAC marker */ | |
{ | |
INT32 length; | |
int index, val; | |
INPUT_VARS(cinfo); | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
length -= 2; | |
while (length > 0) { | |
INPUT_BYTE(cinfo, index, return FALSE); | |
INPUT_BYTE(cinfo, val, return FALSE); | |
length -= 2; | |
TRACEMS2(cinfo, 1, JTRC_DAC, index, val); | |
if (index < 0 || index >= (2*NUM_ARITH_TBLS)) | |
ERREXIT1(cinfo, JERR_DAC_INDEX, index); | |
if (index >= NUM_ARITH_TBLS) { /* define AC table */ | |
cinfo->arith_ac_K[index-NUM_ARITH_TBLS] = (UINT8) val; | |
} else { /* define DC table */ | |
cinfo->arith_dc_L[index] = (UINT8) (val & 0x0F); | |
cinfo->arith_dc_U[index] = (UINT8) (val >> 4); | |
if (cinfo->arith_dc_L[index] > cinfo->arith_dc_U[index]) | |
ERREXIT1(cinfo, JERR_DAC_VALUE, val); | |
} | |
} | |
if (length != 0) | |
ERREXIT(cinfo, JERR_BAD_LENGTH); | |
INPUT_SYNC(cinfo); | |
return TRUE; | |
} | |
#else /* ! D_ARITH_CODING_SUPPORTED */ | |
#define get_dac(cinfo) skip_variable(cinfo) | |
#endif /* D_ARITH_CODING_SUPPORTED */ | |
LOCAL(boolean) | |
get_dht (j_decompress_ptr cinfo) | |
/* Process a DHT marker */ | |
{ | |
INT32 length; | |
UINT8 bits[17]; | |
UINT8 huffval[256]; | |
int i, index, count; | |
JHUFF_TBL **htblptr; | |
INPUT_VARS(cinfo); | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
length -= 2; | |
while (length > 16) { | |
INPUT_BYTE(cinfo, index, return FALSE); | |
TRACEMS1(cinfo, 1, JTRC_DHT, index); | |
bits[0] = 0; | |
count = 0; | |
for (i = 1; i <= 16; i++) { | |
INPUT_BYTE(cinfo, bits[i], return FALSE); | |
count += bits[i]; | |
} | |
length -= 1 + 16; | |
TRACEMS8(cinfo, 2, JTRC_HUFFBITS, | |
bits[1], bits[2], bits[3], bits[4], | |
bits[5], bits[6], bits[7], bits[8]); | |
TRACEMS8(cinfo, 2, JTRC_HUFFBITS, | |
bits[9], bits[10], bits[11], bits[12], | |
bits[13], bits[14], bits[15], bits[16]); | |
/* Here we just do minimal validation of the counts to avoid walking | |
* off the end of our table space. jdhuff.c will check more carefully. | |
*/ | |
if (count > 256 || ((INT32) count) > length) | |
ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); | |
for (i = 0; i < count; i++) | |
INPUT_BYTE(cinfo, huffval[i], return FALSE); | |
length -= count; | |
if (index & 0x10) { /* AC table definition */ | |
index -= 0x10; | |
htblptr = &cinfo->ac_huff_tbl_ptrs[index]; | |
} else { /* DC table definition */ | |
htblptr = &cinfo->dc_huff_tbl_ptrs[index]; | |
} | |
if (index < 0 || index >= NUM_HUFF_TBLS) | |
ERREXIT1(cinfo, JERR_DHT_INDEX, index); | |
if (*htblptr == NULL) | |
*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo); | |
MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits)); | |
MEMCOPY((*htblptr)->huffval, huffval, SIZEOF((*htblptr)->huffval)); | |
} | |
if (length != 0) | |
ERREXIT(cinfo, JERR_BAD_LENGTH); | |
INPUT_SYNC(cinfo); | |
return TRUE; | |
} | |
LOCAL(boolean) | |
get_dqt (j_decompress_ptr cinfo) | |
/* Process a DQT marker */ | |
{ | |
INT32 length; | |
int n, i, prec; | |
unsigned int tmp; | |
JQUANT_TBL *quant_ptr; | |
INPUT_VARS(cinfo); | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
length -= 2; | |
while (length > 0) { | |
INPUT_BYTE(cinfo, n, return FALSE); | |
prec = n >> 4; | |
n &= 0x0F; | |
TRACEMS2(cinfo, 1, JTRC_DQT, n, prec); | |
if (n >= NUM_QUANT_TBLS) | |
ERREXIT1(cinfo, JERR_DQT_INDEX, n); | |
if (cinfo->quant_tbl_ptrs[n] == NULL) | |
cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo); | |
quant_ptr = cinfo->quant_tbl_ptrs[n]; | |
for (i = 0; i < DCTSIZE2; i++) { | |
if (prec) | |
INPUT_2BYTES(cinfo, tmp, return FALSE); | |
else | |
INPUT_BYTE(cinfo, tmp, return FALSE); | |
/* We convert the zigzag-order table to natural array order. */ | |
quant_ptr->quantval[jpeg_natural_order[i]] = (UINT16) tmp; | |
} | |
if (cinfo->err->trace_level >= 2) { | |
for (i = 0; i < DCTSIZE2; i += 8) { | |
TRACEMS8(cinfo, 2, JTRC_QUANTVALS, | |
quant_ptr->quantval[i], quant_ptr->quantval[i+1], | |
quant_ptr->quantval[i+2], quant_ptr->quantval[i+3], | |
quant_ptr->quantval[i+4], quant_ptr->quantval[i+5], | |
quant_ptr->quantval[i+6], quant_ptr->quantval[i+7]); | |
} | |
} | |
length -= DCTSIZE2+1; | |
if (prec) length -= DCTSIZE2; | |
} | |
if (length != 0) | |
ERREXIT(cinfo, JERR_BAD_LENGTH); | |
INPUT_SYNC(cinfo); | |
return TRUE; | |
} | |
LOCAL(boolean) | |
get_dri (j_decompress_ptr cinfo) | |
/* Process a DRI marker */ | |
{ | |
INT32 length; | |
unsigned int tmp; | |
INPUT_VARS(cinfo); | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
if (length != 4) | |
ERREXIT(cinfo, JERR_BAD_LENGTH); | |
INPUT_2BYTES(cinfo, tmp, return FALSE); | |
TRACEMS1(cinfo, 1, JTRC_DRI, tmp); | |
cinfo->restart_interval = tmp; | |
INPUT_SYNC(cinfo); | |
return TRUE; | |
} | |
/* | |
* Routines for processing APPn and COM markers. | |
* These are either saved in memory or discarded, per application request. | |
* APP0 and APP14 are specially checked to see if they are | |
* JFIF and Adobe markers, respectively. | |
*/ | |
#define APP0_DATA_LEN 14 /* Length of interesting data in APP0 */ | |
#define APP14_DATA_LEN 12 /* Length of interesting data in APP14 */ | |
#define APPN_DATA_LEN 14 /* Must be the largest of the above!! */ | |
LOCAL(void) | |
examine_app0 (j_decompress_ptr cinfo, JOCTET FAR * data, | |
unsigned int datalen, INT32 remaining) | |
/* Examine first few bytes from an APP0. | |
* Take appropriate action if it is a JFIF marker. | |
* datalen is # of bytes at data[], remaining is length of rest of marker data. | |
*/ | |
{ | |
INT32 totallen = (INT32) datalen + remaining; | |
if (datalen >= APP0_DATA_LEN && | |
GETJOCTET(data[0]) == 0x4A && | |
GETJOCTET(data[1]) == 0x46 && | |
GETJOCTET(data[2]) == 0x49 && | |
GETJOCTET(data[3]) == 0x46 && | |
GETJOCTET(data[4]) == 0) { | |
/* Found JFIF APP0 marker: save info */ | |
cinfo->saw_JFIF_marker = TRUE; | |
cinfo->JFIF_major_version = GETJOCTET(data[5]); | |
cinfo->JFIF_minor_version = GETJOCTET(data[6]); | |
cinfo->density_unit = GETJOCTET(data[7]); | |
cinfo->X_density = (GETJOCTET(data[8]) << 8) + GETJOCTET(data[9]); | |
cinfo->Y_density = (GETJOCTET(data[10]) << 8) + GETJOCTET(data[11]); | |
/* Check version. | |
* Major version must be 1, anything else signals an incompatible change. | |
* (We used to treat this as an error, but now it's a nonfatal warning, | |
* because some bozo at Hijaak couldn't read the spec.) | |
* Minor version should be 0..2, but process anyway if newer. | |
*/ | |
if (cinfo->JFIF_major_version != 1) | |
WARNMS2(cinfo, JWRN_JFIF_MAJOR, | |
cinfo->JFIF_major_version, cinfo->JFIF_minor_version); | |
/* Generate trace messages */ | |
TRACEMS5(cinfo, 1, JTRC_JFIF, | |
cinfo->JFIF_major_version, cinfo->JFIF_minor_version, | |
cinfo->X_density, cinfo->Y_density, cinfo->density_unit); | |
/* Validate thumbnail dimensions and issue appropriate messages */ | |
if (GETJOCTET(data[12]) | GETJOCTET(data[13])) | |
TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL, | |
GETJOCTET(data[12]), GETJOCTET(data[13])); | |
totallen -= APP0_DATA_LEN; | |
if (totallen != | |
((INT32)GETJOCTET(data[12]) * (INT32)GETJOCTET(data[13]) * (INT32) 3)) | |
TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int) totallen); | |
} else if (datalen >= 6 && | |
GETJOCTET(data[0]) == 0x4A && | |
GETJOCTET(data[1]) == 0x46 && | |
GETJOCTET(data[2]) == 0x58 && | |
GETJOCTET(data[3]) == 0x58 && | |
GETJOCTET(data[4]) == 0) { | |
/* Found JFIF "JFXX" extension APP0 marker */ | |
/* The library doesn't actually do anything with these, | |
* but we try to produce a helpful trace message. | |
*/ | |
switch (GETJOCTET(data[5])) { | |
case 0x10: | |
TRACEMS1(cinfo, 1, JTRC_THUMB_JPEG, (int) totallen); | |
break; | |
case 0x11: | |
TRACEMS1(cinfo, 1, JTRC_THUMB_PALETTE, (int) totallen); | |
break; | |
case 0x13: | |
TRACEMS1(cinfo, 1, JTRC_THUMB_RGB, (int) totallen); | |
break; | |
default: | |
TRACEMS2(cinfo, 1, JTRC_JFIF_EXTENSION, | |
GETJOCTET(data[5]), (int) totallen); | |
break; | |
} | |
} else { | |
/* Start of APP0 does not match "JFIF" or "JFXX", or too short */ | |
TRACEMS1(cinfo, 1, JTRC_APP0, (int) totallen); | |
} | |
} | |
LOCAL(void) | |
examine_app14 (j_decompress_ptr cinfo, JOCTET FAR * data, | |
unsigned int datalen, INT32 remaining) | |
/* Examine first few bytes from an APP14. | |
* Take appropriate action if it is an Adobe marker. | |
* datalen is # of bytes at data[], remaining is length of rest of marker data. | |
*/ | |
{ | |
unsigned int version, flags0, flags1, transform; | |
if (datalen >= APP14_DATA_LEN && | |
GETJOCTET(data[0]) == 0x41 && | |
GETJOCTET(data[1]) == 0x64 && | |
GETJOCTET(data[2]) == 0x6F && | |
GETJOCTET(data[3]) == 0x62 && | |
GETJOCTET(data[4]) == 0x65) { | |
/* Found Adobe APP14 marker */ | |
version = (GETJOCTET(data[5]) << 8) + GETJOCTET(data[6]); | |
flags0 = (GETJOCTET(data[7]) << 8) + GETJOCTET(data[8]); | |
flags1 = (GETJOCTET(data[9]) << 8) + GETJOCTET(data[10]); | |
transform = GETJOCTET(data[11]); | |
TRACEMS4(cinfo, 1, JTRC_ADOBE, version, flags0, flags1, transform); | |
cinfo->saw_Adobe_marker = TRUE; | |
cinfo->Adobe_transform = (UINT8) transform; | |
} else { | |
/* Start of APP14 does not match "Adobe", or too short */ | |
TRACEMS1(cinfo, 1, JTRC_APP14, (int) (datalen + remaining)); | |
} | |
} | |
METHODDEF(boolean) | |
get_interesting_appn (j_decompress_ptr cinfo) | |
/* Process an APP0 or APP14 marker without saving it */ | |
{ | |
INT32 length; | |
JOCTET b[APPN_DATA_LEN]; | |
unsigned int i, numtoread; | |
INPUT_VARS(cinfo); | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
length -= 2; | |
/* get the interesting part of the marker data */ | |
if (length >= APPN_DATA_LEN) | |
numtoread = APPN_DATA_LEN; | |
else if (length > 0) | |
numtoread = (unsigned int) length; | |
else | |
numtoread = 0; | |
for (i = 0; i < numtoread; i++) | |
INPUT_BYTE(cinfo, b[i], return FALSE); | |
length -= numtoread; | |
/* process it */ | |
switch (cinfo->unread_marker) { | |
case M_APP0: | |
examine_app0(cinfo, (JOCTET FAR *) b, numtoread, length); | |
break; | |
case M_APP14: | |
examine_app14(cinfo, (JOCTET FAR *) b, numtoread, length); | |
break; | |
default: | |
/* can't get here unless jpeg_save_markers chooses wrong processor */ | |
ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker); | |
break; | |
} | |
/* skip any remaining data -- could be lots */ | |
INPUT_SYNC(cinfo); | |
if (length > 0) | |
(*cinfo->src->skip_input_data) (cinfo, (long) length); | |
return TRUE; | |
} | |
#ifdef SAVE_MARKERS_SUPPORTED | |
METHODDEF(boolean) | |
save_marker (j_decompress_ptr cinfo) | |
/* Save an APPn or COM marker into the marker list */ | |
{ | |
my_marker_ptr marker = (my_marker_ptr) cinfo->marker; | |
jpeg_saved_marker_ptr cur_marker = marker->cur_marker; | |
unsigned int bytes_read, data_length; | |
JOCTET FAR * data; | |
INT32 length = 0; | |
INPUT_VARS(cinfo); | |
if (cur_marker == NULL) { | |
/* begin reading a marker */ | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
length -= 2; | |
if (length >= 0) { /* watch out for bogus length word */ | |
/* figure out how much we want to save */ | |
unsigned int limit; | |
if (cinfo->unread_marker == (int) M_COM) | |
limit = marker->length_limit_COM; | |
else | |
limit = marker->length_limit_APPn[cinfo->unread_marker - (int) M_APP0]; | |
if ((unsigned int) length < limit) | |
limit = (unsigned int) length; | |
/* allocate and initialize the marker item */ | |
cur_marker = (jpeg_saved_marker_ptr) | |
(*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, | |
SIZEOF(struct jpeg_marker_struct) + limit); | |
cur_marker->next = NULL; | |
cur_marker->marker = (UINT8) cinfo->unread_marker; | |
cur_marker->original_length = (unsigned int) length; | |
cur_marker->data_length = limit; | |
/* data area is just beyond the jpeg_marker_struct */ | |
data = cur_marker->data = (JOCTET FAR *) (cur_marker + 1); | |
marker->cur_marker = cur_marker; | |
marker->bytes_read = 0; | |
bytes_read = 0; | |
data_length = limit; | |
} else { | |
/* deal with bogus length word */ | |
bytes_read = data_length = 0; | |
data = NULL; | |
} | |
} else { | |
/* resume reading a marker */ | |
bytes_read = marker->bytes_read; | |
data_length = cur_marker->data_length; | |
data = cur_marker->data + bytes_read; | |
} | |
while (bytes_read < data_length) { | |
INPUT_SYNC(cinfo); /* move the restart point to here */ | |
marker->bytes_read = bytes_read; | |
/* If there's not at least one byte in buffer, suspend */ | |
MAKE_BYTE_AVAIL(cinfo, return FALSE); | |
/* Copy bytes with reasonable rapidity */ | |
while (bytes_read < data_length && bytes_in_buffer > 0) { | |
*data++ = *next_input_byte++; | |
bytes_in_buffer--; | |
bytes_read++; | |
} | |
} | |
/* Done reading what we want to read */ | |
if (cur_marker != NULL) { /* will be NULL if bogus length word */ | |
/* Add new marker to end of list */ | |
if (cinfo->marker_list == NULL) { | |
cinfo->marker_list = cur_marker; | |
} else { | |
jpeg_saved_marker_ptr prev = cinfo->marker_list; | |
while (prev->next != NULL) | |
prev = prev->next; | |
prev->next = cur_marker; | |
} | |
/* Reset pointer & calc remaining data length */ | |
data = cur_marker->data; | |
length = cur_marker->original_length - data_length; | |
} | |
/* Reset to initial state for next marker */ | |
marker->cur_marker = NULL; | |
/* Process the marker if interesting; else just make a generic trace msg */ | |
switch (cinfo->unread_marker) { | |
case M_APP0: | |
examine_app0(cinfo, data, data_length, length); | |
break; | |
case M_APP14: | |
examine_app14(cinfo, data, data_length, length); | |
break; | |
default: | |
TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, | |
(int) (data_length + length)); | |
break; | |
} | |
/* skip any remaining data -- could be lots */ | |
INPUT_SYNC(cinfo); /* do before skip_input_data */ | |
if (length > 0) | |
(*cinfo->src->skip_input_data) (cinfo, (long) length); | |
return TRUE; | |
} | |
#endif /* SAVE_MARKERS_SUPPORTED */ | |
METHODDEF(boolean) | |
skip_variable (j_decompress_ptr cinfo) | |
/* Skip over an unknown or uninteresting variable-length marker */ | |
{ | |
INT32 length; | |
INPUT_VARS(cinfo); | |
INPUT_2BYTES(cinfo, length, return FALSE); | |
length -= 2; | |
TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, (int) length); | |
INPUT_SYNC(cinfo); /* do before skip_input_data */ | |
if (length > 0) | |
(*cinfo->src->skip_input_data) (cinfo, (long) length); | |
return TRUE; | |
} | |
/* | |
* Find the next JPEG marker, save it in cinfo->unread_marker. | |
* Returns FALSE if had to suspend before reaching a marker; | |
* in that case cinfo->unread_marker is unchanged. | |
* | |
* Note that the result might not be a valid marker code, | |
* but it will never be 0 or FF. | |
*/ | |
LOCAL(boolean) | |
next_marker (j_decompress_ptr cinfo) | |
{ | |
int c; | |
INPUT_VARS(cinfo); | |
for (;;) { | |
INPUT_BYTE(cinfo, c, return FALSE); | |
/* Skip any non-FF bytes. | |
* This may look a bit inefficient, but it will not occur in a valid file. | |
* We sync after each discarded byte so that a suspending data source | |
* can discard the byte from its buffer. | |
*/ | |
while (c != 0xFF) { | |
cinfo->marker->discarded_bytes++; | |
INPUT_SYNC(cinfo); | |
INPUT_BYTE(cinfo, c, return FALSE); | |
} | |
/* This loop swallows any duplicate FF bytes. Extra FFs are legal as | |
* pad bytes, so don't count them in discarded_bytes. We assume there | |
* will not be so many consecutive FF bytes as to overflow a suspending | |
* data source's input buffer. | |
*/ | |
do { | |
INPUT_BYTE(cinfo, c, return FALSE); | |
} while (c == 0xFF); | |
if (c != 0) | |
break; /* found a valid marker, exit loop */ | |
/* Reach here if we found a stuffed-zero data sequence (FF/00). | |
* Discard it and loop back to try again. | |
*/ | |
cinfo->marker->discarded_bytes += 2; | |
INPUT_SYNC(cinfo); | |
} | |
if (cinfo->marker->discarded_bytes != 0) { | |
WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c); | |
cinfo->marker->discarded_bytes = 0; | |
} | |
cinfo->unread_marker = c; | |
INPUT_SYNC(cinfo); | |
return TRUE; | |
} | |
LOCAL(boolean) | |
first_marker (j_decompress_ptr cinfo) | |
/* Like next_marker, but used to obtain the initial SOI marker. */ | |
/* For this marker, we do not allow preceding garbage or fill; otherwise, | |
* we might well scan an entire input file before realizing it ain't JPEG. | |
* If an application wants to process non-JFIF files, it must seek to the | |
* SOI before calling the JPEG library. | |
*/ | |
{ | |
int c, c2; | |
INPUT_VARS(cinfo); | |
INPUT_BYTE(cinfo, c, return FALSE); | |
INPUT_BYTE(cinfo, c2, return FALSE); | |
if (c != 0xFF || c2 != (int) M_SOI) | |
ERREXIT2(cinfo, JERR_NO_SOI, c, c2); | |
cinfo->unread_marker = c2; | |
INPUT_SYNC(cinfo); | |
return TRUE; | |
} | |
/* | |
* Read markers until SOS or EOI. | |
* | |
* Returns same codes as are defined for jpeg_consume_input: | |
* JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI. | |
*/ | |
METHODDEF(int) | |
read_markers (j_decompress_ptr cinfo) | |
{ | |
/* Outer loop repeats once for each marker. */ | |
for (;;) { | |
/* Collect the marker proper, unless we already did. */ | |
/* NB: first_marker() enforces the requirement that SOI appear first. */ | |
if (cinfo->unread_marker == 0) { | |
if (! cinfo->marker->saw_SOI) { | |
if (! first_marker(cinfo)) | |
return JPEG_SUSPENDED; | |
} else { | |
if (! next_marker(cinfo)) | |
return JPEG_SUSPENDED; | |
} | |
} | |
/* At this point cinfo->unread_marker contains the marker code and the | |
* input point is just past the marker proper, but before any parameters. | |
* A suspension will cause us to return with this state still true. | |
*/ | |
switch (cinfo->unread_marker) { | |
case M_SOI: | |
if (! get_soi(cinfo)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_SOF0: /* Baseline */ | |
case M_SOF1: /* Extended sequential, Huffman */ | |
if (! get_sof(cinfo, FALSE, FALSE)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_SOF2: /* Progressive, Huffman */ | |
if (! get_sof(cinfo, TRUE, FALSE)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_SOF9: /* Extended sequential, arithmetic */ | |
if (! get_sof(cinfo, FALSE, TRUE)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_SOF10: /* Progressive, arithmetic */ | |
if (! get_sof(cinfo, TRUE, TRUE)) | |
return JPEG_SUSPENDED; | |
break; | |
/* Currently unsupported SOFn types */ | |
case M_SOF3: /* Lossless, Huffman */ | |
case M_SOF5: /* Differential sequential, Huffman */ | |
case M_SOF6: /* Differential progressive, Huffman */ | |
case M_SOF7: /* Differential lossless, Huffman */ | |
case M_JPG: /* Reserved for JPEG extensions */ | |
case M_SOF11: /* Lossless, arithmetic */ | |
case M_SOF13: /* Differential sequential, arithmetic */ | |
case M_SOF14: /* Differential progressive, arithmetic */ | |
case M_SOF15: /* Differential lossless, arithmetic */ | |
ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo->unread_marker); | |
break; | |
case M_SOS: | |
if (! get_sos(cinfo)) | |
return JPEG_SUSPENDED; | |
cinfo->unread_marker = 0; /* processed the marker */ | |
return JPEG_REACHED_SOS; | |
case M_EOI: | |
TRACEMS(cinfo, 1, JTRC_EOI); | |
cinfo->unread_marker = 0; /* processed the marker */ | |
return JPEG_REACHED_EOI; | |
case M_DAC: | |
if (! get_dac(cinfo)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_DHT: | |
if (! get_dht(cinfo)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_DQT: | |
if (! get_dqt(cinfo)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_DRI: | |
if (! get_dri(cinfo)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_APP0: | |
case M_APP1: | |
case M_APP2: | |
case M_APP3: | |
case M_APP4: | |
case M_APP5: | |
case M_APP6: | |
case M_APP7: | |
case M_APP8: | |
case M_APP9: | |
case M_APP10: | |
case M_APP11: | |
case M_APP12: | |
case M_APP13: | |
case M_APP14: | |
case M_APP15: | |
if (! (*((my_marker_ptr) cinfo->marker)->process_APPn[ | |
cinfo->unread_marker - (int) M_APP0]) (cinfo)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_COM: | |
if (! (*((my_marker_ptr) cinfo->marker)->process_COM) (cinfo)) | |
return JPEG_SUSPENDED; | |
break; | |
case M_RST0: /* these are all parameterless */ | |
case M_RST1: | |
case M_RST2: | |
case M_RST3: | |
case M_RST4: | |
case M_RST5: | |
case M_RST6: | |
case M_RST7: | |
case M_TEM: | |
TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo->unread_marker); | |
break; | |
case M_DNL: /* Ignore DNL ... perhaps the wrong thing */ | |
if (! skip_variable(cinfo)) | |
return JPEG_SUSPENDED; | |
break; | |
default: /* must be DHP, EXP, JPGn, or RESn */ | |
/* For now, we treat the reserved markers as fatal errors since they are | |
* likely to be used to signal incompatible JPEG Part 3 extensions. | |
* Once the JPEG 3 version-number marker is well defined, this code | |
* ought to change! | |
*/ | |
ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker); | |
break; | |
} | |
/* Successfully processed marker, so reset state variable */ | |
cinfo->unread_marker = 0; | |
} /* end loop */ | |
} | |
/* | |
* Read a restart marker, which is expected to appear next in the datastream; | |
* if the marker is not there, take appropriate recovery action. | |
* Returns FALSE if suspension is required. | |
* | |
* This is called by the entropy decoder after it has read an appropriate | |
* number of MCUs. cinfo->unread_marker may be nonzero if the entropy decoder | |
* has already read a marker from the data source. Under normal conditions | |
* cinfo->unread_marker will be reset to 0 before returning; if not reset, | |
* it holds a marker which the decoder will be unable to read past. | |
*/ | |
METHODDEF(boolean) | |
read_restart_marker (j_decompress_ptr cinfo) | |
{ | |
/* Obtain a marker unless we already did. */ | |
/* Note that next_marker will complain if it skips any data. */ | |
if (cinfo->unread_marker == 0) { | |
if (! next_marker(cinfo)) | |
return FALSE; | |
} | |
if (cinfo->unread_marker == | |
((int) M_RST0 + cinfo->marker->next_restart_num)) { | |
/* Normal case --- swallow the marker and let entropy decoder continue */ | |
TRACEMS1(cinfo, 3, JTRC_RST, cinfo->marker->next_restart_num); | |
cinfo->unread_marker = 0; | |
} else { | |
/* Uh-oh, the restart markers have been messed up. */ | |
/* Let the data source manager determine how to resync. */ | |
if (! (*cinfo->src->resync_to_restart) (cinfo, | |
cinfo->marker->next_restart_num)) | |
return FALSE; | |
} | |
/* Update next-restart state */ | |
cinfo->marker->next_restart_num = (cinfo->marker->next_restart_num + 1) & 7; | |
return TRUE; | |
} | |
/* | |
* This is the default resync_to_restart method for data source managers | |
* to use if they don't have any better approach. Some data source managers | |
* may be able to back up, or may have additional knowledge about the data | |
* which permits a more intelligent recovery strategy; such managers would | |
* presumably supply their own resync method. | |
* | |
* read_restart_marker calls resync_to_restart if it finds a marker other than | |
* the restart marker it was expecting. (This code is *not* used unless | |
* a nonzero restart interval has been declared.) cinfo->unread_marker is | |
* the marker code actually found (might be anything, except 0 or FF). | |
* The desired restart marker number (0..7) is passed as a parameter. | |
* This routine is supposed to apply whatever error recovery strategy seems | |
* appropriate in order to position the input stream to the next data segment. | |
* Note that cinfo->unread_marker is treated as a marker appearing before | |
* the current data-source input point; usually it should be reset to zero | |
* before returning. | |
* Returns FALSE if suspension is required. | |
* | |
* This implementation is substantially constrained by wanting to treat the | |
* input as a data stream; this means we can't back up. Therefore, we have | |
* only the following actions to work with: | |
* 1. Simply discard the marker and let the entropy decoder resume at next | |
* byte of file. | |
* 2. Read forward until we find another marker, discarding intervening | |
* data. (In theory we could look ahead within the current bufferload, | |
* without having to discard data if we don't find the desired marker. | |
* This idea is not implemented here, in part because it makes behavior | |
* dependent on buffer size and chance buffer-boundary positions.) | |
* 3. Leave the marker unread (by failing to zero cinfo->unread_marker). | |
* This will cause the entropy decoder to process an empty data segment, | |
* inserting dummy zeroes, and then we will reprocess the marker. | |
* | |
* #2 is appropriate if we think the desired marker lies ahead, while #3 is | |
* appropriate if the found marker is a future restart marker (indicating | |
* that we have missed the desired restart marker, probably because it got | |
* corrupted). | |
* We apply #2 or #3 if the found marker is a restart marker no more than | |
* two counts behind or ahead of the expected one. We also apply #2 if the | |
* found marker is not a legal JPEG marker code (it's certainly bogus data). | |
* If the found marker is a restart marker more than 2 counts away, we do #1 | |
* (too much risk that the marker is erroneous; with luck we will be able to | |
* resync at some future point). | |
* For any valid non-restart JPEG marker, we apply #3. This keeps us from | |
* overrunning the end of a scan. An implementation limited to single-scan | |
* files might find it better to apply #2 for markers other than EOI, since | |
* any other marker would have to be bogus data in that case. | |
*/ | |
GLOBAL(boolean) | |
jpeg_resync_to_restart (j_decompress_ptr cinfo, int desired) | |
{ | |
int marker = cinfo->unread_marker; | |
int action = 1; | |
/* Always put up a warning. */ | |
WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired); | |
/* Outer loop handles repeated decision after scanning forward. */ | |
for (;;) { | |
if (marker < (int) M_SOF0) | |
action = 2; /* invalid marker */ | |
else if (marker < (int) M_RST0 || marker > (int) M_RST7) | |
action = 3; /* valid non-restart marker */ | |
else { | |
if (marker == ((int) M_RST0 + ((desired+1) & 7)) || | |
marker == ((int) M_RST0 + ((desired+2) & 7))) | |
action = 3; /* one of the next two expected restarts */ | |
else if (marker == ((int) M_RST0 + ((desired-1) & 7)) || | |
marker == ((int) M_RST0 + ((desired-2) & 7))) | |
action = 2; /* a prior restart, so advance */ | |
else | |
action = 1; /* desired restart or too far away */ | |
} | |
TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action); | |
switch (action) { | |
case 1: | |
/* Discard marker and let entropy decoder resume processing. */ | |
cinfo->unread_marker = 0; | |
return TRUE; | |
case 2: | |
/* Scan to the next marker, and repeat the decision loop. */ | |
if (! next_marker(cinfo)) | |
return FALSE; | |
marker = cinfo->unread_marker; | |
break; | |
case 3: | |
/* Return without advancing past this marker. */ | |
/* Entropy decoder will be forced to process an empty segment. */ | |
return TRUE; | |
} | |
} /* end loop */ | |
} | |
/* | |
* Reset marker processing state to begin a fresh datastream. | |
*/ | |
METHODDEF(void) | |
reset_marker_reader (j_decompress_ptr cinfo) | |
{ | |
my_marker_ptr marker = (my_marker_ptr) cinfo->marker; | |
cinfo->comp_info = NULL; /* until allocated by get_sof */ | |
cinfo->input_scan_number = 0; /* no SOS seen yet */ | |
cinfo->unread_marker = 0; /* no pending marker */ | |
marker->pub.saw_SOI = FALSE; /* set internal state too */ | |
marker->pub.saw_SOF = FALSE; | |
marker->pub.discarded_bytes = 0; | |
marker->cur_marker = NULL; | |
} | |
/* | |
* Initialize the marker reader module. | |
* This is called only once, when the decompression object is created. | |
*/ | |
GLOBAL(void) | |
jinit_marker_reader (j_decompress_ptr cinfo) | |
{ | |
my_marker_ptr marker; | |
int i; | |
/* Create subobject in permanent pool */ | |
marker = (my_marker_ptr) | |
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, | |
SIZEOF(my_marker_reader)); | |
cinfo->marker = (struct jpeg_marker_reader *) marker; | |
/* Initialize public method pointers */ | |
marker->pub.reset_marker_reader = reset_marker_reader; | |
marker->pub.read_markers = read_markers; | |
marker->pub.read_restart_marker = read_restart_marker; | |
/* Initialize COM/APPn processing. | |
* By default, we examine and then discard APP0 and APP14, | |
* but simply discard COM and all other APPn. | |
*/ | |
marker->process_COM = skip_variable; | |
marker->length_limit_COM = 0; | |
for (i = 0; i < 16; i++) { | |
marker->process_APPn[i] = skip_variable; | |
marker->length_limit_APPn[i] = 0; | |
} | |
marker->process_APPn[0] = get_interesting_appn; | |
marker->process_APPn[14] = get_interesting_appn; | |
/* Reset marker processing state */ | |
reset_marker_reader(cinfo); | |
} | |
/* | |
* Control saving of COM and APPn markers into marker_list. | |
*/ | |
#ifdef SAVE_MARKERS_SUPPORTED | |
GLOBAL(void) | |
jpeg_save_markers (j_decompress_ptr cinfo, int marker_code, | |
unsigned int length_limit) | |
{ | |
my_marker_ptr marker = (my_marker_ptr) cinfo->marker; | |
long maxlength; | |
jpeg_marker_parser_method processor; | |
/* Length limit mustn't be larger than what we can allocate | |
* (should only be a concern in a 16-bit environment). | |
*/ | |
maxlength = cinfo->mem->max_alloc_chunk - SIZEOF(struct jpeg_marker_struct); | |
if (((long) length_limit) > maxlength) | |
length_limit = (unsigned int) maxlength; | |
/* Choose processor routine to use. | |
* APP0/APP14 have special requirements. | |
*/ | |
if (length_limit) { | |
processor = save_marker; | |
/* If saving APP0/APP14, save at least enough for our internal use. */ | |
if (marker_code == (int) M_APP0 && length_limit < APP0_DATA_LEN) | |
length_limit = APP0_DATA_LEN; | |
else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN) | |
length_limit = APP14_DATA_LEN; | |
} else { | |
processor = skip_variable; | |
/* If discarding APP0/APP14, use our regular on-the-fly processor. */ | |
if (marker_code == (int) M_APP0 || marker_code == (int) M_APP14) | |
processor = get_interesting_appn; | |
} | |
if (marker_code == (int) M_COM) { | |
marker->process_COM = processor; | |
marker->length_limit_COM = length_limit; | |
} else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) { | |
marker->process_APPn[marker_code - (int) M_APP0] = processor; | |
marker->length_limit_APPn[marker_code - (int) M_APP0] = length_limit; | |
} else | |
ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code); | |
} | |
#endif /* SAVE_MARKERS_SUPPORTED */ | |
/* | |
* Install a special processing method for COM or APPn markers. | |
*/ | |
GLOBAL(void) | |
jpeg_set_marker_processor (j_decompress_ptr cinfo, int marker_code, | |
jpeg_marker_parser_method routine) | |
{ | |
my_marker_ptr marker = (my_marker_ptr) cinfo->marker; | |
if (marker_code == (int) M_COM) | |
marker->process_COM = routine; | |
else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) | |
marker->process_APPn[marker_code - (int) M_APP0] = routine; | |
else | |
ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code); | |
} | |
#endif //_FX_JPEG_TURBO_ |